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Phys. Rev. Lett. 84, 39–42 (2000)

Core-Excited States in the Doubly Magic 68Ni and its Neighbor 69Cu

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T. Ishii1, M. Asai1, A. Makishima2, I. Hossain3, M. Ogawa3, J. Hasegawa3, M. Matsuda1, and S. Ichikawa1
1Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
2Department of Liberal Arts and Sciences, National Defense Medical College, Tokorozawa, Saitama 359-8513, Japan
3Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan

Received 7 June 1999; published in the issue dated 3 January 2000

In deep-inelastic collisions of 8 MeV/nucleon 70Zn projectiles with 198Pt, we have found an 8+ isomer with T1/2 = 23(1) ns at 4208 keV in 68Ni; the νg9/2 E2 effective charge was determined to be 1.5(1)e. In 69Cu, a 19/2- isomer with T1/2 = 22(1) ns at 3691 keV was identified and its decay data were calculated quite accurately by a parameter-free shell model calculation using empirical input parameters. Proton 2p- 1h excitation, fed by another T1/2 = 39(6) ns isomer at 3827 keV, induces large collectivity in 69Cu.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.39
DOI:
10.1103/PhysRevLett.84.39
PACS:
23.20.-g, 21.60.Cs, 25.70.Lm, 27.50.+e
 
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