Ground state energy and width of $^{7}\mathrm{He}$ from $^{8}\mathrm{Li}$ proton knockout

Ground state energy and width of ${}^{7}{He}$ from ${}^{8}{Li}$ proton knockout

D. H. Denby, P. A. DeYoung, T. Baumann, D. Bazin, E. Breitbach, J. Brown, N. Frank, A. Gade, C. C. Hall, J. Hinnefeld, C. R. Hoffman, R. Howes, R. A. Jenson, B. Luther, S. M. Mosby, C. W. Olson, W. A. Peters, A. Schiller, A. Spyrou, and M. Thoennessen

Phys. Rev. C 78, 044303 – Published 13 October 2008

Abstract

The ground state energy and width of ${}^{7}{He}$ has been measured with the Modular Neutron Array (MoNA) and superconducting dipole Sweeper magnet experimental setup at the National Superconducting Cyclotron Laboratory. ${}^{7}{He}$ was produced by proton knockout from a secondary ${}^{8}{Li}$ 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.

Received 16 July 2008

DOI:https://doi.org/10.1103/PhysRevC.78.044303

Authors & Affiliations

D. H. Denby¹, P. A. DeYoung¹, T. Baumann², D. Bazin², E. Breitbach³, J. Brown⁴, N. Frank^2,5,*, A. Gade^2,5, C. C. Hall¹, J. Hinnefeld⁶, C. R. Hoffman⁷, R. Howes³, R. A. Jenson⁸, B. Luther⁸, S. M. Mosby^2,5, C. W. Olson⁸, W. A. Peters^2,5, A. Schiller⁹, A. Spyrou², and M. Thoennessen^2,5

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

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

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Vol. 78, Iss. 4 — October 2008

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Physical Review C

covering nuclear physics

Ground state energy and width of ${}^{7}{He}$ from ${}^{8}{Li}$ proton knockout

D. H. Denby, P. A. DeYoung, T. Baumann, D. Bazin, E. Breitbach, J. Brown, N. Frank, A. Gade, C. C. Hall, J. Hinnefeld, C. R. Hoffman, R. Howes, R. A. Jenson, B. Luther, S. M. Mosby, C. W. Olson, W. A. Peters, A. Schiller, A. Spyrou, and M. Thoennessen

Phys. Rev. C 78, 044303 – Published 13 October 2008

Abstract

Authors & Affiliations

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Physical Review C

covering nuclear physics

Ground state energy and width of He7 from Li8 proton knockout

D. H. Denby, P. A. DeYoung, T. Baumann, D. Bazin, E. Breitbach, J. Brown, N. Frank, A. Gade, C. C. Hall, J. Hinnefeld, C. R. Hoffman, R. Howes, R. A. Jenson, B. Luther, S. M. Mosby, C. W. Olson, W. A. Peters, A. Schiller, A. Spyrou, and M. Thoennessen

Phys. Rev. C 78, 044303 – Published 13 October 2008

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Ground state energy and width of ${}^{7}{He}$ from ${}^{8}{Li}$ proton knockout