Measurement of E2-E0 strength in the isovector giant resonance (GQR-GMR) region of {sup 28}Si nuclei through the (e,e{sup '}n) reaction
Journal Article
·
· Physical Review. C, Nuclear Physics
- Laboratory of Nuclear Science, Tohoku University, Mikamine, Taihaku-ku, Sendai 982-0826 (Japan)
We have measured the {sup 28}Si(e,e{sup '}n) reaction in the excitation energy range 21.5-40.5 MeV at three effective momentum transfers, 0.38, 0.49, and 0.60 fm{sup -1}. The E1 and E2-E0 components were separated based on their different momentum-transfer dependences. The E1 strength obtained was found to agree with that of photoreactions in shape and strength. The strength of the E2-E0 component at low excitation energies was very small when compared with that of the (e,e{sup '}p) reaction. At higher excitation energies, the E2-E0 component has a bump structure at about 26-30 MeV and it is suggested that it has an isovector character by comparison with ({alpha},{alpha}{sup '}) reaction data. This is supported by results of a {sup 28}Si({sup 7}Li,{sup 7}Be){sup 28}Al experiment. The E2-E0 strength of 37.9({+-}4.7)% in the isovector E2 energy-weighted sum rule is exhausted in the excitation energy range 22.5-40.5 MeV.
- OSTI ID:
- 20771361
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 73; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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