“Bi-modal” isoscalar giant dipole strength in 58Ni

Authors :: Nayak, B.K.
Garg, U.
Hedden, M.
Koss, M.
Li, T.
Liu, Y.
Madhusudhana Rao, P.V.
Zhu, S.
Itoh, M.
Sakaguchi, H.
Takeda, H.
Uchida, M.
Yasuda, Y.
Yosoi, M.
Fujimura, H.
Fujiwara, M.
Hara, K.
Kawabata, T.
Akimune, H.
Harakeh, M.N.
Source :: Physics Letters B. Jun2006, Vol. 637 Issue 1/2, p43-47. 5p.
Publication Year :: 2006
Abstract: 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 nucleus. The observed ISGDR strength distribution is in reasonable agreement with the predictions of a recent RPA calculation. [Copyright &y& Elsevier]