Phys.Rev. C 98, 064313 (2018)

O.Wieland, A.Bracco, F.Camera, R.Avigo, H.Baba, N.Nakatsuka, T.Aumann, S.R.Banerjee, G.Benzoni, K.Boretzky, C.Caesar, S.Ceruti, S.Chen, F.C.L.Crespi, V.Derya, P.Doornenbal, N.Fukuda, A.Giaz, K.Ieki, N.Kobayashi, Y.Kondo, S.Koyama, T.Kubo, M.Matsushita, B.Million, T.Motobayashi, T.Nakamura, M.Nishimura, H.Otsu, T.Ozaki, A.T.Saito, H.Sakurai, H.Scheit, F.Schindler, P.Schrock, Y.Shiga, M.Shikata, S.Shimoura, D.Steppenbeck, T.Sumikama, S.Takeuchi, R.Taniuchi, Y.Togano, J.Tscheuschner, J.Tsubota, H.Wang, K.Wimmer, K.Yoneda

Low-lying dipole response in the unstable ⁷⁰Ni nucleus

NUCLEAR REACTIONS ¹⁹⁷Au(⁷⁰Ni, ⁷⁰Ni'), E=260 MeV/nucleon, [secondary ⁷⁰Ni beam from ⁹Be(²³⁸U, F), E=345 MeV/nucleon primary reaction and using the BigRIPS magnetic separator for ⁷⁰Ni ions]; measured reaction products, Eγ, Iγ, Coulomb excitation yields using HECTOR⁺ and DALI2 arrays at RIBF-RIKEN. ⁷⁰Ni; deduced 1- pygmy dipole resonances (PDR), B(E1) strengths for 1- states, energy weighted sum rule (EWSR), and B(E2) for the first 2+ state. Comparison with data for ⁶⁸Ni, and with theoretical predictions.

doi: 10.1103/PhysRevC.98.064313