Approximation of Sums of Experimental Radiative Strength Functions of Dipole Gamma-Transitions in the Region $E_\gamma \approx B_n$ for the Atomic Masses $40 \leq a \leq 200$

TL;DR

This paper accurately approximates the sums of radiative strength functions of dipole gamma-transitions near the neutron binding energy for various nuclei, revealing their dependence on nuclear structure.

Contribution

It introduces a method to approximate the sums of radiative strength functions using two independent functions across multiple nuclei, highlighting their structural dependence.

Findings

High-precision approximation of gamma-strength sums

Dependence on nuclear structure up to neutron binding energy

Applicable to a wide range of nuclei from 40K to 200Hg

Abstract

The sums k(E1)+k(M1) of radiative strength functions of dipole primary gamma-transitions were approximated with high precision in the energy region of $0.5 < E_1 < B_n-0.5$ MeV for nuclei: 40K, 60Co, 71,74Ge, 80Br, 114Cd, 118Sn, 124,125Te, 128I, 137,138,139Ba, 140La, 150Sm, 156,158Gd, 160Tb, 163,164,165Dy, 166Ho, 168Er, 170Tm, 174Yb, 176,177Lu, 181Hf, 182Ta, 183,184,185,187W, 188,190,191,193Os, 192Ir, 196Pt, 198Au, 200Hg by sum of two independent functions. It has been shown that this parameter of gamma-decay are determined by the structure of the decaying and excited levels, at least, up to the neutron binding energy.