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Title: Search for spin-orbit-force reduction at {sup 106,108}Zr around r-process path

Abstract

Shell gap at the magic number N= 82 is important to reproduce the 2nd peak of r-process abundance. If a spin-orbit force is reduced in a very neutron-rich region, a shell quenching at N= 82 and a new shell closure at N70 are predicted. A shell evolution by the spin-orbit-force reduction can be searched for through the shape evolution of Zr isotopes around an expected double magic nuclei, {sup 110}Zr(Z = 40,N = 70). We performed {beta}-{gamma} and isomer spectroscopy at RIBF to observe low-lying states in {sup 106,108}Zr. The present results indicate a well deformed shape for {sup 106,108}Zr. The drastic reduction of the spin-orbit force most likely does not occur around {sup 110}Zr on an r-process path.

Authors:
;  [1];  [2];
  1. Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510 (Japan)
  2. RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
Publication Date:
OSTI Identifier:
22075742
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1484; Journal Issue: 1; Conference: Conference on origin of matter and evolution of galaxies 2011, Wako (Japan), 14-17 Nov 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BETA SPECTROSCOPY; DEFORMED NUCLEI; ELEMENT ABUNDANCE; GAMMA SPECTROSCOPY; ISOMERIC NUCLEI; L-S COUPLING; MAGIC NUCLEI; NEUTRONS; NUCLEAR FORCES; NUCLEAR STRUCTURE; QUENCHING; R PROCESS; SHELL MODELS; SPIN; ZIRCONIUM 106; ZIRCONIUM 108; ZIRCONIUM 110

Citation Formats

Sumikama, T., Yoshinaga, K., Watanabe, H., and and others. Search for spin-orbit-force reduction at {sup 106,108}Zr around r-process path. United States: N. p., 2012. Web. doi:10.1063/1.4763389.
Sumikama, T., Yoshinaga, K., Watanabe, H., & and others. Search for spin-orbit-force reduction at {sup 106,108}Zr around r-process path. United States. doi:10.1063/1.4763389.
Sumikama, T., Yoshinaga, K., Watanabe, H., and and others. Mon . "Search for spin-orbit-force reduction at {sup 106,108}Zr around r-process path". United States. doi:10.1063/1.4763389.
@article{osti_22075742,
title = {Search for spin-orbit-force reduction at {sup 106,108}Zr around r-process path},
author = {Sumikama, T. and Yoshinaga, K. and Watanabe, H. and and others},
abstractNote = {Shell gap at the magic number N= 82 is important to reproduce the 2nd peak of r-process abundance. If a spin-orbit force is reduced in a very neutron-rich region, a shell quenching at N= 82 and a new shell closure at N70 are predicted. A shell evolution by the spin-orbit-force reduction can be searched for through the shape evolution of Zr isotopes around an expected double magic nuclei, {sup 110}Zr(Z = 40,N = 70). We performed {beta}-{gamma} and isomer spectroscopy at RIBF to observe low-lying states in {sup 106,108}Zr. The present results indicate a well deformed shape for {sup 106,108}Zr. The drastic reduction of the spin-orbit force most likely does not occur around {sup 110}Zr on an r-process path.},
doi = {10.1063/1.4763389},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1484,
place = {United States},
year = {2012},
month = {11}
}