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Enhanced collectivity in Ni |
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| Authors: | N. Aoi S. Kanno S. Takeuchi H. Suzuki D. Bazin M.D. Bowen C.M. Campbell J.M. Cook D.-C. Dinca A. Gade T. Glasmacher H. Iwasaki T. Kubo K. Kurita T. Motobayashi W.F. Mueller T. Nakamura H. Sakurai M. Takashina J.R. Terry K. Yoneda H. Zwahlen |
| Affiliation: | 1. RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;2. Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan;3. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA;4. Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan;5. Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan;6. Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan;g Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan |
| Abstract: | The neutron-rich nucleus 74Ni was studied with inverse-kinematics inelastic proton scattering using a 74Ni radioactive beam incident on a liquid hydrogen target at a center-of-mass energy of 80 MeV. From the measured de-excitation γ rays, the population of the first 2+ state was quantified. The angle-integrated excitation cross section was determined to be 14(4) mb. A deformation length of δ=1.04(16) fm was extracted in comparison with distorted wave theory, which suggests that the enhancement of collectivity established for 70Ni continues up to 74Ni. A comparison with results of shell model and quasi-particle random phase approximation calculations indicates that the magic character of Z=28 or N=50 is weakened in 74Ni. |
| Keywords: | Proton inelastic scattering Quadrupole collectivity 74Ni |
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