New measurement of $^{51}$V($γ$,1n) cross section through the refined monochromatic cross section extraction method
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912718826504192 |
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| author | Hao, Zi-Rui Fan, Gong-Tao Sun, Qian-Kun Wang, Hong-Wei Xu, Hang-Hua Liu, Long-Xiang Zhang, Yue Yang, Yu-Xuan Chen, Kai-Jie Li, Zhi-Cai Jiao, Pu Zhou, Meng-Die Ye, Shan Wang, Zhen-Wei Wang, Xiang-Fei Xu, Meng-Ke Shen, Yu-Long Yang, Chang Ding, Jia-Wen |
| author_facet | Hao, Zi-Rui Fan, Gong-Tao Sun, Qian-Kun Wang, Hong-Wei Xu, Hang-Hua Liu, Long-Xiang Zhang, Yue Yang, Yu-Xuan Chen, Kai-Jie Li, Zhi-Cai Jiao, Pu Zhou, Meng-Die Ye, Shan Wang, Zhen-Wei Wang, Xiang-Fei Xu, Meng-Ke Shen, Yu-Long Yang, Chang Ding, Jia-Wen |
| contents | The Giant Dipole Resonance (GDR) in $^{51}$V has been a long-term conflicting interpretation, with existing photoneutron cross section data suggesting either a single peak or a pronounced splitting, leading to opposite conclusions on nuclear deformation. A new measurement of the $^{51}$V($γ$,1n) cross section, performed at the Shanghai Laser Electron Gamma Source (SLEGS) facility, employs a refined monochromatic cross section extraction method. By integrating Polynomial Regression and Support Vector Regression (SVR) for robust interpolation and extrapolation, the new extracted monoenergetic cross sections exhibit a single, broad peak with no evidence of GDR splitting. This result provides new support for a spherical or near-spherical shape of $^{51}$V. Furthermore, we found that deliberately overfitting the data using an SVR model reproduces multi-peak structures similar to those reported in historical datasets, implying that the previously claimed splitting might originated from analysis artifacts rather than physical phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_15353 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | New measurement of $^{51}$V($γ$,1n) cross section through the refined monochromatic cross section extraction method Hao, Zi-Rui Fan, Gong-Tao Sun, Qian-Kun Wang, Hong-Wei Xu, Hang-Hua Liu, Long-Xiang Zhang, Yue Yang, Yu-Xuan Chen, Kai-Jie Li, Zhi-Cai Jiao, Pu Zhou, Meng-Die Ye, Shan Wang, Zhen-Wei Wang, Xiang-Fei Xu, Meng-Ke Shen, Yu-Long Yang, Chang Ding, Jia-Wen Nuclear Experiment The Giant Dipole Resonance (GDR) in $^{51}$V has been a long-term conflicting interpretation, with existing photoneutron cross section data suggesting either a single peak or a pronounced splitting, leading to opposite conclusions on nuclear deformation. A new measurement of the $^{51}$V($γ$,1n) cross section, performed at the Shanghai Laser Electron Gamma Source (SLEGS) facility, employs a refined monochromatic cross section extraction method. By integrating Polynomial Regression and Support Vector Regression (SVR) for robust interpolation and extrapolation, the new extracted monoenergetic cross sections exhibit a single, broad peak with no evidence of GDR splitting. This result provides new support for a spherical or near-spherical shape of $^{51}$V. Furthermore, we found that deliberately overfitting the data using an SVR model reproduces multi-peak structures similar to those reported in historical datasets, implying that the previously claimed splitting might originated from analysis artifacts rather than physical phenomena. |
| title | New measurement of $^{51}$V($γ$,1n) cross section through the refined monochromatic cross section extraction method |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2511.15353 |