학술논문
Study of parity-doublet structure in the 147 La nucleus.
Document Type
Article
Author
Source
Subject
*LANTHANUM
*PARITY (Physics)
*EXCITED states
*GAMMA rays
*NUCLEAR excitation
*SPONTANEOUS fission
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Language
ISSN
2101-6275
Abstract
The work reports several new excited states in the neutron-rich 147La nucleus, populated in spontaneous fission of 252Cf. The excitation scheme has been reinvestigated by means of γ-ray spectroscopy, using high-fold γ coincidences measured with the Gammasphere array of Ge detectors. It is shown that the 229.65-keV level has spin and parity 11/2-, which changes the 9/2- spin-parity reported in a recent evaluation and sets up the spinparity of the ground state as 5/2+. New levels allow to arrange the excitation scheme of 147La into a parity-doublet-like structure showing that the 147La nucleus may have an octupole deformation. [ABSTRACT FROM AUTHOR]