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Title: Spectroscopy of low-lying states in neutron-deficient astatine and francium nuclei

Low-lying states in neutron-deficient astatine and francium nuclei have been studied by means of in-beam and delayed spectroscopy. The 13/2{sup +} state has been observed in francium nuclei with a similar down-sloping trend as in neighbouring astatine and bismuth isotopes, as a function of decreasing neutron number. A systematic trend can also now be seen for the 1/2{sup +} state both in astatine and francium nuclei, where the level energy decreases steeply as a function of neutron number when moving further away from the neutron shell closure. This trend is very similar between astatine nuclei and their francium isotones. Moreover, shape coexistence has been observed between the 13/2{sup +} state and the spherical 9/2{sup −} ground state in {sup 203}Fr and {sup 205}Fr.
Authors:
;  [1] ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [2] more »; « less
  1. KTH, The Division of Nuclear Physics, AlbaNova University Center, SE-10691 Stockholm (Sweden)
  2. University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 University of Jyvaskyla (Finland)
Publication Date:
OSTI Identifier:
22492458
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1681; Journal Issue: 1; Conference: Nuclear Structure and Dynamics '15: 3. international nuclear physics conference on nuclear structure and dynamics, Portoroz (Slovenia), 14-19 Jun 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ASTATINE ISOTOPES; BEAMS; BISMUTH ISOTOPES; FRANCIUM 203; FRANCIUM 205; GROUND STATES; ISOTONIC NUCLEI; NEUTRONS; SHELL MODELS; SPECTROSCOPY; SPHERICAL CONFIGURATION