Spins and parities of astrophysically important {sup 30}S states from {sup 28}Si({sup 3}He, n{gamma}){sup 30}S

Journal Article · Sat Jan 15 04:00:00 EST 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.018803· OSTI ID:21499384

Setoodehnia, K; Carpino, J F; Chen, J ^[1]; Chen, A A ^[1]; Komatsubara, T; Ishibashi, Y; Ito, Y; Moriguchi, T; Ooishi, H; Ozawa, A; Sugiyama, Y ^[2]; Kubono, S; Binh, D N; Hashimoto, T; Kahl, D; Yamaguchi, H ^[3]; Hayakawa, T; Shizuma, T ^[4]

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1. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)
2. Institute of Physics, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8577 (Japan)
3. Center for Nuclear Study (CNS), University of Tokyo, Wako Branch at RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
4. Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195 (Japan)

The structure of proton-unbound {sup 30}S states strongly determines the thermonuclear {sup 29}P(p,{gamma}){sup 30}S reaction rate at temperatures characteristic of explosive hydrogen burning in classical novae and type I x-ray bursts. Specifically, the rate had been previously predicted to be dominated by two low-lying, unobserved, levels in the E{sub x}= 4.7-4.8 MeV region, with spin and parity assignments of 3{sup +} and 2{sup +}. In recent experimental work, two candidate levels were observed with energies of 4.699 MeV and 4.814 MeV, but no experimental information on their spins and parities was obtained. We have performed an in-beam {gamma}-ray spectroscopy study of {sup 30}S with the {sup 28}Si({sup 3}He, n{gamma}){sup 30}S reaction. By constructing the decay schemes of proton-unbound states with a {gamma}-{gamma} coincidence analysis of their decay {gamma} rays, their J{sup {pi}} values were inferred from a comparison to the known decay schemes of the corresponding mirror states in {sup 30}Si. For the two aforementioned states, our results strongly corroborate the spin-parity assignments assumed in recent evaluations of the {sup 29}P(p,{gamma}){sup 30}S reaction rate.

• OSTI ID: 21499384
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 83; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

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