First Measurement of Pure Electron Shakeoff in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>Decay of Trapped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:none /><mml:mo>+</mml:mo><mml:mprescripts /><mml:none /><mml:mn>6</mml:mn></mml:mmultiscripts></mml:math>Ions

Couratin, C.; Velten, Ph.; Fléchard, X.; Liénard, E.; Ban, G.; Cassimi, A.; Delahaye, P.; Durand, Dominique; Hennecart, D.; Mauger, F.; Méry, A.; Naviliat‐Cuncic, O.; Patyk, Z.; Rodriguez, D. Rodriguez; Siegień-Iwaniuk, K.; Thomas, J. C.

doi:10.1103/physrevlett.108.243201

Cited by 54 publications

(38 citation statements)

References 20 publications

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“…In a second experiment performed with the improved setup of Fig. 3, the shake-off probability was experimentally measured and was found to be in very good agreement with the theoretical value [12]. The characteristics of the ion cloud inside the trap have a strong influence on the ToF spectrum.…”

Section: Measurements In the Decay Of 6 Hesupporting

confidence: 54%

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Precision measurements in nuclear ‐decay with LPCTrap

et al. 2013

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The experimental achievements and the current program with the LPCTrap device installed at the LIRAT beam line of the SPIRAL1-GANIL facility are presented. The device is dedicated to the study of the weak interaction at low energy by means of precise measurements of the β−ν angular correlation parameter. Technical aspects as well as the main results are reviewed. The future program with new available beams is briefly discussed. The β−ν angular correlationThe structure of the weak interaction remains an important topic in the area of fundamental interaction physics. In particular, at low energies, there are nowadays ambitious experimental programs to search for "exotic" currents beyond the V-A theory [1,2]. Such studies have recently made significant progress with the advent of improved trapping techniques [3,4]. These sophisticated setups allow the production of β-decay sources almost at rest and confined in small volumes that can be surrounded by suitable detectors [5,6]. We describe here the achievements made with the LPCTrap setup installed at GANIL 1 . The experimental program is dedicated to precision measurements of the β−ν angular correlation parameter.From a theoretical point of view, the generalization of Fermi's theory leads to consideration of five different Lorentz invariant contributions in the transition amplitude describing nuclear beta decay, which are referred to as scalar (S), vector (V), tensor (T), axial-vector (A) and pseudoscalar (P). The search for S and T exotic contributions can be performed through a precise measurement of the β−ν angular correlation parameter, a βν . For allowed transitions and nonoriented nuclei, this parameter can be directly inferred from an events distribution linked to the angular correlation between the leptons [7]. GANIL: Grand Accélérateur National d'Ions LourdsSince neutrinos are difficult to detect, a sensitive observable for a β−ν angular correlation measurement is a kinematic parameter of the recoiling daughter nucleus. If the β particles and the recoil ions are detected in coincidence and the relative time of flight (ToF) is measured between the two particles, the expected distribution of events in the electron energy and recoil ion time of flight, t, is for all solid angles detected:where T e , E e and r(t) denote the kinetic and total energies of the β particle and the recoil ion momentum, respectively. Q is the energy available in the transition, K is a constant and F(± Z, E e ) is the Fermi function (β − and β + decays). The parameter a βν and the Fierz interference term b depend on the coupling constants, C i and C i (i = S, V, T, A), associated to the different contributions [7]:

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Section: Measurements In the Decay Of 6 Hesupporting

confidence: 54%

“…3, right panel) [12]. A major improvement in the efficiency was reached resulting from several modifications of the setup.…”

Section: Sourcementioning

confidence: 95%

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Precision measurements in nuclear ‐decay with LPCTrap

et al. 2013

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“…Since this measurement records the position and energy of the β particle and the position and time-of-flight of the 6 Li recoils detected in coincidence with the β particles, the kinematics is over determined allowing the construction of the neutrino invariant mass [75] and enabling the control of background and instrumental effects. Three data production runs have been completed with this setup including a measurement of the shake-off probability of the singly bound electron in the recoiling ions following β decay [76]. A relative statistical error of 2% has been obtained from the analysis of the first run [74] with a systematic error of comparable size.…”

Section: The βν Angular Correlation Amentioning

confidence: 99%

Prospects for precision measurements in nuclear decay in the LHC era

2013

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Precision measurements in nuclear β decay offer a sensitive window to search for new physics beyond the standard electroweak model. Searches for new physics are also a strong motivation for experiments carried out at the high energy frontier. It is instructive to confront results from the low energy and the high energy frontiers in order to look for possible complementarities. This paper reviews the constraints on new physics obtained from nuclear and neutron decays and compares them to those from other semi-leptonic processes and from the LHC. The sensitivity requirements of new precision experiments in β decay, to impact the search for new physics at the light of current and projected LHC results, are updated. Experimental developments in nuclear and neutron β decay are discussed with emphasis on their projected goals to improve the limits on exotic weak couplings.

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“…We present similar results for the case of a He(1s2s 3 S) initial state in Table 2. [9] for the corresponding one-electron 6 He + case. However, the comparison with experiment in Table 1 shows that the calculated recoil contributions are nearly an order of magnitude smaller than the measured values from the experiment of Carlson et al [5].…”

Section: Resultsmentioning

confidence: 99%