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

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Title
Elastic scattering of Al 25 +p to explore the resonance structure in Si 26
Author(s)
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 S.; Kim 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.
Publication Date
2014-09
Journal
PHYSICAL REVIEW C, v.90, no.3, pp.035805-1 - 035805-8
Publisher
AMER PHYSICAL SOC
Abstract
Background: The properties of resonances in 26Si are important to better constrain the 25Al(p,γ )26Si reaction rate relevant to the synthesis of galactic 26Algs and energy generation in explosive stellar environment at higher temperature. Purpose: 25Al + p elastic scatteringwasmeasured to further constrain and investigate disagreements in resonance parameters for the high-lying excited states of 26Si with high statistics and without background contamination within the target. Methods: The experiment was performed by bombarding a thick H2 target with an 25Al radioactive ion beam. The resonances at excitation energies of 6.6–8.3 MeV in the 26Si 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 25Al + p. Conclusion: The parameters of resonant states in 26Si determined in the present work for the 25Al(p,γ )26Si reaction rate are consistent with that of the previous result, solving spin-parity assignment discrepancies between experiments, relevant at higher temperatures.
URI
http://pr.ibs.re.kr/handle/8788114/2943
DOI
10.1103/PhysRevC.90.035805
ISSN
0556-2813
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