"Bi-modal'' Isoscalar Giant Dipole Strength in $^{58}$Ni

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

doi:10.1016/j.physletb.2006.03.034

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"Bi-modal'' Isoscalar Giant Dipole Strength in $^{58}$Ni

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Abstract

The strength distribution of the isoscalar giant dipole resonance (ISGDR) in $^{58}$Ni has been obtained over the energy range 10.5--49.5 MeV via extreme forward angle scattering (including 0$^{\circ}$) 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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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. 2006-01-04. "Bi-modal'' Isoscalar Giant Dipole Strength in $^{58}$Ni. https://doi.org/10.1016/j.physletb.2006.03.034

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