Precision Measurement of the β Asymmetry in Spin-Polarized K 37 Decay

B. Fenker; A. Gorelov; D. Melconian; J. A. Behr; M. Anholm; D. Ashery; R. S. Behling; I. Cohen; I. Craiciu; G. Gwinner; J. McNeil; M. Mehlman; K. Olchanski; P. D. Shidling; S. Smale; C. L. Warner

doi:10.1103/PhysRevLett.120.062502

Precision Measurement of the β Asymmetry in Spin-Polarized K 37 Decay

B. Fenker, A. Gorelov, D. Melconian, J. A. Behr, M. Anholm, D. Ashery, R. S. Behling, I. Cohen, I. Craiciu, G. Gwinner, J. McNeil, M. Mehlman, K. Olchanski, P. D. Shidling, S. Smale, C. L. Warner

School of Physics and Astronomy

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

37 Scopus citations

Abstract

Using Triumf's neutral atom trap, Trinat, for nuclear β decay, we have measured the β asymmetry with respect to the initial nuclear spin in K37 to be Aβ=-0.5707(13)syst(13)stat(5)pol, a 0.3% measurement. This is the best relative accuracy of any β-asymmetry measurement in a nucleus or the neutron, and is in agreement with the standard model prediction -0.5706(7). We compare constraints on physics beyond the standard model with other β-decay measurements, and improve the value of Vud measured in this mirror nucleus by a factor of 4.

Original language	English
Article number	062502
Journal	Physical Review Letters
Volume	120
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.120.062502
State	Published - 8 Feb 2018

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Fenker, B., Gorelov, A., Melconian, D., Behr, J. A., Anholm, M., Ashery, D., Behling, R. S., Cohen, I., Craiciu, I., Gwinner, G., McNeil, J., Mehlman, M., Olchanski, K., Shidling, P. D., Smale, S., & Warner, C. L. (2018). Precision Measurement of the β Asymmetry in Spin-Polarized K 37 Decay. Physical Review Letters, 120(6), Article 062502. https://doi.org/10.1103/PhysRevLett.120.062502

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title = "Precision Measurement of the β Asymmetry in Spin-Polarized K 37 Decay",

abstract = "Using Triumf's neutral atom trap, Trinat, for nuclear β decay, we have measured the β asymmetry with respect to the initial nuclear spin in K37 to be Aβ=-0.5707(13)syst(13)stat(5)pol, a 0.3\% measurement. This is the best relative accuracy of any β-asymmetry measurement in a nucleus or the neutron, and is in agreement with the standard model prediction -0.5706(7). We compare constraints on physics beyond the standard model with other β-decay measurements, and improve the value of Vud measured in this mirror nucleus by a factor of 4.",

author = "B. Fenker and A. Gorelov and D. Melconian and Behr, \{J. A.\} and M. Anholm and D. Ashery and Behling, \{R. S.\} and I. Cohen and I. Craiciu and G. Gwinner and J. McNeil and M. Mehlman and K. Olchanski and Shidling, \{P. D.\} and S. Smale and Warner, \{C. L.\}",

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doi = "10.1103/PhysRevLett.120.062502",

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AU - Fenker, B.

AU - Gorelov, A.

AU - Melconian, D.

AU - Behr, J. A.

AU - Anholm, M.

AU - Ashery, D.

AU - Behling, R. S.

AU - Cohen, I.

AU - Craiciu, I.

AU - Gwinner, G.

AU - McNeil, J.

AU - Mehlman, M.

AU - Olchanski, K.

AU - Shidling, P. D.

AU - Smale, S.

AU - Warner, C. L.

PY - 2018/2/8

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N2 - Using Triumf's neutral atom trap, Trinat, for nuclear β decay, we have measured the β asymmetry with respect to the initial nuclear spin in K37 to be Aβ=-0.5707(13)syst(13)stat(5)pol, a 0.3% measurement. This is the best relative accuracy of any β-asymmetry measurement in a nucleus or the neutron, and is in agreement with the standard model prediction -0.5706(7). We compare constraints on physics beyond the standard model with other β-decay measurements, and improve the value of Vud measured in this mirror nucleus by a factor of 4.

AB - Using Triumf's neutral atom trap, Trinat, for nuclear β decay, we have measured the β asymmetry with respect to the initial nuclear spin in K37 to be Aβ=-0.5707(13)syst(13)stat(5)pol, a 0.3% measurement. This is the best relative accuracy of any β-asymmetry measurement in a nucleus or the neutron, and is in agreement with the standard model prediction -0.5706(7). We compare constraints on physics beyond the standard model with other β-decay measurements, and improve the value of Vud measured in this mirror nucleus by a factor of 4.

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Precision Measurement of the β Asymmetry in Spin-Polarized K 37 Decay

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