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The Time Projection Chamber (TPC) has been recognized as a doubtlessly powerful detector for the search of WIMPs by measuring the instructions of nuclear recoils, by which essentially the most convincing signature of WIMPs, attributable to the Earth’s motion across the Galaxy, seems. We report on the first outcomes of a performance research of the neutron publicity of our prototype micro TPC with Ar-C2H6 (90:10) and CF4 gasoline at 150 Torr. These particles could be detected straight by measuring the nuclear recoils produced by their elastic scattering off nuclei in detectors. Essentially the most convincing signature of WIMPs appears within the directions of nuclear recoils. For the reason that power deposits of WIMPs to nuclei are only a few tens of keV and the range of nuclei is restricted, ItagPro the micro-TPC needs to be operated at low pressures. In the present work, with a view to examine the response of the micro-TPC to nuclear recoils at low pressures as a first step, we irradiated a a hundred and fifty Torr Ar-C2H6 (90:10 mixture) gasoline (one among the standard gases for TPCs) and CF4 with neutrons from 252Cf. The track lengths and deposited energies of Ar, C, and F recoils have been investigated.

The prototype micro-TPC used in this measurements is proven in Fig.1. PIC and GEM. The small print of this GEM are described in Refs. The pre-amplified signals are summed and digitized by 100 MHz 8bit flash ADCs so as to determine the deposited vitality and affordable item tracker the monitor route as the waveforms hold the Bragg curve shapes. Ar-C2H6 (90:10) or CF4 gasoline to a stress of 150 Torr and sealed at some point of the measurement. For measuring the gas achieve and the energy calibration, the gas was irradiated with 109Cd 22 keV and 133Ba 31.0 keV X-rays through a 1mm thick aluminum window close to the sensitive quantity. We irradiated the micro-TPC with neutrons from a 1 MBq 252Cf source on the top of the vessel. 2 cm3 plastic scintillator iTagPro website were used because the event set off. PIC and GEM with a moderately low gas achieve (beneath 1000) so as to observe the nuclear recoils.

PIC and changed the voltage between the GEM electrodes. Below a gasoline achieve of about 2000, our system was not in a position to measure the 109Cd 22 keV x-ray accurately due to a mismatch of the dynamic range of the ASD chips and the flash ADC; due to this fact, the deposited energy in low-achieve operations was extrapolated from the calibrations with the excessive fuel gain operations. We evaluated the observe length as a perform of the measured electron equivalent energy in the following manner. E/dx????????????????dE/dx threshold can be indicated for a comparison. Under operation with a fuel acquire of 3000, electron recoils and proton (of C2H6) recoils were clearly observed in keeping with their dE/dx????????????????dE/dx. Then again, in the operation of the gasoline acquire of 900, the C and best item finder gadget Ar recoils and a few proton recoils were observed due to the excessive dE/dx????????????????dE/dx threshold. The measured track length of events when the GEM voltage was set to 215 V (gasoline gain of 4500) and iTagPro ninety five V (gasoline achieve of 800) are shown in Fig.4. We successfully confirmed the nuclear recoils in one hundred fifty Torr of Ar-C2H6 (90:10) and CF4 gases based on their dE/dx????????????????dE/dx by altering the detector threshold. When it comes to dE/dx????????????????dE/dx, iTagPro reviews the tracks in the micro TPC were a lot simpler to detect for C, F or Ar recoils. Ultimately, our concern is the recoil course of such nuclei beneath one hundred keV to permit us to observe the indicators of WIMPs. In order to obtain longer tracks and clear Bragg curves, higher fuel acquire operations at lower pressures with low-power neutron beams are wanted. The measurement of the incident neutron vitality with Time-Of-Flight may also be useful to study the quenching factor of nuclear ionization in the micro-TPC.

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