Cold Kr-86 valley in superheavy Z=104-120 nuclei

Citation
Rk. Gupta et al., Cold Kr-86 valley in superheavy Z=104-120 nuclei, J PHYS G-NU, 27(4), 2001, pp. 867-881
Citations number
61
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
ISSN journal
0954-3899 → ACNP
Volume
27
Issue
4
Year of publication
2001
Pages
867 - 881
Database
ISI
SICI code
0954-3899(200104)27:4<867:CKVISZ>2.0.ZU;2-I
Abstract
Based on the cold fusion reaction valleys, referring to the minima in the p otential energy surfaces calculated on quantum mechanical fragmentation the ory, some of us and collaborators suggested the use of a Kr-86 beam or its neighbouring nuclei in their very first publications of 1976-7. More recent ly, one of us (RKG) and collaborators stressed its use again in 1993-4. In view of the very recent experiments, reporting the use of a Kr-86 beam for the cold synthesis of the Z = 118 element, here we have re-investigated thi s problem for a large number of Z = 104-120 nuclei. We find that the use of a Kr-86 beam for cold fusion reactions is as appropriate as the Pb and Ca nuclei and the optimum targets are Yb-174, W-184 and Pb-208, respectively, for synthesizing the:(260)(106)Sg, (270)110 and (294)118 nuclei. The Kr-86 + Pb-208 is the reaction used in the above-mentioned Berkeley and GSI exper iments. For other elements, lighter than Z = 118, the Se-34 beam is found t o compete with the Kr-36 beam, whereas for Z > 118 elements Sr-38 is shown to be a natural choice, Ge-32 and Zr-40 are found to be more suitable for t he production of neutron-rich isotopes, thereby requiring the use of radioa ctive nuclear beams. The radioactive nuclear beams (and targets) are predic ted to be of great use for many other nuclei. The role of Kr-86 (being simi lar to the doubly magic Pb-208 Or Ca-48) is perhaps related to the recently predicted strong shell stabilizing effects of Kr-76 in cluster decay studi es.