极化5ΛHe非介子弱衰变中质子的排他性不对称性测量
核实验
2007-05-23 v1
摘要
通过选取在背对背运动学中发射的质子-中子对,首次在极化 5ΛHe 超核的非介子弱衰变中测量了在 Λp → np 过程中排他性发射的质子的不对称性参数 αp^NM。高极化的 5ΛHe 是在 1.05 GeV/c 下通过 (π+,K+) 反应在 ±15° 散射角范围内大量产生的。所获得的值 αp^NM = 0.31 ± 0.22,以及包含性质子的值 αp^NM = 0.11 ± 0.08 ± 0.04,虽然与这些计算能很好重现非介子弱衰变分支比,但与近期约 -0.6 的理论值大相径庭。
引用
@article{arxiv.nucl-ex/0509016,
title = {Exclusive proton asymmetry measurement in non-mesonic weak decay of polarized 5_Lambda_He},
author = {T. Maruta and S. Ajimura and K. Aoki and A. Banu and H. Bhang and T. Fukuda and O. Hashimoto and J. I. Hwang and S. Kameoka and B. H. Kang and E. H. Kim and J. H. Kim and M. J. Kim and Y. Miura and Y. Miyake and T. Nagae and M. Nakamura and S. N. Nakamura and H. Noumi and S. Okada and Y. Okayasu and H. Outa and H. Park and P. K. Saha and Y. Sato and M. Sekimoto and T. Takahashi and H. Tamura and K. Tanida and A. Toyoda and K. Tsukada and T. Watanabe and H. J. Yim},
journal= {arXiv preprint arXiv:nucl-ex/0509016},
year = {2007}
}
备注
4pages, 2 figures, submitted to Physical Review Letters