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N. L. Calleya; S. R. Souza; B. V. Carlson; R. Donangelo; W. G. Lynch; M. B. Tsang; J. R. Winkelbauer
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The fragmentation of thermalized sources is studied using a version of the Statistical Multifragmentation Model which employs state densities that take the pairing gap in the nuclear levels into account. Attention is focused on the properties of the charge distributions observed in the breakup of the source. Since the microcanonical version of the model used in this study provides the primary fragment excitation energy distribution, one may correlate the reduction of the oddeven staggering in...
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1408.6810
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Z. Chajecki; M. Youngs; D. D. S. Coupland; W. G. Lynch; M. B. Tsang; D. Brown; A. Chbihi; P. Danielewicz; R. T. deSouza; M. A. Famiano; T. K. Ghosh; B. Giacherio; V. Henzl; D. Henzlova; C. Herlitzius; S. Hudan; M. A. Kilburn; Jenny Lee; F. Lu; S. Lukyanov; A. M. Rogers; P. Russotto; A. Sanetullaev; R. H. Showalter; L. G. Sobotka; Z. Y. Sun; A. M. Vander Molen; G. Verde; M. S. Wallace; J. Winkelbauer
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We show that ratios of lightparticle energy spectra display scaling properties that can be accu rately described by effective local chemical potentials. This demonstrates the equivalence of t/3He and n/p spectral ratios and provides an essential test of theoretical predictions of isotopically resolved lightparticle spectra. In addition, this approach allows direct comparisons of many theoretical n/p spectral ratios to experiments where chargedparticle spectra but not neutron spectra are...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1402.5216
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S. Hudan; R. Alfaro; B. Davin; Y. Larochelle; H. Xu; L. Beaulieu; T. Lefort; R. Yanez; R. T. de Souza; R. J. Charity; L. G. Sobotka; T. X. Liu; X. D. Liu; W. G. Lynch; R. Shomin; W. P. Tan; M. B. Tsang; A. Vander Molen; A. Wagner; H. F. Xi
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The characteristics of intermediate mass fragments (IMFs: 3
Source: http://arxiv.org/abs/nuclex/0501022v1
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P. Lasko; M. Adamczyk; J. Brzychczyk; P. Hirnyk; J. Łukasik; P. Pawłowski; K. Pelczar; A. Snoch; A. Sochocka; Z. Sosin; J. Barney; G. Cerizza; J. Estee; T. Isobe; G. Jhang; M. Kaneko; M. KurataNishimura; W. G. Lynch; T. Murakami; C. Santamaria; M. B. Tsang; Y. Zhang
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KATANA  the Krakow Array for Triggering with Amplitude discrimiNAtion  has been built and used as a trigger and veto detector for the S$\pi$RIT TPC at RIKEN. Its construction allows operating in magnetic field and providing fast response for ionizing particles, giving the approximate forward multiplicity and charge information. Depending on this information, trigger and veto signals are generated. The article presents performance of the detector and details of its construction. A simple...
Topics: Nuclear Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1610.06682
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S. Turbide; L. Beaulieu; P. Danielewicz; V. E. Viola; R. Roy; K. Kwiatkowski; W. C. Hsi; G. Wang; T. Lefort; D. S. Bracken; H. Breuer; E. Cornell; F. GimenoNogues; D. S. Ginger; S. Gushue; R. Huang; R. Korteling; W. G. Lynch; K. B. Morley; E. Ramakrishnan; L. P. Remsberg; D. Rowland; M. B. Tsang; H. Xi; S. J. Yennello
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Effects of inmedium crosssections and of optical potential on preequilibrium emission and on formation of a thermal source are investigated by comparing the results of transport simulations with experimental results from the p+{197}Au reaction at 6.214.6 GeV/c. The employed transport model includes light compositeparticle production and allows for inclusion of inmedium particleparticle crosssection reduction and of momentum dependence in the particle opticalpotentials. Compared to the...
Source: http://arxiv.org/abs/nuclth/0402071v1
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Akira Ono; P. Danielewicz; W. A. Friedman; W. G. Lynch; M. B. Tsang
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Isoscaling is found to hold for fragment yields in the antisymmetrized molecular dynamics (AMD) simulations for collisions of calcium isotopes at 35 MeV/nucleon. This suggests the applicability of statistical considerations to the dynamical fragment emission. The observed linear relationship between the isoscaling parameters and the isospin asymmetry of fragments supports the above suggestion. The slope of this linear function yields information about the symmetry energy in low density region...
