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arXiv · 2604.24220

Precision extraction of the deuteron electric polarizability via the Baldin sum rule with full low-energy coverage

Zi-Rui Hao·Gong-Tao Fan·Qian-Kun Sun·Hong-Wei Wang·Hang-Hua Xu·Long-Xiang Liu·Yue Zhang·Jiunn-Wei Chen·Yu-Xuan Yang·Sheng Jin·Kai-Jie Chen·Zhen-Wei Wang·Xiang-Fei Wang·Meng-Ke Xu·Zhi-Cai Li·Pu Jiao·Meng-Die Zhou·Shan Ye·Yu-Long Shen·Yin-Ji Chen·Hao Zhang·Jian-Jun He·Wen-Qing Shen·Yu-Gang Ma
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Abstract

The photodisintegration cross sections of the deuteron have been systematically measured over the photon energy range of 2.33-19.65 MeV at the Shanghai Laser Electron Gamma Source (SLEGS). By applying the well-established Baldin sum rule to the newly obtained data, the sum of the electric and magnetic dipole polarizabilities of the deuteron is extracted for the first time based solely on a dense and continuous experimental dataset, yielding αE +\{beta}M = 0.719\pm0.009stat\pm0.014algo\pm0.023syst fm3 . With theoretical values of the magnetic polarizability \{beta}M calculated from the pionless effective field theory, a new value of the electric polarizability is obtained as αE = 0.637 \pm 0.009stat \pm 0.014algo \pm 0.023syst \pm 0.004theo fm3 , which is in excellent agreement with current theoretical predictions. This result resolves the previous discrepancy between experimental measurements from elastic scattering and theory, providing a high-precision benchmark for nuclear interaction models.

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Zi-Rui Hao, Gong-Tao Fan, Qian-Kun Sun, Hong-Wei Wang, Hang-Hua Xu, Long-Xiang Liu, Yue Zhang, Jiunn-Wei Chen, Yu-Xuan Yang, Sheng Jin, Kai-Jie Chen, Zhen-Wei Wang, Xiang-Fei Wang, Meng-Ke Xu, Zhi-Cai Li, Pu Jiao, Meng-Die Zhou, Shan Ye, Yu-Long Shen, Yin-Ji Chen, Hao Zhang, Jian-Jun He, Wen-Qing Shen, Yu-Gang Ma. 2026-04-27. Precision extraction of the deuteron electric polarizability via the Baldin sum rule with full low-energy coverage. https://doi.org/10.1103/xmmq-gnvq

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