Determination of the electron–antineutrino angular correlation coefficient a0 and the parameter |λ| = |GA/GV | in free neutron β-decay from measurements of the integrated energy spectrum of recoil protons stored in an ion trap

Byrne, J, Dawber, P G, Van Der Grinten, Maurits, Habeck, C G, Shaikh, F, Spain, J A, Scott, R D, Baker, C A, Green, K and Zimmer, O (2002) Determination of the electron–antineutrino angular correlation coefficient a0 and the parameter |λ| = |GA/GV | in free neutron β-decay from measurements of the integrated energy spectrum of recoil protons stored in an ion trap. Journal of Physics G: Nuclear and Particle Physics, 28 (6). 1325 - 1349. ISSN 0954-3899

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Abstract

Recoil protons from the β-decay of unpolarized neutrons are stored in a cryogenic ion trap formed by the superposition of an axisymmetric electrostatic field on a coaxial magnetic field, which varies uniformly in space between regions of high (~4.30 T) and low (~0.61 T) homogeneous field. Protons generated in the high field region are adiabatically focused onto a 'mirror' electrode in the low field region. The integrated energy spectrum is determined by counting the number of stored protons as a function of mirror potential. Violation of the exact adiabatic conditions is corrected for by carrying out alternate measurements at trapping times which differ by a factor of 2. The results: a0 = −0.1054 ± 0.0055, |λ| = 1.271 ± 0.018 are in agreement with previous measurements of these quantities.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: EPrints Services
Date Deposited: 06 Feb 2012 20:35
Last Modified: 23 Jul 2012 08:28
URI: http://sro.sussex.ac.uk/id/eprint/26852
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