Symmetry violations in nuclear and neutron<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>decay

Vos, Kimberley; Wilschut, Hans; Timmermans, Robertus

doi:10.1103/revmodphys.87.1483

Cited by 64 publications

(75 citation statements)

References 169 publications

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“…[7][8][9][10]). It is possible to search for these exotic currents via careful study of the kinematics and correlations following β-decay and making comparisons to SM predictions.…”

Section: Introductionmentioning

confidence: 99%

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

et al. 2016

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Abstract. The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the β + decay of 35 Ar has been collected with the WITCH retardation spectrometer located at CERN-ISOLDE. Over 25 million recoil-ion events were recorded on a large-area multichannel plate (MCP) detector with a time-stamp precision of 2 ns and position resolution of 0.1 mm due to the newly upgraded data acquisition based on the LPC Caen FASTER protocol. The number of recoil ions was measured for more than 15 different settings of the retardation potential, complemented by dedicated background and half-life measurements. Previously unidentified systematic effects, including an energy-dependent efficiency of the main MCP and a radiation-induced time-dependent background, have been identified and incorporated into the analysis. However, further understanding and treatment of the radiation-induced background requires additional dedicated measurements and remains the current limiting factor in extracting a betaneutrino angular correlation coefficient for 35 Ar decay using the WITCH spectrometer.

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“…[7][8][9][10]). It is possible to search for these exotic currents via careful study of the kinematics and correlations following β-decay and making comparisons to SM predictions.…”

Section: Introductionmentioning

confidence: 99%

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

et al. 2016

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“…(This is not the case for β decay of high-energy (γ 1) radioactive-particles.) Current limits on χ components are at least below 10 −3 and in the absence of fine tuning at the level of 10 −6 [9]. The only components not measured until now are χ l0 i .…”

Section: Theoretical Frameworkmentioning

confidence: 86%

“…Our result and the results from other experiments, in particular those of forbidden transitions [4], restrict the values of χ μν in various ways, depending on the extent of fine tuning. (For an overview see [6].) The only unknown value without any limit is χ l0 i .…”

Section: Discussionmentioning

confidence: 99%

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Test of rotational invariance in β decay

Wilschut¹,

Sytema²

2016

Hyperfine Interact

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“…Relatively few searches have been conducted [5]. The study of β-decay can give a unique contribution [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Test of Lorentz invariance inβdecay of polarizedNa20

Sytema¹,

Berg

Böll

et al. 2016

Phys. Rev. C

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Background: Lorentz invariance is key in our understanding of nature, yet relatively few experiments have tested Lorentz invariance in weak interactions.Purpose: Obtaining limits on Lorentz-invariance violation in weak interactions, in particular rotational invariance in β-decay. Method:We search for a dependence of the lifetime of 20 Na nuclei on the nuclear spin direction.Such directional dependence would be evidence for Lorentz-invariance violation in weak interactions. A difference in lifetime between nuclei that are polarized in the east and west direction is searched for. This difference is maximally sensitive to the rotation of the Earth, while the sidereal dependence is free from most systematic errors.Results: The experiment sets a limit of 2 × 10 −4 at 90 % C.L. on the amplitude of the sidereal variation of the relative lifetime differences, an improvement by a factor 15 compared to an earlier result.Conclusions: No significant violation of Lorentz invariance is found. The result sets limits on parameters of theories describing Lorentz-invariance violation.

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Symmetry violations in nuclear and neutronβdecay

Cited by 64 publications

References 169 publications

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

Test of rotational invariance in β decay

Test of Lorentz invariance inβdecay of polarizedNa20

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