β -delayed γ decay of P26: Possible evidence of a proton halo

Perez-Loureiro, D.; Wrede, C.; Bennett, M. B.; Liddick, S. N.; Bowe, A.; Brown, B. A.; Chen, A. A.; Chipps, K. A.; Cooper, N.; Irvine, D.; McNeice, E.; Montes, F.; Naqvi, F.; Ortez, R.; Pain, S. D.; Pereira, J.; Prokop, C. J.; Quaglia, J.; Quinn, S. J.; Sakstrup, J.; Santia, M.; Schwartz, S. B.; Shanab, S.; Simon, A.; Spyrou, A.; Thiagalingam, E.

doi:10.1103/PhysRevC.93.064320

Title: $β$ -delayed $γ$ decay of ${}^{26}P$ : Possible evidence of a proton halo

Abstract

Background: Measurements of β decay provide important nuclear structure information that can be used to probe isospin asymmetries and inform nuclear astrophysics studies.Purpose: To measure the β-delayed γ decay of 26P and compare the results with previous experimental results and shell-model calculations.Method: A 26P fast beam produced using nuclear fragmentation was implanted into a planar germanium detector. Its β-delayed γ-ray emission was measured with an array of 16 high-purity germanium detectors. Positrons emitted in the decay were detected in coincidence to reduce the background.Results: The absolute intensities of 26Pβ-delayed γ rays were determined. A total of six new β-decay branches and 15 new γ-ray lines have been observed for the first time in 26Pβ decay. A complete β-decay scheme was built for the allowed transitions to bound excited states of 26Si. ft values and Gamow-Teller strengths were also determined for these transitions and compared with shell-model calculations and the mirror β decay of 26Na, revealing significant mirror asymmetries.Conclusions: A very good agreement with theoretical predictions based on the USDB shell model is observed. The significant mirror asymmetry observed for the transition to the first excited state (δ=51(10)%) may be evidence for a proton halo in 26P.

Authors:

Perez-Loureiro, D. ^[1]; Wrede, C. ^[1]; Bennett, M. B. ^[1]; Liddick, S. N. ^[1]; Bowe, A. ^[2]; Brown, B. A. ^[1]; Chen, A. A. ^[3]; Chipps, K. A. ^[4]; Cooper, N. ^[5]; Irvine, D. ^[3]; McNeice, E. ^[3]; Montes, F. ^[1]; Naqvi, F. ^[5]; Ortez, R. ^[6]; Pain, S. D. ^[7]; Pereira, J. ^[1]; Prokop, C. J. ^[1]; Quaglia, J. ^[1]; Quinn, S. J. ^[1]; Sakstrup, J. ^[1] more »

Michigan State Univ., East Lansing, MI (United States)
Michigan State Univ., East Lansing, MI (United States); Kalamazoo College, Kalamazoo, MI (United States)
McMaster Univ., Hamilton, ON (Canada)
Colorado School of Mines, Golden, CO (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Yale Univ., New Haven, CT (United States)
Michigan State Univ., East Lansing, MI (United States); Univ. of Washington, Seattle, WA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Michigan State Univ., East Lansing, MI (United States); Univ. of Southern Indiana, Evansville, IN (United States)
Michigan State Univ., East Lansing, MI (United States); Univ. of Notre Dame, Notre Dame, IN (United States)

Publication Date:: Mon Jun 20 00:00:00 EDT 2016

Research Org.:: Univ. of California, Berkeley, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1454773

Alternate Identifier(s):: OSTI ID: 1258306; OSTI ID: 1471880

Grant/Contract Number:: NA0000979; FG02-97ER41020; AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 93; 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


                    Perez-Loureiro, D., Wrede, C., Bennett, M. B., Liddick, S. N., Bowe, A., Brown, B. A., Chen, A. A., Chipps, K. A., Cooper, N., Irvine, D., McNeice, E., Montes, F., Naqvi, F., Ortez, R., Pain, S. D., Pereira, J., Prokop, C. J., Quaglia, J., Quinn, S. J., Sakstrup, J., Santia, M., Schwartz, S. B., Shanab, S., Simon, A., Spyrou, A., and Thiagalingam, E. β -delayed γ decay of P26: Possible evidence of a proton halo.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevC.93.064320.

