arXiv · 1809.02980
Experimentally well-constrained masses of $^{27}$P and $^{27}$S: Implications for studies of explosive binary systems
Abstract
The mass of $^{27}$P was predicted to impact the X-ray burst (XRB) model predictions of burst light curves and the composition of the burst ashes. To address the uncertainties and inconsistencies in the reported $^{27}$P masses in literature, a wealth of information has been extracted from the $β$-decay spectroscopy of the drip-line nucleus $^{27}$S. We determine the most precise mass excess of $^{27}$P to date to be $-659(9)$~keV, which is 63~keV (2.3$σ$) higher than the AME2016 recommended value of $-722(26)$~keV. The experimentally unknown mass excess of $^{27}$S was estimated to be 17030(400)~keV in AME2016, and we constrain this mass to be 17678(77)~keV based on the measured $β$-delayed two-proton energy. In the temperature region of $(0.06-0.3)$~GK, the $^{26}$Si$(p,γ)^{27}$P reaction rate determined in this work is significantly lower than the rate recommended in the reaction rate libraries, up to two orders of magnitude around 0.1~GK. The impact of these newly determined masses and well-constrained rate on the modeling of the explosive astrophysical scenarios has been explored by hydrodynamic nova and post-processing XRB models. No substantial change was found in the nova contribution to the synthesis of galactic $^{26}$Al or in the XRB energy generation rate, but we found that the calculated abundances of $^{26}$Al and $^{26}$Si at the last stage of XRB are increased by a factor of 2.4. We also conclude that $^{27}$S is not a significant waiting point in the rapid proton capture process.
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L. J. Sun, X. X. Xu, S. Q. Hou, C. J. Lin, J. José, J. Lee, J. J. He, Z. H. Li, J. S. Wang, C. X. Yuan, F. Herwig, J. Keegans, T. Budner, D. X. Wang, H. Y. Wu, P. F. Liang, Y. Y. Yang, Y. H. Lam, P. Ma, F. F. Duan, Z. H. Gao, Q. Hu, Z. Bai, J. B. Ma, J. G. Wang, F. P. Zhong, C. G. Wu, D. W. Luo, Y. Jiang, Y. Liu, D. S. Hou, R. Li, N. R. Ma, W. H. Ma, G. Z. Shi, G. M. Yu, D. Patel, S. Y. Jin, Y. F. Wang, Y. C. Yu, Q. W. Zhou, P. Wang, L. Y. Hu, X. Wang, H. L. Zang, P. J. Li, Q. Q. Zhao, L. Yang, P. W. Wen, F. Yang, H. M. Jia, G. L. Zhang, M. Pan, X. Y. Wang, H. H. Sun, Z. G. Hu, R. F. Chen, M. L. Liu, W. Q. Yang, Y. M. Zhao, H. Q. Zhang. 2019-10-13. Experimentally well-constrained masses of $^{27}$P and $^{27}$S: Implications for studies of explosive binary systems. https://doi.org/10.1016/j.physletb.2020.135213
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