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Title: 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

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2];  [2];  [2]
  1. Laboratory of Nuclear Science, Tohoku University, Mikamine, Taihaku-ku, Sendai 982-0826 (Japan)
  2. (Japan)
Publication Date:
OSTI Identifier:
20771361
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.73.034614; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALUMINIUM 28; BERYLLIUM 7; COMPARATIVE EVALUATIONS; E0-TRANSITIONS; E2-TRANSITIONS; ELECTRON REACTIONS; EXCITATION; GIANT RESONANCE; ISOVECTORS; LITHIUM 7; LITHIUM 7 REACTIONS; MEV RANGE; MOMENTUM TRANSFER; SILICON 28; SILICON 28 TARGET; SUM RULES

Citation Formats

Kino, K., Saito, T., Nakagawa, T., Tamae, T., Nishikawa, I., Asano, Y., Toda, H., Watabe, M., Nakagawa, T., Tsubota, H., Takahashi, K., Utoyama, M., Higuchi, M., Matsuura, Y., Ueno, H., Suzuki, T., Department of Physics, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Faculty of Engineering, Tohoku Gakuin University, Chuo, Tagajo 985-8537, and Department of Physics, Yamagata University, Kojirakawa, Yamagata 990-8560. 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. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.034614.
Kino, K., Saito, T., Nakagawa, T., Tamae, T., Nishikawa, I., Asano, Y., Toda, H., Watabe, M., Nakagawa, T., Tsubota, H., Takahashi, K., Utoyama, M., Higuchi, M., Matsuura, Y., Ueno, H., Suzuki, T., Department of Physics, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Faculty of Engineering, Tohoku Gakuin University, Chuo, Tagajo 985-8537, & Department of Physics, Yamagata University, Kojirakawa, Yamagata 990-8560. 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. United States. doi:10.1103/PhysRevC.73.034614.
Kino, K., Saito, T., Nakagawa, T., Tamae, T., Nishikawa, I., Asano, Y., Toda, H., Watabe, M., Nakagawa, T., Tsubota, H., Takahashi, K., Utoyama, M., Higuchi, M., Matsuura, Y., Ueno, H., Suzuki, T., Department of Physics, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Faculty of Engineering, Tohoku Gakuin University, Chuo, Tagajo 985-8537, and Department of Physics, Yamagata University, Kojirakawa, Yamagata 990-8560. Wed . "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". United States. doi:10.1103/PhysRevC.73.034614.
@article{osti_20771361,
title = {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},
author = {Kino, K. and Saito, T. and Nakagawa, T. and Tamae, T. and Nishikawa, I. and Asano, Y. and Toda, H. and Watabe, M. and Nakagawa, T. and Tsubota, H. and Takahashi, K. and Utoyama, M. and Higuchi, M. and Matsuura, Y. and Ueno, H. and Suzuki, T. and Department of Physics, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578 and Faculty of Engineering, Tohoku Gakuin University, Chuo, Tagajo 985-8537 and Department of Physics, Yamagata University, Kojirakawa, Yamagata 990-8560},
abstractNote = {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.},
doi = {10.1103/PhysRevC.73.034614},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 73,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}