Precision measurements with LPCTrap at GANIL

Liénard, E.; Ban, G.; Couratin, C.; Delahaye, P.; Durand, Dominique; Fabian, X.; Fabre, B.; Fléchard, X.; Finlay, P.; Mauger, F.; Méry, A.; Naviliat‐Cuncic, O.; Pons, B.; Porobic, T.; Qúeḿener, G.; Severijns, N.; Thomas, J. C.; Velten, Ph.

doi:10.1007/s10751-015-1198-9

Cited by 18 publications

(24 citation statements)

References 26 publications

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“…A very interesting byproduct of these measurements with LPCTrap is related to the charge state distributions extracted for the recoiling 6 Li, 19 F and 35 Cl daughter nuclei [181,182,325,326]. For 6 Li the experimental shake-off probability was found to be in perfect agreement with simple quantum mechanical calculations [325].…”

Section: β − ν Correlationmentioning

confidence: 83%

New physics searches in nuclear and neutron β decay

González–Alonso

Naviliat‐Cuncic

Severijns

2019

Progress in Particle and Nuclear Physics

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244

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The status of tests of the standard electroweak model and of searches for new physics in allowed nuclear β decay and neutron decay is reviewed including both theoretical and experimental developments. The sensitivity and complementarity of recent and ongoing experiments are discussed with emphasis on their potential to look for new physics. Measurements are interpreted using a model-independent effective field theory approach enabling to recast the outcome of the analysis in many specific new physics models. Special attention is given to the connection that this approach establishes with high-energy physics. A new global fit of available β-decay data is performed incorporating, for the first time in a consistent way, superallowed 0 + → 0 + transitions, neutron decay and nuclear decays. The constraints on exotic scalar and tensor couplings involving left-or right-handed neutrinos are determined while a constraint on the pseudoscalar coupling from neutron decay data is obtained for the first time as well. The values of the vector and axial-vector couplings, which are associated within the standard model to V ud and g A respectively, are also updated. The ratio between the axial and vector couplings obtained from the fit under standard model assumptions is C A /C V = −1.27510(66). The relevance of the various experimental inputs and error sources is critically discussed and the impact of ongoing measurements is studied. The complementarity of the obtained bounds with other low-and high-energy probes is presented including ongoing searches at the Large Hadron Collider.

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Section: β − ν Correlationmentioning

confidence: 83%

New physics searches in nuclear and neutron β decay

González–Alonso

Naviliat‐Cuncic

Severijns

2019

Progress in Particle and Nuclear Physics

Self Cite

244

282

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“…With other experiments such as LPCTrap [17] making great strides in precision a βν measurements, the massive effort and time commitment that would be involved in characterizing and minimizing a radiation-induced background at WITCH, and the strong competition for radioactive beam time at ISOLDE which would be required in order to pursue such studies, the collaboration has decided that the WITCH spectrometer will be repurposed for other fundamental symmetries studies and will no longer be focused on recoil-ion measurements for the extraction of a βν for 35 Ar decay.…”

Section: Discussionmentioning

confidence: 99%

“…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. In recent years atom and ion traps have been adopted in these searches [11][12][13][14][15][16][17][18], particularly for β-ν correlation measurements as they enable the preparation of isotopically pure, well-localized sources which are easily manipulated and have well-understood properties. The conditions present in atom and ion traps reduce the effects of scattering of the β particles and recoil ions, which is a limitation when sources are implanted in materials.…”

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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“…Observing table II, accumulation of 10 6 recoil ion events in the decay of 19 Ne already improves on the state of the art, and reduces the uncertainty in the prediction of A, which is well-motivated considering the discrepancies in other determinations of A, as well as deviations from the conserved-vector-current hypothesis as discussed in [97]. To complement the highly precise determination of V ud from the body of 0 + → 0 + decay data [53], and considering ongoing correlation measurement efforts with nuclear mirror [35,38,[100][101][102][103][104][105], and neutron [63,64,[106][107][108][109] decays, roughly 10 7 detected events are desired, especially in light of the emergence of a significant (4σ) deviation from CKM unitarity obtained in a recent analysis [110].…”

Section: Opportunities With Neon Isotopesmentioning

confidence: 99%

Decay microscope for trapped neon isotopes

et al. 2020

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We review the design, simulation, and tests, of a detection system for measuring the energy distribution of daughter nuclei recoiling from the beta-decay of laser trapped neon isotopes. This distribution is sensitive to several new physics effects in the weak sector. Our 'decay microscope' relies on imaging the velocity distribution of high energy recoil ions in coincidence with electrons shaken-off in the decay. We demonstrate by way of Monte-Carlo simulation, that the nuclear microscope increases the statistical sensitivity of kinematic measurements to the underlying energy distribution, and limits the main systematic bias caused by discrepancy in the trap position along the detection axis.

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Precision measurements with LPCTrap at GANIL

Cited by 18 publications

References 26 publications

New physics searches in nuclear and neutron β decay

New physics searches in nuclear and neutron β decay

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

Decay microscope for trapped neon isotopes

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