Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5494073 | Nuclear Physics A | 2017 | 18 Pages |
Abstract
The decay mechanism of 217Atâ formed in Li9+208Pb reaction is studied within the dynamical cluster-decay model (DCM) at various center-of-mass energies. The aim is to see the behavior of a light neutron-rich radioactive beam on a doubly-magic target nucleus for the (total) fusion cross section Ïfus and the individual decay channel cross sections. Experimentally, only the isotopic yield of heavy mass residues Atâ211-214 [equivalently, the light-particles (LPs) evaporation residue cross sections Ïxn for x=3-6 neutrons emission] are measured, with the fusion-fission (ff) component Ïff taken zero. For a fixed neck-length parameter ÎR, the only parameter in the DCM, we are able to fit Ïfus=âx=16Ïxn almost exactly for 9Li on 208Pb at all Ec.m.'s. However, the observed individual decay channels (3n-6n) are very poorly fitted, with unobserved channels (1n, 2n) and Ïff strongly over-estimated. Different ÎR values, meaning thereby different reaction time scales, are required to fit individually both the observed and unobserved evaporation residue channels (1n-6n) and Ïff, but then the compound nucleus (CN) contribution ÏCN is very small (<1%), and the non-compound nucleus (nCN) decay cross section ÏnCN contributes the most towards total Ïfus (=ÏCN+ÏnCN). Thus, the 9Li induced reaction on doubly-magic 208Pb is more of a quasi-fission-like nCN decay, which is further analyzed in terms of the statistical CN formation probability PCN and CN survival probability Psurv. For the reaction under study, PCN<<1 and Psurvâ1, in particular at above barrier energies.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Arshdeep Kaur, Hemdeep Hemdeep, Pooja Kaushal, Bivash R. Behera, Raj K. Gupta,