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Precision Measurement of the ß Asymmetry in Spin-Polarized
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.
Afiliação
  • Fenker B; Cyclotron Institute, Texas A&M University, 3366 TAMU, College Station, Texas 77843-3366, USA.
  • Gorelov A; Department of Physics and Astronomy, Texas A&M University, 4242 TAMU, College Station, Texas 77843-4242, USA.
  • Melconian D; TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  • Behr JA; Cyclotron Institute, Texas A&M University, 3366 TAMU, College Station, Texas 77843-3366, USA.
  • Anholm M; Department of Physics and Astronomy, Texas A&M University, 4242 TAMU, College Station, Texas 77843-4242, USA.
  • Ashery D; TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  • Behling RS; TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  • Cohen I; Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
  • Craiciu I; School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel.
  • Gwinner G; Cyclotron Institute, Texas A&M University, 3366 TAMU, College Station, Texas 77843-3366, USA.
  • McNeil J; Department of Chemistry, Texas A&M University, 3012 TAMU, College Station, Texas 77843-3012, USA.
  • Mehlman M; School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel.
  • Olchanski K; TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  • Shidling PD; Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
  • Smale S; TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  • Warner CL; Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
Phys Rev Lett ; 120(6): 062502, 2018 Feb 09.
Article em En | MEDLINE | ID: mdl-29481259
ABSTRACT
Using Triumf's neutral atom trap, Trinat, for nuclear ß decay, we have measured the ß asymmetry with respect to the initial nuclear spin in ^{37}K to be A_{ß}=-0.5707(13)_{syst}(13)_{stat}(5)_{pol}, a 0.3% measurement. This is the best relative accuracy of any ß-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 ß-decay measurements, and improve the value of V_{ud} measured in this mirror nucleus by a factor of 4.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article
Texto completo
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article