"Bi-modal'' Isoscalar Giant Dipole Strength in 58Ni
B. K. Nayak, U. Garg, M. Hedden, M. Koss, T. Li, Y. Liu, P. V. Madhusudhana Rao, S. Zhu, M. Itoh, H. Sakaguchi, H. Takeda, M. Uchida, Y. Yasuda, M. Yosoi, H. Fujimura, M. Fujiwara, K. Hara, T. Kawabata, H. Akimune, M. N. Harakeh
Abstract
The strength distribution of the isoscalar giant dipole resonance (ISGDR) in 58Ni has been obtained over the energy range 10.5--49.5 MeV via extreme forward angle scattering (including 0) of 386 MeV α particles. We observe a ``bi-modal'' E1 strength distribution for the first time in an A < 90 nucleus. The observed ISGDR strength distribution is in good agreement with the predictions of a recent QRPA calculation.
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