High-precision efficiency calibration of a high-purity co-axial germanium detector

Bertram Blank (1) , J. Souin (1) , P. Ascher (1) , L. Audirac (1) , G. Canchel (1) , M. Gerbaux (1) , S. Grevy (1) , J. Giovinazzo (1) , H. Guerin (1) , T. Kurtukian Nieto (1) , I. Matea (1) , H. Bouzomita (2) , P. Delahaye (2) , G.F. Grinyer (2) , J.C. Thomas (2)

1 NEX - Noyaux exotiques
2 GANIL - Grand Accélérateur National d'Ions Lourds

A high-purity co-axial germanium detector has been calibrated in efficiency to a precision of about 0.15% over a wide energy range. High-precision scans of the detector crystal and gamma-ray source measurements have been compared to Monte-Carlo simulations to adjust the dimensions of a detector model. For this purpose, standard calibration sources and short-lived on-line sources have been used. The resulting efficiency calibration reaches the precision needed e.g. for branching ratio measurements of super-allowed beta decays for tests of the weak-interaction standard model.

Mots clés: Super-allowed beta transitions; Monte-Carlosimulations; Gamma-ray spectroscopy; Germanium detector

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Instrumentations et Détecteurs [physics.ins-det]

Bertram Blank, J. Souin, P. Ascher, L. Audirac, G. Canchel, et al.. High-precision efficiency calibration of a high-purity co-axial germanium detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2015, 776, pp.34-44. ⟨10.1016/j.nima.2014.12.071⟩. ⟨in2p3-00975582⟩