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

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.:: Nuclear Science and Security Consortium, Berkeley, CA (United States)

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.  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., and Thoennessen, M. Wed .  
        "Search for unbound Be15 states in the 3n+Be12 channel".  United States.  doi: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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DOI: 10.1103/PhysRevC.91.017304

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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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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

Single-neutron knockout reactions: Application to the spectroscopy of $^{16, 17, 19} C$
journal, January 2001

The first 2+ state of 14Be
journal, October 2007

Search for the $^{15}$ Be ground state
journal, October 2011

First observation of the $^{13}$ Li ground state
journal, January 2013

Structure of the unbound nucleus $^{13}$ Be: One-neutron knockout reaction data from $^{14}$ Be analyzed in a holistic approach
journal, June 2013

Observation of 10He
journal, April 1994

Modeling interactions of intermediate-energy neutrons in a plastic scintillator array with Geant4
journal, August 2012

Low-lying neutron unbound states in ${}^{12}{Be}$
journal, August 2014

Systematic investigation of the drip-line nuclei 11Li and 14Be and their unbound subsystems 10Li and 13Be
journal, July 2007

Structure of $^{13}$ Be probed via secondary-beam reactions
journal, March 2014

Study of the ${}^{14}{Be}$ Continuum: Identification and Structure of its Second $2^{+}$ State
journal, December 2013

Lithium isotopes beyond the drip line
journal, September 2008

Properties of exotic p-shell nuclei
journal, July 1985

MoNA—The Modular Neutron Array
journal, June 2003

System Testing and Installation of the NHMFL/NSCL Sweeper Magnet
journal, June 2005

First observation of $^{15}$ Be
journal, September 2013

Observation of a two-neutron cascade from a resonance in ${}^{24}O$
journal, March 2011

Discovery of Two Isotopes, ${}^{14}{Be}$ and ${}^{17}B$ , at the Limits of Particle Stability
journal, August 1973

Low-lying intruder state of the unbound nucleus 13Be
journal, June 2010

Anomalous population of ${}^{10}{He}$ states in reactions with ${}^{11}{Li}$
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journal, February 2012

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journal, March 2012