Source: http://arxiv.org/abs/nuclth/0305038v1
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S. R. Souza; R. Donangelo; W. G. Lynch; W. P. Tan; M. B. Tsang
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We show that the qualitative behavior of the nuclear caloric curve can be inferred from the energy dependence of the isoscaling parameters. Since there are strong indications that the latter are not distorted by the secondary decay of primary hot fragments, in contrast to other observables, this suggests that valuable information on the nuclear caloric curve may be obtained through the analysis presented in this work.
Source: http://arxiv.org/abs/nuclth/0309063v1
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M. B. Tsang; Z. Chajecki; D. Coupland; P. Danielewicz; F. Famiano; R. Hodges; M. Kilburn; F. Lu; W. G. Lynch; J. Winkelbauer; M. Youngs; YingXun Zhang
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Constraints on the Equation of State for symmetric matter (equal neutron and proton numbers) have been extracted from energetic collisions of heavy ions over a range of energies. Collisions of neutrondeficient and neutronrich heavy ions now provide initial constraints on the EoS of neutronrich matter at subsaturation densities from isospin diffusions and neutron proton ratios. This article reviews the experimental constraints on the density dependence of Symmetry Energy at subsaturation...
Source: http://arxiv.org/abs/1101.3648v1
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S. R. Souza; M. B. Tsang; B. V. Carlson; R. Donangelo; W. G. Lynch; A. W. Steiner
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The properties of the nuclear isoscaling at finite temperature are investigated and the extent to which its parameter $\alpha$ holds information on the symmetry energy is examined. We show that, although finite temperature effects invalidate the analytical formulas that relate the isoscaling parameter $\alpha$ to those of the mass formula, the symmetry energy remains the main ingredient that dictates the behavior of $\alpha$ at finite temperatures, even for very different sources. This...
Source: http://arxiv.org/abs/0906.4375v2
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S. R. Souza; M. B. Tsang
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The properties of isobaric ratios, between nuclei produced in the same reaction, are investigated using the canonical and grandcanonical statistical ensembles. Although the grandcanonical for mulae furnish a means to correlate the ratios with the liquid drop parameters, finite size effects make it difficult to obtain their actual values from fitting nuclear collision data.
Source: http://arxiv.org/abs/1112.3631v1
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S. R. Souza; M. B. Tsang; R. Donangelo
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We investigate correlations in the fragment momentum distribution due to the propagation of fragments under the influence of their mutual Coulomb field, after the breakup of an excited nuclear source.The magnitude of the effects on the nuclear temperatures obtained from such distributions is estimated with the help of a simple approach in which a charged fragment interacts with a homogeneous charged sphere. The resuslts are used to correct the temperatures obtained from the asymptotic momentum...
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1704.05500
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S. Hudan; A. S. Botvina; R. Alfaro; L. Beaulieu; B. Davin; Y. Larochelle; T. Lefort; V. E. Viola; H. Xu; R. Yanez; R. T. de Souza; T. X. Liu; X. D. Liu; W. G. Lynch; R. Shomin; W. P. Tan; M. B. Tsang; A. Vander Molen; A. Wagner; H. F. Xi; R. J. Charity; L. G. Sobotka
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A new method to examine the time scale of particle emission from hot nuclei is explored. Excited projectilelike and targetlike fragments decay as they separate following a peripheral heavyion collision. Their mutual Coulomb influence results in an anisotropic angular distribution of emitted particles, providing a measure of the particle emission time scale. Predictions of a schematic evaporation model are presented and compared to experimental data.
Source: http://arxiv.org/abs/nuclex/0308031v2
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Yingxun Zhang; M. B. Tsang; Zhuxia Li
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Using covariance analysis, we quantify the correlations between the interaction parameters in a transport model and the observables commonly used to extract information of the Equation of State of Asymmetric Nuclear Matter in experiments. By simulating $^{124}$Sn+$^{124}$Sn, $^{124}$Sn+$^{112}$Sn and $^{112}$Sn+$^{112}$Sn reactions at beam energies of 50 and 120 MeV per nucleon, we have identified that the nucleon effective mass splitting are most strongly correlated to the neutrons and protons...
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1507.06718
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S. R. Souza; R. Donangelo; W. G. Lynch; M. B. Tsang
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We include in statistical model calculations the facts that in the nuclear multifragmentation process the fragments are produced within a given volume and have a finite size. The corrections associated with these constraints affect the partition modes and, as a consequence, other observables in the process. In particular, we find that the favored fragmenting modes strongly suppress the collective flow energy, leading to much lower values compared to what is obtained from unconstrained...
