TY  - JOUR
AU  - AGATA Collaboration (Soderstrom, P. A. et al
AU  - Gadea, A.
PY  - 2011
DA  - 2011//
TI  - Interaction position resolution simulations and in-beam measurements of the AGATA HPGe detectors
T2  - Nucl. Instrum. Methods Phys. Res. A
JO  - Nuclear Instruments & Methods in Physics Research A
SP  - 96
EP  - 109
VL  - 638
IS  - 1
PB  - Elsevier Science Bv
KW  - gamma-ray tracking
KW  - AGATA
KW  - Monte Carlo simulations
KW  - HPGe detectors
KW  - Fusion-evaporation reactions
AB  - The interaction position resolution of the segmented HPGe detectors of an AGATA triple cluster detector has been studied through Monte Carlo simulations and in an in-beam experiment. A new method based on measuring the energy resolution of Doppler-corrected gamma-ray spectra at two different target to detector distances is described. This gives the two-dimensional position resolution in the plane perpendicular to the direction of the emitted gamma-ray. The gamma-ray tracking was used to determine the full energy of the gamma-rays and the first interaction point, which is needed for the Doppler correction. Five different heavy-ion induced fusion-evaporation reactions and a reference reaction were selected for the simulations. The results of the simulations show that the method works very well and gives a systematic deviation of <1 mm in the FVVHM of the interaction position resolution for the gamma-ray energy range from 60 keV to 5 MeV. The method was tested with real data from an in-beam measurement using a (30)5i beam at 64 MeV on a thin C-12 target. Pulse-shape analysis of the digitized detector waveforms and gamma-ray tracking was performed to determine the position of the first interaction point, which was used for the Doppler corrections. Results of the dependency of the interaction position resolution on the gamma-ray energy and on the energy, axial location and type of the first interaction point, are presented. The FVVHM of the interaction position resolution varies roughly linearly as a function of gamma-ray energy from 8.5 mm at 250 key to 4 mm at 1.5 MeV, and has an approximately constant value of about 4 mm in the gamma-ray energy range from 1.5 to 4 MeV.
SN  - 0168-9002
UR  - https://doi.org/10.1016/j.nima.2011.02.089
DO  - 10.1016/j.nima.2011.02.089
LA  - English
N1  - ISI:000290082600015
ID  - AGATACollaborationSoderstrom+Gadea2011
ER  -