Angular momentum transfer in deep inelastic collisions for the Ar+Au and Cu+Au systems

Light particle emission in deeply inelastic collisions of 280 MeV40Ar+58Ni: Thermal equilibrium and angular momentum transfer

“…This aspect is currently the subject of several experimental programs. Average fragment spins and/or spin alignments have been deduced from studies of sequential fission [20][21][22][23], and from gamma ray multiplicities and associated angular correlation [24][25][26][27][28][29], and also from circular polarization measurements [30][31][32]. However, it should be pointed out that angular momentum estimates from 7-ray multiplicity measurements are subject to several ambiguities.…”

Angular momentum bearing modes and nuclear structure effects in12C-induced fission

“…The experimental data suggests the opposite trend, which implies that the incident/-distribution does not tell the whole story. As observed in other recent works [1,[3][4][5][6], the magnitudes of M~ are generally larger than expected on the basis of rigid rotation about an axis perpendicular to the symmetry axis. Consider, for example, the 180 MeV 12C+2~ reaction.…”

“…Recently, a number of 7-ray multiplicity (Mr) experiments have been performed to investigate the angular momentum associated with fission and fission-like processes [1][2][3][4][5][6]. Data from these measurements have revealed several trends that are in distinct contrast to those expected for a dinuclear system rotating rigidly about an axis perpendicular to the line of centers.…”

“…In other measurements, especially those involving asymmetric entrance channels, M r has been found to be nearly independent of the mass split [3,4]. Moreover, the magnitude of M r is often considerably larger than one would expect from the entrance channel /-distribution [1,[3][4][5][6], implying a spin enhancement effect. It has been suggested that the deviations from the rigid rotation pattern could arise from the excitation of the tilting mode [1], which, it should be recalled, forms the basis for the theory of fission fragment angular distributions.…”

Theory of molecular-orbital and compound-nucleus x-ray emission in heavy-ion-atom collisions with nuclear sticking

“…In selecting collisions where long lived CN are made, one selects collisions with a large totalkinetic-energy loss, which goes into y-ray, neutron, and charged-particle emission. Studies of y-ray multiplicities in DI and FF reactions give multiplicities of the order of 10 y-rays per collision [39], which are emitted with energies between 0 and 3 MeV. The actual y-ray background near the UA K x-ray lines depends on the experimental arrangement, e.g., on the size and shape of the y-ray detector, the use of Compton or neutron suppressors, and on the relative efficiency of detecting UA K x-rays to detecting y-ray background.…”