Neutron-unbound excited states of N23

Jones, M. D.; Baumann, T.; Brett, J.; Bullaro, J.; DeYoung, P. A.; Finck, J. E.; Frank, N.; Hammerton, K.; Hinnefeld, J.; Kohley, Z.; Kuchera, A. N.; Pereira, J.; Rabeh, A.; Smith, J. K.; Spyrou, A.; Stephenson, S. L.; Stiefel, K.; Tuttle-Timm, M.; Zegers, R. G.  T.; Thoennessen, M.

doi:10.1103/PhysRevC.95.044323

Title: Neutron-unbound excited states of ${}^{23}N$

Abstract

Neutron unbound states in ²³N were populated via proton knockout from an 83.4 MeV/nucleon ²⁴O beam on a liquid deuterium target. The two-body decay energy displays two peaks at E1~100keV and E2~1MeV with respect to the neutron separation energy. The data are consistent with shell model calculations predicting resonances at excitation energies of ~3.6MeV and ~4.5MeV. The selectivity of the reaction implies that these states correspond to the first and second 3/2- states. The energy of the first state is about 1.3 MeV lower than the first excited 2+ in O24. This decrease is largely due to coupling with the πp3/2-1 hole along with a small reduction of the N=16 shell gap in N23.

Authors:

Jones, M. D. ^[1]; Baumann, T. ^[2]; Brett, J. ^[3]; Bullaro, J. ^[4]; DeYoung, P. A. ^[3]; Finck, J. E. ^[5]; Frank, N. ^[4]; Hammerton, K. ^[6]; Hinnefeld, J. ^[7]; Kohley, Z. ^[6]; Kuchera, A. N. ^[2]; Pereira, J. ^[2]; Rabeh, A. ^[4]; Smith, J. K. ^[1]; Spyrou, A. ^[1]; Stephenson, S. L. ^[8]; Stiefel, K. ^[6]; Tuttle-Timm, M. ^[4]; Zegers, R. G. T. ^[9]; Thoennessen, M. ^[1]

Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Dept. of Physics and Astronomy
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Hope College, Holland, MI (United States). Dept. of Physics
Augustana College, Sioux Falls, SD (United States). Dept. of Physics and Astronomy
Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Dept. of Chemistry
Indiana Univ., SouthBend, IN (United States). Dept. of Physics and Astronomy
Gettysburg College, PA (United States). Dept. of Physics
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Dept. of Physics and Astronomy, Joint Inst. for Nuclear Astrophysics

Publication Date:: 2017-04-25

Research Org.:: Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

OSTI Identifier:: 1407961

Alternate Identifier(s):: OSTI ID: 1353135; OSTI ID: 1423618

Grant/Contract Number:: NA0003180; NA0000979; PHY14-04236; PHY12-05537; PHY11-02511; PHY11- 01745; PHY14-30152; PHY09-69058; PHY12-05357; AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 95; Journal Issue: 4; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Jones, M. D., Baumann, T., Brett, J., Bullaro, J., DeYoung, P. A., Finck, J. E., Frank, N., Hammerton, K., Hinnefeld, J., Kohley, Z., Kuchera, A. N., Pereira, J., Rabeh, A., Smith, J. K., Spyrou, A., Stephenson, S. L., Stiefel, K., Tuttle-Timm, M., Zegers, R. G.  T., and Thoennessen, M. Neutron-unbound excited states of N23.  United States: N. p., 2017. 
Web.  doi:10.1103/PhysRevC.95.044323.

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                    Jones, M. D., Baumann, T., Brett, J., Bullaro, J., DeYoung, P. A., Finck, J. E., Frank, N., Hammerton, K., Hinnefeld, J., Kohley, Z., Kuchera, A. N., Pereira, J., Rabeh, A., Smith, J. K., Spyrou, A., Stephenson, S. L., Stiefel, K., Tuttle-Timm, M., Zegers, R. G.  T., & Thoennessen, M. Neutron-unbound excited states of N23.  United States.  https://doi.org/10.1103/PhysRevC.95.044323

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                    Jones, M. D., Baumann, T., Brett, J., Bullaro, J., DeYoung, P. A., Finck, J. E., Frank, N., Hammerton, K., Hinnefeld, J., Kohley, Z., Kuchera, A. N., Pereira, J., Rabeh, A., Smith, J. K., Spyrou, A., Stephenson, S. L., Stiefel, K., Tuttle-Timm, M., Zegers, R. G.  T., and Thoennessen, M. Tue .  
"Neutron-unbound excited states of N23".  United States.  https://doi.org/10.1103/PhysRevC.95.044323.  https://www.osti.gov/servlets/purl/1407961.

