Search for unbound Be15 states in the 3n+Be12 channel

Kuchera, A. N.; Spyrou, A.; Smith, J. K.; Baumann, T.; Christian, G.; DeYoung, P. A.; Finck, J. E.; Frank, N.; Jones, M. D.; Kohley, Z.; Mosby, S.; Peters, W. A.; Thoennessen, M.

doi:10.1103/PhysRevC.91.017304

Title: Search for unbound ${}^{15}{Be}$ states in the $3 n + {}^{12}{Be}$ channel

Abstract

Background: Be-15 is expected to have low-lying 3/2(+) and 5/2(+) states. A first search did not find the 3/2(+) [A. Spyrou et al., Phys. Rev. C 84, 044309 (2011)]; however, a resonance in Be-15 was populated in a second attempt and determined to be unbound with respect to Be-14 by 1.8(1) MeV with a tentative spin-parity assignment of 5/2(+) [J. Snyder et al., Phys. Rev. C 88, 031303(R) (2013)]. Purpose: Search for the predicted Be-15 3/2(+) state in the three-neutron decay channel. Method: A two-proton removal reaction from a 55 MeV/u C-17 beam was used to populate neutron-unbound states in Be-15. The two-, three-, and four-body decay energies of the Be-12+ neutron(s) detected in coincidence were reconstructed using invariant mass spectroscopy. Monte Carlo simulations were performed to extract the resonance and decay properties from the observed spectra. Results: The low-energy regions of the decay energy spectra can be described with the first excited unbound state of Be-14 (E-x = 1.54 MeV, E-r = 0.28 MeV). Including a state in Be-15 that decays through the first excited Be-14 state slightly improves the fit at higher energies though the cross section is small. Conclusions: A Be-15 component is not needed to describemore »« less

Authors:

Kuchera, A. N. ^[1]; Spyrou, A. ^[1]; Smith, J. K. ^[1]; Baumann, T. ^[1]; Christian, G. ^[1]; DeYoung, P. A. ^[2]; Finck, J. E. ^[3]; Frank, N. ^[4]; Jones, M. D. ^[1]; Kohley, Z. ^[1]; Mosby, S. ^[1]; Peters, W. A. ^[5]; Thoennessen, M. ^[1]

Michigan State Univ., East Lansing, MI (United States)
Hope College, Holland, MI (United States)
Central Michigan Univ., Mount Pleasant, MI (United States)
Augustana College, Rock Island, IL (United States)
Rutgers Univ., Piscataway, NJ (United States)

Publication Date:: 2015-01-28

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear Science and Security Consortium

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1454846

Grant/Contract Number:: NA0000979

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C, Nuclear Physics

Additional Journal Information:: Journal Volume: 91; Journal Issue: 1; Journal ID: ISSN 0556-2813

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Kuchera, A. N., Spyrou, A., Smith, J. K., Baumann, T., Christian, G., DeYoung, P. A., Finck, J. E., Frank, N., Jones, M. D., Kohley, Z., Mosby, S., Peters, W. A., and Thoennessen, M. Search for unbound Be15 states in the 3n+Be12 channel.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevC.91.017304.

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                    Kuchera, A. N., Spyrou, A., Smith, J. K., Baumann, T., Christian, G., DeYoung, P. A., Finck, J. E., Frank, N., Jones, M. D., Kohley, Z., Mosby, S., Peters, W. A., & Thoennessen, M. Search for unbound Be15 states in the 3n+Be12 channel.  United States.  https://doi.org/10.1103/PhysRevC.91.017304

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                    Kuchera, A. N., Spyrou, A., Smith, J. K., Baumann, T., Christian, G., DeYoung, P. A., Finck, J. E., Frank, N., Jones, M. D., Kohley, Z., Mosby, S., Peters, W. A., and Thoennessen, M. Wed .  
"Search for unbound Be15 states in the 3n+Be12 channel".  United States.  https://doi.org/10.1103/PhysRevC.91.017304.  https://www.osti.gov/servlets/purl/1454846.

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@article{osti_1454846,

  title        = {Search for unbound Be15 states in the 3n+Be12 channel},

  author       = {Kuchera, A. N. and Spyrou, A. and Smith, J. K. and Baumann, T. and Christian, G. and DeYoung, P. A. and Finck, J. E. and Frank, N. and Jones, M. D. and Kohley, Z. and Mosby, S. and Peters, W. A. and Thoennessen, M.},

  abstractNote = {Background: Be-15 is expected to have low-lying 3/2(+) and 5/2(+) states. A first search did not find the 3/2(+) [A. Spyrou et al., Phys. Rev. C 84, 044309 (2011)]; however, a resonance in Be-15 was populated in a second attempt and determined to be unbound with respect to Be-14 by 1.8(1) MeV with a tentative spin-parity assignment of 5/2(+) [J. Snyder et al., Phys. Rev. C 88, 031303(R) (2013)]. Purpose: Search for the predicted Be-15 3/2(+) state in the three-neutron decay channel. Method: A two-proton removal reaction from a 55 MeV/u C-17 beam was used to populate neutron-unbound states in Be-15. The two-, three-, and four-body decay energies of the Be-12+ neutron(s) detected in coincidence were reconstructed using invariant mass spectroscopy. Monte Carlo simulations were performed to extract the resonance and decay properties from the observed spectra. Results: The low-energy regions of the decay energy spectra can be described with the first excited unbound state of Be-14 (E-x = 1.54 MeV, E-r = 0.28 MeV). Including a state in Be-15 that decays through the first excited Be-14 state slightly improves the fit at higher energies though the cross section is small. Conclusions: A Be-15 component is not needed to describe the data. If the 3/2(+) state in Be-15 is populated, the decay by three-neutron emission through Be-14 is weak,},

  doi          = {10.1103/PhysRevC.91.017304},

  journal      = {Physical Review C, Nuclear Physics},

  number       = 1,

  volume       = 91,

  place        = {United States},

  year         = {2015},

  month        = {1}

}

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FIG. 1: Select low-lying levels in beryllium isotopes from [10–12]. The dashed blue arrow represents the one-neutron decay from ¹⁵Be to ¹⁴Be [10] and the solid red arrows represent the suggested decay path in [8] searched for in this work. The red-shaded box represents the range of energies that weremore »

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Works referencing / citing this record:

Three-body model for the two-neutron emission of ${}^{16}{Be}$
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Title: Search for unbound Be 15 states in the 3 n + Be 12 channel

Abstract

Citation Formats

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Title: Search for unbound ${}^{15}{Be}$ states in the $3 n + {}^{12}{Be}$ channel

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Lithium isotopes beyond the drip line
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