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Phys. Rev. Lett. 82, 3581–3584 (1999)

Observation of an Excited State in 7He with Unusual Structure

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A. A. Korsheninnikov1,*, M. S. Golovkov1,†, A. Ozawa1, E. A. Kuzmin2, E. Yu. Nikolskii2, K. Yoshida1, B. G. Novatskii2, A. A. Ogloblin2, I. Tanihata1, Z. Fulop1,‡, K. Kusaka1, K. Morimoto1, H. Otsu1, H. Petrascu1, and F. Tokanai1
1RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
2The Kurchatov Institute, Kurchatov sq. 1, 123 182 Moscow, Russia

Received 15 December 1998; published in the issue dated 3 May 1999

The transfer reaction p(8He,d)7He has been studied by correlational measurements, and an excited state of 7He was observed ( E* = 2.9±0.3MeV, Γ = 2.2±0.3MeV) which decays mainly into 3n+4He. Most likely, it has a structure with a neutron in an excited state coupled to the 6He core which itself is in the excited 2+ state.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.3581
DOI:
10.1103/PhysRevLett.82.3581
PACS:
25.60.-t, 23.20.En, 27.20.+n, 21.45.+v

*On leave from Kurchatov Institute, Moscow, Russia.

On leave from ATOMKI, Debrecen, Hungary.