60 research outputs found
Mass distributions for nuclear disintegration from fission to evaporation
By a proper choice of the excitation energy per nucleon we analyze the mass
distributions of the nuclear fragmentation at various excitation energies.
Starting from low energies (between 0.1 and 1 MeV/nucleon) up to higher
energies about 12 MeV/n, we classified the mass yield characteristics for heavy
nuclei (A>200) on the basis of Statistical Multifragmentation Model. The
evaluation of fragment distribution with the excitation energy show that the
present results exhibit the same trend as the experimental ones.Comment: 5 pages, 3 figure
Nucleosynthesis of light nuclei and hypernuclei in central Au+Au collisions at =3 GeV
We analyze the experimental data on nuclei and hypernuclei yields recently
obtained by the STAR collaboration. The hybrid dynamical and statistical
approaches which have been developed previously are able to describe the
experimental data reasonably. We discuss the intriguing difference between the
yields of normal nuclei and hypernuclei which may be related to the properties
of hypermatter at subnuclear densities. Most importantly new (hyper-)nuclei
could be detected via particle correlations, and such measurements are relevant
to pin down the production mechanism.Comment: 7 pages, 6 figure
Modification of surface energy in nuclear multifragmentation
Within the statistical multifragmentation model we study modifications of the
surface and symmetry energy of primary fragments in the freeze-out volume. The
ALADIN experimental data on multifragmentation obtained in reactions induced by
high-energy projectiles with different neutron richness are analyzed. We have
extracted the isospin dependence of the surface energy coefficient at different
degrees of fragmentation. We conclude that the surface energy of hot fragments
produced in multifragmentation reactions differs from the values extracted for
isolated nuclei at low excitation. At high fragment multiplicity, it becomes
nearly independent of the neutron content of the fragments.Comment: 11 pages with 13 figure
Evolution of the statistical disintegration of finite nuclei toward high energy
We develop a statistical approach for the description of complex nuclei
formation from dynamically produced baryons in high energy heavy-ion reactions.
We consider a finite highly-excited expanding nuclear system formed after
central nucleus-nucleus collisions. This system is sub-divided into primary
equilibrated nucleon clusters. The final nuclei are produced after the decay of
these excited clusters. By the successful comparison with the FOPI experimental
data we prove the possibility of such a local equilibrium in nuclear matter
with the temperature corresponding to the phase coexistence region. The
regularities obtained in this new nuclei production mechanism are shown.Comment: 13 pages, 12 figures, to be submitted to Phys. Rev. C 2022. arXiv
admin note: text overlap with arXiv:2012.0767
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