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                    Perez-Loureiro, D., Wrede, C., Bennett, M. B., Liddick, S. N., Bowe, A., Brown, B. A., Chen, A. A., Chipps, K. A., Cooper, N., Irvine, D., McNeice, E., Montes, F., Naqvi, F., Ortez, R., Pain, S. D., Pereira, J., Prokop, C. J., Quaglia, J., Quinn, S. J., Sakstrup, J., Santia, M., Schwartz, S. B., Shanab, S., Simon, A., Spyrou, A., & Thiagalingam, E. β -delayed γ decay of P26: Possible evidence of a proton halo.  United States.  https://doi.org/10.1103/PhysRevC.93.064320

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                    Perez-Loureiro, D., Wrede, C., Bennett, M. B., Liddick, S. N., Bowe, A., Brown, B. A., Chen, A. A., Chipps, K. A., Cooper, N., Irvine, D., McNeice, E., Montes, F., Naqvi, F., Ortez, R., Pain, S. D., Pereira, J., Prokop, C. J., Quaglia, J., Quinn, S. J., Sakstrup, J., Santia, M., Schwartz, S. B., Shanab, S., Simon, A., Spyrou, A., and Thiagalingam, E. Mon .  
"β -delayed γ decay of P26: Possible evidence of a proton halo".  United States.  https://doi.org/10.1103/PhysRevC.93.064320.  https://www.osti.gov/servlets/purl/1454773.

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@article{osti_1454773,

  title        = {β -delayed γ decay of P26: Possible evidence of a proton halo},

  author       = {Perez-Loureiro, D. and Wrede, C. and Bennett, M. B. and Liddick, S. N. and Bowe, A. and Brown, B. A. and Chen, A. A. and Chipps, K. A. and Cooper, N. and Irvine, D. and McNeice, E. and Montes, F. and Naqvi, F. and Ortez, R. and Pain, S. D. and Pereira, J. and Prokop, C. J. and Quaglia, J. and Quinn, S. J. and Sakstrup, J. and Santia, M. and Schwartz, S. B. and Shanab, S. and Simon, A. and Spyrou, A. and Thiagalingam, E.},

  abstractNote = {Background: Measurements of β decay provide important nuclear structure information that can be used to probe isospin asymmetries and inform nuclear astrophysics studies.Purpose: To measure the β-delayed γ decay of 26P and compare the results with previous experimental results and shell-model calculations.Method: A 26P fast beam produced using nuclear fragmentation was implanted into a planar germanium detector. Its β-delayed γ-ray emission was measured with an array of 16 high-purity germanium detectors. Positrons emitted in the decay were detected in coincidence to reduce the background.Results: The absolute intensities of 26Pβ-delayed γ rays were determined. A total of six new β-decay branches and 15 new γ-ray lines have been observed for the first time in 26Pβ decay. A complete β-decay scheme was built for the allowed transitions to bound excited states of 26Si. ft values and Gamow-Teller strengths were also determined for these transitions and compared with shell-model calculations and the mirror β decay of 26Na, revealing significant mirror asymmetries.Conclusions: A very good agreement with theoretical predictions based on the USDB shell model is observed. The significant mirror asymmetry observed for the transition to the first excited state (δ=51(10)%) may be evidence for a proton halo in 26P.},

  doi          = {10.1103/PhysRevC.93.064320},

  journal      = {Physical Review C},

  number       = 6,

  volume       = 93,

  place        = {United States},

  year         = {Mon Jun 20 00:00:00 EDT 2016},

  month        = {Mon Jun 20 00:00:00 EDT 2016}

}

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Energy levels and branching ratios for the rp-process nucleus 25Si were determined from the reactions 9Be(26Si,25Si)X and 9Be(25Al,25Si)X using in-beam gamma-ray spectroscopy with both high-efficiency and high-resolution detector arrays. Proton-unbound states at 3695(14) and 3802(11) keV were identified and assigned tentative spins and parities based on comparison to theory and the mirror nucleus. The 24Al(p,gamma)25Si reaction rate was calculated using the experimental states and states from charge-dependent USDA and USDB shell-model calculations with downward shifts of the 1s1/2 proton orbital to account for the observed Thomas-Ehrman shift, leading to a factor of 10-100 increase in rate for the temperature regionmore »« less
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https://doi.org/10.1103/PhysRevC.97.054307