Source: http://arxiv.org/abs/0706.0467v1
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Yingxun Zhang; D. D. S. Coupland; P. Danielewicz; Zhuxia Li; Hang Liu; Fei Lu; W. G. Lynch; M. B. Tsang
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We explore the influence of inmedium nucleonnucleon cross section, symmetry potential and impact parameter on isospin sensitive observables in intermediateenergy heavyion collisions with the ImQMD05 code, a modified version of Quantum Molecular Dynamics model. At incident velocities above the Fermi velocity, we find that the density dependence of symmetry potential plays a more important role on the double neutron to proton ratio $DR(n/p)$ and the isospin transport ratio $R_i$ than the...
Source: http://arxiv.org/abs/1009.1928v2
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W. Trautmann; P. Adrich; T. Aumann; C. O. Bacri; T. Barczyk; R. Bassini; S. Bianchin; C. Boiano; A. S. Botvina; A. Boudard; J. Brzychczyk; A. Chbihi; J. Cibor; B. Czech; M. De Napoli; J. E. Ducret; H. Emling; J. D. Frankland; M. Hellstroem; D. Henzlova; G. Imme; I. Iori; H. Johansson; K. Kezzar; A. Lafriakh; A. Le Fevre; E. Le Gentil; Y. Leifels; J. Luehning; J. Lukasik; W. G. Lynch; U. Lynen; Z. Majka; M. Mocko; W. F. J. Mueller; A. Mykulyak; H. Orth; A. N. Otte; R. Palit; P. Pawlowski; A....
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The N/Z dependence of projectile fragmentation at relativistic energies has been studied in a recent experiment at the GSI laboratory with the ALADiN forward spectrometer coupled to the LAND neutron detector. Besides a primary beam of 124Sn, also secondary beams of 124La and 107Sn delivered by the FRS fragment separator have been used in order to extend the range of isotopic compositions of the produced spectator sources. With the achieved mass resolution of \Delta A/A \approx 1.5%, lighter...
Source: http://arxiv.org/abs/0711.4462v1
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M. B. Tsang; P. Danielewicz
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Arrheniustype plots for multifragmentation process, defined as the transverse energy dependence of the singlefragment emissionprobability, ln(p_{b}) vs 1/sqrt(E_{t}), have been studied by examining the relationship of the parameters p_{b} and E_{t} to the intermediatemass fragment multiplicity . The linearity of these plots reflects the correlation of the fragment multiplicity with the transverse energy. These plots may not provide thermal scaling information about fragment production as...
Source: http://arxiv.org/abs/nuclex/9704010v1
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S. R. Souza; M. B. Tsang; R. Donangelo; W. G. Lynch; A. W. Steiner
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Using different parameterizations of the nuclear mass formula, we study the sensitivity of the isoscaling parameters to the mass formula employed in grandcanonical calculations. Previous works on isoscaling have suggested that the symmetry energy implied in such calculations is anomalously smaller than that suggested by fits to nuclear masses. We show that surface corrections to the symmetry energy naturally broadens the isotopic distribution thus allowing for values of the symmetry energy...
Source: http://arxiv.org/abs/0804.1352v1
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S. Das Gupta; J. Pan; M. B. Tsang
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Determination of temperature from experimental data has become important in searches for critical phenomena in heavy ion collisions. Widely used methods are ratios of isotopes (which rely on chemical and thermal equilibrium), population ratios of excited states etc. Using the lattice gas model we propose a new observable: $n_{ch}/Z$ where $n_{ch}$ is the charge multiplicity and $Z$ is the charge of the fragmenting system. We show that the reduced multiplicity is a good measure of the average...
Source: http://arxiv.org/abs/nuclth/9609066v1
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S. R. Souza; B. V. Carlson; R. Donangelo; W. G. Lynch; M. B. Tsang
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The agreement between the fragments' internal and kinetic temperatures with the breakup temperature is investigated using a Statistical Multifragmentation Model which makes no a priori as sumption on the relationship between them. We thus examine the conditions for obtaining such agreement and find that, in the framework of our model, this holds only in a relatively narrow range of excitation energy. The role played by the qualitative shape of the fragments' state densities is also examined....
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1411.7646
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The ALADIN2000 Collaboration; C. Sfienti; P. Adrich; T. Aumann; C. O. Bacri; T. Barczyk; R. Bassini; S. Bianchin; C. Boiano; A. S. Botvina; A. Boudard; J. Brzychczyk; A. Chbihi; J. Cibor; B. Czech; M. De Napoli; J. E. Ducret; H. Emling; J. D. Frankland; M. Hellstroem; D. Henzlova; G. Imme; I. Iori; H. Johansson; K. Kezzar; A. Lafriakh; A. Le Fevre; E. Le Gentil; Y. Leifels; J. Luehning; J. Lukasik; W. G. Lynch; U. Lynen; Z. Majka; M. Mocko; W. F. J. Mueller; A. Mykulyak; H. Orth; A. N. Otte;...
