Ionization Quenching Factor Measurement of Helium 4

D. Santos; F. Mayet; O. Guillaudin; Th. Lamy; S. Ranchon; A. Trichet; P. Colas; I. Giomataris

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arXiv · 0810.1137

Ionization Quenching Factor Measurement of Helium 4

D. Santos·F. Mayet·O. Guillaudin·Th. Lamy·S. Ranchon·A. Trichet·P. Colas·I. Giomataris

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Abstract

The ionization quenching factor (IQF) is defined as the fraction of energy released by a recoil in a medium through ionization compared with its total kinetic energy. At low energies, in the range of a few keV, the ionization produced in a medium falls rapidly and systematic measurements are needed. We report measurements carried out at such low energies as a function of the pressure in He4 at 350, 700, 1000 and 1300 mbar. In order to produce a nucleus moving with a controlled energy in the detection volume, we have developed an Electron Cyclotron Resonance Ion Source (ECRIS) coupled to an ionization chamber by a differential pumping. The quenching factor of He4 has been measured for the first time down to 1 keV recoil energies. An important deviation with respect to the phenomenological calculations has been found allowing an estimation of the scintillation produced in He4 as a function of pressure. The variation of the IQF as a function of the percentage of isobutane, used as quencher, is also presented.

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D. Santos, F. Mayet, O. Guillaudin, Th. Lamy, S. Ranchon, A. Trichet, P. Colas, I. Giomataris. 2008-10-07. Ionization Quenching Factor Measurement of Helium 4. https://arxiv.org/abs/0810.1137

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