The GRETINA Spectrometer

2nd Workshop on Germanium Detectors and Technologies

Cromaz, M.^1

Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, CA

94720, United States^1

关键词: Close packed;    Doppler correction;    Energy resolutions;    Fragmentation facilities;    Gamma-ray tracking;    Ge detectors;    Interaction points;    Solid angle;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/606/1/012016/pdf
DOI  :  10.1088/1742-6596/606/1/012016

来源: IOP

【 摘 要 】

The GRETINA spectrometer is a first generation, gamma-ray tracking spectrometer capable of determining the Compton scattering path of gamma-rays incident on the detector volume. This ability allows the Ge detectors to be close packed allowing the detector to be scaled to high efficiencies while maintaining good peak-to-total. GRETINA currently consists of 7 4-detector modules giving approximately 1π solid angle coverage with a calorimetric efficiency of 6.3% and tracked efficiency of 4.7% at 1.3 MeV. The array's sensitivity to the position of the gamma ray's first interaction point enables precision event-by-event Doppler correction which allows one to achieve 1% energy resolution even for sources moving at a large fraction of the speed of light such as those encountered at fragmentation facilities such as NSCL and the future FRIB.