Programme

I.7 -- Invited, VCTP-49

Date: Wednesday, 31 July 2024

Time: 14:00 - 14:40

Imprint of pairing correlation in (n, γ) and Maxwellian-averaged cross sections of an odd-odd 166Ho nucleus

Le Tan Phuc (1), Tran Vu Dong (1), Nguyen Dinh Dang (2), Bui Minh Hue (3), Le Thi Quynh Huong (4), Balaram Dey (5), Nguyen Ngoc Anh (6), Nguyen Quang Hung (1)

(1) Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, Viet Nam (2) Nuclear Many-Body Theory Laboratory, RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Hirosawa, Wako City, Saitama, Japan (3) Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, Viet Nam (4) University of Khanh Hoa, Nha Trang City, Khanh Hoa Province, Viet Nam (5) Department of Physics, Bankura University, West Bengal, India (6) Faculty of Fundamental Science, PHENIKAA University, Yen Nghia, Ha Dong, Hanoi, Viet Nam

The present paper investigates the impact of pairing correlation on the nuclear level density (NLD) and radiative strength function (RSF) of an odd-odd and rare-earth 166Ho nucleus. By employing the exact thermal pairing (EP) solution in conjunction with both the temperature dependent independent-particle model (EP+IPM) for the NLD and the phonon damping model (EP+PDM) for the RSF, we achieve good agreement with the experimental NLD and RSF data, which have been recently extracted by using the Oslo method. Notably, without adding any extra parameters, our calculations successfully reproduce the pygmy dipole resonances (PDR) and a portion of the strength around the region of scissor resonance (SR) in the RSF. This suggests that the SR in this nucleus may be less pronounced than that obtained in the previous analysis within the phenomenological model. These features are the consequences of the EP and the couplings of the PDM phonon to all the particle-hole (ph), particle-particle (pp), and hole-hole (hh) configurations within the EP+PDM, thus insisting on the importance of the underlying physics involved in this model. Utilizing the obtained NLD and RSF, we predict the 165Ho(n, γ)166Ho and Maxwellian-averaged cross sections, which exhibit remarkable agreement with all the available experimental data from the Experimental Nuclear Reaction Data and Karlsruhe Astrophysical Database of Nucleosynthesis in Stars. These results reflect the imprint of the pairing correlation on those quantities [1]. References: [1] Le Tan Phuc, Tran Vu Dong, Nguyen Dinh Dang, Bui Minh Hue, Le Thi Quynh Huong, Balaram Dey, Nguyen Ngoc Anh, Nguyen Quang Hung, Imprint of pairing correlation in (n, γ) and Maxwellian-averaged cross sections of an odd-odd 166Ho nucleus, Phys. Lett. B 849, 138421 (2024).

Presenter: Nguyen Quang Hung