Structural Evolution in the Neutron-Rich Nuclei {sup 106}Zr and {sup 108}Zr

Journal Article · Fri May 20 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.202501· OSTI ID:21538348

Sumikama, T; Yoshinaga, K; Miyashita, Y; Sugimoto, K; Chiba, J; Nakano, T; Takano, S ^[1]; Watanabe, H; Nishimura, S; Li, Z; Baba, H; Doornenbal, P; Isobe, T; Kurata-Nishimura, M; Sakurai, H; Scheit, H; Steppenbeck, D ^[2]; Yamaguchi, K ^[3]; Berryman, J S ^[4]; Blasi, N ^[5]

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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)
3. Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043 Japan (Japan)
4. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
5. INFN, Sezione di Milano, via Celoria 16, I-20133 Milano (Italy)

The low-lying states in {sup 106}Zr and {sup 108}Zr have been investigated by means of {beta}-{gamma} and isomer spectroscopy at the radioactive isotope beam factory (RIBF), respectively. A new isomer with a half-life of 620{+-}150 ns has been identified in {sup 108}Zr. For the sequence of even-even Zr isotopes, the excitation energies of the first 2{sup +} states reach a minimum at N=64 and gradually increase as the neutron number increases up to N=68, suggesting a deformed subshell closure at N=64. The deformed ground state of {sup 108}Zr indicates that a spherical subshell gap predicted at N=70 is not large enough to change the ground state of {sup 108}Zr to the spherical shape. The possibility of a tetrahedral shape isomer in {sup 108}Zr is also discussed.

• OSTI ID: 21538348
• Journal Information: Physical Review Letters, Vol. 106, Issue 20; Other Information: DOI: 10.1103/PhysRevLett.106.202501; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
EXCITATION
GROUND STATES
HALF-LIFE
ISOMERS
NEUTRON-RICH ISOTOPES
NEUTRONS
SHAPE
SPECTROSCOPY
SPHERICAL CONFIGURATION
ZIRCONIUM 106
ZIRCONIUM 108
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CONFIGURATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
FERMIONS
HADRONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
NUCLEI
NUCLEONS
RADIOISOTOPES
ZIRCONIUM ISOTOPES