Programme

P.59 -- Posters, VCTP-51

Date: Thursday, 6 August 2026

Time: 09:30 - 10:30

Observation of the magnetic dipole scissors resonance in 182Ta(n,2γ) experiment

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

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

The persistence of the magnetic dipole (M1) scissors resonance (SR) in odd-odd deformed nuclei is debated. To resolve this, we performed 182Ta(n,2γ) experiment using the thermal neutron beam of the Dalat Nuclear Research Reactor to measure the two-step γ-cascade (TSC) intensity distributions of 182Ta. Using the measured data and a locally scaled, multi-model evaluation framework, we deconvoluted the electric (E1) and magnetic (M1) dipole photon strength functions. Our results reveal a prominent SR peak near 2.5 MeV in 182Ta, confirming that the collective SR remains robust despite valence nucleon pairing. We demonstrate that previous studies using the Oslo method likely missed this feature due to signal convolution, where the M1 peak was masked by an dominant E1 background. In addition, our analysis constrains the three datasets available from the Oslo method to one that was normalized using the Hartree-Fock-Bogoliubov model.

Presenter: Nguyen Ngoc Anh