Programme

P.67 -- Posters, VCTP-51

Date: Thursday, 6 August 2026

Time: 09:30 - 10:30

Systematic Evaluation of $^{187}\text{W}$ Statistical Properties via Experimental Two-Step γ-Cascade Intensities

Phan Bao Quoc Hieu (1), Pham Ngoc Son (1), Nguyen Xuan Hai (1), Le Tan Phuc (2,3), Nguyen Quang Hung (2,3), Nguyen Ngoc Anh (4)

(1) Dalat Nuclear Research Institute, 01 Nguyen Tu Luc, Lamvien-Dalat ward, Lamdong province, 66124, Vietnam (2) Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 70000, Vietnam (3) Faculty of Natural Sciences, Duy Tan University, Da Nang City, 50000, Vietnam (4) Phenikaa Institute for Advanced Study (PIAS), Phenikaa University, Hanoi City, 12116, Vietnam

Sparse experimental data for the nuclear level density (NLD) and the photon strength function (PSF) of the $^{187}$W isotope require validation of theoretical models critical for fusion research and the production of medical isotopes. We performed a systematic evaluation of 390 model combinations, constrained by experimental two-step gamma-ray cascade (TSC) intensities from the $^{186}$W($n, \gamma$)$^{187}$W reaction and IAEA integral anchors ($D_0, \Gamma_{\gamma}$). Our results demonstrate the superior predictive power of microscopic, temperature-dependent models. Hartree-Fock-Bogoliubov at finite temperature (HFBT) emerged as the most effective NLD model, while microscopic approaches, specifically Goriely’s hybrid and temperature-dependent HFB with D1M Gogny force models, dominated the best performing $E1$ PSF ensemble. The methodology proved robust, successfully diagnosing an unexpected population of a neighboring $7/2^-$ state and identifying significant normalization disparities in existing ($n, \gamma$) cross-section databases. This work underscores the necessity of temperature-dependent microscopic treatments for accurately describing the statistical de-excitation of $^{187}$W and provides a reliable framework for investigating other nuclei with incomplete statistical data.

Presenter: Phan Bao Quoc Hieu