Fisslon-fragment angular distributions under extreme conditions: Following sequential to deep-inelastic collisions and complete fusion in 10Ar(10 MeV/u) + natU

Schwinn, E.; Cramer, B.; Ingold, Gert‐Ludwig; Jahnke, U.; Hilscher, D.; Lehmann, M.; Rossner, H.

doi:10.1016/0375-9474(89)90688-x

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…Since the early seventies, we h o w that with heavy projectiles of energies up to 10-20 MeVInucleon, excited nuclei can be formed either in fusion reactions or in deep inelastic collisions, depending on impact parameter, incident energy, mass and/or mass asymmetry of the interacting nuclei (Schrder et a1 1984, Gobbi andNorenberg 1980, Toke andSchroder 1992). A beautiful illustration of this can be found in the study of 10 MeVlnucleon Ar-induced reactions on U (Schwinn et al 1989). As shown in figure 15, giving the population of fission events as a function of neutron multiplicity and relative emission angle of the fission fragments, there exist two well separated families of events.…”

Section: Hot Nuclei In Heavy-ion-induced Reactionsmentioning

confidence: 93%

“…The first aspect which has been investigated in some detail with 4ir neutron detectors is the influence of bombarding energy on energy dissipation. The Ar+(Au or Th) systems were studied at 10, 27, 35, 44, 77 MeV/nucleon (Schwinn 1989, Jiang et al 1989, Sokolov et al 1993, Schwinn et al 1994, i.e. in an energy domain that encompasses the Fermi energy range of the nucleons in their respective partners.…”

Section: Irlpuence Of Bombarding Energy On Energy Dissipationmentioning

confidence: 99%

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Hot nuclei as viewed through 4 pi neutron multiplicity filters

Galin¹,

Jahnke²

1994

J. Phys. G: Nucl. Part. Phys.

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Several aspects of hot nuclei are examined in the present review article. After defining what is usually meant by hot nuclei, the new tools which have been developed in order to determine the temperature are described. Using several examples, it is demonstrated that the 4 pi neutron multiplicity filters constitute a powerful and reliable means for nuclear temperature measurements. So far, hot nuclei have been essentially investigated through nucleus-nucleus collisions. The conditions of formation of hot nuclei in such collisions, as a function of the entrance channel parameters (bombarding energy, mass asymmetry, impact parameter) are studied in detail. Two specific decay channels of hot nuclei: binary fission and emission of intermediate mass fragments, as well as the combined effect of temperature and spin are reviewed. It is shown that energetic light particles can also be successfully used to generate hot nuclei. Such nuclei left with little initial compression and spin are of special interest in order to investigate the effect of heat and only heat on the properties and on the fate of nuclei. This is not possible in nucleus-nucleus collisions. Prospects are finally given, with the annihilation of energetic antiprotons in nuclei appearing as the most promising method of reaching the limiting temperature that a nucleus can sustain.

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Section: Hot Nuclei In Heavy-ion-induced Reactionsmentioning

confidence: 93%

Section: Irlpuence Of Bombarding Energy On Energy Dissipationmentioning

confidence: 99%

Hot nuclei as viewed through 4 pi neutron multiplicity filters

Galin¹,

Jahnke²

1994

J. Phys. G: Nucl. Part. Phys.

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“…In addition the absolute values of E*N associated with increasing LMT -as long as the saturation in the energy that can be thermalized after violent collisions is not yet reached -reduce the region of pronounced correlations between LMT and M4~ to ever smaller values of p, whereas the plateau region with essentially constant M4~ extends [8,9].…”

Section: Iv3 Multiplicities M4~(e~n )mentioning

confidence: 99%

“…Measurements with 4~ projectiles on 197Au, Z32Th for e = 27 and 44 MeV/u yielded multiplicities M4~ saturating with increasing LMT and thus indicating a saturation in the energy dissipation for a given type of projectile [2,[8][9][10][11]. This saturation starts beyond the peripheral LMT peak and is fully attributed to effects broadening the distribution of O12, in particular neutron evaporation [2,[7][8][9].…”

Section: Introductionmentioning

confidence: 98%

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Total neutron multiplicities as a measure of the violence in heavy ion reactions

Knoche

Sprute

Behrmann

et al. 1992

Z. Physik A - Hadrons and Nuclei

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Energy spectra and multiplicities of neutrons from the reaction system 838 MeV 32S projectiles on 197Au have been measured in coincidence with binary fragmentations. Neutron detection was performed simultaneously in a 4re scintillator sphere and by time-of-flight. The linear momentum transfer (LMT) and the excitation energy E~N are deduced with the folding angle technique. Neutron multiplicities are compared for consistency and discussed as a measure of LMT and E*N. The saturation of M4~(E*N) beyond E*N ~ 400 MeV seen for several systems of high fissility (x > 0.8) is attributed to the spreading of the folding angle distribution and the increasing competition of charged particle evaporation.

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Radiation safety at low energy heavy-ion accelerators

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1993

Nuclear Instruments and Methods in Physics Research Section B:

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Fisslon-fragment angular distributions under extreme conditions: Following sequential to deep-inelastic collisions and complete fusion in 10Ar(10 MeV/u) + natU

Cited by 9 publications

References 4 publications

Hot nuclei as viewed through 4 pi neutron multiplicity filters

Hot nuclei as viewed through 4 pi neutron multiplicity filters

Total neutron multiplicities as a measure of the violence in heavy ion reactions

Radiation safety at low energy heavy-ion accelerators

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