Abstract
A group-theoretical formalism was developed and implemented in a fast routine in order to deal with photon induced reactions on triaxial nuclei in the energy region dominated by by the giant dipole resonance (GDR), which typically ranges between 10 and 30 MeV. This approach is based on the interacting boson model of nuclear structure, allowing for coupling between GDR and low-lying collective modes of the nucleus. Isospin degree of freedom can also be included in the calculations. The code computes total photoabsorption cross sections in the GDR region, (y,p) and (y,n) cross sections in the limit of exact isospin symmetry, and elastic and inelastic (to the first 2+ excited levels) photon scattering distributions. Use is made of group-theoretical techniques to deduce simple expressions for GDR excitation energies and dipole transition strengths; cross sections are then evaluated by means of the usual formalism in terms of nuclear polarizing capability. The routine assumes a simple form for the low energy spectrum of triaxial nuclei, corresponding to the exact SU(3) dynamic symmetry of the interacting boson model; moreover, isospin, when included, is assumed to be a good quantum number. The software package used allows the evaluation of photon absorption and scattering cross sections
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Citation Formats
Maino, G, and Bortolani, E.
Photon absorption and scattering cross sections by triaxal nuclei.
Italy: N. p.,
1991.
Web.
Maino, G, & Bortolani, E.
Photon absorption and scattering cross sections by triaxal nuclei.
Italy.
Maino, G, and Bortolani, E.
1991.
"Photon absorption and scattering cross sections by triaxal nuclei."
Italy.
@misc{etde_10128732,
title = {Photon absorption and scattering cross sections by triaxal nuclei}
author = {Maino, G, and Bortolani, E}
abstractNote = {A group-theoretical formalism was developed and implemented in a fast routine in order to deal with photon induced reactions on triaxial nuclei in the energy region dominated by by the giant dipole resonance (GDR), which typically ranges between 10 and 30 MeV. This approach is based on the interacting boson model of nuclear structure, allowing for coupling between GDR and low-lying collective modes of the nucleus. Isospin degree of freedom can also be included in the calculations. The code computes total photoabsorption cross sections in the GDR region, (y,p) and (y,n) cross sections in the limit of exact isospin symmetry, and elastic and inelastic (to the first 2+ excited levels) photon scattering distributions. Use is made of group-theoretical techniques to deduce simple expressions for GDR excitation energies and dipole transition strengths; cross sections are then evaluated by means of the usual formalism in terms of nuclear polarizing capability. The routine assumes a simple form for the low energy spectrum of triaxial nuclei, corresponding to the exact SU(3) dynamic symmetry of the interacting boson model; moreover, isospin, when included, is assumed to be a good quantum number. The software package used allows the evaluation of photon absorption and scattering cross sections by a given nucleus, including the execution of two plots, in less than 10 seconds.}
place = {Italy}
year = {1991}
month = {Dec}
}
title = {Photon absorption and scattering cross sections by triaxal nuclei}
author = {Maino, G, and Bortolani, E}
abstractNote = {A group-theoretical formalism was developed and implemented in a fast routine in order to deal with photon induced reactions on triaxial nuclei in the energy region dominated by by the giant dipole resonance (GDR), which typically ranges between 10 and 30 MeV. This approach is based on the interacting boson model of nuclear structure, allowing for coupling between GDR and low-lying collective modes of the nucleus. Isospin degree of freedom can also be included in the calculations. The code computes total photoabsorption cross sections in the GDR region, (y,p) and (y,n) cross sections in the limit of exact isospin symmetry, and elastic and inelastic (to the first 2+ excited levels) photon scattering distributions. Use is made of group-theoretical techniques to deduce simple expressions for GDR excitation energies and dipole transition strengths; cross sections are then evaluated by means of the usual formalism in terms of nuclear polarizing capability. The routine assumes a simple form for the low energy spectrum of triaxial nuclei, corresponding to the exact SU(3) dynamic symmetry of the interacting boson model; moreover, isospin, when included, is assumed to be a good quantum number. The software package used allows the evaluation of photon absorption and scattering cross sections by a given nucleus, including the execution of two plots, in less than 10 seconds.}
place = {Italy}
year = {1991}
month = {Dec}
}