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Determination of the stellar reaction rate for (12)C(alpha, gamma)(16)O: using a new expression with the reaction mechanism
Xu, Y(徐毅); Xu, W(徐望); Ma, YG(马余刚); Cai, XZ(蔡翔舟); Chen, JG(陈建辉); Fan, GT(樊功涛); Fan, GW(樊广伟); Guo, W(郭威); Luo, W; Pan, QY(潘强岩); Shen, WQ(沈文庆); Yang, LF(杨利峰); Xu, Y (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
2009
Source PublicationCHINESE PHYSICS B
ISSN1674-1056
Volume18Issue:4Pages:7
AbstractThe astrophysical reaction rate of (12)C(alpha, gamma)(16)O 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) (12)C(alpha, gamma)(16)O 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 (12)C(alpha, gamma)(16)O 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 (12)C(alpha, gamma)(16)O reaction rate is extrapolated down to T(9)=0.05 based on the underlying physics. The (12)C(alpha, gamma)(16)O 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 (12)C(alpha, gamma)(16)O 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 (12)C(alpha, gamma)(16)O 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 (12)C(alpha, gamma)(16)O reaction rates.
KeywordNucleosynthesis Thermonuclear Reaction Rate Stellar Evolution Supernovae
Subject AreaPhysics
Indexed BySCI
Language英语
Funding Project应物所项目组
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/6884
Collection中科院上海应用物理研究所2004-2010年
Corresponding AuthorXu, Y (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
Recommended Citation
GB/T 7714
Xu, Y,Xu, W,Ma, YG,et al. Determination of the stellar reaction rate for (12)C(alpha, gamma)(16)O: using a new expression with the reaction mechanism[J]. CHINESE PHYSICS B,2009,18(4):7.
APA Xu, Y.,Xu, W.,Ma, YG.,Cai, XZ.,Chen, JG.,...&Xu, Y .(2009).Determination of the stellar reaction rate for (12)C(alpha, gamma)(16)O: using a new expression with the reaction mechanism.CHINESE PHYSICS B,18(4),7.
MLA Xu, Y,et al."Determination of the stellar reaction rate for (12)C(alpha, gamma)(16)O: using a new expression with the reaction mechanism".CHINESE PHYSICS B 18.4(2009):7.
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