Spins and parities of astrophysically important 30S states from 28Si(3He,nγ)30S

被引：12

作者：

Setoodehnia, K. ^{[1
]}

Chen, A. A. ^{[1
,2
]}

Komatsubara, T. ^{[3
]}

Kubono, S. ^{[4
]}

Binh, D. N. ^{[4
]}

Carpino, J. F. ^{[1
]}

Chen, J. ^{[1
]}

Hashimoto, T. ^{[4
]}

Hayakawa, T. ^{[5
]}

Ishibashi, Y. ^{[3
]}

Ito, Y. ^{[3
]}

Kahl, D. ^{[4
]}

Moriguchi, T. ^{[3
]}

Ooishi, H. ^{[3
]}

Ozawa, A. ^{[3
]}

Shizuma, T. ^{[5
]}

Sugiyama, Y. ^{[3
]}

Yamaguchi, H. ^{[4
]}

机构：

[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[2] Tech Univ Munich, D-85748 Garching, Germany

[3] Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058577, Japan

[4] Univ Tokyo, CNS, Wako Branch, RIKEN, Wako, Saitama 3510198, Japan

[5] JAEA, Tokai, Ibaraki 3191195, Japan

来源：

PHYSICAL REVIEW C | 2011年 / 83卷 / 01期

基金：

日本学术振兴会; 加拿大自然科学与工程研究理事会;

关键词：

THERMONUCLEAR REACTION-RATES; X-RAY-BURSTS; NOVA NUCLEOSYNTHESIS; PRESOLAR GRAINS; NUCLEI; DECAY; GRAPHS; TABLES; SHELL;

D O I：

10.1103/PhysRevC.83.018803

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The structure of proton-unbound S-30 states strongly determines the thermonuclear P-29(p,gamma)S-30 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-x = 4.7-4.8 MeV region, with spin and parity assignments of 3(+) and 2(+). 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 S-30 with the Si-28(He-3, n gamma)S-30 reaction. By constructing the decay schemes of proton-unbound states with a gamma-gamma coincidence analysis of their decay gamma rays, their J(pi) values were inferred from a comparison to the known decay schemes of the corresponding mirror states in Si-30. For the two aforementioned states, our results strongly corroborate the spin-parity assignments assumed in recent evaluations of the P-29(p,gamma)S-30 reaction rate.

引用

页数：4

共 20 条

[1] DECAY SCHEMES OF AL-30, P-30, AND O-20 [J].