Alpha-particle emission from the reaction 1354 MeVHo165+Ta

Abstract

The emission of a particles from the deep-inelastic reaction 1354 MeV 165 Ho + 181 ra has been studied. Alpha particles were detected in coincidence with a projectile-like fragment, both in and out of the reaction plane. Average velocity diagrams, a-particle energy spectra as a function of angle, and a-particle angular distributions are presented. The in-plane data show that the bulk of·the a particles in coincidence with the deep-inelastic exit channel can be explained by evaporation from the fully accelerated fragments. The o~t-of-~lane a-particle angular distribution data together with gamma-ray multiplicity data from previous work give a consistent picture of the transfer and partitioning of angular momentum between the two fragments./NUCLEAR REACTIONS 181 ra ( 165 Ho, HI a)ELab = 1354 MeV: measured a (E ,g ,0 ), in-and out-of-plane anisotropies: a a a a deduced a-particle multiplicity, nuclear temperature.

Fission and emission of H and He in the reactions of 215 MeV16O with181Ta,208Pb and238U

“…Typically in the forward hemisphere (forward here means in the direction of the lighter collision partner), the energy spectra show a broad, high-energy component , and in the backward hemisphere there is a more narrow, nearly isotropic lower-energy component [2,4,5,8,17,19,20,38,[55][56][57][58][59][60][61][62][63][64][65][66]. The forward-peaked component has been shown to include some sequential evaporation from the target and/or projectile-like fragments [7,16,24,30,33,37,44,52,54,[67][68][69][70][71][72][73][74][75][76][77][78][79] and also some direct (or prethermalization) emission that occurs during the initial impact [13, 15, 19, 25, 26, 29, 33-35, 37, 38, 40, 45, 52, 54, 74, 77, 80-94]. The spectra in the backward hemisphere include some evaporation from fission-like fragments [-95, 96], but often contain a significant amount of emission from the composite system prio...…”

Angular momentum transfer in the deepinelastic reaction 245 MeV32S +64Ni from neutron angular correlations

“…Therefore it seems to be most reasonable to assume a rigidly rotating intermediate and to compare the data with equilibrium calculations [9,11,14,29]. Hence, for the width of the spin distribution we adopted the long-time equilibrium limit suggested by transport theory [20].…”