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	Determination of the stellar reaction rate for c-12(alpha, gamma)o-16: using a new expression with the reaction mechanism
	Xu Yi1,2; Xu Wang1; Ma Yu-Gang1; Cai Xiang-Zhou1; Chen Jin-Gen1; Fan Gong-Tao1,2; Fan Guang-Wei1,2; Guo Wei1; Luo Wen1,2; Pan Qiang-Yan1
刊名	Chinese physics b
	2009-04-01
卷号	18期号:4页码:1421-1427
关键词	Nucleosynthesis Thermonuclear reaction rate Stellar evolution Supernovae
ISSN号	1674-1056
通讯作者	Xu yi()
英文摘要	The astrophysical reaction rate of c-12(alpha, gamma)o-16 plays a key role in massive star evolution. however, this reaction rate and its uncertainties have not been well determined yet, especially at t-9=0.2. the existing results even disagree with each other to a certain extent. in this paper, the e1, e2 and total (e1+e2) c-12(alpha, gamma)o-16 reaction rates are calculated in the temperature range from t-9=0.3 to 2 according to all the available cross section data. a new analytic expression of the c-12(alpha, gamma)o-16 reaction rate is brought forward based on the reaction mechanism. in this expression, each part embodies the underlying physics of the reaction. unlike previous works, some physical parameters are chosen from experimental results directly, instead of all the parameters obtained from fitting. these parameters in the new expression, with their 3 sigma fit errors, are obtained from fit to our calculated reaction rate from t-9=0.3 to 2. using the fit results, the analytic expression of c-12(alpha, gamma)o-16 reaction rate is extrapolated down to t-9=0.05 based on the underlying physics. the c-12(alpha, gamma)o-16 reaction rate at t-9=0.2 is (8.78 +/- 1.52) x 10(15) cm(3)s(-1) mol(-1). some comparisons and discussions about our new c-12(alpha, gamma)o-16 reaction rate are presented, and the contributions of the reaction rate correspond to the different part of reaction mechanism are given. the agreements of the reaction rate below t-9=2 between our results and previous works indicate that our results are reliable, and they could be included in the astrophysical reaction rate network. furthermore, we believe our method to investigate the c-12(alpha, gamma)o-16 reaction rate is reasonable, and this method can also be employed to study the reaction rate of other astrophysical reactions. finally, a new constraint of the supernovae production factor of some isotopes are illustrated according to our c-12(alpha, gamma)o-16 reaction rates.
WOS关键词	THERMONUCLEAR REACTION-RATES ; C-12(ALPHA,GAMMA)O-16 CROSS-SECTION ; ASTROPHYSICAL REACTION-RATES ; DELAYED ALPHA-SPECTRUM ; LOW ENERGIES ; NUCLEAR-REACTIONS ; CAPTURE REACTION ; MASSIVE STARS ; KEY REACTION ; NUCLEOSYNTHESIS
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000264290900023
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2400918
专题	中国科学院大学
通讯作者	Xu Yi
作者单位	1.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Xu Yi,Xu Wang,Ma Yu-Gang,et al. Determination of the stellar reaction rate for c-12(alpha, gamma)o-16: using a new expression with the reaction mechanism[J]. Chinese physics b,2009,18(4):1421-1427.
APA	Xu Yi.,Xu Wang.,Ma Yu-Gang.,Cai Xiang-Zhou.,Chen Jin-Gen.,...&Yang Li-Feng.(2009).Determination of the stellar reaction rate for c-12(alpha, gamma)o-16: using a new expression with the reaction mechanism.Chinese physics b,18(4),1421-1427.
MLA	Xu Yi,et al."Determination of the stellar reaction rate for c-12(alpha, gamma)o-16: using a new expression with the reaction mechanism".Chinese physics b 18.4(2009):1421-1427.

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