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The A/Z dependence of projectile fragmentation at relativistic energies has been studied with the ALADIN forward spectrometer at SIS. A stable beam of 124Sn and radioactive beams of 124La and 107Sn at 600 MeV per nucleon have been used in order to explore a wide range of isotopic compositions. Chemical freezeout temperatures are found to be nearly invariant with respect to the A/Z of the produced spectator sources, consistent with predictions for expanded systems. Small Coulomb effects (\Delta...
Source: http://arxiv.org/abs/0903.1772v1
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M. Mocko; M. B. Tsang; D. Lacroix; A. Ono; P. Danielewicz; W. G. Lynch; R. J. Charity
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The collisions in four different reaction systems using $^{40,48}$Ca and $^{58,64}$Ni isotope beams and a Be target have been simulated using the Heavy Ion Phase Space Exploration and the Antisymmetrized Molecular Dynamics models. The present study mainly focuses on the model predictions for the excitation energies of the hot fragments and the cross sections of the final fragments produced in these reactions. The effects of various factors influencing the final fragment cross sections, such as...
Source: http://arxiv.org/abs/0804.2603v2
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D. D. S. Coupland; W. G. Lynch; M. B. Tsang; P. Danielewicz; Yingxun Zhang
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The symmetry energy in the nuclear equation of state affects many aspects of nuclear astrophysics, nuclear structure, and nuclear reactions. Recent constraints from heavy ion collisions, including isospin diffusion observables, have started to put constraints on the symmetry energy below nuclear saturation density, but these constraints depend on the employed transport model and input physics other than the symmetry energy. To understand these dependencies, we study the influence of the...
Source: http://arxiv.org/abs/1107.3709v1
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A M Rogers; W G Lynch; M A Famiano; M S Wallace; F Amorini; D Bazin; R J Charity; F Delaunay; R T de Souza; J Elson; A Gade; D Galaviz; S Hudan; J Lee; S Lobostov; S Lukyanov; M Matos; M Mocko; M B Tsang; D Shapira; L G Sobotka; G Verde
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The first direct measurement of the proton separation energy, Sp, for the protonunbound nucleus 69Br is reported. Of interest is the exponential dependence of the 2pcapture rate on Sp which can bypass the 68Se waitingpoint in the astrophysical rp process. An analysis of the observed proton decay spectrum is given in terms of the 69Se mirror nucleus and the influence of Sp is explored within the context of a singlezone Xray burst model.
Source: http://arxiv.org/abs/1009.2950v1
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C. B. Das; S. Das Gupta; X. D. Liu; M. B. Tsang
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Calculations for a set of nuclear multifragmentation data are made using a Canonical and a Grand Canonical Model. The physics assumptions are identical but the Canonical Model has an exact number of particles, whereas, the Grand Canonical Model has a varying number of particles, hence, is less exact. Interesting differences are found.
Source: http://arxiv.org/abs/nuclth/0106019v1
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D. D. S. Coupland; M. Youngs; W. G. Lynch; M. B. Tsang; Z. Chajecki; Y. X. Zhang; M. A. Famiano; T. K. Ghosh; B. Giacherio; M. A. Kilburn; Jenny Lee; F. Lu; P. Russotto; A. Sanetullaev; R. H. Showalter; G. Verde; J. Winkelbauer
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We probe the momentum dependence of the isovector meanfield potential by comparing the energy spectra of neutrons and protons emitted in $^{112}$Sn+$^{112}$Sn and $^{124}$Sn+$^{124}$Sn collisions at incident energies of E/A=50 and 120 MeV. We achieve experimental precision that discriminates between different momentum dependencies for the symmetry meanfield potential. Comparisons of the experimental results to Improved Quantum Molecular Dynamics model calculations with Skyrme Interactions...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1406.4546
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D. Bazin; R. J. Charity; R. T. de Souza; M. A. Famiano; A. Gade; V. Henzl; D. Henzlova; S. Hudan; J. Lee; S. Lukyanov; W. G. Lynch; S. McDaniel; M. Mocko; A. Obertelli; A. M. Rogers; L. G. Sobotka; J. R. Terry; J. A. Tostevin; M. B. Tsang; M. S. Wallace
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We report on the first detailed study of the mechanisms involved in knockout reactions, via a coincidence measurement of the residue and fast proton in oneproton knockout reactions, using the S800 spectrograph in combination with the HiRA detector array at the NSCL. Results on the reactions $^9$Be($^9$C,$^8$B+X)Y and $^9$Be($^8$B,$^7$Be+X)Y are presented. They are compared with theoretical predictions for both the diffraction and stripping reaction mechanisms, as calculated in the eikonal...
