High-spin, multi-particle isomers in {sup 121,123}Sb.
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){micro}s, and angular momenta I = (25/2) and I{pi} = 23/2 +, in {sup 121,123}Sb, respectively. These states are proposed to correspond to {nu}(h 11/2){sup 2} configurations, coupled to an odd d 5/2 or g 7/2 proton. Nanosecond isomers were also identified at I {pi} = 19/2 - [T{sub 1/2} = 8.5(5) ns] in {sup 121}Sb and I{pi} = (15/2 -) [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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); US AFOSR; AWE; Engineering and Physical Sciences Research Council (EPSRC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 958262
- Report Number(s):
- ANL/PHY/JA-59488; PRVCAN; TRN: US1000183
- Journal Information:
- Phys. Rev. C, Vol. 77, Issue 2008; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- ENGLISH
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