Intermediate structure in strongly damped 12C + 24Mg reactions of the orbiting type

Glaesner, A.; Dünnweber, W.; Hering, W.; Konnerth, D.; Ritzka, R.; Singh, Raghuvir; Trombik, W.

doi:10.1016/0370-2693(86)90640-4

Cited by 39 publications

(15 citation statements)

References 17 publications

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“…However, it is relevant to also comment briefly on the possible manifestation of this phenomenon in heavy-ion collisions. In particular, memory effects are suggested [24] to be a sufficient condition to explain nonselfaveraging of the excitation function oscillations in dissipative heavy-ion collisions [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46]. It has also been found that spin and parity S-matrix correlation allows one to account for the oscillating non-Lorentzian behaviour of the cross section energy autocorrelation functions in 58 Ni + 62 Ni elastic and inelastic scattering [47].…”

Section: Resultsmentioning

confidence: 99%

Statistical reactions with memory and thermalized-nonequilibrated nuclear states

Kun

1997

Z Phys A - Particles and Fields

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Starting from the Feshbach S-matrix pole expansion we modify the standard statistical model for compound reactions by introducing correlations between fluctuating Smatrix elements with different J (total spin) and π (parity) values. The S-matrix (J, π)-correlations are obtained at the expense of introducing infinitesimally small entrance-exit channel off-diagonal (J, π)-correlations between the random variables of the statistical model. Although later on these correlations are switched off by means of a properly applied limiting procedure, the S-matrix (J, π)-correlations do not vanish and can be strong. The physical origin of the S-matrix (J, π)-correlations resembles the effect of spontaneous symmetry breaking while S-matrix (J, π)-decoherence is due to quantum chaos. Novel reaction mechanism results in the excitation of peculiar nuclear states: The intermediate system is thermalized so that the shape of the spectrum is angle-independent and Maxwellian with angle-independent slope, yet the intermediate nucleus is not equilibrated since the angular distribution is forward-peaked, i.e., memory of the direction of the initial beam is not lost. The existence of thermalized-nonequilibrated nuclear states is supported by data on the 50-100% forward peaking of neutrons in the typically evaporation (1-3.5 MeV) part of the spectrum observed in the 93 Nb(n, n ) scattering with E n = 7 MeV.

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Section: Resultsmentioning

confidence: 99%

Statistical reactions with memory and thermalized-nonequilibrated nuclear states

Kun

1997

Z Phys A - Particles and Fields

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“…The experimental results obtained for the 24Mg § 12C [8,11,13], 28Si, + lZC [6], 24Mg+ 160 [7,9] and 28Si+ ~4N [10,12] reactions have been interpreted in terms of the formation and decay of a long-lived rotating di-nuclear complex. This di-nuclear system can be formed in the early stages of the collision and then breaks apart in two pieces, while the longer-lived and relaxed complexes will evolve continuously towards more compact fusion configurations which consequently undergo binary fission.…”

Section: Equilibrium Model For Orbitingmentioning

confidence: 95%

Competition between the fusion-fission and deep-inelastic orbiting mechanisms in the35Cl +12C reaction

Beck

Djerroud

Haas

et al. 1992

Z. Physik A - Hadrons and Nuclei

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The binary decay properties of the 477 nucleus, produced in the 35C1 + 12C reaction, have been investigated at the 35C1 bombarding energies Elab=180 and 200 MeV by means of a kinematical coincidence technique. Binary reaction products show full energy equilibration and a characteristic 1/sin(0om ) angular distribution. The elemental distribution of the fully-damped products is asymmetric, similar to what has previously been observed in the decay of the 56Ni nucleus. Comparison with theoretical model predictions suggests the occurrence of a fusion-fission rather than orbiting process. Moreover the calculations performed using the Extended HauserFeshbach Method reproduce well the experimental fission yields~ A general discussion of orbiting and fusionfission experimental data of light heavy-ion systems is presented in the framework of the calculated number of available open channels for these systems.

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“…This coexistence has been experimentally observed in the formation of the 20,22 Ne [4], 28 Al [5], 36 Ar [6], 40 Ca [7], 47 V [8], and 48 Cr [9] dinuclear systems. In these studies, most of these dinuclear systems were formed via different entrance channels, in order to ascertain whether the CN was playing a key role in the reaction mechanism.…”

mentioning

confidence: 97%

Entrance-channel mass-asymmetry dependence of compound nucleus formation time in light heavy-ion reactions

et al. 1996

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Intermediate structure in strongly damped 12C + 24Mg reactions of the orbiting type

Cited by 39 publications

References 17 publications

Statistical reactions with memory and thermalized-nonequilibrated nuclear states

Statistical reactions with memory and thermalized-nonequilibrated nuclear states

Competition between the fusion-fission and deep-inelastic orbiting mechanisms in the35Cl +12C reaction

Entrance-channel mass-asymmetry dependence of compound nucleus formation time in light heavy-ion reactions

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