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Title: β -delayed γ decay of P 26 : Possible evidence of a proton halo

Abstract

In this study, 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. 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. As a result, the absolute intensities of 26P β-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 26P β-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. 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 amore » proton halo in 26P.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [3];  [4];  [5];  [3];  [3];  [1];  [5];  [6];  [7];  [1];  [1];  [1];  [1];  [1] more »;  [1];  [8];  [1];  [9];  [1];  [3] « less
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Michigan State Univ., East Lansing, MI (United States); Kalamazoo College, Kalamazoo, MI (United States)
  3. McMaster Univ., Hamilton, ON (Canada)
  4. 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)
  5. Yale Univ., New Haven, CT (United States)
  6. Michigan State Univ., East Lansing, MI (United States); Univ. of Washington, Seattle, WA (United States)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. Michigan State Univ., East Lansing, MI (United States); Univ. of Southern Indiana, Evansville, IN (United States)
  9. Michigan State Univ., East Lansing, MI (United States); Univ. of Notre Dame, Notre Dame, IN (United States)
Publication Date:
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.
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. doi:10.1103/PhysRevC.93.064320.
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. doi:10.1103/PhysRevC.93.064320. https://www.osti.gov/servlets/purl/1454773.
@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 = {In this study, 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. 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. As a result, the absolute intensities of 26P β-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 26P β-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. 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 = {2016},
month = {6}
}

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