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Phys. Rev. C 58, 116–126 (1998)

Nuclear structure of 17Ne by the three-neutron pickup (3He,6He) reaction

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V. Guimarães1,2, S. Kubono2, N. Ikeda3, I. Katayama2, T. Nomura4, M. H. Tanaka4, Y. Fuchi4, H. Kawashima4, S. Kato4, H. Toyokawa5, C. C. Yun6, T. Niizeki7, T. Kubo8, M. Ohura8, and M. Hosaka9
1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
2Center for Nuclear Study, University of Tokyo, 3-2-1 Midori-cho, Tanashi, Tokyo 188, Japan
3Department of Physics, Kyushuu University, Fukuoka, Japan
4Institute of Particle and Nuclear Physics, KEK, Tsukuba 305, Japan
5Research Center for Nuclear Physics, Osaka 567, Japan
6Department of Physics, Tohoku University, Sendai 980, Japan
7Tokyo Institute of Technology, Meguro, Tokyo 152, Japan
8Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-01, Japan
9Institute for Molecular Science, Okazaki 444, Japan

Received 11 February 1998; published in the issue dated July 1998

The nuclear structure of 17Ne has been studied by the 20Ne(3He,6He)17Ne reaction at 70 MeV. Thirteen levels were identified in 17Ne, and angular distributions have been measured for the first time for this reaction. Based on the observed transferred angular momentum dependence of the angular distributions, a spin-parity assignment has been made for several states in 17Ne. With the inclusion of the data on 17Ne, T=3/2 quartet analog states have been completed for six levels in the A=17 isobar system. The level shifts in these A=17 nuclei are analyzed in terms of the isobaric multiplet mass equation (IMME). The results of such an analysis show a slight linear dependence of the b and c coefficients of the equation on the excitation energy. The coefficients for the positive parity states seem to follow a different systematics than the negative parity states, suggesting that these parity-dependent level shifts are reflecting the structure change. These coefficients of the IMME are discussed.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.58.116
DOI:
10.1103/PhysRevC.58.116
PACS:
21.10.Hw, 25.55.Hp, 27.20.+n