학술논문
Nanosecond lifetime measurements of Iπ=9/2- intrinsic excited states and low-lying B(E1) strengths in 183Re using combined HPGe-LaBr3 coincidence spectroscopy.
Document Type
Article
Author
Source
Subject
*GAMMA ray spectroscopy
*EXCITED states
*NUCLEAR structure
*ELECTRIC dipole transitions
*ELECTROMAGNETIC decays
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Language
ISSN
0969-806X
Abstract
This paper presents precision measurements of electromagnetic decay probabilities associated with electric dipole transitions in the prolate-deformed nucleus 183 Re. The nucleus of interest was formed using the fusion evaporation reaction 180 Hf( 7 Li,4n) 183 Re at a beam energy of 30 MeV at the tandem accelerator at the HH-IFIN Institute, Bucharest Romania. Coincident decay gamma rays from near-yrast cascades were detected using the combined HPGe-LaBr 3 detector array ROSPHERE. The time differences between cascade gamma rays were measured using the LaBr 3 detectors to determine the half-lives of the two lowest lying spin-parity 9/2 - states at excitation energies of 496 and 617 keV to be 5.65(5) and 2.08(3) ns respectively. The deduced E1 transition rates from these two states are discussed in terms of the K-hindrance between the low-lying structures in this prolate-deformed nucleus. [ABSTRACT FROM AUTHOR]