Source: http://arxiv.org/abs/0902.2747v1
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H. Xu; R. Alfaro; B. Davin; L. Beaulieu; Y. Larochelle; T. Lefort; R. Yanez; R. T. de Souza; T. X. Liu; X. D. Liu; W. G. Lynch; R. Shomin; W. P. Tan; M. B. Tsang; A. Vander Molen; A. Wagner; H. F. Xi; C. K. Gelbke; R. J. Charity; L. G. Sobotka; A. S. Botvina
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Isotope ratios of fragments produced at midrapidity in peripheral and central collisions of 114Cd ions with 92Mo and 98Mo target nuclei at E/A = 50 MeV are compared. Neutronrich isotopes are preferentially produced in central collisions as compared to peripheral collisions. The influence of the size (A), density, N/Z, E*/A, and Eflow/A of the emitting source on the measured isotope ratios was explored by comparison with a statistical model (SMM). The midrapidity region associated with...
Source: http://arxiv.org/abs/nuclex/0107012v1
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M. A. Famiano; T. Liu; W. G. Lynch; M. Mocko; A. M. Rogers; M. B. Tsang; M. S. Wallace; R. J. Charity; S. Komarov; D. G. Sarantites; L. G. Sobotka; G. Verde
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Recent measurements of preequilibrium neutron and proton transverse emission from (112,124)Sn+(112,124)Sn reactions at 50 MeV/A have been completed at the National Superconducting Cyclotron Laboratory. Free nucleon transverse emission ratios are compared to those of A=3 mirror nuclei. Comparisons are made to BUU transport calculations and conclusions concerning the density dependence of the asymmetry term of the nuclear equationofstate at subnuclear densities are made. The doubleratio of...
Source: http://arxiv.org/abs/nuclex/0607016v2
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J. Lukasik; P. Adrich; T. Aumann; C. O. Bacri; T. Barczyk; R. Bassini; S. Bianchin; C. Boiano; A. S. Botvina; A. Boudard; J. Brzychczyk; A. Chbihi; J. Cibor; B. Czech; J. E. Ducret; H. Emling; J. Frankland; M. Hellstroem; D. Henzlova; G. Imme; I. Iori; H. Johansson; K. Kezzar; A. Lafriakh; A. Le Fevre; E. Le Gentil; Y. Leifels; J. Luehning; W. G. Lynch; U. Lynen; Z. Majka; M. Mocko; W. F. J. Mueller; A. Mykulyak; M. De Napoli; H. Orth; A. N. Otte; R. Palit; P. Pawlowski; A. Pullia; G. Raciti;...
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The discriminantanalysis method has been applied to optimize the exoticbeam charge recognition in a projectile fragmentation experiment. The experiment was carried out at the GSI using the fragment separator (FRS) to produce and select the relativistic secondary beams, and the ALADIN setup to measure their fragmentation products following collisions with Sn target nuclei. The beams of neutron poor isotopes around 124La and 107Sn were selected to study the isospin dependence of the limiting...
Source: http://arxiv.org/abs/0707.0598v1
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M. B. Tsang; W. G. Lynch; W. A. Friedman; M. Mocko; Z. Y. Sun; N. Aoi; J. M. Cook; F. Delaunay; M. A. Famiano; H. Hui; N. Imai; H. Iwasaki; T. Motobayashi; M. Niikura; T. Onishi; A. M. Rogers; H. Sakurai; H. Suzuki; E. Takeshita; S. Takeuchi; M. S. Wallace
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An exponential dependence of the fragmentation crosssection on the average binding energy is observed and reproduced with a statistical model. The observed functional dependence is robust and allows the extraction of binding energies from measured crosssections. From the systematics of 75,77,78,79Cu isotope crosssections have been extracted. They are 636.94 +/ 0.40 MeV, 647.1 +/ 0.4 MeV, 651.6 +/ 0.4 MeV and 657.8 +/ 0.5 MeV, respectively. Specifically, the uncertainty of the binding...
