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Enhanced $S$-factor for the $^{14}$N$(p,γ)^{15}$O reaction and its impact on the solar composition problem

Fuente: arXiv

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Hauptverfasser:	Chen, X., Su, J., Shen, Y. P., Zhang, L. Y., He, J. J., Chen, S. Z., Wang, S., Shen, Z. L., Lin, S., Song, L. Y., Zhang, H., Wang, L. H., Jiang, X. Z., Wang, L., Huang, Y. T., Qin, Z. W., Liu, F. C., Sheng, Y. D., Chen, Y. J., Lu, Y. L., Li, X. Y., Dong, J. Y., Jiang, Y. C., Zhang, Y. Q., Zhang, Y., Tian, J. W., Xiao, D., Li, Z. M., Han, X. C., Wei, J. J., Li, H., An, Z., Lin, W. P., Liao, B., Liu, H. N., Zhang, F. S., Qiu, M. L., Xu, C., Jin, S. L., Lu, F., Chen, J. F., Nan, W., Wang, Y. B., Li, Z. H., Guo, B., Gu, Y. Q., Liu, W. P.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	Nuclear Experiment Solar and Stellar Astrophysics
Online-Zugang:	Acceder al recurso
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author	Chen, X. Su, J. Shen, Y. P. Zhang, L. Y. He, J. J. Chen, S. Z. Wang, S. Shen, Z. L. Lin, S. Song, L. Y. Zhang, H. Wang, L. H. Jiang, X. Z. Wang, L. Huang, Y. T. Qin, Z. W. Liu, F. C. Sheng, Y. D. Chen, Y. J. Lu, Y. L. Li, X. Y. Dong, J. Y. Jiang, Y. C. Zhang, Y. Q. Zhang, Y. Tian, J. W. Xiao, D. Zhang, Y. Li, Z. M. Han, X. C. Wei, J. J. Li, H. An, Z. Lin, W. P. Liao, B. Liu, H. N. Zhang, F. S. Qiu, M. L. Xu, C. Jin, S. L. Lu, F. Chen, J. F. Nan, W. Wang, Y. B. Li, Z. H. Guo, B. Gu, Y. Q. Liu, W. P.
author_facet	Chen, X. Su, J. Shen, Y. P. Zhang, L. Y. He, J. J. Chen, S. Z. Wang, S. Shen, Z. L. Lin, S. Song, L. Y. Zhang, H. Wang, L. H. Jiang, X. Z. Wang, L. Huang, Y. T. Qin, Z. W. Liu, F. C. Sheng, Y. D. Chen, Y. J. Lu, Y. L. Li, X. Y. Dong, J. Y. Jiang, Y. C. Zhang, Y. Q. Zhang, Y. Tian, J. W. Xiao, D. Zhang, Y. Li, Z. M. Han, X. C. Wei, J. J. Li, H. An, Z. Lin, W. P. Liao, B. Liu, H. N. Zhang, F. S. Qiu, M. L. Xu, C. Jin, S. L. Lu, F. Chen, J. F. Nan, W. Wang, Y. B. Li, Z. H. Guo, B. Gu, Y. Q. Liu, W. P.
contents	The solar composition problem has puzzled astrophysicists for more than 20 years. Recent measurements of carbon-nitrogen-oxygen (CNO) neutrinos by the Borexino experiment show a $\sim2σ$ tension with the "low-metallicity" determinations. $^{14}$N$(p,γ)^{15}$O, the slowest reaction in the CNO cycle, plays a crucial role in the standard solar model (SSM) calculations of CNO neutrino fluxes. Here we report a direct measurement of the $^{14}$N$(p,γ)^{15}$O reaction, in which $S$-factors for all transitions were simultaneously determined in the energy range of $E_p=110-260$ keV for the first time. Our results resolve previous discrepancies in the ground-state transition, yielding a zero-energy $S$-factor $S_{114}(0) = 1.92\pm0.08$ keV b which is 14% higher than the $1.68\pm0.14$ keV b recommended in Solar Fusion III (SF-III). With our $S_{114}$ values, the SSM B23-GS98, and the latest global analysis of solar neutrino measurements, the C and N photospheric abundance determined by the Borexino experiment is updated to $N_{\mathrm{CN}}=({4.45}^{+0.69}_{-0.61})\times10^{-4}$. This new $N_{\mathrm{CN}}$ value agrees well with latest "high-metallicity" composition, however, is also consistent with the "low-metallicity" determination within $\sim 1σ$ C.L., indicating that the solar metallicity problem remains an open question. In addition, the significant reduction in the uncertainty of $S_{114}$ paves the way for the precise determination of the CN abundance in future large-volume solar neutrino measurements.
format	Preprint
id	arxiv_https___arxiv_org_abs_2410_16086
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Enhanced $S$-factor for the $^{14}$N$(p,γ)^{15}$O reaction and its impact on the solar composition problem Chen, X. Su, J. Shen, Y. P. Zhang, L. Y. He, J. J. Chen, S. Z. Wang, S. Shen, Z. L. Lin, S. Song, L. Y. Zhang, H. Wang, L. H. Jiang, X. Z. Wang, L. Huang, Y. T. Qin, Z. W. Liu, F. C. Sheng, Y. D. Chen, Y. J. Lu, Y. L. Li, X. Y. Dong, J. Y. Jiang, Y. C. Zhang, Y. Q. Zhang, Y. Tian, J. W. Xiao, D. Zhang, Y. Li, Z. M. Han, X. C. Wei, J. J. Li, H. An, Z. Lin, W. P. Liao, B. Liu, H. N. Zhang, F. S. Qiu, M. L. Xu, C. Jin, S. L. Lu, F. Chen, J. F. Nan, W. Wang, Y. B. Li, Z. H. Guo, B. Gu, Y. Q. Liu, W. P. Nuclear Experiment Solar and Stellar Astrophysics The solar composition problem has puzzled astrophysicists for more than 20 years. Recent measurements of carbon-nitrogen-oxygen (CNO) neutrinos by the Borexino experiment show a $\sim2σ$ tension with the "low-metallicity" determinations. $^{14}$N$(p,γ)^{15}$O, the slowest reaction in the CNO cycle, plays a crucial role in the standard solar model (SSM) calculations of CNO neutrino fluxes. Here we report a direct measurement of the $^{14}$N$(p,γ)^{15}$O reaction, in which $S$-factors for all transitions were simultaneously determined in the energy range of $E_p=110-260$ keV for the first time. Our results resolve previous discrepancies in the ground-state transition, yielding a zero-energy $S$-factor $S_{114}(0) = 1.92\pm0.08$ keV b which is 14% higher than the $1.68\pm0.14$ keV b recommended in Solar Fusion III (SF-III). With our $S_{114}$ values, the SSM B23-GS98, and the latest global analysis of solar neutrino measurements, the C and N photospheric abundance determined by the Borexino experiment is updated to $N_{\mathrm{CN}}=({4.45}^{+0.69}_{-0.61})\times10^{-4}$. This new $N_{\mathrm{CN}}$ value agrees well with latest "high-metallicity" composition, however, is also consistent with the "low-metallicity" determination within $\sim 1σ$ C.L., indicating that the solar metallicity problem remains an open question. In addition, the significant reduction in the uncertainty of $S_{114}$ paves the way for the precise determination of the CN abundance in future large-volume solar neutrino measurements.
title	Enhanced $S$-factor for the $^{14}$N$(p,γ)^{15}$O reaction and its impact on the solar composition problem
topic	Nuclear Experiment Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2410.16086