Invariant-mass spectroscopy of O14 excited states

doi:10.1103/PhysRevC.100.064305

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

Authors:

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

^[2]; Płoszajczak, M. ^[3]; Elson, J. M. ^[1]; Reviol, W. ^[1];

^[1]; Buhro, W. W. ^[4]; Chajecki, Z. ^[4]; Lynch, W. G. ^[4];

^[4]; Shane, R. ^[4]; Showalter, R. H. ^[4]; Tsang, M. B. ^[4]; Weisshaar, D. ^[4]; Winkelbauer, J. R. ^[4]; Bedoor, S. ^[5]; Wuosmaa, A. H. ^[6]

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

Publication Date:: 2019-12-06

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

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP); 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.

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                    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.

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                    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.  https://www.osti.gov/servlets/purl/1577258.

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@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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DOI: 10.1103/PhysRevC.100.064305

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Title: Invariant-mass spectroscopy of O 14 excited states

Abstract

Citation Formats

On the Origin of Nuclear Clustering journal, January 2012

Toward understanding the microscopic origin of nuclear clustering journal, August 2012

Consistent analysis of one-nucleon spectroscopic factors involving weakly- and strongly-bound nucleons journal, June 2016

Collectivization of anti-analog strength above charged particle thresholds journal, April 2018

Dynamics of quantum systems embedded in a continuum journal, February 2003

Observation of Long-Range Three-Body Coulomb Effects in the Decay of Ne 16 journal, December 2014

Interplay between sequential and prompt two-proton decay from the first excited state of Ne 16 journal, September 2015

Proton-decaying states in light nuclei and the first observation of Na 17 journal, April 2017

The high resolution array (HiRA) for rare isotope beam experiments journal, December 2007

Energy levels of light nuclei A = 13–15 journal, February 1991

CAESAR—A high-efficiency CsI(Na) scintillator array for in-beam spectroscopy with fast rare-isotope beams journal, December 2010

Invariant-mass spectroscopy of Ne 18 , O 16 , and C 10 excited states formed in neutron-transfer reactions journal, April 2019

Multiple angular scattering of heavy ions (16,17O, 40Ar, 86Kr and 100Mo) at intermediate energies (20–90 MeV/u) journal, September 1988

Coulomb shift in the mirror pair of C 14 and O 14 as a signature of the linear-chain structure journal, February 2019

N 13 + p elastic resonance scattering via a thick-target method journal, April 2008

Shell-model study of boron, carbon, nitrogen, and oxygen isotopes with a monopole-based universal interaction journal, June 2012

Level widths of O 14 states studied in the high-resolution N 14 ( He 3 , t ) O 14 reaction journal, April 2005

Gamow-Teller Strengths in the A = 14 Multiplet: A Challenge to the Shell Model journal, August 2006

Continuum spectroscopy with a C 10 beam: Cluster structure and three-body decay journal, August 2009

Angular Correlation of Nuclear Radiation journal, December 1953

Theory of Angular Correlation of Nuclear Radiations journal, July 1953

Spin alignment following inelastic scattering of Ne 17 , lifetime of F 16 , and its constraint on the continuum coupling strength journal, May 2018

Analysis of the capture reaction using the shell model embedded in the continuum journal, May 2000

Theory of the two-proton radioactivity in the continuum shell model journal, March 2006

Exceptional points in the scattering continuum journal, September 2009

Destruction of order in nuclear spectra by a residual GOE interaction journal, December 1983

Transitional regions of finite Fermi systems and quantum chaos journal, April 1991

Unexpected features of quantum degeneracies in a pairing model with two integrable limits journal, July 2009

Collectivity, phase transitions, and exceptional points in open quantum systems journal, September 1998

Repulsion of resonance states and exceptional points journal, January 2000

Experimental Observation of the Topological Structure of Exceptional Points journal, January 2001

Observation of a Chiral State in a Microwave Cavity journal, January 2003

Unfolding a diabolic point: a generalized crossing scenario journal, February 2003

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

On the Origin of Nuclear Clustering
journal, January 2012

Toward understanding the microscopic origin of nuclear clustering
journal, August 2012

Consistent analysis of one-nucleon spectroscopic factors involving weakly- and strongly-bound nucleons
journal, June 2016

Collectivization of anti-analog strength above charged particle thresholds
journal, April 2018

Dynamics of quantum systems embedded in a continuum
journal, February 2003

Observation of Long-Range Three-Body Coulomb Effects in the Decay of ${}^{16}{Ne}$
journal, December 2014

Interplay between sequential and prompt two-proton decay from the first excited state of ${}^{16}{Ne}$
journal, September 2015

Proton-decaying states in light nuclei and the first observation of ${}^{17}{Na}$
journal, April 2017

The high resolution array (HiRA) for rare isotope beam experiments
journal, December 2007

Energy levels of light nuclei A = 13–15
journal, February 1991

CAESAR—A high-efficiency CsI(Na) scintillator array for in-beam spectroscopy with fast rare-isotope beams
journal, December 2010

Invariant-mass spectroscopy of ${}^{18}{Ne}, {}^{16}O$ , and ${}^{10}C$ excited states formed in neutron-transfer reactions
journal, April 2019

Multiple angular scattering of heavy ions (16,17O, 40Ar, 86Kr and 100Mo) at intermediate energies (20–90 MeV/u)
journal, September 1988

Coulomb shift in the mirror pair of ${}^{14}C$ and ${}^{14}O$ as a signature of the linear-chain structure
journal, February 2019

${}^{13}N$ $+ p$ elastic resonance scattering via a thick-target method
journal, April 2008

Shell-model study of boron, carbon, nitrogen, and oxygen isotopes with a monopole-based universal interaction
journal, June 2012

Level widths of ${}^{14}O$ states studied in the high-resolution ${}^{14}N ({}^{3}{He}, t) {}^{14}O$ reaction
journal, April 2005

Gamow-Teller Strengths in the $A = 14$ Multiplet: A Challenge to the Shell Model
journal, August 2006

Continuum spectroscopy with a ${}^{10}C$ beam: Cluster structure and three-body decay
journal, August 2009

Angular Correlation of Nuclear Radiation
journal, December 1953

Theory of Angular Correlation of Nuclear Radiations
journal, July 1953

Spin alignment following inelastic scattering of ${}^{17}{Ne}$ , lifetime of ${}^{16}F$ , and its constraint on the continuum coupling strength
journal, May 2018

Analysis of the capture reaction using the shell model embedded in the continuum
journal, May 2000

Theory of the two-proton radioactivity in the continuum shell model
journal, March 2006

Exceptional points in the scattering continuum
journal, September 2009

Destruction of order in nuclear spectra by a residual GOE interaction
journal, December 1983

Transitional regions of finite Fermi systems and quantum chaos
journal, April 1991

Unexpected features of quantum degeneracies in a pairing model with two integrable limits
journal, July 2009

Collectivity, phase transitions, and exceptional points in open quantum systems
journal, September 1998

Repulsion of resonance states and exceptional points
journal, January 2000

Experimental Observation of the Topological Structure of Exceptional Points
journal, January 2001

Observation of a Chiral State in a Microwave Cavity
journal, January 2003

Unfolding a diabolic point: a generalized crossing scenario
journal, February 2003