Isomeric ratios for ^{196,198}{\rm Tl} and ^{196,198}{\rm Au} from fusion and transfer in the interaction of ⁶He with ¹⁹⁷Au

Abstract

Excitation functions and isomeric cross-section ratios have been measured for the isomeric pairs 198m,gTl, 196m,gTl, 198m,gAu and 196m,gAu, formed in fusion–evaporation and transfer processes in reactions of 6He with 197Au in the energy range 7–60 MeV. The population probability of high- and low-spin states in the fusion reaction with the formation of 198Tl and 196Tl (Jπm = 7+, Jπg = 2−), as well as of the transfer products 198Au and 196Au (Jπm = 12−, Jπg = 2−) is compared with calculations within the statistical model and with similar results, obtained in reactions induced by other nuclei.

Time-dependent quantum models of the dynamics of neutron transfer reactions near the barrier

“…The neutron cloud in this case covers both the nuclei, and an appropriate integral can serve as a measure of the probability of the neutron transfer from one nucleus to another. Results of the cross section calculation for the formation of the 198 Au isotope in the 6 He+ 197 Au reaction [13] agree satisfactorily with the experimental data [14] near the barrier (Fig. 2).…”

Elastic scattering, fusion, and breakup of light exotic nuclei

“…Isomeric ratios for several isotopes of Tl, Au, and Hg were also determined. Isomeric ratios for 196,198 Tl and 196,198 Au produced via 6 He + 197 Au fusion and transfer reactions had already been measured by Kulko et al [45]. Population probabilities for high-and low-spin states were determined in the range from 7-60 MeV and compared with statisticalmodel calculations.…”

Microscopic time-dependent analysis of neutrons transfers at low-energy nuclear reactions with spherical and deformed nuclei

“…The probability P of neutrons localization in vicinity of the nuclei was determined by corresponding integrating the M-body probability density ( ) (Fig. 2a,b) demonstrate quality agreement between simple approximation with exception transfer to occupied states and a few body wave function approximation (7), (8). and stripping (dashed curves) for 48 Са at frontal collision 48 Са + 238 U as function m r in approximation (7), (8) with M=3 for small total angular moment projection Ω=1/2, 3/2.…”