A helium-filled time projection chamber for a neutron lifetime measurement

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Abstract

The design and performance of a4He-filled TPC, constructed to measure the neutron half-life, are described. Preliminary results obtained with radioactive sources and with a chopped neutron beam are discussed.

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    Rep. Prog. Phys.

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There are more references available in the full text version of this article.

Cited by (10)

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    Citation Excerpt :

    However, there is a 1% discrepancy, i.e., 8.4±2.2 s, between two methods: counting surviving ultra-cold neutrons after storing (879.6±0.8 s [2–6]), and counting trapped protons from the neutron β-decay (888.0±2.1 s [7,8]). The experiment proposed in this paper employs an electron-counting method, based on experiments at the ILL (Grenoble/France) [9–11] and at J-PARC (Tokai/Japan) [12–16]. Pulsed cold neutron beams pass through a time projection chamber (TPC) filled with a gas mixture of 4He:CO2:3He=85 kPa:15 kPa:100 mPa, which allows to detect not only electrons from the neutron β-decay but also to measure the neutron flux by admixture of 3He since according to the 3He(n,p)3H reaction a neutron captured in 3He emits a 573 keV proton and a 191 keV triton.

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