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

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

doi:10.1103/PhysRevC.93.064320

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

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

Nuclear Structure and Nuclear Astrophysi

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

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 P26 and compare the results with previous experimental results and shell-model calculations. Method: A P26 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 P26β-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 P26β decay. A complete β-decay scheme was built for the allowed transitions to bound excited states of Si26. ft values and Gamow-Teller strengths were also determined for these transitions and compared with shell-model calculations and the mirror β decay of Na26, 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 P26.

Original language	English
Article number	064320
Journal	Physical Review C
Volume	93
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.93.064320
State	Published - Jun 20 2016

Funding

This work is supported by the U.S. National Science Foundation under Grants No. PHY-1102511, No. PHY-0822648, No. PHY-1350234, and No. PHY-1404442, the U.S. Department of Energy under Contract No. DE-FG02-97ER41020, the U.S. National Nuclear Security Agency under Contract No. DE-NA0000979, and the Natural Sciences and Engineering Research Council of Canada.

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10.1103/PhysRevC.93.064320

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Pérez-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., ... Thiagalingam, E. (2016). β -delayed γ decay of P 26: Possible evidence of a proton halo. Physical Review C, 93(6), Article 064320. https://doi.org/10.1103/PhysRevC.93.064320

@article{95a98daebd2143288bede4814c217212,

title = "β -delayed γ decay of P 26: 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 P26 and compare the results with previous experimental results and shell-model calculations. Method: A P26 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 P26β-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 P26β decay. A complete β-decay scheme was built for the allowed transitions to bound excited states of Si26. ft values and Gamow-Teller strengths were also determined for these transitions and compared with shell-model calculations and the mirror β decay of Na26, 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 P26.",

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

note = "Publisher Copyright: {\textcopyright} 2016 American Physical Society.",

year = "2016",

month = jun,

day = "20",

doi = "10.1103/PhysRevC.93.064320",

language = "English",

volume = "93",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "6",

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Pérez-Loureiro, D, Wrede, C, Bennett, MB, Liddick, SN, Bowe, A, Brown, BA, Chen, AA, Chipps, KA, Cooper, N, Irvine, D, McNeice, E, Montes, F, Naqvi, F, Ortez, R, Pain, SD, Pereira, J, Prokop, CJ, Quaglia, J, Quinn, SJ, Sakstrup, J, Santia, M, Schwartz, SB, Shanab, S, Simon, A, Spyrou, A & Thiagalingam, E 2016, 'β -delayed γ decay of P 26: Possible evidence of a proton halo', Physical Review C, vol. 93, no. 6, 064320. https://doi.org/10.1103/PhysRevC.93.064320

TY - JOUR

T1 - β -delayed γ decay of P 26

T2 - Possible evidence of a proton halo

AU - Pérez-Loureiro, D.

AU - Wrede, C.

AU - Bennett, M. B.

AU - Liddick, S. N.

AU - Bowe, A.

AU - Brown, B. A.

AU - Chen, A. A.

AU - Chipps, K. A.

AU - Cooper, N.

AU - Irvine, D.

AU - McNeice, E.

AU - Montes, F.

AU - Naqvi, F.

AU - Ortez, R.

AU - Pain, S. D.

AU - Pereira, J.

AU - Prokop, C. J.

AU - Quaglia, J.

AU - Quinn, S. J.

AU - Sakstrup, J.

AU - Santia, M.

AU - Schwartz, S. B.

AU - Shanab, S.

AU - Simon, A.

AU - Spyrou, A.

AU - Thiagalingam, E.

PY - 2016/6/20

Y1 - 2016/6/20

N2 - 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 P26 and compare the results with previous experimental results and shell-model calculations. Method: A P26 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 P26β-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 P26β decay. A complete β-decay scheme was built for the allowed transitions to bound excited states of Si26. ft values and Gamow-Teller strengths were also determined for these transitions and compared with shell-model calculations and the mirror β decay of Na26, 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 P26.

AB - 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 P26 and compare the results with previous experimental results and shell-model calculations. Method: A P26 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 P26β-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 P26β decay. A complete β-decay scheme was built for the allowed transitions to bound excited states of Si26. ft values and Gamow-Teller strengths were also determined for these transitions and compared with shell-model calculations and the mirror β decay of Na26, 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 P26.

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U2 - 10.1103/PhysRevC.93.064320

DO - 10.1103/PhysRevC.93.064320

M3 - Article

AN - SCOPUS:84975691169

SN - 2469-9985

VL - 93

JO - Physical Review C

JF - Physical Review C

IS - 6

M1 - 064320

ER -

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

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