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²⁵Siβ⁺-decay spectroscopy

Journal Article Sun, L. J. ; Friedman, M. ; Budner, T. ; ... - Physical Review C

Background: β-decay spectroscopy provides valuable information on exotic nuclei and a stringent test for nuclear theories beyond the stability line. Purpose: To search for new β-delayed protons and γ rays of ²⁵Si to investigate the properties of ²⁵Al excited states. Method: ²⁵Si β decays were measured by using the Gaseous Detector with Germanium Tagging system at the National Superconducting Cyclotron Laboratory. The protons and γ rays emitted in the decay were detected simultaneously. Here, a Monte Carlo method was used to model the Doppler broadening of ²⁴Mg γ-ray lines caused by nuclear recoil from proton emission. Shell-model calculations using twomore »« less
https://doi.org/10.1103/physrevc.103.014322

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Citation Formats

Coincidence summing in gamma-ray spectroscopy journal, May 1990

Total interaction and proton-removal cross-section measurements for the proton-rich isotopes 7Be, 8B, and 9C journal, October 1997

Predicted features of the beta decay of neutron-rich sd -shell nuclei journal, September 1983

Nuclear Data Sheets for A = 24 journal, November 2007

The cluster–core model for the halo structure of light nuclei at the drip lines journal, March 2002

High efficiency beta-decay spectroscopy using a planar germanium double-sided strip detector journal, November 2013

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The essential decay of pandemonium: A demonstration of errors in complex beta-decay schemes journal, November 1977

Interaction cross sections and radii of light nuclei journal, October 1996

Supplement to energy levels of A = 21–44 nuclei (VII) journal, April 1998

On the -decay of C journal, September 2001

Magnetic moment of proton drip-line nucleus 9C journal, May 1995

Digital data acquisition system implementation at the National Superconducting Cyclotron Laboratory journal, March 2014

First-forbidden β decay of 17 N and 17 Ne journal, April 1997

Spectroscopy of Radioactive Beams from Single-Nucleon Knockout Reactions: Application to the sd Shell Nuclei A 25 l and P 2 6 , 2 7 , 2 8 journal, December 1998

Renormalization of the Axial-Vector Coupling Constant in Nuclear β Decay journal, March 1973

Thermonuclear Al 25 ( p , γ ) Si 26 reaction rate in classical novae and Galactic Al 26 journal, March 2009

Observation of Doppler broadening in β -delayed proton- γ decay journal, September 2015

First observation of an isomeric state in proton drip-line nucleus 26 P journal, January 2014

One-proton halo in P 26 and two-proton halo in S 27 journal, February 1996

Level structure of Si 26 and its implications for the astrophysical reaction rate of Al 25 ( p ,γ) Si 26 journal, June 2007

Relativistic Mean Field Study on Halo Structures of Mirror Nuclei journal, February 2009

Recent experimental progress in nuclear halo structure studies journal, January 2013

Proton halos in the 1s0d shell journal, July 1996

Limits to second-class nucleonic and mesonic currents journal, March 2000

Lowest l = 0 proton resonance in Si 26 and implications for nucleosynthesis of Al 26 journal, March 2009

Commissioning the A1900 projectile fragment separator journal, May 2003

Possibility of a two-proton halo in 17Ne journal, October 2003

Thirty-two-fold segmented germanium detectors to identify γ-rays from intermediate-energy exotic beams journal, July 2001

Microscopic four-cluster description of the mirror nuclei Li 9 and C 9 journal, December 1995

Beta-delayed proton decay of the Tz = −2 isotope 26P journal, March 1983

Second-Class Currents journal, February 1977

Classical-Nova Contribution to the Milky Way’s Al 26 Abundance: Exit Channel of the Key Al 25 ( p , γ ) Si 26 Resonance journal, December 2013

Superallowed 0 + → 0 + nuclear β decays: 2014 critical survey, with precise results for V u d and CKM unitarity journal, February 2015

