Detector-efficiency calibration for high-energy gamma-rays

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Abstract

Compton-suppressed gamma-ray spectra of several strong (p, γ) resonances have been measured with good statistics. Accurate decay schemes have been deduced from these data, which are useful for precision efficiency calibration of gamma-ray detectors at energies beyond those available from radioactive sources (Eγ < 3.5 MeV). It is shown that the Ep = 1318 and 1417 keV23Na(p, γ)24Mg and the Ep = 767, 992 and 1317 keV27Al(p, γ)28Si resonance are especially well suited for this purpose. The relative intensities of the relevant gamma-rays, with energies up to Eγ = 11.6 MeV, have been determined with an accuracy of the order of 0.5%. Furthermore, 11B(p, γ)12C spectra at Ep = 675, 1388 and 2626 keV have been measured, in order to investigate the feasibility of extending the efficiency calibrations to even higher energies.

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