Source: http://arxiv.org/abs/0709.2177v1
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M. D'Agostino; A. S. Botvina; P. M. Milazzo; M. Bruno; G. J. Kunde; D. R. Bowman; L. Celano; N. Colonna; J. D. Dinius; A. Ferrero; M. L. Fiandri; C. K. Gelbke; T. Glasmacher; F. Gramegna; D. O. Handzy; D. Horn; W. C. Hsi; M. Huang; I. Iori; M. A. Lisa; W. G. Lynch; L. Manduci; G. V. Margagliotti; P. F. Mastinu; I. N. Mishustin; C. P. Montoya; A. Moroni; G. F. Peaslee; F. Petruzzelli; L. Phair; R. Rui; C. Schwarz; M. B. Tsang; G. Vannini; C. Williams
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Multifragment disintegrations, measured for central Au + Au collisions at E/A = 35 MeV, are analyzed with the Statistical Multifragmentation Model. Charge distributions, mean fragment energies, and twofragment correlation functions are well reproduced by the statistical breakup of a large, diluted and thermalized system slightly above the multifragmentation threshold.
Source: http://arxiv.org/abs/nuclex/9512003v2
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M. B. Tsang; W. A. Friedman; C. K. Gelbke; W. G. Lynch; G. Verde; H. S. Xu
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Isoscaling, where ratios of isotopes emitted from two reactions exhibit an exponential dependence on the neutron and proton number of the isotope, has been observed over a variety of reactions including evaporation, strongly damped binary collision, and multifragmentation. The conditions for isoscaling to occur as well as the conditions when isoscaling fails are investigated.
Source: http://arxiv.org/abs/nuclex/0106009v1
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M. B. Tsang; W. A. Friedman; C. K. Gelbke; W. G. Lynch; G. Verde; H. Xu
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A three parameter scaling relationship between isotopic distributions for elements with Z$\leq 8$ has been observed that allows a simple description of the dependence of such distributions on the overall isospin of the system. This scaling law (termed isoscaling) applies for a variety of reaction mechanisms that are dominated by phase space, including evaporation, multifragmentation and deeply inelastic scattering. The origins of this scaling behavior for the various reaction mechanisms are...
Source: http://arxiv.org/abs/nuclex/0103010v1
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M. B. Tsang; R. Bougault; R. Charity; D. Durand; W. A. Friedman; F. Gulminelli; A. Le Fevre; Al. H. Raduta; Ad. R. Raduta; S. Souza; W. Trautmann; R. Wada
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The results from ten statistical multifragmentation models have been compared with each other using selected experimental observables. Even though details in any single observable may differ, the general trends among models are similar. Thus these models and similar ones are very good in providing important physics insights especially for general properties of the primary fragments and the multifragmentation process. Mean values and ratios of observables are also less sensitive to individual...
Source: http://arxiv.org/abs/nuclex/0610005v1
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S. R. Souza; W. P. Tan; R. Donangelo; C. K. Gelbke; W. G. Lynch; M. B. Tsang
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We discuss different aspects which could influence temperatures deduced from experimental isotopic yields in the multifragmentation process. It is shown that fluctuations due to the finite size of the system and distortions due to the decay of hot primary fragments conspire to blur the temperature determination in multifragmentation reactions. These facts suggest that caloric curves obtained through isotope thermometers, which were taken as evidence for a firstorder phase transition in nuclear...
Source: http://arxiv.org/abs/nuclth/0005030v3
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A. B. McIntosh; S. Hudan; C. J. Metelko; R. T. de Souza; R. J. Charity; L. G. Sobotka; W. G. Lynch; M. B. Tsang
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We examine the decay of the 3.03 MeV state of $^8$Be evaporated from an excited projectilelike fragment following a peripheral heavyion collision. The relative energy of the daughter $\alpha$ particles exhibits a dependence on the decay angle of the $^8$Be$^*$, indicative of a tidal effect. Comparison of the measured tidal effect with a purely Coulomb model suggests the influence of a measurable nuclear proximity interaction.
Source: http://arxiv.org/abs/nuclex/0607028v1
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W. P. Tan; S. R. Souza; R. J. Charity; R. Donangelo; W. G. Lynch; M. B. Tsang
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We develop an improved Statistical Multifragmentation Model that provides the capability to calculate calorimetric and isotopic observables with precision. With this new model we examine the influence of nuclear isospin on the fragment elemental and isotopic distributions. We show that the proposed improvements on the model are essential for studying isospin effects in nuclear multifragmentation. In particular, these calculations show that accurate comparisons to experimental data require that...
Source: http://arxiv.org/abs/nuclex/0311001v1
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B. V. Carlson; R. Donangelo; S. R. Souza; W. G. Lynch; A. W. Steiner; M. B. Tsang
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We demonstrate the close similarity of a generalized Fermi breakup model, in which densities of excited states are taken into account, to the microcanonical statistical multifragmentation model used to describe the desintegration of highly excited fragments of nuclear reactions.
