Mass distribution in the disintegration of heavy nuclei

Eren, N.; Buyukcizmeci, N.; Ogul, R.; Botvina, A. S.

doi:10.1140/epja/i2013-13048-1

Cited by 16 publications

(25 citation statements)

References 43 publications

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“…Their secondary decay includes evaporation, fission, and Fermi-break-up processes. The corresponding models are similar to those used for the description of low energy reactions [8,22,28]; they do account, however, for modifications of fragment properties under freeze-out conditions [29,30].…”

Section: Statistical Approach To Multifragmentationmentioning

confidence: 99%

Theoretical study of projectile fragmentation in theSn112+Sn112and<

et al. 2015

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We analyze the production cross sections and isotopic distributions of projectilelike residues in the reactions 112 Sn + 112 Sn and 124 Sn + 124 Sn at an incident beam energy of 1 GeV/nucleon measured with the fragment separator at the GSI laboratory. Calculations within the statistical multifragmentation model for an ensemble of excited sources were performed with ensemble parameters determined previously for similar reactions at 600 MeV/nucleon. The obtained good agreement with the experiment establishes the universal properties of the excited spectator systems produced during the dynamical stage of the reaction. It is furthermore confirmed that a significant reduction of the symmetry-energy term at the freeze-out stage of reduced density and high temperature is necessary to reproduce the experimental isotope distributions. A trend of decreasing symmetry energy for large neutron-rich fragments of low excitation energy is interpreted as a nuclear-structure effect.

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Section: Statistical Approach To Multifragmentationmentioning

confidence: 99%

Theoretical study of projectile fragmentation in theSn112+Sn112and<

et al. 2015

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“…8 and 9 we show the evolution of these mass distributions with excitation energy for fissioning 238 Λ U and 209 Λ Bi hypernuclei. As for the normal nuclear matter [18,37] the uranium fission leads to the mixture of the asymmetric and symmetric modes at low excitation energy [ Fig. 8(a)], which turn into the symmetric fission at more high excitations [ Figs.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

“…The kinetic energy of the hyper fission fragments is generated as for normal fragments [18,37] and depends only on their mass number and charge. After fission the separated fragments are still excited and evaporate few particles.…”

Section: B Sequential Decay Models: Evaporation and Fissionmentioning

confidence: 99%

“…Indeed, the time scales of less than 100 fm/c are extracted for multifragmentation reactions from experimental data [40,41]. There are many experimental and theoretical works demonstrating a smooth transition from evaporation and fission modes to the fast multifragmentation break up of the whole nuclei with increasing excitation energy above 3 MeV/nucleon [18,20,37,41,42,48,49]. This break up can be described by the statistical laws, in particular, the statistical multifragmentation model (SMM) [18], where the disintegration channels are generated according to their statistical weight.…”

Section: Evolution From Sequential Decay To Simultaneous Break Upmentioning

confidence: 99%

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Formation of hypernuclei in evaporation and fission processes

et al. 2016

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There are excellent opportunities to produce excited heavy hyper residues in relativistic hadron and peripheral heavy-ion collisions. We investigate the disintegration of such residues into hyper nuclei via evaporation of baryons and light clusters and their fission. Previously these processes were well known for normal nuclei as the decay channels at low excitation energies. We have generalized these models for the case of hyper-matter. In this way we make extension of nuclear reaction studies at low temperature into the strange sector. We demonstrate how the new decay channels can be integrated in the whole disintegration process. Their importance for mass and isotope distributions of produced hyper-fragments is emphasized. New and exotic isotopes obtained within these processes may provide a unique opportunity for investigating hyperon interaction in nuclear matter.Comment: 32 pages, 13 figures, accepted to Phys. Rev.

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“…To describe the de-excitation of the hot heavy quasiprojectiles emerging from the dynamical stage, we used the latest version of the Statistical Multifragmentation Model [47,48,[66][67][68]. The SMM model assumes statistical equilibrium at a low-density freeze-out stage and includes all breakup channels ranging from the compound nucleus to vaporization (i.e.…”

Section: Model For the De-excitation Stagementioning

confidence: 99%

Neutron-rich rare-isotope production from projectile fission of heavy nuclei near 20 MeV/nucleon beam energy

et al. 2016

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We investigate the possibilities of producing neutron-rich nuclides in projectile fission of heavy beams in the energy range of 20 MeV/nucleon expected from low-energy facilities. We report our efforts to theoretically describe the reaction mechanism of projectile fission following a multinucleon transfer collision at this energy range. Our calculations are mainly based on a two-step approach: the dynamical stage of the collision is described with either the phenomenological Deep-Inelastic Transfer model (DIT), or with the microscopic Constrained Molecular Dynamics model (CoMD). The deexcitation/fission of the hot heavy projectile fragments is performed with the Statistical Multifragmentation Model (SMM). We compared our model calculations with our previous experimental projectile-fission data of 238 U (20 MeV/nucleon)+ 208 Pb and 197 Au (20 MeV/nucleon)+ 197 Au and found an overall reasonable agreement. Our study suggests that projectile fission following peripheral heavy-ion collisions at this energy range offers an effective route to access very neutron-rich rare isotopes toward and beyond the astrophysical r-process path.

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Mass distribution in the disintegration of heavy nuclei

Cited by 16 publications

References 43 publications

Theoretical study of projectile fragmentation in theSn112+Sn112and<

Theoretical study of projectile fragmentation in theSn112+Sn112and<

Formation of hypernuclei in evaporation and fission processes

Neutron-rich rare-isotope production from projectile fission of heavy nuclei near 20 MeV/nucleon beam energy

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