Spin Manipulation by Use of Nuclear Quadrupole Interactions - Quarks and Medium Effects in the Nucleus

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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The alignment correlation terms in the β-ray angular distributions from the purely spin aligned mirror pair 12B(Iπ = l+,T1/2 = 20.2ms) and 12N(Iπ = 1+,T1/2 = 11.0 ms) were precisely measured to place a new limit on the G-parity conservation law. For the creation of the alignment, the spin manipulation technique was applied, which utilized the nuclear quadrupole interactions. The G- parity violating induced tensor coefficient was determined to be 2M fT/FA = –0.15 ± 0.12 ± 0.05 (theor.), which is consistent with the theoretical prediction based on QCD in which 2M fT /FA is proportional to the mass difference between up and down quarks which constitute the nucleon. Also determined the axial charge to be y = 4.90 ± 0.10 (90% CL). From the result, we have found that the nucleon mass inside the nucleus is reduced (16 ± 4)% relative to the free nucleon mass.

Original languageEnglish
Pages (from-to)557-560
Number of pages4
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Issue number6-7
Publication statusPublished - 2002 Jul
Externally publishedYes


  • Alignment Correlation Term
  • Axial Charge
  • G Parity
  • In-Medium Nucleon Mass Renormalization
  • β-Ray Angular Distribution

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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