학술논문
Deep underground laboratory measurement of $^{13}$C($\alpha$,$n$)$^{16}$O in the Gamow windows of the $s$- and $i$-processes
Document Type
Working Paper
Author
Gao, B.; Jiao, T. Y.; Li, Y. T.; Chen, H.; Lin, W. P.; An, Z.; Ru, L. H.; Zhang, Z. C.; Tang, X. D.; Wang, X. Y.; Zhang, N. T.; Fang, X.; Xie, D. H.; Fan, Y. H.; Ma, L.; Zhang, X.; Bai, F.; Wang, P.; Fan, Y. X.; Liu, G.; Huang, H. X.; Wu, Q.; Zhu, Y. B.; Chai, J. L.; Li, J. Q.; Sun, L. T.; Wang, S.; Cai, J. W.; Li, Y. Z.; Su, J.; Zhang, H.; Li, Z. H.; Li, Y. J.; Li, E. T.; Chen, C.; Shen, Y. P.; Lian, G.; Guo, B.; Li, X. Y.; Zhang, L. Y.; He, J. J.; Sheng, Y. D.; Chen, Y. J.; Wang, L. H.; Zhang, L.; Cao, F. Q.; Nan, W.; Nan, W. K.; Li, G. X.; Song, N.; Cui, B. Q.; Chen, L. H.; Ma, R. G.; Yan, S. Q.; Liao, J. H.; Wang, Y. B.; Zeng, S.; Nan, D.; Fan, Q. W.; Qi, N. C.; Sun, W. L.; Guo, X. Y.; Zhang, P.; Chen, Y. H.; Zhou, Y.; Zhou, J. F.; He, J. R.; Shang, C. S.; Li, M. C.; Kubono, S.; Liu, W. P.; deBoer, R. J.; Wiescher, M.; Pignatari, M.
Source
Physical Review Letters 129, 132701 (2022)
Subject
Language
Abstract
The $^{13}$C($\alpha$,$n$)$^{16}$O reaction is the main neutron source for the slow-neutron-capture (s-) process in Asymptotic Giant Branch stars and for the intermediate (i-) process. Direct measurements at astrophysical energies in above-ground laboratories are hindered by the extremely small cross sections and vast cosmic-ray induced background. We performed the first consistent direct measurement in the range of $E_{\rm c.m.}=$0.24 MeV to 1.9 MeV using the accelerators at the China Jinping Underground Laboratory (CJPL) and Sichuan University. Our measurement covers almost the entire i-process Gamow window in which the large uncertainty of the previous experiments has been reduced from 60\% down to 15\%, eliminates the large systematic uncertainty in the extrapolation arising from the inconsistency of existing data sets, and provides a more reliable reaction rate for the studies of the s- and i-processes along with the first direct determination of the alpha strength for the near-threshold state.