Gamma-ray tracking with segmented HPGe detectors

• Autor(a) principal: Wieland,O.
• Data de Publicação: 2003
• Outros Autores: Kröll,Th., Bazzacco,D., Venturelli,R., Camera,F., Million,B., Musso,E., Quintana,B., Ur,C. A., Bellato,M., Isocrate,R., Manea,Ch., Menegazzo,R., Pavan,P., Rossi Alvarez,C., Farnea,E., Gadea,A., Rosso,D., Spolaore,P., Pullia,A., Casati,G., Geraci,A., Ripamonti,G., Descovich,M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Brazilian Journal of Physics
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332003000200007

This paper gives a brief overview of the technical progress that can be achieved with the newly available segmented HPGe detectors. Gamma-ray tracking detectors are a new generation of HPGe detectors which are currently being developed to improve significantly the efficiency and resolving power of the 4pi germanium detectors arrays for high-precision gamma-ray spectroscopy. They consist of highly segmented HPGe detectors associated with fast digital front-end electronics. Through the pulse-shape analysis of the signals it is possible to extract the energy, timing and spatial information on the few interactions a gamma-ray undergoes in the HPGe detector. The tracks of the gamma-rays in the HPGe detector can then be reconstructed in three dimensions based on the Compton scattering formula. Such a detector has been used for the first time during an in-beam experiment. The gamma-decay of the Coulomb excitation of a 56Fe nucleus was measured with the highly segmented MARS prototype positioned at 135 degree. The energy resolution has been improved by a factor of 3 as compared to standard HPGe detectors due to very precise Doppler correction based on knowledge of the gamma-ray track.