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arXiv · 2512.02736

Experimental constraints on $γ$-ray strength function of $^{72}$Ga from $^{72}\mathrm{Ga(n,γ)^{72}Ga}$ capture data and reevaluation of Maxwellian-averaged cross sections of $^{71}$Ga

Sajid Ali·Rajkumar Santra·Gautam Gangopahyay
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Abstract

The $γ$-ray strength function of medium-mass neutron rich nuclei $^{72}$Ga has been extracted from the statistical Hauser-Feshbach analysis of the available capture data of $^{71}\mathrm{Ga}(n,γ){}^{72}\mathrm{Ga}$ over the 0.01 - 3 MeV energy range with the required nuclear level density (NLD) of the $^{72}$Ga constraint from the work of R. Santra et al.,[\href{https://doi.org/10.1103/PhysRevC.107.064611}{Physical Review C 107, 064611 (2023)}]. The Gogny D1M model for the E1 and M1 strength functions, including low-energy upbends of $^{72}$Ga nuclei, is experimentally constrained in the present work. Subsequently, the Maxwellian-averaged cross section(MACS) of $^{71}\mathrm{Ga}$ has been reevaluated based on the present $γ$-ray strength function. It is found that the present MACS value at \(kT = 30\) keV is 115.35$^{+11.92}_{-10.44}$ mb, which is consistent with previous work.

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Sajid Ali, Rajkumar Santra, Gautam Gangopahyay. 2025-12-02. Experimental constraints on $γ$-ray strength function of $^{72}$Ga from $^{72}\mathrm{Ga(n,γ)^{72}Ga}$ capture data and reevaluation of Maxwellian-averaged cross sections of $^{71}$Ga. https://arxiv.org/abs/2512.02736

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