For example when fission fragments coming out of HI induced fission reaction hits a solid state detector it produces a dense cloud of electron -hole pair, the electric field generated by given voltage to the detector cannot penetrate the cloud until the cloud is dispersed by the diffusion. This leads to the so called plasma delay in the detector. Over biasing the detector helps in reducing vary important which can only be done by cooling the detector for sub zero temperature. The higher mobility of charge carriers improves the timing characteristics of detector. 2 D nuclear includes, nuclear collisions, fluctuations in the number of charge carriers etc. .
D noise includes electronic noise contribution of the detector and pre amplifier.
2 D leakage contributes to the detector leakage current and D capacitance contributes to the detector capacitance. D leakage is due to the thermal generation of electron-hole pairs in the detector in the depletion region which is temperature dependent, this can be reduced by cooling the detector. The testing of the cooled detector has been done this year and the details of the testing and results are given below. The testing of the components with radiation source and preliminary beam test were done. The proton and a multiplicities, along with g-g coincidence spectra were recorded event by event.