Source: http://arxiv.org/abs/1001.1306v1
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J. R. Winkelbauer; S. R. Souza; M. B. Tsang
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OddEven Staggering (OES) appears in many areas of nuclear physics, and is generally associated with the pairing term in the nuclear binding energy. To explore this effect, we use the Improved Statistical Multifragmentation Model to populate an ensemble of hot primary fragments, which are then deexcited using the WeisskopfEwing statistical emission formalism. The yields are then compared to experimental data. Our results show that, before secondary decay, OES appears only in the yields of...
Source: http://arxiv.org/abs/1303.1160v2
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W. A. Friedman; M. B. Tsang
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A method is proposed for the experimental measurement of neutron separation energies for nuclei far from stability. The procedure is based on determining cross sections for the production of nuclei, by projectile fragmentation, for which only protons are removed but for which the number of neutrons is left unchanged. A simple AbrasionAblation analysis leads to a cross section prediction which is sensitive to the neutron separation energy after a single parameter is adjusted in comparison with...
Source: http://arxiv.org/abs/nuclex/0302030v1
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P. Russotto; M. Chartier; E. De Filippo; A. Le Févre; S. Gannon; I. Gašparić; M. Kiš; S. Kupny; Y. Leifels; R. C. Lemmon; J. Łukasik; P. Marini; A. Pagano; P. Pawłowski; S. Santoro; W. Trautmann; M. Veselsky; L. Acosta; M. Adamczyk; A. AlAjlan; M. AlGarawi; S. AlHomaidhi; F. Amorini; L. Auditore; T. Aumann; Y. Ayyad; V. Baran; Z. Basrak; J. Benlliure; C. Boiano; M. Boisjoli; K. Boretzky; J. Brzychczyk; A. Budzanowski; G. Cardella; P. Cammarata; Z. Chajecki; A. Chbihi; M. Colonna; D....
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The ellipticflow ratio of neutrons with respect to protons in reactions of neutron rich heavyions systems at intermediate energies has been proposed as an observable sensitive to the strength of the symmetry term in the nuclear Equation Of State (EOS) at suprasaturation densities. The recent results obtained from the existing FOPI/LAND data for $^{197}$Au+$^{197}$Au collisions at 400 MeV/nucleon in comparison with the UrQMD model allowed a first estimate of the symmetry term of the EOS but...
Source: http://arxiv.org/abs/1209.5961v1
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P. F. Mastinu; M. Belkacem; D. R. Bowman; M. Bruno; M. D'Agostino; J. D. Dinius; A. Ferrero; M. L. Fiandri; C. K. Gelbke; T. Glasmacher; F. Gramegna; D. O. Handzy; D. Horn; W. C. Hsi; M. Huang; I. Iori; G. J. Kunde; M. A. Lisa; W. G. Lynch; G. V. Margagliotti; P. M. Milazzo; C. P. Montoya; A. Moroni; G. F. Peaslee; F. Petruzzelli; R. Rui; C. Schwarz; M. B. Tsang; G. Vannini; C. Williams; V. Latora; A. Bonasera
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Multifragment events resulting from peripheral Au + Au collisions at 35 MeV/nucleon are analysed in terms of critical behavior. The analysis of most of criticality signals proposed so far (conditional moments of charge distributions, Campi scatter plot, fluctuations of the size of the largest fragment, intermittency analysis) is consistent with the occurrence of a critical behavior of the system.
Source: http://arxiv.org/abs/nuclex/9604001v1
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S. R. Souza; B. V. Carlson; R. Donangelo; W. G. Lynch; A. W. Steiner; M. B. Tsang
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The Statistical Multifragmentation Model is modified to incorporate the Helmholtz free energies calculated in the finite temperature ThomasFermi approximation using Skyrme effective interactions. In this formulation, the density of the fragments at the freezeout configuration corresponds to the equilibrium value obtained in the ThomasFermi approximation at the given temperature. The behavior of the nuclear caloric curve at constant volume is investigated in the microcanonical ensemble and a...
Source: http://arxiv.org/abs/0901.2985v1
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M. Mocko; M. B. Tsang; Z. Y. Sun; N. Aoi; J. Cook; F. Delaunay; M. A. Famiano; H. Hui; N. Imai; H. Iwasaki; W. G. Lynch; T. Motobayashi; M. Niikura; T. Onishi; A. M. Rogers; H. Sakurai; A. Stolz; H. Suzuki; E. Takeshita; S. Takeuchi; M. S. Wallace
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We measured fragmentation cross sections produced using the primary beam of $^{86}$Kr at 64 MeV/nucleon on $^9$Be and $^{181}$Ta targets. The cross sections were obtained by integrating the momentum distributions of isotopes with 25
Source: http://arxiv.org/abs/0705.4313v2
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F. Delaunay; F. M. Nunes; W. G. Lynch; M. B. Tsang
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Coupled channels calculations are performed for the 12C(d,p)13C and 13C(p,d)12C reactions between 7 and 60 MeV to study the effect of inelastic couplings in transfer reactions. The effect of treating transfer beyond Born approximation is also addressed. The coupling to the 12C 2+ state is found to change the peak crosssection by up to 15 %. Effects beyond Born approximation lead to a significant renormalization of the crosssections, between 5 and 10 % for deuteron energies above 10 MeV, and...
