New measurement of 51V(γ,1n) cross section through the refined monochromatic cross section extraction method.
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| Title: | New measurement of 51V(γ,1n) cross section through the refined monochromatic cross section extraction method. |
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| Authors: | Hao, Zi-Rui1 (AUTHOR), Fan, Gong-Tao1,2,3 (AUTHOR) fangt@sari.ac.cn, Chen, Chen4,5 (AUTHOR), Sun, Qian-Kun2 (AUTHOR), Wang, Hong-Wei1,2,3 (AUTHOR), Niu, Yi-Fei4,5 (AUTHOR), Xu, Hang-Hua1,3 (AUTHOR), Liu, Long-Xiang1 (AUTHOR), Zhang, Yue1 (AUTHOR), Yang, Yu-Xuan2 (AUTHOR), Chen, Kai-Jie2 (AUTHOR), Li, Zhi-Cai1 (AUTHOR), Jiao, Pu1 (AUTHOR), Zhou, Meng-Die1 (AUTHOR), Ye, Shan1 (AUTHOR), Wang, Zhen-Wei2 (AUTHOR), Wang, Xiang-Fei2 (AUTHOR), Xu, Meng-Ke2 (AUTHOR), Shen, Yu-Long1 (AUTHOR), Yang, Chang1 (AUTHOR) |
| Source: | Physics Letters B. May2026, Vol. 876, pN.PAG-N.PAG. 1p. |
| Subjects: | Vanadium, Nuclear cross sections, Nuclear shapes, Regression analysis, Support vector machines, Laboratories |
| Abstract: | The Giant Dipole Resonance (GDR) in 51V 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 51V(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. Re-analysis of the reported splitting shows that any deformation extracted from such a structure would be relatively weaker than those of neighboring nuclei, providing a support for a spherical or near-spherical shape of 51V. 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. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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