TY - JOUR
T1 - Spin Manipulation by Use of Nuclear Quadrupole Interactions - Quarks and Medium Effects in the Nucleus
AU - Minamisono, K.
AU - Matsuta, K.
AU - Minamisono, T.
AU - Yamaguchi, T.
AU - Sumikama, T.
AU - Nagatomo, T.
AU - Ogura, M.
AU - Iwakoshi, T.
AU - Mihara, M.
AU - Fukuda, M.
AU - Koshigiri, K.
AU - Morita, M.
N1 - Funding Information:
The present work was partially supported by Research Fellowships of the Japan Society for the Promotion of Science for Young Scientist and by the Grant in Aid for Scientific Research from the Ministry of Education, Culture and Science, Japan and also by the Yamada Science Foundation.
PY - 2002/7
Y1 - 2002/7
N2 - 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.
AB - 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.
KW - Alignment Correlation Term
KW - Axial Charge
KW - G Parity
KW - In-Medium Nucleon Mass Renormalization
KW - β-Ray Angular Distribution
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U2 - 10.1515/zna-2002-6-748
DO - 10.1515/zna-2002-6-748
M3 - Article
AN - SCOPUS:0036619010
SN - 0932-0784
VL - 57
SP - 557
EP - 560
JO - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
JF - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
IS - 6-7
ER -