Invariant-mass spectroscopy of O14 excited states

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.

doi:10.1103/PhysRevC.100.064305

Title: Invariant-mass spectroscopy of ${}^{14}O$ excited states

Journal Article · 05 December 2019 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.100.064305 · OSTI ID:1577258

^[1]; Brown, K. W. ^[2];

^[3]; Płoszajczak, M. ^[4]; Elson, J. M. ^[2]; Reviol, W. ^[2];

^[2]; Buhro, W. W. ^[5]; Chajecki, Z. ^[5]; Lynch, W. G. ^[5];

^[5]; Shane, R. ^[5]; Showalter, R. H. ^[5]; Tsang, M. B. ^[5]; Weisshaar, D. ^[5]; Winkelbauer, J. R. ^[5]; Bedoor, S. ^[6]; Wuosmaa, A. H. ^[7]

Washington Univ., St. Louis, MO (United States). Dept. of Chemistry; Washington University in St. Louis
Washington Univ., St. Louis, MO (United States). Dept. of Chemistry
Polish Academy of Sciences (PAS), Krakow (Poland). Inst. of Nuclear Physics
Grand Accélérateur National d’Ions Lourds (GANIL), Caen (France)
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. and Dept. of Physics and Astronomy
Western Michigan Univ., Kalamazoo MI (United States). Dept. of Physics
Western Michigan Univ., Kalamazoo MI (United States). Dept. of Physics; Univ. of Connecticut, Storrs, CT (United States). Dept. of Physics

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.

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Research Organization:: Washington Univ., St. Louis, MO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: FG02-87ER40316; FG02-04ER41320; SC0014552; NA0002135

OSTI ID:: 1577258

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 100; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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