Recent investigation of the G-parity irregular weak nucleon current in β decays of spin aligned 12B and 12N

K. Minamisono, K. Matsuta, T. Minamisono, T. Sumikama, T. Nagatomo, M. Ogura, T. Iwakoshi, T. Yamaguchi, M. Fukuda, M. Mihara, K. Koshigir, M. Morita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The G-parity irregular induced tensor form factor in the weak nucleon axial vector current has been precisely determined by measuring the alignment correlation terms in the β-ray angular distributions of the purely spin aligned mirror pair 12B and 12N. The coefficient of the induced tensor term was determined to be 2M fT/fA = -0.21 ± 0.09 (stat.) ± 0.07 (syst.) ± 0.05 (theory) at a 90% confidence level. The previously obtained data in the year 1996 was reanalyzed to be added to the present result. The combined result is 2MfT / fA = -0.15 ± 0.12 ± 0.05 (theory) at a 90% confidence level. The obtained induced tensor coefficient is vanishingly small. In order to derive these numerical values from the experimental data the weak magnetism and axial charge, and also their charge dependence should be known. Theoretical investigation on these quantities is clearly described. Also we set constraints on the Kubodera-Delorme-Rho parameters from the present result together with the results of correlation-type experiments in the mass A = 8 and 20 systems as ζ = - (0.12 ± 0.14) × 10-3 MeV-1 and λ = + (0.30 ± 0.88) × 10-3 in the 1 σ level.

Original languageEnglish
Title of host publicationBeyond the Desert 2002
Subtitle of host publicationAccelerator, Non-Accelerator and Space Approaches in the New Millennium - Proceedings of the 3rd International Conference on Particle Physics Beyond the Standard Model
EditorsH.V. Klapdor-Kleingrothaus
Pages695-700
Number of pages6
Publication statusPublished - 2003 Dec 1
EventBeyond the Desert 2002: Accelerator, Non-Accelerator and Space Approaches in the New Millennium - Proceedings of the 3rd International Conference on Particle Physics Beyond the Standard Model: Accelerator, Non-Accelerator and Space Approaches - Oulu, Finland
Duration: 2002 Jul 22002 Jul 7

Publication series

NameBeyond the Desert 2002: Accelerator, Non-Accelerator and Space APproaches in the New Millenium - Proceedings of the 3rd International Conference on Particle Physics Beyond the Standard Model

Conference

ConferenceBeyond the Desert 2002: Accelerator, Non-Accelerator and Space Approaches in the New Millennium - Proceedings of the 3rd International Conference on Particle Physics Beyond the Standard Model: Accelerator, Non-Accelerator and Space Approaches
CountryFinland
CityOulu
Period02/7/202/7/7

ASJC Scopus subject areas

  • Engineering(all)

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