Beta-decay properties of 25 Si and 26 P journal, September 2004

High precision measurements of Na 26 β − decay journal, April 2005

Super-allowed Fermi β decay: Half-lives of O 14 and K m 38 journal, July 1978

Beta-delayed two-proton decays of Al 22 and P 26 journal, October 1984

Effects of Pairing Correlations on Formation of Proton Halo in 9 C journal, September 2010

Beta-decay to the proton halo state in 17F journal, November 1993

Large asymmetry in the strongest β-transition for A=9 journal, December 2003

The Ame2012 atomic mass evaluation journal, December 2012

Second class currents in nuclear beta-decay? journal, March 1970

Geant4—a simulation toolkit journal, July 2003

Structure of resonances in the Gamow burning window for the Al 25 ( p , γ ) Si 26 reaction in novae journal, September 2015

Excited states above the proton threshold in 26Si journal, September 2014

Gamow-Teller beta-decay rates for A ≤18 nuclei journal, January 1993

On the asymmetry of Gamow–Teller β-decay rates in mirror nuclei in relation with second-class currents journal, February 2003

Radio Frequency Fragment Separator at NSCL journal, July 2009

Interaction cross sections and radii of the mass number A=17 isobar (17N, 17F, and 17Ne) journal, August 1994

Renormalization of the axial-vector coupling constant in nuclear β-decay (II) journal, July 1973

Measurement of the -decay branching ratio of into the first excited state of journal, January 1998

Effective g A in the pf shell journal, June 1996

New stellar reaction rates for Mg 25 ( p ,γ ) 26 Al and Al 25 ( p ,γ ) 26 Si journal, January 1996

The Ame2012 atomic mass evaluation journal, December 2012

The cluster-core model for halo-structure of light nuclei at the drip lines text, January 2011

Beta-decay properties of $^{25}$Si and $^{26}$P text, January 2004

On the asymmetry of Gamow-Teller beta-decay rates in mirror nuclei in relation with second-class currents text, January 2002

Neutrino Spectra from Nuclear Weak Interactions in sd -Shell Nuclei under Astrophysical Conditions journal, January 2018

Title: $β$ -delayed $γ$ decay of ${}^{26}P$ : Possible evidence of a proton halo

Coincidence summing in gamma-ray spectroscopy
journal, May 1990

Total interaction and proton-removal cross-section measurements for the proton-rich isotopes 7Be, 8B, and 9C
journal, October 1997

Predicted features of the beta decay of neutron-rich $sd$ -shell nuclei
journal, September 1983

Nuclear Data Sheets for A = 24
journal, November 2007

The cluster–core model for the halo structure of light nuclei at the drip lines
journal, March 2002

High efficiency beta-decay spectroscopy using a planar germanium double-sided strip detector
journal, November 2013

A new interaction for the sd shell?
journal, January 2005

A parametrization of the phase space factor for allowed β-decay
journal, October 1974

The essential decay of pandemonium: A demonstration of errors in complex beta-decay schemes
journal, November 1977

Interaction cross sections and radii of light nuclei
journal, October 1996

Supplement to energy levels of A = 21–44 nuclei (VII)
journal, April 1998

On the -decay of C
journal, September 2001

Magnetic moment of proton drip-line nucleus 9C
journal, May 1995

Digital data acquisition system implementation at the National Superconducting Cyclotron Laboratory
journal, March 2014

First-forbidden $β$ decay of $^{17}$ N and $^{17}$ Ne
journal, April 1997

Spectroscopy of Radioactive Beams from Single-Nucleon Knockout Reactions: Application to the $sd$ Shell Nuclei ${}^{25}A l$ and ${}^{26, 27, 28}P$
journal, December 1998

Renormalization of the Axial-Vector Coupling Constant in Nuclear $β$ Decay
journal, March 1973

Thermonuclear ${}^{25}{Al} (p, γ) {}^{26}{Si}$ reaction rate in classical novae and Galactic ${}^{26}{Al}$
journal, March 2009

Observation of Doppler broadening in $β$ -delayed proton- $γ$ decay
journal, September 2015

