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

Finlay, P.; Breitenfeldt, M.; Porobic, T.; Wursten, E.; Ban, G.; Beck, M.; Couratin, C.; Fabian, X.; Fléchard, X.; Friedag, P.; Glück, F.; Herlert, A.; Knecht, A.; Козлов, В.; Liénard, E.; Soti, G.; Tandecki, M.; Traykov, E.; Gorp, S. Van; Weinheimer, C.; Zákoucký, D.; Severijns, N.

doi:10.1140/epja/i2016-16206-y

Cited by 8 publications

(9 citation statements)

References 52 publications

(104 reference statements)

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“…The WITCH project [332,333] at ISOLDE was set up to determine the β-ν correlation coefficient from the measured energy spectrum of the recoiling daughter ions from 35 Ar β decay. Initial results were obtained [334][335][336][337] together with important information about the behavior of ion clouds in a Penning trap [338][339][340]. However, radiation-induced background turned out to be a limiting factor.…”

Section: β − ν Correlationmentioning

confidence: 99%

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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242

282

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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: 99%

New physics searches in nuclear and neutron β decay

González–Alonso

Naviliat‐Cuncic

Severijns

2019

Progress in Particle and Nuclear Physics

Self Cite

242

282

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“…An electrostatic a e-mail: alexanderfulst@uni-muenster.de (corresponding author) retarding filter following adiabatic collimation ("MAC-Efilter") nicely fulfills both requirements. Originally invented for photoelectron spectroscopy [1], it was reinvented for βelectron spectroscopy for experiments in search of the neutrino mass [2,3] and applications to ion spectroscopy comprise precision recoil spectroscopy after β-decay [4,5]. The Karlsruhe Tritium Neutrino experiment KATRIN [6,7] is even using a tandem of two MAC-E-filters in series to perform a neutrino mass search with 0.2 eV sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Time-focusing time-of-flight, a new method to turn a MAC-E-filter into a quasi-differential spectrometer

et al. 2020

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Spectrometers based on the magnetic adiabatic collimation followed by an electrostatic filter (MAC-E-filter) principle combine high angular acceptance with an excellent energy resolution. These features make MAC-E-filters very valuable for experiments where the kinetic energy of ions or electrons from rare processes has to be measured with utmost sensitivity and precision. Examples are direct neutrino mass experiments like KATRIN which investigate the energy of electrons in the endpoint region of the tritium $$\beta $$ β -spectrum. However, the MAC-E-filter is a very sharp energy high-pass filter but not a differential spectrometer. To determine a spectral shape of a charged particle source, different electric retarding potentials have to be used sequentially, reducing the statistics. In a previous work we have shown that the advantages of the standard MAC-E-filter can be combined with a measurement of the time-of-flight (TOF), allowing to determine spectral information over a certain energy range with one retarding potential only, with the corresponding gain in statistics. This TOF method requires one to know the start time of the charged particles, which is not always possible. Therefore, we propose a new method which does not require the determination of the start time and which we call “time-focusing time-of-flight” (tfTOF): by applying a time dependent acceleration and deceleration potential at a subsequent MAC-E-filter, an energy dependent post-bunching of the charged particles is achieved.

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“…An electrostatic a e-mail: alexanderfulst@uni-muenster.de retarding filter following adiabatic collimation ("MAC-Efilter") nicely fulfills both requirements. Originally invented for photoelectron spectroscopy [1], it was reinvented for βelectron spectroscopy for experiments in search of the neutrino mass [2,3] and applications to ion spectroscopy comprise precision recoil spectroscopy after β -decay [4,5]. The Karlsruhe Tritium Neutrino experiment KATRIN [6,7] is even using a tandem of two MAC-E-filters in series to perform a neutrino mass search with 0.2 eV/c 2 sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Time-Focusing Time-of-Flight, a new method to turn a MAC-E-filter into a quasi-differential spectrometer

Fulst,

Lokhov,

Fedkevych

et al. 2020

Preprint

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Spectrometers based on the magnetic adiabatic collimation followed by an electrostatic filter (MAC-E-filter) principle combine high angular acceptance with an excellent energy resolution. These features make MAC-E-filters very valuable for experiments where the kinetic energy of ions or electrons from rare processes has to be measured with utmost sensitivity and precision. Examples are direct neutrino mass experiments like KATRIN which investigate the energy of electrons in the endpoint region of the tritium βspectrum. However, the MAC-E-filter is a very sharp energy high-pass filter but not a differential spectrometer. To determine a spectral shape of a charged particle source, different electric retarding potentials have to be used sequentially, reducing the statistics.In a previous work we have shown that the advantages of the standard MAC-E-filter can be combined with a measurement of the time-of-flight (TOF), allowing to determine spectral information over a certain energy range with one retarding potential only, with the corresponding gain in statistics. This TOF method requires to know the start time of the charged particles, which is not always possible. Therefore, we propose a new method which does not require the determination of the start time and which we call "time-focusing Time-of-Flight" (tfTOF): By applying a time dependent acceleration and deceleration potential at a subsequent MAC-E-filter, an energy dependent post-bunching of the charged particles is achieved.

show abstract

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

Cited by 8 publications

References 52 publications

New physics searches in nuclear and neutron β decay

New physics searches in nuclear and neutron β decay

Time-focusing time-of-flight, a new method to turn a MAC-E-filter into a quasi-differential spectrometer

Time-Focusing Time-of-Flight, a new method to turn a MAC-E-filter into a quasi-differential spectrometer

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