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The neutron decay retardation spectrometer aSPECT: Electromagnetic design and systematic effects

journal contribution
posted on 2023-06-08, 00:28 authored by F Glück, S Baeßler, J Byrne, Maurits G D Van Der Grinten, F J Hartmann, W Heil, I Konorov, G Petzoldt, Yu Sobolev, O Zimmer
The apparatus described here, aSPECT, will be used for a measurement of the neutrino-electron angular correlation coefficient a in the decay of free neutrons. The idea of the aSPECT spectrometer is to measure the integrated proton energy spectrum very accurately using an energy filter by electrostatic retardation and magnetic adiabatic collimation. The main ideas of the spectrometer are presented, followed by an explanation of the adiabatic transmission function. Details of the superconducting coil and of the electrode system are given, as well as a discussion of the most important systematic effects: magnetic field and electrostatic potential inhomogeneities, deviation from adiabatic motion, scattering in the residual gas, background, Doppler effect, edge effect, and detector efficiency. Using this spectrometer, the parameter a is planned to be measured with an absolute experimental uncertainty of da ˜ 3 . 10-4, from which the axial vector to vector coupling constant ratio ? can be determined with an accuracy of d? ˜ 0.001.

History

Publication status

  • Published

Journal

The European Physical Journal A: Hadrons and Nuclei

ISSN

1434-6001

Publisher

Springer Verlag

Issue

1

Volume

23

Page range

135 - 146

Pages

11.0

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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