$β$-nuclear-recoil correlation from $^6$He decay in a laser trap

Müller, P.; Bagdasarova, Y.; Hong, R.; Leredde, A.; Bailey, K. G.; Fléchard, X.; García, A.; Graner, B.; Knecht, A.; Naviliat-Cuncic, O.; O'Connor, T. P.; Sternberg, M. G.; Storm, D. W.; Swanson, H. E.; Wauters, F.; Zumwalt, D. W.

doi:10.48550/arxiv.2206.00742

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…The last term appears at second order in the multipole expansion. Both corrections are still below the experimental sensitivity [120].…”

Section: (A3)mentioning

confidence: 79%

Ab initio calculation of the $β$ decay spectrum of $^6$He

King¹,

Baroni²,

Cirigliano³

et al. 2022

Preprint

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We calculate the β spectrum in the decay of 6 He using Quantum Monte Carlo methods with nuclear interactions derived from chiral Effective Field Theory and consistent weak vector and axial currents. We work at second order in the multipole expansion, retaining terms suppressed by O(q 2 /m 2 π ), where q denotes low-energy scales such as the reaction's Q-value or the electron energy, and m π the pion mass. We go beyond the impulse approximation by including the effects of two-body vector and axial currents. We estimate the theoretical error on the spectrum by using four potential models in the Norfolk family of local two-and three-nucleon interactions, which have different cut-off, fit two-nucleon data up to different energies and use different observables to determine the couplings in the three-body force. We find the theoretical uncertainty on the β spectrum, normalized by the total rate, to be well below the permille level, and to receive contributions of comparable size from first and second order corrections in the multipole expansion. We consider corrections to the β decay spectrum induced by beyond-the-Standard Model charged-current interactions in the Standard Model Effective Field Theory, with and without sterile neutrinos, and discuss the sensitivity of the next generation of experiments to these interactions.

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“…The last term appears at second order in the multipole expansion. Both corrections are still below the experimental sensitivity [120].…”

Section: (A3)mentioning

confidence: 79%

Ab initio calculation of the $β$ decay spectrum of $^6$He

King¹,

Baroni²,

Cirigliano³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The simplicity of the decay has regained considerable attention in the past decades as a sensitive window to probe the electroweak standard model in the sector involving the lightest quarks. Experiments using trapped 6 He + ions [3] or atoms [4] have been performed to address the β-neutrino angular correlation and ancillary measurements have been carried out to study atomic effects following β decay [5,6]. New techniques have been proposed to determine the Fierz interference term from the β-energy spectrum [7][8][9] and selected observables of the transition have been the object of detailed theoretical studies to assess the sensitivity of future experiments to new physics [10,11].…”

Section: Introductionmentioning

confidence: 99%

High-precision measurement of the He6 half-life

Kanafani¹,

Fléchard²,

Naviliat‐Cuncic³

et al. 2022

Phys. Rev. C

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The half-life of 6 He has been measured using a low-energy radioactive beam implanted in an YAlO 3 Ce-doped inorganic scintillator and recording decay events in a 4π geometry. Events were time-stamped with a digital data acquisition system enabling a reliable control of dead-time effects and detector gain variations. The result, T 1/2 = (807.25 ± 0.16 stat ± 0.11 sys ) ms, provides the most precise value obtained so far and is consistent with the only previous measurement having a precision smaller than 0.1%. This resolves the long-standing discrepancy previously observed between two sets of measurements.

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$β$-nuclear-recoil correlation from $^6$He decay in a laser trap

Cited by 2 publications

References 27 publications

Ab initio calculation of the $β$ decay spectrum of $^6$He

Ab initio calculation of the $β$ decay spectrum of $^6$He

High-precision measurement of the He6 half-life

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