A transmission time-of-flight system for particle identification at a recoil mass separator at low energies

Strength of theEc.m.=1113keV resonance in20NeChristian1, Hutcheon2, Akers3 et al. 2013Phys. Rev. CSelf Cite

“…Further evidence that the resonance strength is in the laboratory frame can be found in a contemporary paper by Tanner [10], where he states that 20 Ne (p, γ) 21 Na direct capture yield can be normalized to the yield of the E lab = 1169 keV resonance using the formula Y DC /Y R = 0.29σ ∆/ωγ, where σ is the direct capture cross section in barns. The factor of 0.29 b −1 is reproduced exactly by 2/λ 2 , where λ 2 = 7.0 b is the square of the laboratory de Broglie wavelength for an 1169 keV proton [7].…”

“…The strength of the E cm = 1113 keV resonance in 20 Ne (p, γ) 21 Na was recently measured using the DRAGON recoil mass spectrometer [6], part of the ISAC facility at TRI-UMF [15]. This experiment also served as commissioning of a new timestamp-based data acquisition system that will be detailed in an upcoming technical paper.…”

“…1, a strong 21 Na peak was clearly present 1 The conversion from lab to center-of-mass frame proceeds as follows: in the DSSSD energy sum spectrum with virtually no background from unreacted beam, allowing the resonance strength to be determined from the singles yield of 21 Na. As indicated in the figure, 21 Na events were selected by placing a cut on the main peak in the DSSSD energy spectrum. The resonance strength was calculated using the standard formula for thick target yield in inverse kinematics [18],…”

“…The 20 Ne (p, γ) 21 Na reaction is the starting point for the NeNa cycle [1], 20 Ne(p, γ) 21 Na(β + ν) 21 Ne(p, γ) 22 Na(β + ν) 22 Ne(p, γ) 23 Na(p, α) 20 Ne,…”

“…The cross section of 20 Ne (p, γ) 21 Na has been measured in the range of E cm = 0.35-2.0 MeV (E lab = 0.37-2.1 MeV) by Rolfs et al [1] and extrapolated to stellar energies. This experiment did not measure absolute yields and instead relied on normalization to the previously measured E cm = 1113 keV (E lab = 1169 keV) resonance as well as 16 O (p, γ) 17 F direct capture.…”