Nuclear astrophysics studies at the LENA facility: The -ray detection system

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

“…III, which are independent of the beam energy offset from the maximum resonance yield. The HPGe detector has been thoroughly characterized through extensive simulation studies using Geant (version 4.9.6) and measurements of both radioactive sources, such as 28 Si reactions [2,[11][12][13]. The critical dimensions used in the simulations were obtained from a CT scan of the detector [14].…”

“…The photopeak intensity, N γ , was different for each primary γ-ray, but remained constant with respect to the branching ratio set being analyzed. Geant simulations of the Ge detector used in this work have been shown to reproduce experimental full-energy peak efficiencies to within 3-5% [2,[11][12][13]. Therefore, simulated η p values at the primary γ-ray energies using mono-energetic Geant simulations of the detector geometry were used in Eq.…”

“…In nuclear astrophysics the methods of Ref. [35] have been used to correct data for coincidencesumming effects [11,12,36]. Additionally, expressions from Ref.…”

“…This spectrum is free of coincidence-summing effects. The f SC factors can then be calculated according to f SC = N γ,SC /N γ,N SC (11) where N γ,SC and N γ,N SC are the simulated photopeak intensities from the spectrum that is sum corrected (SC) and from the spectrum that is not sum corrected (N SC), respectively. Note that input of full-energy peak or total efficiencies or Q solid angle attenuation coefficients [19] are not required for this sum correction method.…”

New measurements of low-energy resonances in theNe22(p,γ)Na23reaction

“…The critical dimensions of the HPGe crystal were measured with a CT scan of the detector [37]. Past studies of the HPGe detector have included extensive geant simulations comparing experimentally measured and simulated γ-ray spectra of radioactive sources including 60 Co, 56 Co, and 137 Cs as well as (p,γ) resonances in 14 N, 18 O, 23 Na, and 27 Al target nuclei [17,34,38]. Comparisons similar to those carried out for the HPGe have been completed for the NaI using 60 Co, the 151-keV resonance in the 18 O(p,γ) 19 F reaction [35], and both resonant and DC spectra from the 17 O(p,γ) 18 F reaction [32].…”