Mass-split dependence of the pre- and post-scission neutron multiplicities for fission of 251Es

Hinde, David; Leigh, J.R.; Bokhorst, J.J.M.; Newton, J.O.; Walsh, R.L.; Boldeman, J.W.

doi:10.1016/0375-9474(87)90213-2

Cited by 99 publications

(71 citation statements)

References 23 publications

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“…As shown in figure 9, we also note that the mean values of the velocity of the IMF in the centre of mass frame show a quasi-linear decrease with the increase of the atomic number and they are well reproduced by the prediction of the fission systematic of Viola, with the Hinde's correction for the asymmetric process [16]. …”

Section: Kinematical Featuressupporting

confidence: 74%

Isospin influence on the decay modes of compound systems produced in the^78,86Kr +^40,48Ca at 10 AMeV

Pirrone

Politi

Wieleczko

et al. 2016

EPJ Web of Conferences

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Abstract. The study of the decay modes competition of the compound systems produced in the collisions 78 Kr+ 40 Ca and 86 Kr+ 48 Ca at 10AMeV is presented. In particular, the N/Z entrance channel influence on the decay paths of the compound systems, directly connected to the isospin influence, is investigated. The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) in Catania by using the 4π multi-detector CHIMERA. Charge, mass, angular distributions and kinematical features of the reaction products were studied. The analysis shows some differences in the contribution arising from the various reaction mechanisms for the neutron poor and neutron rich systems. Comparison with theoretical statistical and dynamical models are presented for the two systems. Besides a study of the influence of the energy on the entrance channel is performed for the 78 Kr+ 40 Ca reaction, by comparing the results of this experiment to those obtained for the same system at 5.5 AMeV with the INDRA device at GANIL.

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Section: Kinematical Featuressupporting

confidence: 74%

Isospin influence on the decay modes of compound systems produced in the^78,86Kr +^40,48Ca at 10 AMeV

Pirrone

Politi

Wieleczko

et al. 2016

EPJ Web of Conferences

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“…This is compared with the relative velocity reached in a pure Coulomb-driven separation, signature of a statistical fission process of a compound P LF * or T LF * system, as provided by the Viola systematics [210,211]:…”

Section: Analysis Of Kinematical Observablesmentioning

confidence: 99%

Reaction dynamics with exotic nuclei

et al. 2005

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Iste magistrorum locus est simul et puerorum, mittunt quando volunt hic res quas perdere nolunt [1]. AbstractWe review the new possibilities offered by the reaction dynamics of asymmetric heavy ion collisions, using stable and unstable beams. We show that it represents a rather unique tool to probe regions of highly Asymmetric Nuclear Matter (AN M ) in compressed as well as dilute phases, and to test the in-medium isovector interaction for high momentum nucleons. The focus is on a detailed study of the symmetry term of the nuclear Equation of State (EOS) in regions far away from saturation conditions but always under laboratory controlled conditions. Thermodynamic properties of AN M are surveyed starting from nonrelativistic and relativistic effective interactions. In the relativistic case the role of the isovector scalar δ-meson is stressed. The qualitative new features of the liquid-gas phase transition, "diffusive" instability and isospin distillation, are discussed. The results of ab-initio simulations of n-rich, n-poor, heavy ion collisions, using stochastic isospin dependent transport equations, are analysed as a function of beam energy and centrality. The isospin dynamics plays an important role in all steps of the reaction, from prompt nucleon emissions to the final fragments. The isospin diffusion is also of large interest, due to the interplay of asymmetry and density gradients. In relativistic collisions, the possibility of a direct study of the covariant structure of the effective nucleon interaction is shown. Results are discussed for particle production, collective flows and iso-transparency.Perspectives of further developments of the field, in theory as well as in experiment, are presented.

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“…For each splitting, the two fissioning fragments were separated by a distance d ij = r 0 (A 1/3 i + A 1/3 j ) with r 0 = 1.4 fm. This value of r 0 is voluntarily much smaller than that expected for fission (r 0 ∼ 1.9 fm [37,38]) in order to test the method in a non-ideal case. We used a typical inter-splitting time of 300 fm/c (see Fig.11).…”

Section: Discussionmentioning

confidence: 96%

“…As mentioned above, three sequences of splittings have to be considered. In each possible sequence, one pair of fragments is the result of the second splitting, and should therefore have a relative velocity close to that expected for fission [37,38]. Therefore, to identify the sequence of splittings event by event, we need only to find the pair with the most fission-like relative velocity and we trivially deduce that the remaining fragment resulted from the first step.…”

Section: B Sequence Of Splittingsmentioning

confidence: 99%

“…To translate δv in terms of inter-splitting time δt, we performed Coulomb trajectory calculations for point charges, which simulate sequential break-ups using mean charges given in Tab.I. The initial conditions of the calculation were chosen in order to reproduce the systematics of asymmetric fission [38]: for each step the two fissioning fragments were separated by a distance Fig.10.…”

Section: Inter-splitting Timementioning

confidence: 99%

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Coulomb chronometry to probe the decay mechanism of hot nuclei

et al. 2015

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In129 Xe+ nat Sn central collisions from 8 to 25 MeV/A, the three-fragment exit channel occurs with a significant cross section. We show that these fragments arise from two successive binary splittings of a heavy composite system. The sequence of fragment production is determined. Strong Coulomb proximity effects are observed in the three-fragment final state. A comparison with Coulomb trajectory calculations shows that the time scale between the consecutive break-ups decreases with increasing bombarding energy, becoming quasi-simultaneous above excitation energy E * = 4.0±0.5 MeV/A. This transition from sequential to simultaneous break-up was interpreted as the signature of the onset of multifragmentation for the three-fragment exit channel in this system.

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Mass-split dependence of the pre- and post-scission neutron multiplicities for fission of 251Es

Cited by 99 publications

References 23 publications

Isospin influence on the decay modes of compound systems produced in the^78,86Kr +^40,48Ca at 10 AMeV

Isospin influence on the decay modes of compound systems produced in the^78,86Kr +^40,48Ca at 10 AMeV

Reaction dynamics with exotic nuclei

Coulomb chronometry to probe the decay mechanism of hot nuclei

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Mass-split dependence of the pre- and post-scission neutron multiplicities for fission of 251Es

Cited by 99 publications

References 23 publications

Isospin influence on the decay modes of compound systems produced in the78,86Kr +40,48Ca at 10 AMeV

Isospin influence on the decay modes of compound systems produced in the78,86Kr +40,48Ca at 10 AMeV

Reaction dynamics with exotic nuclei

Coulomb chronometry to probe the decay mechanism of hot nuclei

Contact Info

Product

Resources

About

Isospin influence on the decay modes of compound systems produced in the^78,86Kr +^40,48Ca at 10 AMeV

Isospin influence on the decay modes of compound systems produced in the^78,86Kr +^40,48Ca at 10 AMeV