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Title: Neutron-unbound excited states of N 23

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 E 1 ~ 100 keV and E 2 ~ 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. Furthermore, the energy of the first state is about 1.3 MeV lower than the first excited 2 + in 24O. This decrease is largely due to coupling with the πp $$-1\atop{3/2}$$ hole along with a small reduction of the N = 16 shell gap in 23N.

Authors:
 [1];  [2];  [3];  [4];  [3];  [5];  [4];  [6];  [7];  [6];  [2];  [2];  [4];  [1];  [1];  [8];  [6];  [4];  [9];  [1]
  1. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Dept. of Physics and Astronomy
  2. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  3. Hope College, Holland, MI (United States). Dept. of Physics
  4. Augustana College, Sioux Falls, SD (United States). Dept. of Physics and Astronomy
  5. Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics
  6. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Dept. of Chemistry
  7. Indiana Univ., SouthBend, IN (United States). Dept. of Physics and Astronomy
  8. Gettysburg College, PA (United States). Dept. of Physics
  9. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Dept. of Physics and Astronomy, Joint Inst. for Nuclear Astrophysics
Publication Date:
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:
Journal Article: 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.
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. doi:10.1103/PhysRevC.95.044323.
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. doi:10.1103/PhysRevC.95.044323. https://www.osti.gov/servlets/purl/1407961.
@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 ~ 100 keV 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. Furthermore, the energy of the first state is about 1.3 MeV lower than the first excited 2+ in 24O. This decrease is largely due to coupling with the πp $-1\atop{3/2}$ hole along with a small reduction of the N = 16 shell gap in 23N.},
doi = {10.1103/PhysRevC.95.044323},
journal = {Physical Review C},
issn = {2469-9985},
number = 4,
volume = 95,
place = {United States},
year = {2017},
month = {4}
}

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