Low-lying neutron unbound states in Be 12

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; S. J. Williams

doi:10.1103/PhysRevC.90.024309

Low-lying neutron unbound states in Be 12

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, S. J. Williams

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Abstract

The neutron decay of an unbound resonance in Be12 has been measured at 1243±21 keV decay energy with a width of 634±60 keV. This state was populated with a one-proton removal reaction from a 71 MeV/u B13 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 2n separation energy, the state decays predominantly by the emission of one neutron to Be11, setting an upper limit on the branching ratio for the two-neutron decay channel to Be10 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±5 keV.

Original language	English (US)
Article number	024309
Journal	Physical Review C - Nuclear Physics
Volume	90
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.90.024309
State	Published - Aug 15 2014
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.90.024309

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Smith, J. K., Baumann, T., Bazin, D., Brown, J., Casarotto, S., Deyoung, P. A., Frank, N., Hinnefeld, J., Hoffman, M., Jones, M. D., Kohley, Z., Luther, B., Marks, B., Smith, N., Snyder, J., Spyrou, A., Stephenson, S. L., Thoennessen, M., Viscariello, N., & Williams, S. J. (2014). Low-lying neutron unbound states in Be 12. Physical Review C - Nuclear Physics, 90(2), [024309]. https://doi.org/10.1103/PhysRevC.90.024309

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title = "Low-lying neutron unbound states in Be 12",

abstract = "The neutron decay of an unbound resonance in Be12 has been measured at 1243±21 keV decay energy with a width of 634±60 keV. This state was populated with a one-proton removal reaction from a 71 MeV/u B13 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 2n separation energy, the state decays predominantly by the emission of one neutron to Be11, setting an upper limit on the branching ratio for the two-neutron decay channel to Be10 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±5 keV.",

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

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doi = "10.1103/PhysRevC.90.024309",

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Smith, JK, Baumann, T, Bazin, D, Brown, J, Casarotto, S, Deyoung, PA, Frank, N, Hinnefeld, J, Hoffman, M, Jones, MD, Kohley, Z, Luther, B, Marks, B, Smith, N, Snyder, J, Spyrou, A, Stephenson, SL, Thoennessen, M, Viscariello, N & Williams, SJ 2014, 'Low-lying neutron unbound states in Be 12', Physical Review C - Nuclear Physics, vol. 90, no. 2, 024309. https://doi.org/10.1103/PhysRevC.90.024309

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AU - Smith, J. K.

AU - Baumann, T.

AU - Bazin, D.

AU - Brown, J.

AU - Casarotto, S.

AU - Deyoung, P. A.

AU - Frank, N.

AU - Hinnefeld, J.

AU - Hoffman, M.

AU - Jones, M. D.

AU - Kohley, Z.

AU - Luther, B.

AU - Marks, B.

AU - Smith, N.

AU - Snyder, J.

AU - Spyrou, A.

AU - Stephenson, S. L.

AU - Thoennessen, M.

AU - Viscariello, N.

AU - Williams, S. J.

PY - 2014/8/15

Y1 - 2014/8/15

N2 - The neutron decay of an unbound resonance in Be12 has been measured at 1243±21 keV decay energy with a width of 634±60 keV. This state was populated with a one-proton removal reaction from a 71 MeV/u B13 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 2n separation energy, the state decays predominantly by the emission of one neutron to Be11, setting an upper limit on the branching ratio for the two-neutron decay channel to Be10 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±5 keV.

AB - The neutron decay of an unbound resonance in Be12 has been measured at 1243±21 keV decay energy with a width of 634±60 keV. This state was populated with a one-proton removal reaction from a 71 MeV/u B13 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 2n separation energy, the state decays predominantly by the emission of one neutron to Be11, setting an upper limit on the branching ratio for the two-neutron decay channel to Be10 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±5 keV.

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Low-lying neutron unbound states in Be 12

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