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Title: Shape Isomer And 'j-Isomer' In 66As And 67As

Abstract

Strong proton-neutron correlations in N {approx_equal} Z nuclei can lead to unusual structure. Using the spherical shell model, we show that a low-excitation shape isomer can occur in the odd-odd N = Z nucleus 66As. This extends the picture of shape coexistence beyond even-even nuclei. Furthermore, it is demonstrated that in 66As and in the N = Z + 1 nucleus 67As, a new type of isomer, which we term j-isomer, can be formed. The underlying mechanism for the isomerism formation is structure change in the isomeric states, which involves either an alignment of a neutron-proton pair from the high-j intruder orbits, or a simultaneous occupation of these neutron and proton high-j orbits.

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Laboratory of Physics, Fukuoka Dental College, Fukuoka 814-0193 (Japan)
  2. Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States)
  3. (United States)
  4. Department of Physics, Kyushu Sangyo University, Fukuoka 813-8503 (Japan)
  5. Institute of Natural Sciences, Senshu University, Tokyo 101-8425 (Japan)
Publication Date:
OSTI Identifier:
20798594
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 831; Journal Issue: 1; Conference: International conference on frontiers in nuclear structure, astrophysics, and reactions - FINUSTAR, Isle of Kos (Greece), 12-17 Sep 2005; Other Information: DOI: 10.1063/1.2200982; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ARSENIC 66; ARSENIC 67; CORRELATIONS; EVEN-EVEN NUCLEI; EXCITATION; ISOMERIC NUCLEI; NEUTRONS; ORBITS; PROTONS; SHAPE; SHELL MODELS

Citation Formats

Hasegawa, M., Sun, Y., Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, IN 46556, Kaneko, K., and Mizusaki, T.. Shape Isomer And 'j-Isomer' In 66As And 67As. United States: N. p., 2006. Web. doi:10.1063/1.2200982.
Hasegawa, M., Sun, Y., Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, IN 46556, Kaneko, K., & Mizusaki, T.. Shape Isomer And 'j-Isomer' In 66As And 67As. United States. doi:10.1063/1.2200982.
Hasegawa, M., Sun, Y., Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, IN 46556, Kaneko, K., and Mizusaki, T.. Wed . "Shape Isomer And 'j-Isomer' In 66As And 67As". United States. doi:10.1063/1.2200982.
@article{osti_20798594,
title = {Shape Isomer And 'j-Isomer' In 66As And 67As},
author = {Hasegawa, M. and Sun, Y. and Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, IN 46556 and Kaneko, K. and Mizusaki, T.},
abstractNote = {Strong proton-neutron correlations in N {approx_equal} Z nuclei can lead to unusual structure. Using the spherical shell model, we show that a low-excitation shape isomer can occur in the odd-odd N = Z nucleus 66As. This extends the picture of shape coexistence beyond even-even nuclei. Furthermore, it is demonstrated that in 66As and in the N = Z + 1 nucleus 67As, a new type of isomer, which we term j-isomer, can be formed. The underlying mechanism for the isomerism formation is structure change in the isomeric states, which involves either an alignment of a neutron-proton pair from the high-j intruder orbits, or a simultaneous occupation of these neutron and proton high-j orbits.},
doi = {10.1063/1.2200982},
journal = {AIP Conference Proceedings},
number = 1,
volume = 831,
place = {United States},
year = {Wed Apr 26 00:00:00 EDT 2006},
month = {Wed Apr 26 00:00:00 EDT 2006}
}