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

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

Journal Article · Mon Jun 20 00:00:00 EDT 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.93.064320· OSTI ID:1454773

Perez-Loureiro, D. ^[1]; Wrede, C. ^[2]; Bennett, M. B. ^[2]; Liddick, S. N. ^[2]; Bowe, A. ^[3]; Brown, B. A. ^[2]; Chen, A. A. ^[4]; Chipps, K. A. ^[5]; Cooper, N. ^[6]; Irvine, D. ^[4]; McNeice, E. ^[4]; Montes, F. ^[2]; Naqvi, F. ^[6]; Ortez, R. ^[7]; Pain, S. D. ^[8]; Pereira, J. ^[2]; Prokop, C. J. ^[2]; Quaglia, J. ^[2]; Quinn, S. J. ^[2]; Sakstrup, J. ^[2] more »

Michigan State Univ., East Lansing, MI (United States); UC Berkeley
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)

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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

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

OSTI ID:: 1454773

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

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 93; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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