Mass measurements show slowdown of rapid proton capture process at waiting-point nucleus 64Ge

Zhou, X.; Wang, M.; Zhang, Y. H.; Litvinov, Yu. A.; Meisel, Z.; Blaum, K.; Zhou, X. H.; Hou, S. Q.; Li, K. A.; Xu, H. S.; Chen, R. J.; Deng, H. Y.; Fu, C. Y.; Ge, W. W.; He, J. J.; Huang, W. J.; Jiao, H. Y.; Li, H. F.; Li, J. G.; Liao, T.; Litvinov, S. A.; Liu, M. L.; Niu, Y. F.; Shuai, P.; Shi, J. Y.; Song, Y. N.; Sun, M. Z.; Wang, Q.; Xing, Y. M.; Xu, X.; Xu, F. R.; Yan, X. L.; Yang, J. C.; Yu, Y.; Yuan, Q.; Yuan, Y. J.; Zeng, Q.; Zhang, M.; Zhang, S.

doi:10.1038/s41567-023-02034-2

Title: Mass measurements show slowdown of rapid proton capture process at waiting-point nucleus 64Ge

Journal Article · 01 May 2023 · Nature Physics

DOI: https://doi.org/10.1038/s41567-023-02034-2 · OSTI ID:1972025

Zhou, X.;

;

; Meisel, Z.;

; Zhou, X. H.;

; Li, K. A.; Xu, H. S.; Chen, R. J.; Deng, H. Y.; Fu, C. Y.; Ge, W. W.;

;

; Jiao, H. Y.; Li, H. F.; Li, J. G.; Liao, T. more »

Abstract X-ray bursts are among the brightest stellar objects frequently observed in the sky by space-based telescopes. A type-I X-ray burst is understood as a violent thermonuclear explosion on the surface of a neutron star, accreting matter from a companion star in a binary system. The bursts are powered by a nuclear reaction sequence known as the rapid proton capture process (rp process), which involves hundreds of exotic neutron-deficient nuclides. At so-called waiting-point nuclides, the process stalls until a slower β ⁺ decay enables a bypass. One of the handful of rp process waiting-point nuclides is ⁶⁴ Ge, which plays a decisive role in matter flow and therefore the produced X-ray flux. Here we report precision measurements of the masses of ⁶³ Ge, ^64,65 As and ^66,67 Se—the relevant nuclear masses around the waiting-point ⁶⁴ Ge—and use them as inputs for X-ray burst model calculations. We obtain the X-ray burst light curve to constrain the neutron-star compactness, and suggest that the distance to the X-ray burster GS 1826–24 needs to be increased by about 6.5% to match astronomical observations. The nucleosynthesis results affect the thermal structure of accreting neutron stars, which will subsequently modify the calculations of associated observables.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-88ER40387; SC0019042

OSTI ID:: 1972025

Journal Information:: Nature Physics, Journal Name: Nature Physics Vol. 19 Journal Issue: 8; ISSN 1745-2473

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: France

Language:: English

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