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Phys. Rev. C 78, 044303 (2008) [6 pages]

Ground state energy and width of 7He from 8Li proton knockout

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D. H. Denby1, P. A. DeYoung1, T. Baumann2, D. Bazin2, E. Breitbach3, J. Brown4, N. Frank2,5,*, A. Gade2,5, C. C. Hall1, J. Hinnefeld6, C. R. Hoffman7, R. Howes3, R. A. Jenson8, B. Luther8, S. M. Mosby2,5, C. W. Olson8, W. A. Peters2,5, A. Schiller9, A. Spyrou2, and M. Thoennessen2,5
1Department of Physics, Hope College, Holland, Michigan 49423, USA
2National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
3Department of Physics, Marquette University, Milwaukee, Wisconsin 53201, USA
4Department of Physics, Wabash College, Crawfordsville, Indiana 47933, USA
5Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
6Department of Physics and Astronomy, Indiana University at South Bend, South Bend, Indiana 46634, USA
7Department of Physics, Florida State University, Tallahassee, Florida 32303, USA
8Department of Physics, Concordia College, Moorhead, Minnesota 56562, USA
9Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA

Received 16 July 2008; published 13 October 2008

The ground state energy and width of 7He has been measured with the Modular Neutron Array (MoNA) and superconducting dipole Sweeper magnet experimental setup at the National Superconducting Cyclotron Laboratory. 7He was produced by proton knockout from a secondary 8Li beam. The measured decay energy spectrum is compared to simulations based on Breit-Wigner line shape with an energy-dependent width for the resonant state. The energy of the ground state is found to be 400(10) keV with a full-width at half-maximum of 125(-15+40) keV.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.044303
DOI:
10.1103/PhysRevC.78.044303
PACS:
21.10.Dr, 21.10.Pc, 27.20.+n, 29.30.Hs

*Present address: Physics Department, Illinois Wesleyan University, Bloomington, IL 61701, USA.

 
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