Measurement of the shape factor for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">O</mml:mi><mml:mprescripts /><mml:none /><mml:mn>14</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>

George, Elizabeth; Voytas, P. A.; Severin, Gregory; Knutson, L. D.

doi:10.1103/physrevc.90.065501

Cited by 10 publications

(2 citation statements)

References 22 publications

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“…The average slope of the shape function over the energy range from 1.9 to 4.0 MeV was found to be −0.0290 (8) stat (6) syst . This is consistent with the value of −0.0285 predicted by CVC which uses for the weak magnetism matrix element the value obtained from the experimental M1 decay strength of the 2313 keV γ ray from the analog (first excited) state in 14 N [257,258]. For the 0 + → 0 + pure Fermi decay of 66 Ga, the spectrum was found to be consistent with that of an allowed spectrum, with an average slope of −0.0026 (10) stat (30) syst per MeV [259], in agreement with the expected absence of weak magnetism in pure Fermi transitions.…”

Section: β-Spectrum Shapesupporting

confidence: 91%

New physics searches in nuclear and neutron β decay

González–Alonso

Naviliat‐Cuncic

Severijns

2019

Progress in Particle and Nuclear Physics

240

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-Spectrum Shapesupporting

confidence: 91%

New physics searches in nuclear and neutron β decay

González–Alonso

Naviliat‐Cuncic

Severijns

2019

Progress in Particle and Nuclear Physics

240

282

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“…However, these higher-order nuclear corrections result in a relatively minor change (e.g. compared to small changes in the decay Qvalue) in the overall decay spectrum shape [21,22] and so these nuclear corrections can be safely neglected. Though the Q-value significantly affects the energy spectrum of emitted β-particles, we demonstrate (in Section 2.4) a relatively small sensitivity of our reported results to the choice of β-decay Q-value, which could vary due to mass uncertainties and/or different assumed final states of the decay.…”

Section: Geant4 Simulationsmentioning

confidence: 99%

β -particle energy-summing correction for β -delayed proton emission measurements

Meisel

Santo

Crawford

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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A common approach to studying β-delayed proton emission is to measure the energy of the emitted proton and corresponding nuclear recoil in a double-sided silicon-strip detector (DSSD) after implanting the β-delayed protonemitting (βp) nucleus. However, in order to extract the proton-decay energy, the measured energy must be corrected for the additional energy implanted in the DSSD by the β-particle emitted from the βp nucleus, an effect referred to here as β-summing. We present an approach to determine an accurate correction for β-summing. Our method relies on the determination of the mean implantation depth of the βp nucleus within the DSSD by analyzing the shape of the total (proton + recoil + β) decay energy distribution shape. We validate this approach with other mean implantation depth measurement techniques that take advantage of energy deposition within DSSDs upstream and downstream of the implantation DSSD.

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Excited Nuclear States for N-14 (Nitrogen)

Sukhoruchkin¹,

Soroko²

2016

Supplement to I/25 a-F

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Measurement of the shape factor for theβdecay ofO14

Cited by 10 publications

References 22 publications

New physics searches in nuclear and neutron β decay

New physics searches in nuclear and neutron β decay

β -particle energy-summing correction for β -delayed proton emission measurements

Excited Nuclear States for N-14 (Nitrogen)

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