First observation of an isomeric state in proton drip-line nucleus ²⁶ P
journal, January 2014

One-proton halo in ${}^{26}P$ and two-proton halo in ${}^{27}S$
journal, February 1996

Level structure of ${}^{26}{Si}$ and its implications for the astrophysical reaction rate of ${}^{25}{Al}$ ( $p$ ,γ) ${}^{26}{Si}$
journal, June 2007

Relativistic Mean Field Study on Halo Structures of Mirror Nuclei
journal, February 2009

Recent experimental progress in nuclear halo structure studies
journal, January 2013

Proton halos in the 1s0d shell
journal, July 1996

Limits to second-class nucleonic and mesonic currents
journal, March 2000

Lowest $l = 0$ proton resonance in ${}^{26}{Si}$ and implications for nucleosynthesis of ${}^{26}{Al}$
journal, March 2009

Commissioning the A1900 projectile fragment separator
journal, May 2003

Possibility of a two-proton halo in 17Ne
journal, October 2003

Thirty-two-fold segmented germanium detectors to identify γ-rays from intermediate-energy exotic beams
journal, July 2001

Microscopic four-cluster description of the mirror nuclei ${}^{9}{Li}$ and ${}^{9}C$
journal, December 1995

Beta-delayed proton decay of the Tz = −2 isotope 26P
journal, March 1983

Second-Class Currents
journal, February 1977

Classical-Nova Contribution to the Milky Way’s ${}^{26}{Al}$ Abundance: Exit Channel of the Key ${}^{25}{Al} (p, γ) {}^{26}{Si}$ Resonance
journal, December 2013

Superallowed $0^{+} \to 0^{+}$ nuclear $β$ decays: 2014 critical survey, with precise results for $V_{u d}$ and CKM unitarity
journal, February 2015

Beta-decay properties of 25 Si and 26 P
journal, September 2004

High precision measurements of ${}^{26}{Na} β^{-}$ decay
journal, April 2005

Super-allowed Fermi $β$ decay: Half-lives of ${}^{14}O$ and ${}^{38}K^{m}$
journal, July 1978

Beta-delayed two-proton decays of ${}^{22}{Al}$ and ${}^{26}P$
journal, October 1984

Effects of Pairing Correlations on Formation of Proton Halo in ⁹ C
journal, September 2010

Beta-decay to the proton halo state in 17F
journal, November 1993

Large asymmetry in the strongest β-transition for A=9
journal, December 2003

The Ame2012 atomic mass evaluation
journal, December 2012

Second class currents in nuclear beta-decay?
journal, March 1970

Geant4—a simulation toolkit
journal, July 2003

Structure of resonances in the Gamow burning window for the ${}^{25}{Al} (p, γ) {}^{26}{Si}$ reaction in novae
journal, September 2015

Excited states above the proton threshold in 26Si
journal, September 2014

Gamow-Teller beta-decay rates for A ≤18 nuclei
journal, January 1993

On the asymmetry of Gamow–Teller β-decay rates in mirror nuclei in relation with second-class currents
journal, February 2003

Radio Frequency Fragment Separator at NSCL
journal, July 2009

Interaction cross sections and radii of the mass number A=17 isobar (17N, 17F, and 17Ne)
journal, August 1994

Renormalization of the axial-vector coupling constant in nuclear β-decay (II)
journal, July 1973

Measurement of the -decay branching ratio of into the first excited state of
journal, January 1998

Effective $g_{A}$ in the $pf$ shell
journal, June 1996

New stellar reaction rates for ${}^{25}{Mg}$ ( p ,γ $)^{26}$ Al and ${}^{25}{Al}$ ( p ,γ $)^{26}$ Si
journal, January 1996

The Ame2012 atomic mass evaluation
journal, December 2012

The cluster-core model for halo-structure of light nuclei at the drip lines
text, January 2011

Beta-decay properties of $^{25}$Si and $^{26}$P
text, January 2004

On the asymmetry of Gamow-Teller beta-decay rates in mirror nuclei in relation with second-class currents
text, January 2002

Neutrino Spectra from Nuclear Weak Interactions in sd -Shell Nuclei under Astrophysical Conditions
journal, January 2018