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

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

SCI - Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 f_T/f_A = -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 2Mf_T / f_A = -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 language	English
Title of host publication	Beyond the Desert 2002
Subtitle of host publication	Accelerator, Non-Accelerator and Space Approaches in the New Millennium - Proceedings of the 3rd International Conference on Particle Physics Beyond the Standard Model
Editors	H.V. Klapdor-Kleingrothaus
Pages	695-700
Number of pages	6
Publication status	Published - 2003 Dec 1
Event	Beyond 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 2 → 2002 Jul 7

Publication series

Name	Beyond 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

Conference	Beyond 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
Country/Territory	Finland
City	Oulu
Period	02/7/2 → 02/7/7

ASJC Scopus subject areas

Engineering(all)

Cite this

Minamisono, K., Matsuta, K., Minamisono, T., Sumikama, T., Nagatomo, T., Ogura, M., Iwakoshi, T., Yamaguchi, T., Fukuda, M., Mihara, M., Koshigir, K., & Morita, M. (2003). Recent investigation of the G-parity irregular weak nucleon current in β decays of spin aligned ¹²B and ¹²N. In H. V. Klapdor-Kleingrothaus (Ed.), Beyond 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 (pp. 695-700). (Beyond 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).

Recent investigation of the G-parity irregular weak nucleon current in β decays of spin aligned ¹²B and ¹²N. / Minamisono, K.; Matsuta, K.; Minamisono, T.; Sumikama, T.; Nagatomo, T.; Ogura, M.; Iwakoshi, T.; Yamaguchi, T.; Fukuda, M.; Mihara, M.; Koshigir, K.; Morita, M.

Beyond 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. ed. / H.V. Klapdor-Kleingrothaus. 2003. p. 695-700 (Beyond 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).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Minamisono, K, Matsuta, K, Minamisono, T, Sumikama, T, Nagatomo, T, Ogura, M, Iwakoshi, T, Yamaguchi, T, Fukuda, M, Mihara, M, Koshigir, K & Morita, M 2003, Recent investigation of the G-parity irregular weak nucleon current in β decays of spin aligned ¹²B and ¹²N. in HV Klapdor-Kleingrothaus (ed.), Beyond 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. Beyond 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, pp. 695-700, Beyond 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, 02/7/2.

Minamisono K, Matsuta K, Minamisono T, Sumikama T, Nagatomo T, Ogura M et al. Recent investigation of the G-parity irregular weak nucleon current in β decays of spin aligned ¹²B and ¹²N. In Klapdor-Kleingrothaus HV, editor, Beyond 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. 2003. p. 695-700. (Beyond 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).

Minamisono, K. ; Matsuta, K. ; Minamisono, T. ; Sumikama, T. ; Nagatomo, T. ; Ogura, M. ; Iwakoshi, T. ; Yamaguchi, T. ; Fukuda, M. ; Mihara, M. ; Koshigir, K. ; Morita, M. / Recent investigation of the G-parity irregular weak nucleon current in β decays of spin aligned ¹²B and ¹²N. Beyond 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. editor / H.V. Klapdor-Kleingrothaus. 2003. pp. 695-700 (Beyond 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).

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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.",

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AU - Ogura, M.

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