Nuclear Data Sheets for A = 23

Firestone, R. B.

doi:10.1016/j.nds.2007.01.002

Cited by 79 publications

(88 citation statements)

References 169 publications

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“…Therefore we rule out a spin of 5/2 for the 7787-keV neighboring state and assign it spin-parity (7/2) + . This is more restrictive than the currently accepted spin-parity for the 7787-keV state (7/2 + ) [34]. Based on the proton intensity we observed for the decay of this state and the γ-ray intensities determined in Ref.…”

Section: B Resonance Strength Of the 7787 Kev Statementioning

confidence: 76%

“…[15]. The total proton-decay intensity of 1.15(6)% agrees with an earlier estimate from β-delayed γ-decay [25], but is higher than the adopted value 0.46(23)% adopted in the Nuclear Data Sheets [34].…”

Section: Discussionmentioning

confidence: 99%

“…5), of which the second was demonstrated to be the IAS of the T = 3/2 23 Al ground state. The energy we obtain for the lowest measured proton group indicates that these protons originate from a level with an energy of 7787(11) keV instead of the IAS (E ex = 7802.64(48) keV [25,34]), the state to which it was assigned in the previous works [13,15]. This identification is based on the energy matching, on the fact of the existence of these two states 16 keV apart and the strong population of the lower state in β-decay [17,25].…”

Section: A Comparison With Earlier Datamentioning

confidence: 99%

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Experimental study ofβ-delayed proton decay ofAl23for nucleosynthesis in novae

et al. 2011

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The β-delayed γ and proton decay of 23 Al has been studied with a novel detector setup at the focal plane of the MARS separator at Texas A&M University. We could detect protons down to an energy of 200 keV and determine the corresponding branching ratios. Contrary to results of previous β-decay studies, no strong proton intensity from the decay of the isobaric analog state (IAS) of the 23 Al ground state at Ex = 7803 keV in 23 Mg, was observed. Instead we assign the observed low energy group Ep,cm = 206 keV to the decay from a state 16 keV below the IAS. We measured both proton and gamma branches from the decay of this state at Ex = 7787 keV in 23 Mg, a very rare case in the literature. Combining our data with its measured lifetime, we determine its resonance strength to be ωγ = 1.4 +0.5 −0.4 meV. The value is in agreement with older direct measurements, but disagrees with a new direct measurement. This state is the most important resonance for the radiative proton capture 22 Na(p,γ) 23 Mg in some astrophysical environments, such as novae.

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Section: B Resonance Strength Of the 7787 Kev Statementioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: A Comparison With Earlier Datamentioning

confidence: 99%

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Experimental study ofβ-delayed proton decay ofAl23for nucleosynthesis in novae

et al. 2011

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“…All secondary decays from lower lying excited states in 23 Na were included in each decay cascade template using the branching ratios listed in Ref. [1]. Given that the resonance spin is J R = 1/2, transitions to all lower lying excited states with J = 1/2, 3/2, or 5/2 were considered here, but only those with a non-zero contribution were kept for the final fit to the data.…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

“…The E cm r = 458 keV resonance in the 22 Ne(p,γ) 23 Na reaction (E x = 9252.1 keV, S p = 8794.11 (2) keV [1]) is an ideal standard resonance for noble gas targets. Such a reference is important because of interest in the reactions that produce and destroy sodium in massive asymptotic giant branch stars.…”

Section: Introductionmentioning

confidence: 99%

New recommendedωγfor theErc.m.=458keV resonance in
Kelly
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Champagne
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Longland
³

et al. 2015
Phys. Rev. C

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The E cm r = 458 keV resonance in 22 Ne(p,γ) 23 Na is an ideal reference resonance for measurements of cross sections and resonance strengths in noble gas targets. We report on a new measurement of the strength of this resonance. Data analysis employed the TFractionFitter class of ROOT combined with Geant simulations of potential decay cascades from this resonance. This approach allowed us to extract precise primary branching ratios for decays from the resonant state, including a new primary branch to the 7082-keV state in 23 Na. Our new resonance strength of ωγ(458 keV) = 0.583(43) eV is more than 1-σ higher than a recent high-precision result that relied on literature branching ratios.

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