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Title: Invariant-mass spectroscopy of O 14 excited states

Abstract

Excited states in 14O have been investigated both experimentally and theoretically. Experimentally, these states were produced via neutron-knockout reactions with a fast 15O beam and the invariant-mass technique was employed to isolate the 1 p and 2 p decay channels and determine their branching ratios. The spectrum of excited states was also calculated with the shell model embedded in the continuum that treats bound and scattering states in a unified model. By comparing energies, widths, and decay branching patterns, spin and parity assignments for all experimentally observed levels below 8 MeV are made. This includes the location of the second 2 +state that we find is in near degeneracy with the third 0 + state. An interesting case of sequential 2 p decay through a pair of degenerate 13N excited states with opposite parities was found where the interference between the two sequential decay pathways produces an unusual relative-angle distribution between the emitted protons.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2];  [3];  [1];  [1]; ORCiD logo [1];  [4];  [4];  [4]; ORCiD logo [4];  [4];  [4];  [4];  [4];  [4];  [5];  [6]
  1. Washington Univ., St. Louis, MO (United States). Dept. of Chemistry
  2. Polish Academy of Sciences (PAS), Krakow (Poland). Inst. of Nuclear Physics
  3. Grand Accélérateur National d’Ions Lourds (GANIL), Caen (France)
  4. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. and Dept. of Physics and Astronomy
  5. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Physics
  6. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Physics; Univ. of Connecticut, Storrs, CT (United States). Dept. of Physics
Publication Date:
Research Org.:
Washington Univ., St. Louis, MO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1577258
Grant/Contract Number:  
FG02-87ER40316; FG02-04ER41320; SC0014552; NA0002135; PHY-0606007; DGE-1143954
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 100; Journal Issue: 6; 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

Charity, R. J., Brown, K. W., Okołowicz, J., Płoszajczak, M., Elson, J. M., Reviol, W., Sobotka, L. G., Buhro, W. W., Chajecki, Z., Lynch, W. G., Manfredi, J., Shane, R., Showalter, R. H., Tsang, M. B., Weisshaar, D., Winkelbauer, J. R., Bedoor, S., and Wuosmaa, A. H. Invariant-mass spectroscopy of O14 excited states. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.100.064305.
Charity, R. J., Brown, K. W., Okołowicz, J., Płoszajczak, M., Elson, J. M., Reviol, W., Sobotka, L. G., Buhro, W. W., Chajecki, Z., Lynch, W. G., Manfredi, J., Shane, R., Showalter, R. H., Tsang, M. B., Weisshaar, D., Winkelbauer, J. R., Bedoor, S., & Wuosmaa, A. H. Invariant-mass spectroscopy of O14 excited states. United States. doi:10.1103/PhysRevC.100.064305.
Charity, R. J., Brown, K. W., Okołowicz, J., Płoszajczak, M., Elson, J. M., Reviol, W., Sobotka, L. G., Buhro, W. W., Chajecki, Z., Lynch, W. G., Manfredi, J., Shane, R., Showalter, R. H., Tsang, M. B., Weisshaar, D., Winkelbauer, J. R., Bedoor, S., and Wuosmaa, A. H. Fri . "Invariant-mass spectroscopy of O14 excited states". United States. doi:10.1103/PhysRevC.100.064305.
@article{osti_1577258,
title = {Invariant-mass spectroscopy of O14 excited states},
author = {Charity, R. J. and Brown, K. W. and Okołowicz, J. and Płoszajczak, M. and Elson, J. M. and Reviol, W. and Sobotka, L. G. and Buhro, W. W. and Chajecki, Z. and Lynch, W. G. and Manfredi, J. and Shane, R. and Showalter, R. H. and Tsang, M. B. and Weisshaar, D. and Winkelbauer, J. R. and Bedoor, S. and Wuosmaa, A. H.},
abstractNote = {Excited states in 14O have been investigated both experimentally and theoretically. Experimentally, these states were produced via neutron-knockout reactions with a fast 15O beam and the invariant-mass technique was employed to isolate the 1p and 2 p decay channels and determine their branching ratios. The spectrum of excited states was also calculated with the shell model embedded in the continuum that treats bound and scattering states in a unified model. By comparing energies, widths, and decay branching patterns, spin and parity assignments for all experimentally observed levels below 8 MeV are made. This includes the location of the second 2+state that we find is in near degeneracy with the third 0+ state. An interesting case of sequential 2 p decay through a pair of degenerate 13N excited states with opposite parities was found where the interference between the two sequential decay pathways produces an unusual relative-angle distribution between the emitted protons.},
doi = {10.1103/PhysRevC.100.064305},
journal = {Physical Review C},
number = 6,
volume = 100,
place = {United States},
year = {2019},
month = {12}
}

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