Development of a low-temperature germanium detector via mechanical cooling with a compact pulse-tube refrigerator

作者：Koike T^*; Chiga N; Haruyama T; Hosomi K; Ichinohe H; Kasami K; Matsushita T; Mizoguchi Y; Ono H; Shirotori K; Takeuchi T; Tamura H; Yamamoto T O

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2015, 770: 1-7.

DOI：10.1016/j.nima.2014.09.084

• Germanium detector
• Pulse-tube refrigerator
• Gamma-ray spectroscopy
• Hypernucleus

We have developed a new germanium (Ge) detector unit for hypernuclear gamma-ray spectroscopy at J-PARC, which comprises a new Ge detector array Hyperball-J. A compact pulse-tube refrigerator is coupled to a coaxial Ge detector in order to achieve lower crystal temperatures as a means to increase radiation hardness. The obtained crystal temperature is 72 K, while an energy resolution is maintained at (FWHM) 3.1(1) keV for 1.33 MeV gamma rays using a gate-integrated shaping amplifier (ORTEC 973U). Gain shifts with changing crystal temperature are also confirmed for the Ge detector.

• 出版日期2015-1-11