Source: http://arxiv.org/abs/nuclth/0504045v1
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R. Ogul; A. S. Botvina; U. Atav; N. Buyukcizmeci; I. N. Mishustin; P. Adrich; T. Aumann; C. O. Bacri; T. Barczyk; R. Bassini; S. Bianchin; C. Boiano; A. Boudard; J. Brzychczyk; A. Chbihi; J. Cibor; B. Czech; M. De Napoli; J. E. Ducret; H. Emling; J. D. Frankland; M. Hellstrom; D. Henzlova; G. Imme; I. Iori; H. Johansson; K. Kezzar; A. Lafriakh; A. Le Fevre; E. Le Gentil; Y. Leifels; J. Luhning; J. Lukasik; W. G. Lynch; U. Lynen; Z. Majka; M. Mocko; W. F. J. Muller; A. Mykulyak; H. Orth; A. N....
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The N/Z dependence of projectile fragmentation at relativistic energies has been studied with the ALADIN forward spectrometer at the GSI Schwerionen Synchrotron (SIS). Stable and radioactive Sn and La beams with an incident energy of 600 MeV per nucleon have been used in order to explore a wide range of isotopic compositions. For the interpretation of the data, calculations with the statistical multifragmentation model for a properly chosen ensemble of excited sources were performed. The...
Source: http://arxiv.org/abs/1006.3723v2
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C. J. Horowitz; E. F. Brown; Y. Kim; W. G. Lynch; R. Michaels; A. Ono; J. Piekarewicz; M. B. Tsang; H. H. Wolter
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The symmetry energy describes how the energy of nuclear matter rises as one goes away from equal numbers of neutrons and protons. This is very important to describe neutron rich matter in astrophysics. This article reviews our knowledge of the symmetry energy from theoretical calculations, nuclear structure measurements, heavy ion collisions, and astronomical observations. We then present a roadmap to make progress in areas of relevance to the symmetry energy that promotes collaboration between...
Topics: High Energy Astrophysical Phenomena, Astrophysics, Nuclear Theory, Nuclear Experiment
Source: http://arxiv.org/abs/1401.5839
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K. W Brown; R. J. Charity; L. G. Sobotka; Z. Chajecki; L. V. Grigorenko; I. A. Egorova; Yu. L. Parfenova; M. V. Zhukov; S. Bedoor; W. W. Buhro; J. M. Elson; W. G. Lynch; J. Manfredi; D. G. McNeel; W. Reviol; R. Shane; R. H. Showalter; M. B. Tsang; J. R. Winkelbauer; A. H. Wuosmaa
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The interaction of an $E/A$=57.6MeV $^{17}$Ne beam with a Be target was used to populate levels in $^{16}$Ne following neutron knockout reactions. The decay of $^{16}$Ne states into the threebody $^{14}$O+$p$+$p$ continuum was observed in the High Resolution Array (HiRA). For the first time for a 2p emitter, correlations between the momenta of the three decay products were measured with sufficient resolution and statistics to allow for an unambiguous demonstration of their dependence on the...
Topics: Nuclear Experiment, Nuclear Theory
Source: http://arxiv.org/abs/1406.3285
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V. Henzl; M. A. Kilburn; Z. Chajecki; D. Henzlova; W. G. Lynch; D. Brown; A. Chbihi; D. Coupland; P. Danielewicz; R. deSouza; M. Famiano; C. Herlitzius; S. Hudan; Jenny Lee; S. Lukyanov; A. M. Rogers; A. Sanetullaev; L. Sobotka; Z. Y. Sun; M. B. Tsang; A. Vander Molen; G. Verde; M. Wallace; M. Youngs
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The angular dependence of protonproton correlation functions is studied in central $^{40}Ca+^{40}Ca$ and $^{48}Ca+^{48}Ca$ nuclear reactions at E=80 MeV/A. Measurements were performed with the HiRA detector complemented by the 4$\pi$ Array at NSCL. A striking angular dependence in the laboratory frame is found within pp correlation functions for both systems that greatly exceeds the measured and expected isospin dependent difference between the neutronrich and neutrondeficient systems....
Source: http://arxiv.org/abs/1108.2552v1