Author/Authors :
Koike، نويسنده , , T. and Chiga، نويسنده , , N. and Haruyama، نويسنده , , T. and Hosomi، نويسنده , , K. and Ichinohe، نويسنده , , H. and Kasami، نويسنده , , K. and Matsushita، نويسنده , , T. and Mizoguchi، نويسنده , , Y. and Ono، نويسنده , , H. and Shirotori، نويسنده , , K. and Takeuchi، نويسنده , , T. and Tamura، نويسنده , , H. and Yamamoto، نويسنده , , T.O.، نويسنده ,
Abstract :
We have developed a new germanium (Ge) detector unit for hypernuclear γ-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 γ rays using a gate-integrated shaping amplifier (ORTEC 973U). Gain shifts with changing crystal temperature are also confirmed for the Ge detector.
Keywords :
Germanium detector , Hypernucleus , Gamma-ray spectroscopy , Pulse-tube refrigerator
