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Method simplifying calculation of coecients of fractional parentage for translationally invariant

Saulius Mickevi, Darius Germanas, R.K. Kalinauskas

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

A new procedure for large-scale calculations of the coecients of fractional parentage (CFP) for manyparticle systems is presented. The approach is based on a simple enumeration scheme for antisymmetric N particle states, and we suggest an ecient method for constructing the eigenvectors of two-particle transposition operator PN1;N in a subspace where N1 and N2 = N N1 nucleons basis states are already antisymmetrized. The main result of this paper is that according to permutation operators PN1;N eigenvalues we can distinguish totally asymmetrical N particle states from the other states with lower degree of asymmetry.

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A new procedure for large-scale calculations of the coecients of fractional parentage (CFP) for manyparticle systems is presented. The approach is based on a simple enumeration scheme for antisymmetric N particle states, and we suggest an ecient method for constructing the eigenvectors of two-particle transposition operator PN1;N in a subspace where N1 and N2 = N N1 nucleons basis states are already antisymmetrized. The main result of this paper is that according to permutation operators PN1;N eigenvalues we can distinguish totally asymmetrical N particle states from the other states with lower degree of asymmetry.
Abstract A new procedure for large-scale calculations of the coefficients of fractional parentage (CFP) for many-particle systems is presented. The approach is based on a simple enumeration scheme for antisymmetric N particle states, and we suggest an efficient method for constructing the eigenvectors of two-particle transposition operator PN1,NP_{N_1 ,N}PN1​,N​ in a subspace where N 1 and N 2 = N − N 1 nucleons basis states are already antisymmetrized. The main result of this paper is that according to permutation operators PN1,NP_{N_1 ,N}PN1​,N​ eigenvalues we can distinguish totally asymmetrical N particle states from the other states with lower degree of asymmetry.
oretical classification of manyparticle antisymmetri� cal states allows one to significantly simplify the anti� symmetrization procedure for Aparticle states. The efficiency of the proposed procedure for calculation of coefficients of fractional parentage uprise from the possibility to perform the calculation of translationally invariant CFP's in the ordinary oneparticle basis. The introduced CESO's may be used most effectively for ab initio No Core Nuclear Structure calculations with oscillator intrinsic density matrices within the framework of Reduced Hamiltonian method (2). Abstract—An efficient procedure for largescale calculations of the twoparticle translational invariant coef� ficients of fractional parentage (CESO's) for several jsh ells with isospin is presented. The approach is based on a simple enumeration scheme for antisymmetric manyparticle states and efficient algorithms for calcu� lation of the coefficients of fractional parentage for a single jshell and several jshells with isospin. The CESO's may be obtained by diagonalizing the centreofmass Hamiltonian in the basis set of antisymmetric Aparticle oscillator functions with singled out dependenc e on intrinsic coordinates of two last particles and choosing the subspace of its eigenvectors corresponding to the minimal eigenvalue equal to 3/2. An arbitrary number of oscillator quanta can be involved. The characteristics of the introduced CESO's basis are investi�
Abstract In the independent particle model, the total wave function is expressed as a linear combination of products of single particle wave functions. Fractional parentage coefficients give the part of the expression depending on the symmetry properties of the wave function. An operator is introduced which picks out the antisymmetric part of any n-particle wave function. The operator is given explicit form, and an explicit formula for the fractional parentage coefficients is deduced. The total fractional parentage coefficients can be split into a part depending on the orbital vectors, and a part depending on the spin (and isotopic spin) vectors. The separate parts can have symmetries other than total antisymmetry. Operators are introduced which pick out states of definite symmetry from any state. The operators are given explicit form, and explicit formulae for orbital, or spin, fractional coefficients are deduced. Detailed results are given for the three, four and five particles cases.
The construction of symmetric states of N particles with angular momentum j=1 is presented. Elliott's result (1958), dealing with the angular momentum content of the symmetric subset of states belonging to the set of states of N particles with angular momentum j=1 is obtained using Racah algebra for the angular momentum coupling. The explicit functional dependence, on the total angular momentum, of the coefficients of fractional parentage (CFP) associated with one, two, three and four removed particles is found for arbitrary values of N. This dependence is expressed through the simple algebraic functions of J and N.
A method for the calculation of translationally invariant wave functions for systems of identical fermions with arbitrary potential of pair interaction is developed.It is based on the well-known result that the essential dynamic part of Hamiltonian for the system of identical particles is the reduced Hamiltonian operator describing a relative movement of two particles inside the system.The eigenfunctions of this operator take into account all correlations caused by interaction.These eigenfunctions are basic elements for building the components (i.e., the functions with a lower degree of antisymmetry) used to construct the total antisymmetric wave function of the system.The main problem of this approach appears to be the antisymmetrization of the components.The developed universal algorithm for antisymmetrization gives a possibility to carry out this operation in a simple way and to keep numerical approximations under control.