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Elastic scattering of Al-25 + p to explore the resonance structure in Si-26

Authors
Jung, H. S.Lee, C. S.Kwon, Y. K.Moon, J. Y.Lee, J. H.Yun, C. C.Kim, M. J.Hashimoto, T.Yamaguchi, H.Kahl, D.Kubono, S.Wakabayashi, Y.Togano, Y.Choi, SeonhoKim, Y. H.Kim, Y. K.Park, J. S.Kim, E. J.Moon, C. -B.Teranishi, T.Iwasa, N.Yamada, T.Kato, S.Cherubini, S.Hayakawa, S.Rapisarda, G. G.
Issue Date
Sep-2014
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW C, v.90, no.3, pp.1 - 8
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW C
Volume
90
Number
3
Start Page
1
End Page
8
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/159265
DOI
10.1103/PhysRevC.90.035805
ISSN
0556-2813
Abstract
Background: The properties of resonances in Si-26 are important to better constrain the Al-25(p,gamma)Si-26 reaction rate relevant to the synthesis of galactic Al-26(gs) and energy generation in explosive stellar environment at higher temperature. Purpose: Al-25 + p elastic scattering was measured to further constrain and investigate disagreements in resonance parameters for the high-lying excited states of Si-26 with high statistics and without background contamination within the target. Methods: The experiment was performed by bombarding a thick H-2 target with an Al-25 radioactive ion beam. The resonances at excitation energies of 6.6-8.3 MeV in the Si-26 compound nucleus were studied at the low-energy radioactive-ion beam facility CRIB (Center for Nuclear Study Radioactive Ion Beam separator) at the University of Tokyo. Results: Six resonant states were observed and their resonance parameters were extracted by an R-matrix analysis. Our resonance parameters for two levels are in good agreement with the results of previous studies, while for four others, excitation energy, proton partial width, and spin-parity assignment disagree with the results of recent study via elastic scattering of Al-25 + p. Conclusion: The parameters of resonant states in Si-26 determined in the present work for the Al-25(p,gamma)Si-26 reaction rate are consistent with that of the previous result, solving spin-parity assignment discrepancies between experiments, relevant at higher temperatures.
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