Astrophysically important Si-26 states studied with the Si-28(He-4, He-6)Si-26 reaction
- Authors
- Kwon, Y. K.; Lee, C. S.; Moon, J. Y.; Lee, J. H.; Kim, J. Y.; Cheoun, M. K.; Kubono, S.; Yamaguchi, H.; He, J. J.; Saito, A.; Wakabayashi, Y.; Fujikawa, H.; Amadio, G.; Iwasa, N.; Inafuku, K.; Khiem, L. H.; Tanaka, M.; Fuchi, Y.; Chen, A. A.; Kato, S.; Fukunishi, N.
- Issue Date
- Aug-2008
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- Al-26 cosmic radioactivity; nova explosion; Si-28(He-4,He-6)Si-26 reaction; particle analyzer
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.53, no.2, pp 1141 - 1145
- Pages
- 5
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 53
- Number
- 2
- Start Page
- 1141
- End Page
- 1145
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/53318
- DOI
- 10.3938/jkps.53.1141
- ISSN
- 0374-4884
1976-8524
- Abstract
- The emission of a 1.809-MeV gamma-ray from the first excited state of Mg-26, followed by beta-decay of Al-26 in its ground state (denoted as Al-26(g,s,)), has been identified by several gamma-ray telescopes. To resolve the controversy over the possible sources of the observational 1.809-MeV gamma-rays, one needs accurate knowledge of the production rate of Al-26(g.s.). The 25Al(p,gamma)Si-26 reaction is one of the most important astrophysical reactions to be investigated, but its rate is uncertain due to the lack of level information on Si-26 above the proton threshold (Q(p gamma) = 5.518 MeV). Illiadis et al. suggested that the Al-25(p, gamma)Si-26 reaction should be dominated by a 3(+) unnatural parity state at E-x = 5970 keV. Recent studies proposed several states as candidates for the 3(+) states. However, the spin-parity assignments for these states are still uncertain. In the present work, we measured the Si-28(He-4, He-6)(26) Si reaction at 120 MeV to confirm the unnatural parity states just above the proton threshold. The measurement was performed with the high-resolution particle analyzer at the Center for Nuclear Study, University of Tokyo. We observed a total of 22 excited states in Si-26. The 7018-keV level, which was only observed by Bardayan et al. with the Si-28(p, t)Si-26 reaction, was confirmed in our measurement. Among the candidates of unnatural parity states at E-x = 5678, 5916, and 5945 keV, the 5918-keV state was only observed within the error of the excitation energy. A new state at E-x = 6101 keV was also identified.
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