1. What are the contributions in this paper?
Y. Ichikawa, ∗ H. Nishibata, 2 Y. Tsunoda, A. Takamine, K. Imamura, 4 T. Fujita, 2 T. Sato, 5 S. Momiyama, Y. Shimizu, D. S. Ahn, K. Asahi, 5 H. Baba, D. L. Balabanski, 7 F. Boulay, 8, 9 J. M. Daugas, 8 T. Egami, N. Fukuda, C. Funayama, T. Furukawa, G. Georgiev, A. Gladkov, 13 N. Inabe, Y. Ishibashi, 14 T. Kawaguchi, T. Kawamura, Y. Kobayashi, S. Kojima, A. Kusoglu, 12, 16 I. Mukul, M. Niikura, T. Nishizaka, A. Odahara, Y. Ohtomo, 5 T. Otsuka, 3, 6, 18 D. Ralet, G. S. Simpson, T. Sumikama, H. Suzuki, H. Takeda, L. C. Tao, 20 Y. Togano, D. Tominaga, H. Ueno, H. Yamazaki, and X. F. Yang RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0034, Japan Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan Department of Physics, Meiji University, 1-1-1 Higashi-Mita, Tama, Kawasaki, Kanagawa 214-8571, Japan Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan ELI-NP, Horia Hulubei National Institute of Physics and Nuclear Engineering, 077125 Măgurele, Romania CEA, DAM, DIF, F-91297 Arpajon, France GANIL, CEA/DSM-CNRS/IN2P3, Bvd Henri Becquerel, F-14076 Caen, France Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan CSNSM, CNRS-IN2P3, Université Paris-sud, UMR8609, F-91405 Orsay-Campus, France Department of Physics, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 702-701, South Korea Department of Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan Department of Informatics and Engineering, University of Electro-Communication, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, 34134 Istanbul, Turkey Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100, Israel Instituut voor Kernen Stralingsfysica, K. U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium LPSC, CNRS/IN2P3, Univerisité Grenoble Alpes, CNRS/IN2P3, INPG, F-38026 Grenoble, France State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China ( Dated: January 23, 2019 )
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2. What was the PF scheme used to produce the spin alignment?
The momentum selection to produce the spin alignment was performed using information obtained from two parallel-plate avalanche counters placed at F7.
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3. What is the spin parity of the 61.7-keV level?
In the present experiment the spin parity of the 61.7-keV level was assigned to be Iπ = 1/2− based on the non-observation of the oscillation signal.
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4. What is the occupation number of the proton p3/2 orbital?
The MCSM calculation indicates that in the 3/2− state of 75Cu the occupation number of the proton p3/2 orbital is 0.86, somewhat smaller than unity, whereas that of the proton f5/2 orbital is 0.35.
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![FIG. 3: Systematics of the magnetic moments for odd-A Cu isotopes. Filled (open) circles represent experimental data for the 3/2− (5/2−) states [11, 12, 20], with error bars of 1σ. The filled red circle represents the result obtained in this work. The solid green (blue) lines indicates the present MCSM calculations for the 3/2− (5/2−) states. µ(πp3/2) and µ(πf5/2) denote the proton Schmidt values for p3/2 and f5/2, respectively.](/figures/fig-3-systematics-of-the-magnetic-moments-for-odd-a-cu-1fwphb04.webp)
![FIG. 1: Shell evolution in neutron-rich Cu isotopes. a. Experimental systematics of energy level and spin parity for odd-A Cu isotopes [10–13]. Red and blue bars represent the 5/2− and 3/2− states, respectively. The inset shows the low-lying isomeric states of 75Cu, which emit a 61.7-keV γ ray with a half-life of T1/2 = 310(8) ns and a 66.2-keV γ ray with T1/2 = 149(6) ns [14]. The spin parity values in red were identified as a result of the present experiment. b. Theoretical energy of the 5/2− 1 state as measured from the 3/2− 1 state calculated in three different ways with the A3DA-m Hamiltonian [15]. The red squares are obtained from the full calculation with the Monte Carlo Shell Model (MCSM). The blue solid line represents the single-particle energies in the näıve shell evolution scenario, driven by the monopole interaction. The green dashed line represents the effects of the core excitation, when the most relevant monopole interaction between the πf5/2 or πp3/2 orbital and the νg9/2 orbital is deactivated. The vertical pink arrow indicates schematically the effect of core excitation, whereas the horizontal red arrow indicates the shift of the crossing point.](/figures/fig-1-shell-evolution-in-neutron-rich-cu-isotopes-a-1adi33en.webp)
