High-spin, multiparticle isomers in {sup 121,123}Sb

Journal Article · Sat Mar 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.034311· OSTI ID:21189829

Jones, G A; Walker, P M; Podolyak, Zs; Cullen, I J; Garnsworthy, A B; Liu, Z; Thompson, N J ^[1]; Williams, S J ^[1]; Zhu, S; Carpenter, M P; Janssens, R V. F.; Khoo, T L; Seweryniak, D ^[2]; Carroll, J J ^[3]; Chakrawarthy, R S; Hackman, G ^[4]; Chowdhury, P ^[5]; Dracoulis, G D; Lane, G J ^[6]; Kondev, F G ^[7]

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1. Department of Physics, University of Surrey, Guildford GU2 7XH (United Kingdom)
2. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. Department of Physics and Astronomy, Youngstown State University, Youngstown, Ohio 44555 (United States)
4. TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada)
5. University of Massachusetts Lowell, Lowell, Massachusetts 01854 (United States)
6. Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra 0200 (Australia)
7. Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

Isomers in near-spherical Z=51, antimony isotopes are reported here for the first time using fusion-fission reactions between {sup 27}Al and a pulsed {sup 178}Hf beam of energy, 1150 MeV. {gamma} rays were observed from the decay of isomeric states with half-lives, T{sub 1/2}=200(30) and 52(3){mu}s, and angular momenta I=((25/2)) and I{sup {pi}}=(23/2){sup +}, in {sup 121,123}Sb, respectively. These states are proposed to correspond to {nu}(h{sub (11/2)}){sup 2} configurations, coupled to an odd d{sub (5/2)} or g{sub (7/2)} proton. Nanosecond isomers were also identified at I{sup {pi}}=(19/2){sup -} [T{sub 1/2}=8.5(5) ns] in {sup 121}Sb and I{sup {pi}}=((15/2){sup -}) [T{sub 1/2}=37(4) ns] in {sup 123}Sb. Information on spins and parities of states in these nuclei was obtained using a combination of angular correlation and intensity-balance measurements. The configurations of states in these nuclei are discussed using a combination of spin/energy systematics and shell-model calculations for neighboring tin isotones and antimony isotopes.

• OSTI ID: 21189829
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 77, Issue 3; Other Information: DOI: 10.1103/PhysRevC.77.034311; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27
ANGULAR CORRELATION
ANTIMONY
ANTIMONY 121
ANTIMONY 123
ATOMIC NUMBER
BEAMS
DECAY
FISSION
GAMMA RADIATION
HAFNIUM 178
HALF-LIFE
ISOMERS
ISOTONIC NUCLEI
MEV RANGE
PARITY
PROTONS
SHELL MODELS
SPHERICAL CONFIGURATION
SPIN