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Investigation of the thermonuclear Ne-18(alpha,p)Na-21 reaction rate via resonant elastic scattering of Na-21 + p
Zhang, LY; He, JJ; Parikh, A; Xu, SW; Yamaguchi, H; Kahl, D; Kubono, S; Mohr, P; Hu, J; Ma, P; Chen, SZ; Wakabayashi, Y; Wang, HW; Tian, WD; Chen, RF; Guo, B; Hashimoto, T; Togano, Y; Hayakawa, S; Teranishi, T; Iwasa, N; Yamada, T; Komatsubara, T; Zhang, YH; Zhou, XH; jianjunhe@impcas.ac.cn
2014
Source PublicationPHYSICAL REVIEW C
ISSN0556-2813
Volume89Issue:1
AbstractThe Ne-18(alpha,p)Na-21 reaction is thought to be one of the key breakout reactions from the hot CNO cycles to the rp process in type I x-ray bursts. In this work, the resonant properties of the compound nucleus Mg-22 have been investigated by measuring the resonant elastic scattering of Na-21 + p. An 89-MeV Na-21 radioactive beam delivered from the CNS Radioactive Ion Beam Separator bombarded an 8.8 mg/cm(2) thick polyethylene (CH2)(n) target. The Na-21 beam intensity was about 2 x 10(5) pps, with a purity of about 70% on target. The recoiled protons were measured at the center-of-mass scattering angles of theta(c.m) approximate to 175.2 degrees, 152.2 degrees, and 150.5 degrees. by three sets of Delta E-E telescopes, respectively. The excitation function was obtained with the thick-target method over energies E-x (Mg-22) = 5.5-9.2 MeV. In total, 23 states above the proton-threshold in Mg-22 were observed, and their resonant parameters were determined via an R-matrix analysis of the excitation functions. We have made several new J(pi) assignments and confirmed some tentative assignments made in previous work. The thermonuclear Ne-18(alpha, p)Na-21 rate has been recalculated based on our recommended spin-parity assignments. The astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the Ne-18(alpha, p)Na-21 rate significantly affects the peak nuclear energy generation rate, reaction fluxes, and onset temperature of this breakout reaction in these astrophysical phenomena.
KeywordAstrophysical Reaction-rates X-ray-bursts Separator Crib Rp-process Nucleosynthesis States Beam Target
Indexed BySCI
Language英语
WOS IDWOS:000332157000004
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/14205
Collection中科院上海应用物理研究所2011-2019年
Corresponding Authorjianjunhe@impcas.ac.cn
Recommended Citation
GB/T 7714
Zhang, LY,He, JJ,Parikh, A,et al. Investigation of the thermonuclear Ne-18(alpha,p)Na-21 reaction rate via resonant elastic scattering of Na-21 + p[J]. PHYSICAL REVIEW C,2014,89(1).
APA Zhang, LY.,He, JJ.,Parikh, A.,Xu, SW.,Yamaguchi, H.,...&jianjunhe@impcas.ac.cn.(2014).Investigation of the thermonuclear Ne-18(alpha,p)Na-21 reaction rate via resonant elastic scattering of Na-21 + p.PHYSICAL REVIEW C,89(1).
MLA Zhang, LY,et al."Investigation of the thermonuclear Ne-18(alpha,p)Na-21 reaction rate via resonant elastic scattering of Na-21 + p".PHYSICAL REVIEW C 89.1(2014).
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