Low-lying dipole response in the unstable Ni-70 nucleus
- Wieland, O.
- Bracco, A.
- Camera, F.
- Avigo, R.
- Baba, H.
- Nakatsuka, N.
- Aumann, T.
- Banerjee, S. R.
- Benzoni, G.
- Boretzky, K.
- Caesar, C.
- Ceruti, S.
- Chen, S.
- Crespi, F. C. L.
- Derya, V.
- Doornenbal, P.
- Fukuda, N.
- Giaz, A.
- Ieki, K.
- Kobayashi, N.
- Kondo, Y.
- Koyama, S.
- Kubo, T.
- Matsushita, M.
- Million, B.
- Motobayashi, T.
- Nakamura, T.
- Nishimura, M.
- Otsu, H.
- Ozaki, T.
- Saito, A. T.
- Sakurai, H.
- Scheit, H.
- Schindler, F.
- Schrock, P.
- Shiga, Y.
- Shikata, M.
- Shimoura, S.
- Steppenbeck, D.
- Sumikama, T.
- Takeuchi, S.
- Taniuchi, R.
- Togano, Y.
- Tscheuschner, J.
- Tsubota, J.
- Wang, H.
- Wimmer, K.
- Yoneda, K.
DOIAbstract
The Coulomb excitation of the neutron-rich nucleus Ni-70 was measured in inverse kinematics at 260A MeV bombarding energy and with a Au-197 target. The beam energy allowed us to study the dipole response around the neutron separation energy (up to about 12 MeV). The experiment was performed at the RIKEN Radioactive Isotope Beam Factory (RIBF). The gamma decay from the scattered Ni-70 ions at around zero degree was measured with a scintillator detection system composed of large volume LaBr3:Ce detectors (HECTOR+ array) and NaI(Tl) detectors (DALI2 array). Results were obtained for the E1 strength in the region where the dipole response is characterized by the presence of the pygmy dipole resonance. The measured E1 strength is found to be lar...
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