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

35 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

Access to Document

10.1103/PhysRevLett.120.062502

Cite this

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

@article{ae389737ade3479d92b5b02c87846d9a,

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.}",

note = "Publisher Copyright: {\textcopyright} 2018 American Physical Society.",

year = "2018",

month = feb,

day = "8",

doi = "10.1103/PhysRevLett.120.062502",

language = "אנגלית",

volume = "120",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "6",

}

TY - JOUR

T1 - Precision Measurement of the β Asymmetry in Spin-Polarized K 37 Decay

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

Y1 - 2018/2/8

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.

UR - http://www.scopus.com/inward/record.url?scp=85041862851&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.120.062502

DO - 10.1103/PhysRevLett.120.062502

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85041862851

SN - 0031-9007

VL - 120

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 062502

ER -

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this