Low-lying neutron unbound states in $^{12}\mathrm{Be}$

Low-lying neutron unbound states in ${}^{12}{Be}$

J. K. Smith, T. Baumann, D. Bazin, J. Brown, S. Casarotto, P. A. DeYoung, N. Frank, J. Hinnefeld, M. Hoffman, M. D. Jones, Z. Kohley, B. Luther, B. Marks, N. Smith, J. Snyder, A. Spyrou, S. L. Stephenson, M. Thoennessen, N. Viscariello, and S. J. Williams

Phys. Rev. C 90, 024309 – Published 15 August 2014

Abstract

The neutron decay of an unbound resonance in ${}^{12}{Be}$ has been measured at $1243 \pm 21$ keV decay energy with a width of $634 \pm 60$ keV. This state was populated with a one-proton removal reaction from a 71 MeV/u ${}^{13}B$ beam incident upon a beryllium target. The invariant mass reconstruction of the resonance was achieved by measuring the daughter fragment in coincidence with neutrons. Despite being above the $2 n$ separation energy, the state decays predominantly by the emission of one neutron to ${}^{11}{Be}$ , setting an upper limit on the branching ratio for the two-neutron decay channel to ${}^{10}{Be}$ of less than 5%. From the characteristics of the population and decay of the resonance, it is concluded that this state cannot correspond to the previously observed state at $4580 \pm 5$ keV.

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Received 10 April 2014
Revised 27 June 2014

DOI:https://doi.org/10.1103/PhysRevC.90.024309

Authors & Affiliations

J. K. Smith^1,2,*, T. Baumann¹, D. Bazin¹, J. Brown³, S. Casarotto⁴, P. A. DeYoung⁵, N. Frank⁴, J. Hinnefeld⁶, M. Hoffman⁴, M. D. Jones^1,2, Z. Kohley^1,7, B. Luther⁸, B. Marks⁵, N. Smith⁴, J. Snyder¹, A. Spyrou^1,2, S. L. Stephenson⁹, M. Thoennessen^1,2, N. Viscariello⁴, and S. J. Williams¹

¹National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
²Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
³Department of Physics, Wabash College, Crawfordsville, Indiana 47933, USA
⁴Department of Physics and Astronomy, Augustana College, Rock Island, Illinois 61201, USA
⁵Department of Physics, Hope College, Holland, Michigan 49422, USA
⁶Department of Physics and Astronomy, Indiana University at South Bend, South Bend, Indiana 46634, USA
⁷Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
⁸Department of Physics, Concordia College, Moorhead, Minnesota 56562, USA
⁹Department of Physics, Gettysburg College, Gettysburg, Pennsylvania 17325, USA

^*smith.jenna.kathleen@gmail.com

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Vol. 90, Iss. 2 — August 2014

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Physical Review C

covering nuclear physics

Low-lying neutron unbound states in ${}^{12}{Be}$

J. K. Smith, T. Baumann, D. Bazin, J. Brown, S. Casarotto, P. A. DeYoung, N. Frank, J. Hinnefeld, M. Hoffman, M. D. Jones, Z. Kohley, B. Luther, B. Marks, N. Smith, J. Snyder, A. Spyrou, S. L. Stephenson, M. Thoennessen, N. Viscariello, and S. J. Williams

Phys. Rev. C 90, 024309 – Published 15 August 2014

Abstract

Authors & Affiliations

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Physical Review C

covering nuclear physics

Low-lying neutron unbound states in Be12

J. K. Smith, T. Baumann, D. Bazin, J. Brown, S. Casarotto, P. A. DeYoung, N. Frank, J. Hinnefeld, M. Hoffman, M. D. Jones, Z. Kohley, B. Luther, B. Marks, N. Smith, J. Snyder, A. Spyrou, S. L. Stephenson, M. Thoennessen, N. Viscariello, and S. J. Williams

Phys. Rev. C 90, 024309 – Published 15 August 2014

Abstract

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Low-lying neutron unbound states in ${}^{12}{Be}$