학술논문
Isomer studies in the vicinity of the doubly-magic nucleus 100Sn: Observation of a new low-lying isomeric state in 97Ag
Document Type
article
Author
Christine Hornung; Daler Amanbayev; Irene Dedes; Gabriella Kripko-Koncz; Ivan Miskun; Noritaka Shimizu; Samuel Ayet San Andrés; Julian Bergmann; Timo Dickel; Jerzy Dudek; Jens Ebert; Hans Geissel; Magdalena Górska; Hubert Grawe; Florian Greiner; Emma Haettner; Takaharu Otsuka; Wolfgang R. Plaß; Sivaji Purushothaman; Ann-Kathrin Rink; Christoph Scheidenberger; Helmut Weick; Soumya Bagchi; Andrey Blazhev; Olga Charviakova; Dominique Curien; Andrew Finlay; Satbir Kaur; Wayne Lippert; Jan-Hendrik Otto; Zygmunt Patyk; Stephane Pietri; Yoshiki K. Tanaka; Yusuke Tsunoda; John S. Winfield
Source
Physics Letters B, Vol 802, Iss , Pp - (2020)
Subject
Language
English
ISSN
0370-2693
Abstract
Long-lived isomeric states in 97Ag and 101−109In were investigated with the FRS Ion Catcher at GSI. In the isotope 97Ag, a long-lived (1/2−) isomeric state was discovered, and its excitation energy was determined to be 618(38) keV. This is simultaneously the first discovery of a nuclear isomeric state by multiple-reflection time-of-flight mass spectrometry. The measured excitation energies were compared to large-scale shell-model calculations, which indicated the importance of core excitation around 100Sn. Furthermore, advanced mean-field calculations for the 97Ag nucleus and relevant neighboring nuclei were performed, which have contributed to a better understanding of the repetitive appearance of certain isomeric structures in neighboring nuclei, and which have supported the discovery of the isomeric state in 97Ag in a global shell-evolution scheme. Keywords: Mass spectrometry, Multiple-reflection time-of-flight mass spectrometry, Nuclear structure, Isomers, Isomer-to-ground state ratio, Exotic nuclei