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@article{osti_1407961,

  title        = {Neutron-unbound excited states of N23},

  author       = {Jones, M. D. and Baumann, T. and Brett, J. and Bullaro, J. and DeYoung, P. A. and Finck, J. E. and Frank, N. and Hammerton, K. and Hinnefeld, J. and Kohley, Z. and Kuchera, A. N. and Pereira, J. and Rabeh, A. and Smith, J. K. and Spyrou, A. and Stephenson, S. L. and Stiefel, K. and Tuttle-Timm, M. and Zegers, R. G.  T. and Thoennessen, M.},

  abstractNote = {Neutron unbound states in 23N were populated via proton knockout from an 83.4 MeV/nucleon 24O beam on a liquid deuterium target. The two-body decay energy displays two peaks at E1~100keV and E2~1MeV with respect to the neutron separation energy. The data are consistent with shell model calculations predicting resonances at excitation energies of ~3.6MeV and ~4.5MeV. The selectivity of the reaction implies that these states correspond to the first and second 3/2- states. The energy of the first state is about 1.3 MeV lower than the first excited 2+ in O24. This decrease is largely due to coupling with the πp3/2-1 hole along with a small reduction of the N=16 shell gap in N23.},

  doi          = {10.1103/PhysRevC.95.044323},

  journal      = {Physical Review C},

  number       = 4,

  volume       = 95,

  place        = {United States},

  year         = {2017},

  month        = {4}

}

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Works referencing / citing this record:

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Title: Neutron-unbound excited states of N 23

Abstract

Citation Formats

Exotic nuclei and nuclear forces journal, January 2013

One-Neutron Removal Measurement Reveals O 24 as a New Doubly Magic Nucleus journal, April 2009

In-beam γ-ray spectroscopy of the neutron-rich nitrogen isotopes N 19 − 22 journal, April 2008

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Spectroscopy of neutron-unbound 27 , 28 F journal, March 2012

N = 16 Spherical Shell Closure in O 24 journal, July 2012

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Direct Mass Measurements of B 19 , C 22 , F 29 , Ne 31 , Na 34 and Other Light Exotic Nuclei journal, November 2012

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First Observation of B 20 and B 21 journal, December 2018

Title: Neutron-unbound excited states of ${}^{23}N$

Exotic nuclei and nuclear forces
journal, January 2013

One-Neutron Removal Measurement Reveals ${}^{24}O$ as a New Doubly Magic Nucleus
journal, April 2009

In-beam γ-ray spectroscopy of the neutron-rich nitrogen isotopes ${}^{19 - 22}N$
journal, April 2008

Continuum shell model
journal, December 2006

The Shell-Model Code NuShellX@MSU
journal, June 2014

A new view of nuclear shells
journal, January 2013

Spectroscopy of neutron-unbound $^{27, 28}$ F
journal, March 2012

$N = 16$ Spherical Shell Closure in ${}^{24}O$
journal, July 2012

Liquid hydrogen and helium targets for radioisotope beams at RIKEN
journal, December 2005

Cross Sections for Products of 90-Mev Neutrons on Carbon
journal, April 1953

Evolution of Nuclear Shells due to the Tensor Force
journal, November 2005

Evidence for a doubly magic 24O
journal, February 2009

Novel Features of Nuclear Forces and Shell Evolution in Exotic Nuclei
journal, January 2010

COSY INFINITY Version 9
journal, March 2006

Reconstruction of nuclear charged fragment trajectories from a large-gap sweeper magnet
journal, October 2007

Disappearance of the $N = 14$ shell
journal, August 2009

Nuclear structure experiments along the neutron drip line
journal, February 2012

Direct Mass Measurements of ${}^{19}B$ , ${}^{22}C$ , ${}^{29}F$ , ${}^{31}{Ne}$ , ${}^{34}{Na}$ and Other Light Exotic Nuclei
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Two-neutron sequential decay of ${}^{24}O$
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journal, December 2018