Chinese Physics C > 2016, Vol. 40 > Issue(12): 125101 DOI: 10.1088/1674-1137/40/12/125101

Reevaluation of thermonuclear reaction rate of⁵⁰Fe(p, γ)⁵¹Co

1.
College of Physics and Electronic Information Engineering, Chifeng University, Chifeng 024000, China
2.
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
3.
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China

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Abstract：
The thermonuclear rate of the ⁵⁰Fe(p, γ) ⁵¹Co reaction in the Type I X-ray bursts (XRBs) temperature range has been reevaluated based on a recent precise mass measurement at CSRe Lanzhou, where the proton separation energy S _p=142±77 keV has been determined firstly for the ⁵¹Co nucleus. Comparing to the previous theoretical predictions, the experimental S _pvalue has much smaller uncertainty. Based on the nuclear shell model and mirror nuclear structure information, we have calculated two sets of thermonuclear rates for the ⁵⁰Fe(p, γ) ⁵¹Co reaction by utilizing the experimental S _pvalue. It shows that the statistical-model calculations are not ideally applicable for this reaction primarily because of the low density of low-lying excited states in ⁵¹Co. In this work, we recommend that a set of new reaction rates based on the mirror structure of ⁵¹Cr should be incorporated in future astrophysical network calculations.
- X-ray burst (XRB),
- nucleosynthesis,
- mass measurement,
- proton separation energy,
- reaction rate

References

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Li-Ping Zhang, Jian-Jun He, Wan-Dong Chai, Su-Qing Hou and Li-Yong Zhang. Reevaluation of thermonuclear reaction rate of ⁵⁰Fe(p, γ) ⁵¹Co[J]. Chinese Physics C, 2016, 40(12): 125101. doi: 10.1088/1674-1137/40/12/125101

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Received: 2016-07-25
Revised: 2016-09-19

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Supported by Natural Science Foundation of Inner Mongolia Autonomous Region of China (2013MS0916) and National Natural Science Foundation of China (11490562, 11405228)

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Reevaluation of thermonuclear reaction rate of⁵⁰Fe(p, γ)⁵¹Co

Corresponding author:Jian-Jun He,hejianjun@nao.cas.cn

1. College of Physics and Electronic Information Engineering, Chifeng University, Chifeng 024000, China
2. Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
3. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China

Received Date:2016-07-25
Accepted Date:2016-09-19
Available Online:2016-12-05

Fund Project:Supported by Natural Science Foundation of Inner Mongolia Autonomous Region of China (2013MS0916) and National Natural Science Foundation of China (11490562, 11405228)

Abstract:The thermonuclear rate of the⁵⁰Fe(p, γ)⁵¹Co reaction in the Type I X-ray bursts (XRBs) temperature range has been reevaluated based on a recent precise mass measurement at CSRe Lanzhou, where the proton separation energyS_p=142±77 keV has been determined firstly for the⁵¹Co nucleus. Comparing to the previous theoretical predictions, the experimentalS_pvalue has much smaller uncertainty. Based on the nuclear shell model and mirror nuclear structure information, we have calculated two sets of thermonuclear rates for the⁵⁰Fe(p, γ)⁵¹Co reaction by utilizing the experimentalS_pvalue. It shows that the statistical-model calculations are not ideally applicable for this reaction primarily because of the low density of low-lying excited states in⁵¹Co. In this work, we recommend that a set of new reaction rates based on the mirror structure of⁵¹Cr should be incorporated in future astrophysical network calculations.