학술논문
High-spin states in 212Po above the α-decaying (18+) isomer
Document Type
article
Author
L. Zago; A. Gottardo; J.J. Valiente-Dobón; G. Benzoni; A. Gadea; M. Górska; S. Lunardi; Zs. Podolyák; P.H. Regan; D. Rudolph; A. Algora; G. de Angelis; D. Bazzacco; J. Benlliure; P. Boutachkov; A. Bracco; A.M. Bruce; F. Camera; E. Casarejos; M.L. Cortés; F.C.L. Crespi; A. Corsi; C. Domingo-Pardo; M. Doncel; T. Engert; H. Geissel; J. Gerl; A. Goasduff; N. Goel; J. Grebosz; E. Gregor; T. Habermann; S. Klupp; I. Kojouharov; N. Kurz; S.M. Lenzi; S. Leoni; S. Mandal; R. Menegazzo; D. Mengoni; B. Million; A.I. Morales; D.R. Napoli; F. Naqvi; C. Nociforo; M. Pfützner; S. Pietri; A. Prochazka; F. Recchia; E. Sahin; H. Schaffner; A. Sharma; B. Sitar; D. Siwal; P. Strmen; I. Szarka; C.A. Ur; P.M. Walker; H. Weick; O. Wieland; H.-J. Wollersheim
Source
Physics Letters B, Vol 834, Iss , Pp 137457- (2022)
Subject
Language
English
ISSN
0370-2693
Abstract
The nucleus 212Po has been produced through the fragmentation of a 238U primary beam at 1 GeV/nucleon at GSI, separated with the FRagment Separator, FRS, and studied via isomer γ-decay spectroscopy with the RISING setup. Two delayed previously unknown γ rays have been observed. One has been attributed to the E3 decay of a 21− isomeric state feeding the α-emitting 45-s (18+) high-spin isomer. The other γ-ray line has been assigned to the decay of a higher-lying 23+ metastable state. These are the first observations of high-spin states above the 212Po (18+) isomer, by virtue of the selectivity obtained via ion-by-ion identification of 238U fragmentation products. Comparison with shell-model calculations points to shortfalls in the nuclear interactions involving high-j proton and neutron orbitals, to which the region around Z∼100 is sensitive.