Measurement of key resonances for the 24Al (p,γ) 25Si reaction rate using in-beam γ -ray spectroscopy

B. Longfellow; A. Gade; B.A. Brown; W.A. Richter; D. Bazin; P.C. Bender; M. Bowry; B. Elman; E. Lunderberg; D. Weisshaar; S.J. Williams

doi:10.1103/PhysRevC.97.054307

Measurement of key resonances for the ²⁴Al (p,γ) ²⁵Si reaction rate using in-beam γ -ray spectroscopy

B. Longfellow, A. Gade, B.A. Brown, W.A. Richter, D. Bazin, P.C. Bender, M. Bowry, B. Elman, E. Lunderberg, D. Weisshaar, S.J. Williams

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Abstract

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 γ-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,γ) 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 region of 0.22 GK as compared to a previous calculation. These shifts may be applicable to neighboring nuclei, impacting the proton capture rates in this region of the chart.

Original language	English
Article number	054307
Number of pages	8
Journal	Physical Review C
Volume	97
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.97.054307
Publication status	Published - 4 May 2018
Externally published	Yes

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@article{a819d9c1fd294190a8d2a6129272f149,

title = "Measurement of key resonances for the 24Al (p,γ) 25Si reaction rate using in-beam γ -ray spectroscopy",

abstract = "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 γ-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,γ) 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 region of 0.22 GK as compared to a previous calculation. These shifts may be applicable to neighboring nuclei, impacting the proton capture rates in this region of the chart.",

author = "B. Longfellow and A. Gade and B.A. Brown and W.A. Richter and D. Bazin and P.C. Bender and M. Bowry and B. Elman and E. Lunderberg and D. Weisshaar and S.J. Williams",

year = "2018",

month = may,

day = "4",

doi = "10.1103/PhysRevC.97.054307",

language = "English",

volume = "97",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

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T1 - Measurement of key resonances for the 24Al (p,γ) 25Si reaction rate using in-beam γ -ray spectroscopy

AU - Longfellow, B.

AU - Gade, A.

AU - Brown, B.A.

AU - Richter, W.A.

AU - Bazin, D.

AU - Bender, P.C.

AU - Bowry, M.

AU - Elman, B.

AU - Lunderberg, E.

AU - Weisshaar, D.

AU - Williams, S.J.

PY - 2018/5/4

Y1 - 2018/5/4

N2 - 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 γ-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,γ) 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 region of 0.22 GK as compared to a previous calculation. These shifts may be applicable to neighboring nuclei, impacting the proton capture rates in this region of the chart.

AB - 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 γ-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,γ) 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 region of 0.22 GK as compared to a previous calculation. These shifts may be applicable to neighboring nuclei, impacting the proton capture rates in this region of the chart.

U2 - 10.1103/PhysRevC.97.054307

DO - 10.1103/PhysRevC.97.054307

M3 - Article

SN - 2469-9985

VL - 97

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 054307

ER -

Measurement of key resonances for the 24Al (p,γ) 25Si reaction rate using in-beam γ -ray spectroscopy

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Measurement of key resonances for the ²⁴Al (p,γ) ²⁵Si reaction rate using in-beam γ -ray spectroscopy