Intercomparison of methods for coincidence summing corrections in gamma-ray spectrometry

New recommendedωγfor theErc.m.=458keV resonance inKelly1, Champagne2, Longland3 et al. 2015Phys. Rev. C

“…[6] by 11.3% (or about 1.2 σ). This increase extends to all higher-lying resonances in the 22 Ne(p,γ) 23 Na reaction.…”

“…An ion implantation energy of 100 keV was used, yielding a target thickness of approximately 20 keV at the resonance energy. The 22 Ne:Ta stoichiometry of the target used for this work was measured to be approximately 1:4 using the 458-keV resonance in 22 Ne(p,γ) 23 Na. The proton beam entered the target chamber through a copper tube, extending to less than 1 cm from the surface of the target.…”

“…The energy calibration was established to <1 keV by using well-known resonances of the reactions 18 O(p, γ) 19 F, 26 Mg(p, γ) 27 Al, and 27 Al(p, γ) 28 Si [10]. A target of 22 Ne implanted into a tantalum target backing was fabricated using the Eaton Ion Implanter located at the University of North Carolina at Chapel Hill. An ion implantation energy of 100 keV was used, yielding a target thickness of approximately 20 keV at the resonance energy.…”

“…Such a reference is important because of interest in the reactions that produce and destroy sodium in massive asymptotic giant branch stars. The sodium abundance is governed by the 20 Ne(p,γ) 21 Na, 22 Ne(p,γ) 23 Na, and 23 Na(p,γ) 24 Mg reactions, all of which have significant uncertainties at the energies of interest [2]. An improved determination of ωγ(458 keV) will thus facilitate more accurate measurements of the first two reactions.…”

“…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.…”