Direct evidence of core excitation in the giant resonance through the (e,e{sup '}n) reaction
- Laboratory of Nuclear Science, Tohoku University, Mikamine, Taihaku-ku, Sendai 982-0826 (Japan)
Angular correlations and cross sections for the {sup 40}Ca(e,e{sup '}n){sup 39}Ca reaction have been measured in the continuum above the giant resonance. A comparison of the missing energy spectra between the peak and the tail regions of the giant resonance indicates that neutron emission in the peak region leads to populating the ground and first excited states, whereas emission in the tail region leads to populating excited states at an energy about 4.5 MeV higher. The latter seems to be because of the 2s{sub 1/2} and 1d{sub 5/2} hole excitation, that is core excitation. The same tendency was observed in the {sup 28}Si(e,e{sup '}n){sup 27}Si reaction of the sd shell nuclei but it did not appear as clearly in the {sup 12}C(e,e{sup '}n){sup 11}C reaction of the 1p shell nuclei.
- OSTI ID:
- 20698741
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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