Nucleon Resonances in Nuclei and Quark Levels
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Published:1997-03
Issue:01
Volume:06
Page:65-81
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ISSN:0218-3013
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Container-title:International Journal of Modern Physics E
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language:en
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Short-container-title:Int. J. Mod. Phys. E
Author:
Giannini M. M.1,
Trovatore E.1
Affiliation:
1. Dipartimento di Fisica dell'Università - Genova, Istituto Nazionale di Fisica Nucleare - Sezione di Genova, via Dodecaneso 33, 16146 Genova, Italy
Abstract
The effect of the nuclear medium on the excitation mechanism of nucleon resonances is investigated in the framework of the constituent quark model (CQM). Calculations of the total strength of the M1 and E1 excitations in a two-nucleon system are performed by means of a two-centre quark potential model in which the intercluster barrier is allowed to vary with the relative distance. The results show that the resonance excitation in the deuteron is not modified with respect to the free nucleon case. In contrast, when the internucleon distance assumes typical nuclear values, the pattern of the quark levels leads to a ~ 10% damping of the D 13 resonance, leaving the Δ excitation unaffected, in agreement with the recent photoabsorption measurements.
Publisher
World Scientific Pub Co Pte Lt
Subject
General Physics and Astronomy,Nuclear and High Energy Physics