Measurement of the neutrino asymmetry in the β decay of laser-cooled, polarized 37K

D. Melconian; J. A. Behr; D. Ashery; O. Aviv; P. G. Bricault; M. Dombsky; S. Fostner; A. Gorelov; S. Gu; V. Hanemaayer; K. P. Jackson; M. R. Pearson; I. Vollrath

doi:10.1016/j.physletb.2007.04.047

Measurement of the neutrino asymmetry in the β decay of laser-cooled, polarized ³⁷K

D. Melconian^*, J. A. Behr, D. Ashery, O. Aviv, P. G. Bricault, M. Dombsky, S. Fostner, A. Gorelov, S. Gu, V. Hanemaayer, K. P. Jackson, M. R. Pearson, I. Vollrath

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

A measurement of the neutrino asymmetry is presented which represents the first search for new physics using polarized radioactive atoms initially cooled and confined in a magneto-optical trap. Optical pumping and photoionization techniques are used to generate and measure, in situ, a highly spin-polarized (96.5 (0.8) %) sample of the short-lived β⁺-emitter ³⁷K. The angular distribution of neutrinos from this polarized decay, inferred from the daughter recoil asymmetry, is used to search for a hypothetical V + A current in the weak interaction. We find the ν asymmetry parameter to be B_ν = - 0.755 ± 0.020 (stat) ± 0.013 (syst), in agreement with the standard model's purely V - A interaction.

Original language	English
Pages (from-to)	370-375
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	649
Issue number	5-6
DOIs	https://doi.org/10.1016/j.physletb.2007.04.047
State	Published - 14 Jun 2007

Funding

Funders	Funder number
CIPI
TRIUMF
Natural Sciences and Engineering Research Council of Canada
National Rehabilitation Center
Israel Science Foundation

Keywords

Atom trapping
Neutrino asymmetry
Nuclear β decay
Optical pumping
Parity violation
Right-handed currents

Access to Document

10.1016/j.physletb.2007.04.047

Cite this

Melconian, D., Behr, J. A., Ashery, D., Aviv, O., Bricault, P. G., Dombsky, M., Fostner, S., Gorelov, A., Gu, S., Hanemaayer, V., Jackson, K. P., Pearson, M. R., & Vollrath, I. (2007). Measurement of the neutrino asymmetry in the β decay of laser-cooled, polarized ³⁷K. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 649(5-6), 370-375. https://doi.org/10.1016/j.physletb.2007.04.047

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title = "Measurement of the neutrino asymmetry in the β decay of laser-cooled, polarized 37K",

abstract = "A measurement of the neutrino asymmetry is presented which represents the first search for new physics using polarized radioactive atoms initially cooled and confined in a magneto-optical trap. Optical pumping and photoionization techniques are used to generate and measure, in situ, a highly spin-polarized (96.5 (0.8) %) sample of the short-lived β+-emitter 37K. The angular distribution of neutrinos from this polarized decay, inferred from the daughter recoil asymmetry, is used to search for a hypothetical V + A current in the weak interaction. We find the ν asymmetry parameter to be Bν = - 0.755 ± 0.020 (stat) ± 0.013 (syst), in agreement with the standard model's purely V - A interaction.",

keywords = "Atom trapping, Neutrino asymmetry, Nuclear β decay, Optical pumping, Parity violation, Right-handed currents",

author = "D. Melconian and Behr, {J. A.} and D. Ashery and O. Aviv and Bricault, {P. G.} and M. Dombsky and S. Fostner and A. Gorelov and S. Gu and V. Hanemaayer and Jackson, {K. P.} and Pearson, {M. R.} and I. Vollrath",

note = "Funding Information: We acknowledge the support staff of TRIUMF and ISAC, conversations with J. Deutsch and N. Severijns, and computing resources from WestGrid. This work is supported by NRC through TRIUMF, NSERC, CIPI and the Israel Science Foundation. ",

year = "2007",

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doi = "10.1016/j.physletb.2007.04.047",

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Melconian, D, Behr, JA, Ashery, D, Aviv, O, Bricault, PG, Dombsky, M, Fostner, S, Gorelov, A, Gu, S, Hanemaayer, V, Jackson, KP, Pearson, MR & Vollrath, I 2007, 'Measurement of the neutrino asymmetry in the β decay of laser-cooled, polarized ³⁷K', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 649, no. 5-6, pp. 370-375. https://doi.org/10.1016/j.physletb.2007.04.047

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T1 - Measurement of the neutrino asymmetry in the β decay of laser-cooled, polarized 37K

AU - Melconian, D.

AU - Behr, J. A.

AU - Ashery, D.

AU - Aviv, O.

AU - Bricault, P. G.

AU - Dombsky, M.

AU - Fostner, S.

AU - Gorelov, A.

AU - Gu, S.

AU - Hanemaayer, V.

AU - Jackson, K. P.

AU - Pearson, M. R.

AU - Vollrath, I.

N1 - Funding Information: We acknowledge the support staff of TRIUMF and ISAC, conversations with J. Deutsch and N. Severijns, and computing resources from WestGrid. This work is supported by NRC through TRIUMF, NSERC, CIPI and the Israel Science Foundation.

PY - 2007/6/14

Y1 - 2007/6/14

N2 - A measurement of the neutrino asymmetry is presented which represents the first search for new physics using polarized radioactive atoms initially cooled and confined in a magneto-optical trap. Optical pumping and photoionization techniques are used to generate and measure, in situ, a highly spin-polarized (96.5 (0.8) %) sample of the short-lived β+-emitter 37K. The angular distribution of neutrinos from this polarized decay, inferred from the daughter recoil asymmetry, is used to search for a hypothetical V + A current in the weak interaction. We find the ν asymmetry parameter to be Bν = - 0.755 ± 0.020 (stat) ± 0.013 (syst), in agreement with the standard model's purely V - A interaction.

AB - A measurement of the neutrino asymmetry is presented which represents the first search for new physics using polarized radioactive atoms initially cooled and confined in a magneto-optical trap. Optical pumping and photoionization techniques are used to generate and measure, in situ, a highly spin-polarized (96.5 (0.8) %) sample of the short-lived β+-emitter 37K. The angular distribution of neutrinos from this polarized decay, inferred from the daughter recoil asymmetry, is used to search for a hypothetical V + A current in the weak interaction. We find the ν asymmetry parameter to be Bν = - 0.755 ± 0.020 (stat) ± 0.013 (syst), in agreement with the standard model's purely V - A interaction.

KW - Atom trapping

KW - Neutrino asymmetry

KW - Nuclear β decay

KW - Optical pumping

KW - Parity violation

KW - Right-handed currents

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