The Breaking Thresholds of Cooper Nucleon Pairs and Features of the Decay of 172Yb Nucleus in the 171Yb(nth,2γ) Reaction

Anh Nguyen N., Hai Nguyen X., Khang Phan D., Vu D.C., Mitsyna L.V.,
Sukhovoj A.M.

For the purpose of enhancement of the experimental data set on the cascade intensities of two gamma quanta emitted step by step after radiative capture of the thermal neutrons, the 171Yb(nth,2γ)-reaction was investigated. In the analysis of the cascade intensities the structure change of the observed levels of the 172Yb nucleus was discovered depending on the excitation energy, and the probable breaking thresholds were obtained for four Cooper pairs of neutrons below neutron binding energy.