High-Precision Measurement of D($γ$, $n$)$p$ Photodisintegration Reaction and Implications for Big-Bang Nucleosynthesis
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Chen, Yinji Hao, Zirui He, Jianjun Kajino, Toshitaka Ando, Shung-ichi Luo, Yudong Feng, Hongrui Zhang, Liyong Fan, Gongtao Wang, Hongwei Zhang, Hao Shen, Zhilin Liu, Longxiang Xu, Hanghua Zhang, Yue Jiao, Pu Li, Xinyue Yang, Yuxuan Jin, Sheng Chen, Kaijie Shen, Wenqing Ma, Yugang |
| author_facet | Chen, Yinji Hao, Zirui He, Jianjun Kajino, Toshitaka Ando, Shung-ichi Luo, Yudong Feng, Hongrui Zhang, Liyong Fan, Gongtao Wang, Hongwei Zhang, Hao Shen, Zhilin Liu, Longxiang Xu, Hanghua Zhang, Yue Jiao, Pu Li, Xinyue Yang, Yuxuan Jin, Sheng Chen, Kaijie Shen, Wenqing Ma, Yugang |
| contents | We report on a high-precision measurement of the D($γ$,\,$n$)$p$ photodisintegration reaction at the newly commissioned Shanghai Laser Electron Gamma Source (SLEGS), employing a quasi-monochromatic $γ$-ray beam from Laser Compton Scattering. The cross sections were determined over $E_γ$=2.327--7.089 MeV, achieving up to a factor of 2.2 improvement in precision near the neutron separation threshold. Combined with previous data in a global Markov chain Monte Carlo (MCMC) analysis using dibaryon effective field theory, we obtained the unprecedentedly precise $p$($n$,\,$γ$)D cross sections and thermonuclear rate, with a precision up to $\approx$4 times higher than previous evaluations. Implemented in a standard Big-Bang Nucleosynthesis (BBN) framework, this new rate decreases uncertainty of the key cosmological parameter of baryon density $Ω_b h^2$ by up to $\approx$16\% relative to the LUNA result. A residual $\approx$1.2$σ$ tension between $Ω_b h^2$ constrained from primordial D/H observations and CMB measurements persists, highlighting the need for improved $dd$ reaction rates and offering potential hints of new physics beyond the standard model of cosmology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_11743 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-Precision Measurement of D($γ$, $n$)$p$ Photodisintegration Reaction and Implications for Big-Bang Nucleosynthesis Chen, Yinji Hao, Zirui He, Jianjun Kajino, Toshitaka Ando, Shung-ichi Luo, Yudong Feng, Hongrui Zhang, Liyong Fan, Gongtao Wang, Hongwei Zhang, Hao Shen, Zhilin Liu, Longxiang Xu, Hanghua Zhang, Yue Jiao, Pu Li, Xinyue Yang, Yuxuan Jin, Sheng Chen, Kaijie Shen, Wenqing Ma, Yugang Nuclear Experiment Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics We report on a high-precision measurement of the D($γ$,\,$n$)$p$ photodisintegration reaction at the newly commissioned Shanghai Laser Electron Gamma Source (SLEGS), employing a quasi-monochromatic $γ$-ray beam from Laser Compton Scattering. The cross sections were determined over $E_γ$=2.327--7.089 MeV, achieving up to a factor of 2.2 improvement in precision near the neutron separation threshold. Combined with previous data in a global Markov chain Monte Carlo (MCMC) analysis using dibaryon effective field theory, we obtained the unprecedentedly precise $p$($n$,\,$γ$)D cross sections and thermonuclear rate, with a precision up to $\approx$4 times higher than previous evaluations. Implemented in a standard Big-Bang Nucleosynthesis (BBN) framework, this new rate decreases uncertainty of the key cosmological parameter of baryon density $Ω_b h^2$ by up to $\approx$16\% relative to the LUNA result. A residual $\approx$1.2$σ$ tension between $Ω_b h^2$ constrained from primordial D/H observations and CMB measurements persists, highlighting the need for improved $dd$ reaction rates and offering potential hints of new physics beyond the standard model of cosmology. |
| title | High-Precision Measurement of D($γ$, $n$)$p$ Photodisintegration Reaction and Implications for Big-Bang Nucleosynthesis |
| topic | Nuclear Experiment Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2509.11743 |