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

(2) Kyoto University; (3) RCNP; (4) CNS; (5) Konan University; (6) KVI; B.K. Nayak (1); H. Akimune (5); H. Fujimura (3); H. Sakaguchi (2); H. Takeda (2)

arxiv: nucl-ex/0601009 · v1 · submitted 2006-01-04 · ⚛️ nucl-ex

"Bi-modal'' Isoscalar Giant Dipole Strength in ⁵⁸Ni

B.K. Nayak (1) , U. Garg (1) , M. Hedden (1) , M. Koss (1) , T. Li (1) , Y. Liu (1) , P.V. Madhusudhana Rao (1) , S. Zhu (1)

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M. Itoh (2) H. Sakaguchi (2) H. Takeda (2) M. Uchida (2) Y. Yasuda (2) M. Yosoi (2) H. Fujimura (3) M. Fujiwara (3) K. Hara (3) T. Kawabata (4) H. Akimune (5) M.N. Harakeh (6) ((1) Univesity of Notre Dame (2) Kyoto University Japan (3) RCNP Osaka University (4) CNS University of Tokyo (5) Konan University (6) KVI University of Groningen the Netherlands)

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keywords strengthdistributionbi-modaldipolegiantisgdrisoscalaragreement

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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 $\alpha$ 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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"Bi-modal'' Isoscalar Giant Dipole Strength in ⁵⁸Ni

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