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Microscopic Studies of Electric Dipole Resonances in 1 p Shell Nuclei
Author(s) -
Kissener H. R.,
Rotter I.,
Goncharova N. G.
Publication year - 1987
Publication title -
fortschritte der physik/progress of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/prop.2190350402
Subject(s) - isovector , physics , isospin , multipole expansion , shell (structure) , giant resonance , excited state , atomic physics , dipole , nuclear structure , shell model , isoscalar , nuclear physics , nuclear reaction , nucleon , quantum mechanics , materials science , composite material
Recent data on total and partial photonuclear cross sections in the GDR region of the nuclei 6 Li to 16 O are compared with theoretical predictions, mostly from shell model and continum shell model studies. The influence of the size of the configuration space, of the adopted residual interaction and of the continuous spectrum on the isovector E 1 response is discussed to some detail. The observed trends of the localization, the shape and width, the isospin and the configurational structure of the GDR with increasing 1 p shell occupation are related to the microscopic structure of the nuclear ground state. Particular attention is given to the partial (γ, N i ) disintegration channels. Complex‐particle emission and isospin mixing in the nuclear states are discussed for a few cases. An attempt is made to bring some systematics also in the evidence on excited‐state giant resonances through the 1 p shell region. The photonuclear GDR is compared with other giant multipole excitations, mostly for the example of the 14 C nucleus.