# Perturbation functions: PAC probe nuclei, I = 2, 5 2 , and 3

## Description

Abstract The program, ACOEFF, calculates several theoretical quantities that are useful for analyzing Perturbed Angular Correlation (PAC) experiments. In particular, ACOEFF calculates perturbation functions, G_(k k)(t), a(^k )_(n, n')-coefficients, and interaction frequencies for nuclear electric quadrupole interactions of PAC probe nuclei with non-axially symmetric electric field gradients. The program calculates these quantities for the specific cases of spin, I = 2, 5 2, and 3, for polycrystall... Title of program: ACOEFF Catalogue Id: ABJM_v1_0 Nature of problem In Perturbed Angular Correlation (PAC) Spectroscopy, static nuclear- electric-quadrupole interactions are described by perturbation functions (attenuation coefficients). For a quadrupole interaction with a non- axially-symmetric electric field gradient, the perturbation function calculation involves a summation over projection quantum numbers, Wigner 3-j coefficients, and the associated unitary matrix elements. Versions of this program held in the CPC repository in Mendeley Data ABJM_v1_0; ACOEFF; 10.1016/0010-4655(89)90066-0 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)