Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Postersession

HK 45.41: Poster

Wednesday, March 16, 2016, 18:30–20:30, S1/05 22-24

Calibration of the proton detector used for the neutron life time experiment τSPECT — •Kim Roß¹, Marcus Beck^1,2, Jan Haack¹, Werner Heil¹, and Jan Karch¹ — ¹Johannes Gutenberg-Universität Mainz — ²Helmholtz-Institut Mainz

In order to measure the lifetime of free neutrons, a decay curve will be measured by detecting the decay products proton and electron. Their energies range up to 750 eV (protons) respectively 780 keV (electrons). The protons are accelerated onto 15 keV, in order to pass the dead layer of the detector and to be distinguishable from electronic noise. For the measurement a silicon drift detector is used which needs to be calibrated. This is achieved with a ¹³³Ba source mounted on three source holders of different materials in a vacuum chamber. Thus not only four of the characteristic lines of the ¹³³Ba source were measured but also the characteristic lines of the three source holders which yield four more calibration lines in the area of the proton energy in the spectrum. We report the implementation and results of the calibration of the silicon drift detector used for the neutron lifetime measurement τSPECT.