Determination of the axial-vector weak coupling constant with ultracold neutrons.
Determination of the axial-vector weak coupling constant with ultracold neutrons.
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DOI：
10.1103/physrevlett.105.181803
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发表时间：
2010-07
影响因子：
8.6
通讯作者：
Jianglai Liu;Jianglai Liu;M. Mendenhall;A. Holley;H. Back;T. Bowles;Leah Broussard;R. Carr;Steven Clayton;Scott Currie;B. Filippone;Alejandro Garcia;P. Geltenbort;K. Hickerson;J. Hoagland;G.E Hogan;B. Hona;T. M. Ito;Chen-Yu Liu;M. Makela;R. Mammei;J. Martin;D. Melconian;C. Morris;R. Pattie;A. P. Galván;M. Pitt;B. Plaster;J. Ramsey;R. Rios;R. Rios;R. Russell;A. Saunders;S. Seestrom;W. Sondheim;E. Tatar;R. Vogelaar;B. Vorndick;C. Wrede;H. Yan;A. Young
中科院分区：
文献类型：
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作者：
Jianglai Liu;Jianglai Liu;M. Mendenhall;A. Holley;H. Back;T. Bowles;Leah Broussard;R. Carr;Steven Clayton;Scott Currie;B. Filippone;Alejandro Garcia;P. Geltenbort;K. Hickerson;J. Hoagland;G.E Hogan;B. Hona;T. M. Ito;Chen-Yu Liu;M. Makela;R. Mammei;J. Martin;D. Melconian;C. Morris;R. Pattie;A. P. Galván;M. Pitt;B. Plaster;J. Ramsey;R. Rios;R. Rios;R. Russell;A. Saunders;S. Seestrom;W. Sondheim;E. Tatar;R. Vogelaar;B. Vorndick;C. Wrede;H. Yan;A. Young
利用来自洛斯阿拉莫斯中子科学中心脉冲散裂超冷中子源的极化超冷中子，对中子衰变β不对称性A₀进行了精确测量。结合2008年和2009年的数据，我们得到了A₀=-0.119 66±0.000{-0.001 40}{+0.001 23}，由此我们确定了核子的轴向矢量与矢量弱耦合之比g{A}/g{V}=-1.275 90{-0.004 45}{+0.004 09}。
A precise measurement of the neutron decay β asymmetry A₀ has been carried out using polarized ultracold neutrons from the pulsed spallation ultracold neutron source at the Los Alamos Neutron Science Center. Combining data obtained in 2008 and 2009, we report A₀ = -0.119 66±0.000 89{-0.001 40}{+0.001 23}, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon g{A}/g{V}=-1.275 90{-0.004 45}{+0.004 09}.