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Title: Nucleon resonances in nuclei and quark exchange

Abstract

We investigate the photoexcitation of nucleon resonances in nuclei taking into account the quark structure of the nucleon. We calculate the total strength of the {ital M}1, {ital E}1, and {ital E}2 excitation in a two-nucleon system, considered as two three-quark clusters with a properly antisymmetrized wave function. The calculations show that the resonance excitation in the deuteron is not modified with respect to the free nucleon case. In contrast, when the nucleon relative distance assumes typical nuclear values, quark exchange leads to a {similar_to}11% damping of the {ital D}{sub 13} resonance and {similar_to}23% of the {ital F}{sub 15}, but it leaves the {Delta} excitation practically unaffected, in agreement with the recent photoabsorption measurements.

Authors:
;  [1]
  1. Dipartimento di Fisica dell` Universita Genova and Istituto Nazionale di Fisica Nucleare, Sezione di Genova, Via Dodecaneso 33, I-16146 Genova (Italy)
Publication Date:
OSTI Identifier:
142653
Resource Type:
Journal Article
Journal Name:
Physical Review, C
Additional Journal Information:
Journal Volume: 49; Journal Issue: 3; Other Information: PBD: Mar 1994
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; PHOTONUCLEAR REACTIONS; RESONANCE; DEUTERONS; M1-TRANSITIONS; E1-TRANSITIONS; E2-TRANSITIONS; DEUTERIUM TARGET; NUCLEONS; N BARYONS; QUARK MODEL; WAVE FUNCTIONS; EXCITATION

Citation Formats

Giannini, M.M., and Santopinto, E. Nucleon resonances in nuclei and quark exchange. United States: N. p., 1994. Web. doi:10.1103/PhysRevC.49.R1258.
Giannini, M.M., & Santopinto, E. Nucleon resonances in nuclei and quark exchange. United States. doi:10.1103/PhysRevC.49.R1258.
Giannini, M.M., and Santopinto, E. Tue . "Nucleon resonances in nuclei and quark exchange". United States. doi:10.1103/PhysRevC.49.R1258.
@article{osti_142653,
title = {Nucleon resonances in nuclei and quark exchange},
author = {Giannini, M.M. and Santopinto, E.},
abstractNote = {We investigate the photoexcitation of nucleon resonances in nuclei taking into account the quark structure of the nucleon. We calculate the total strength of the {ital M}1, {ital E}1, and {ital E}2 excitation in a two-nucleon system, considered as two three-quark clusters with a properly antisymmetrized wave function. The calculations show that the resonance excitation in the deuteron is not modified with respect to the free nucleon case. In contrast, when the nucleon relative distance assumes typical nuclear values, quark exchange leads to a {similar_to}11% damping of the {ital D}{sub 13} resonance and {similar_to}23% of the {ital F}{sub 15}, but it leaves the {Delta} excitation practically unaffected, in agreement with the recent photoabsorption measurements.},
doi = {10.1103/PhysRevC.49.R1258},
journal = {Physical Review, C},
number = 3,
volume = 49,
place = {United States},
year = {1994},
month = {3}
}