# Maple procedures for the coupling of angular momenta. V. Recoupling coefficients

## Description

Abstract In various fields of physical research, the quantum mechanical description of many-particle processes often requires an explicit transformation of the angular momenta of the subsystems among different coupling schemes. In general, such transformations are given by recoupling coefficients which, consequently, need to be evaluated over and over again in rather different investigations. Here, we present an extension to the Racah program which supports the application and evaluation of general re... Title of program: RACAH Catalogue Id: ADFV_v5_0 [ADOS] Nature of problem In quantum many-particle physics, the calculation of matrix elements often requires the evaluation of recoupling coefficients describing the transformation of different coupling schemes for the (non-active) particles which are not bound to the operator. Usually, these coefficients have first to be simplified algebraically before their actual numerical value can be determined. But although it is known that recoupling coefficients with any number of (integer or half-integer) angular momenta can al ... Versions of this program held in the CPC repository in Mendeley Data ADFV_v1_0; Racah; 10.1016/S0010-4655(97)00032-5 ADFV_v2_0; Racah; 10.1016/S0010-4655(98)00021-6 ADFV_v3_0; RACAH; 10.1016/S0010-4655(00)00234-4 ADFV_v4_0; RACAH; 10.1016/S0010-4655(01)00218-1 ADFV_v5_0; RACAH; 10.1016/S0010-4655(01)00219-3 ADFV_v6_0; RACAH; 10.1016/S0010-4655(02)00591-X ADFV_v7_0; RACAH; 10.1016/S0010-4655(03)00227-3 ADFV_v8_0; RACAH; 10.1016/j.cpc.2004.11.003 ADFV_v9_0; RACAH; 10.1016/j.cpc.2005.12.008 ADFV_v10_0; RACAH; 10.1016/j.cpc.2009.06.018 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)