@article{oai:sucra.repo.nii.ac.jp:00013236,
 author = {Minamisono, T and Matsuta, K and 山口, 貴之 and Minamisono, K and Fukuda, M and Kitagawa, A and Koshigiri, K},
 issue = {8},
 journal = {PHYSICAL REVIEW LETTERS},
 month = {},
 note = {The axial charge of the weak nucleon axial vector current extracted from the anisotropic beta-ray angular distributions of spin aligned B-12 and N-12 was accounted for mainly in terms of the impulse value y(IA) and the soft pion exchange effect term Y-exch. The experimental value, y = 4.66 +/- 0.06(stat) +/- 0.13(syst), was enhanced by 63% from the impulse value y(IA) = 2.85 which includes the core polarization effect. The experimental excess of 0.54 over the theoretical value y(IA) + y(exch) = 4.12 is accounted for by the in-medium mass reduction from the free nucleon value, if there is such an effect, of about (12 +/- 4)% for the nucleons decaying in the A = 12 triad., Copyright notice(c)1999 American Physical Society. All rights reserved. 
Publisher's version: http://prola.aps.org/abstract/PRL/v82/i8/p1644_1, text, application/pdf},
 pages = {1644--1647},
 title = {In-medium mass renormalization of nucleons detected in the axial charges of the beta decays of spin aligned B-12 and N-12},
 volume = {82},
 year = {1999},
 yomi = {ヤマグチ, タカユキ}
}