Direct evidence of core excitation in the giant resonance through the $(e,{e}^{'}n)$ reaction

Direct evidence of core excitation in the giant resonance through the $(e, e^{'} n)$ reaction

T. Saito, K. Yoshida, M. Oikawa, Y. Suga, K. Kino, T. Nakagawa, T. Tohei, K. Abe, and H. Ueno

Phys. Rev. C 71, 064313 – Published 23 June 2005

Abstract

Angular correlations and cross sections for the ${}^{40}{Ca} (e, e^{'} n) {}^{39}{Ca}$ 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 $2 s_{1 / 2}$ and $1 d_{5 / 2}$ hole excitation, that is core excitation. The same tendency was observed in the ${}^{28}{Si} (e, e^{'} n) {}^{27}{Si}$ reaction of the sd shell nuclei but it did not appear as clearly in the ${}^{12}C (e, e^{'} n) {}^{11}C$ reaction of the 1p shell nuclei.

Received 22 December 2004

DOI:https://doi.org/10.1103/PhysRevC.71.064313

Authors & Affiliations

T. Saito^*, K. Yoshida^†, M. Oikawa^‡, Y. Suga^§, and K. Kino^∥

Laboratory of Nuclear Science, Tohoku University, Mikamine, Taihaku-ku, Sendai 982-0826, Japan

T. Nakagawa^¶ and T. Tohei

Department of Physics, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan

K. Abe

Department of Engineering, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan

H. Ueno

Department of Physics, Yamagata University, Kojirakawa, Yamagata 990-8560, Japan

^*Present address: Faculty of Engineering, Tohoku Gakuin University, Chuo, Tagajo 985-8537, Japan.
^†Present address: Toshiba Co. Shibaura, Minato-ku, Tokyo 105-0023, Japan.
^‡Present address: 5th Research Center, Technical Research & Development Institute, Japan Defense Agency, Nagase, Yokosuka 239-0826, Japan.
^§Present address: Hitachi Software Engineering Co., Nakase, Mihama-ku, Chiba 261-0023, Japan.
^∥Present address: Research Center for Nuclear Physics, Osaka University, Ibaraki 567-0047, Japan.
^¶Present address: Tohoku Institute of Technology, Kasumi-cho, Taihaku-ku, Sendai 982-8577, Japan.

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Issue

Vol. 71, Iss. 6 — June 2005

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Physical Review C

covering nuclear physics