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Examination of the Astrophysical-Rate Variations of the Key Reactions in the rp-Process due to Mass Uncertainties
Journal of the Korean Physical Society ( IF 0.6 ) Pub Date : 2020-05-01 , DOI: 10.3938/jkps.76.881
Nguyen Ngoc Duy , Phuong-Thao Ho , Nguyen Kim Uyen

We report on the variations of the astrophysical rates due to mass uncertainties of the exotic nuclei in rp-process reactions. With the current mass precision obtained in the AME2016 database, only the 71Br(p, γ)72Kr and the 65AS(p, γ)66Se reactions have rate uncertainties of about 10% - 20% at T9 = 0.5 while the 61Ga(p, γ)62Ge, 61,64,65Ge(p, γ)62,65,66As, 68,69Se(p, γ)69,70Br, 69,70Br(p, γ)70,71Kr, and 75Rb(p, γ)76Sr reactions have large uncertainties of more than 50%. If an uncertainty of 10% at T9 = 1.0 is to be achieved, the mass precisions for the isotopes must be less than 10 keV. Evaluations of the photodisintegrations corresponding to proton captures and β+ decays of the waiting points, 64Ge and 68Se, indicate that the orientation of the nucleosynthesis at these waiting points is still unknown due to the large astrophysical rate variations because of the mass uncertainties of the 65As and the 69Br isotopes. The astrophysical rate variations corresponding to the mass precision levels at specific temperatures are presented in this work.

中文翻译:

由于质量不确定性对 rp 过程中关键反应的天体物理速率变化的检查

我们报告了由于 rp 过程反应中奇异核的质量不确定性而导致的天体物理速率的变化。根据 AME2016 数据库中获得的当前质量精度,只有 71Br(p, γ)72Kr 和 65AS(p, γ)66Se 反应在 T9 = 0.5 时具有约 10% - 20% 的速率不确定性,而 61Ga(p, γ)62Ge, 61,64,65Ge(p, γ)62,65,66As, 68,69Se(p, γ)69,70Br, 69,70Br(p, γ)70,71Kr, 和 75Rb(p, γ) )76Sr 反应具有超过 50% 的较大不确定性。如果要在 T9 = 1.0 时达到 10% 的不确定度,同位素的质量精度必须小于 10 keV。对应于等待点 64Ge 和 68Se 的质子捕获和 β+ 衰变的光解体评估,表明由于 65As 和 69Br 同位素的质量不确定性,天体物理速率变化很大,因此这些等待点的核合成方向仍然未知。这项工作介绍了与特定温度下质量精度水平相对应的天体物理速率变化。
更新日期:2020-05-01
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