Spin control and structure of weak nucleon currents in A= 8, 12, 20 and 41 |
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| Authors: | Minamisono K Yamaguchi T Matsuta K Minamisono T Ikeda T Muramoto Y Fukuda M Nojiri Y Kitagawa A Koshigiri K Morita M |
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| Institution: | (1) Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560, Japan;(2) National Institute of Radiological Science, 4-9-1 Anagawa, Inage, Chiba 263, Japan;(3) Department of Physics, Osaka Kyoiku University, Kashiwara 582, Japan;(4) Department of Physics, Josai International University, 1 Gumyo, Togane, Chiba 283, Japan |
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| Abstract: | The β-ray angular distributions from purely spin aligned 12B and 12N were precisely remeasured using a further refined spin-manipulation technique. We determined the amount of a g-parity violating
induced tensor form factor in a weak axial vector current as 2M fT/fA= +0.22 ± 0.05\ (stat.) ± 0.15\ (syst.) ± 0.05\ (theor.). The result is consistent with the theoretical prediction in the
framework of which induced tensor form factor is proportional to u- and d-quark mass difference. To study the g-parity violation
in weak nucleon current systematically, we have started to measure the alignment correlation terms of 8Li, 8B, 20F and 41Sc.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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