Determination of the electron-antineutrino correlation coefficient a in neutron β-decay by measurement of the integrated proton spectrum

Dawber, P. G.; Byrne, J.; Grinten, M. G. D. van der; Habeck, Chris; Shaikh, F.; Spain, J. A.; Baker, C.A.; Green, K; Scott, Roger; Zimmer, O.

doi:10.1016/s0168-9002(99)01034-7

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…Two experiment efforts are underway that plan to push the relative uncertainty to the 0.5% level or better. In the aSPECT experiment [126], one again measures a proton energy spectrum as a function of a potential, similar to the idea used for the proton trap experiment. One increases the statistical power by completely separating the source part and the spectroscopy part of the apparatus.…”

Section: Electron-antineutrino Correlation Amentioning

confidence: 99%

Neutron beta decay

Nico

2009

J. Phys. G: Nucl. Part. Phys.

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Studies of low-energy processes, such as neutron beta-decay, contribute important information regarding different aspects of physics including nuclear and particle physics and cosmology. The information from these systems is often complementary to that obtained from high-energy sources. Neutron decay is the most basic charged-current weak interaction in baryons. Precise measurement of the parameters characterizing it can be used to study the standard model as well set limits on possible extensions to it. This paper gives an overview of some of the basic features of neutron beta decay and summarizes the status of some recent developments.

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Section: Electron-antineutrino Correlation Amentioning

confidence: 99%

Neutron beta decay

Nico

2009

J. Phys. G: Nucl. Part. Phys.

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“…The final experiments were performed during two cycles in 1998 and a preliminary account of the results including many of the technical details has been published [14]. For this work the counting rates were raised from about 4 counts s −1 to about 20 counts s −1 .…”

Section: Final Resultsmentioning

confidence: 99%

“…The choice of a multi-electrode assembly enables traps of different lengths to be used thereby eliminating end effects. The neutron beam is collimated by a 16 mm diameter aperture fixed at the entrance to the cryostat in combination with a 20 mm aperture located 5 m upstream [14].…”

Section: Measurement Of the Integral Proton Spectrum Using An Ion Trapmentioning

confidence: 99%

“…In the preliminary experiments with a trapping time of 10 ms and a total count rate of 4 s −1 the maximum correction was about 2%. However, when the counting rate is raised by an order of magnitude to gain the necessary statistics, the deadtime effect is observed as a saturation of the counting rate for long trapping times [14]. Thus the trapping time must be reduced in proportion with a corresponding dramatic increase in background.…”

Section: Data Collectionmentioning

confidence: 99%

“…The results were compared with the theoretical spectrum g(E) [11] to which, in addition to the removal of an error in sign noted in [14], a number of corrections were applied. The first of these was the Coulomb correction which is contained in the three functions f 0 , f 1 and f 2 defined in the Nachtmann formula [11].…”

Section: The Theoretical Spectrummentioning

confidence: 99%

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Determination of the electron$ndash$antineutrino angular correlation coefficient a0 and the parameter |$\lambda$| $equal$ |GA/GV | in free neutron $\beta$-decay from measurements of the integrated energy spectrum of recoil protons stored in an ion trap

Byrne

Dawber

Grinten

et al. 2002

J. Phys. G: Nucl. Part. Phys.

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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.

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Nuclear Data Sheets for A = 1

Singh

2005

Nuclear Data Sheets

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Determination of the electron-antineutrino correlation coefficient a in neutron β-decay by measurement of the integrated proton spectrum

Cited by 5 publications

References 9 publications

Neutron beta decay

Neutron beta decay

Determination of the electron$ndash$antineutrino angular correlation coefficient a0 and the parameter |$\lambda$| $equal$ |GA/GV | in free neutron $\beta$-decay from measurements of the integrated energy spectrum of recoil protons stored in an ion trap

Nuclear Data Sheets for A = 1

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