Measurement of the neutronβ-asymmetry parameterA0with ultracold neutrons
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Measurement of the neutronβ-asymmetry parameterA0with ultracold neutrons

B. Plaster,R R Rios,H. O. Back,T. J. Bowles,Leah Broussard,R. Carr,Steven Clayton,Scott Currie,B. W. Filippone,Alejandro Garcia,P. Geltenbort,K. P. Hickerson,J. Hoagland,G. E. Hogan,B. Hona,A. T. Holley,Takeyasu Ito,C. -Y. Liu,Jianglai Liu,Mark Makela,R. R. Mammei,J. W. Martin,Dan Melconian,M. P. Mendenhall,Christopher Morris,R. Mortensen,Robert Pattie,A. Pérez Galván,M. L. Pitt,J. C. Ramsey,Robyn J Russell,A. Saunders,R. Schmid,S. J. Seestrom,S K L Sjue,W. E. Sondheim,E. Tatar,B. Tipton,R. B. Vogelaar,B. VornDick,C. Wrede,Y. P. Xu,Hongmin Yan,A. R. Young,Jinqiu Yuan,UCNA Collaboration;B. Plaster;R R Rios;H. O. Back;T. J. Bowles;Leah Broussard;R. Carr;Steven Clayton;Scott Currie;B. W. Filippone;Alejandro Garcia;P. Geltenbort;K. P. Hickerson;J. Hoagland;G. E. Hogan;B. Hona;A. T. Holley;Takeyasu Ito;C. -Y. Liu;Jianglai Liu;Mark Makela;R. R. Mammei;J. W. Martin;Dan Melconian;M. P. Mendenhall;Christopher Morris;R. Mortensen;Robert Pattie;A. Pérez Galván;M. L. Pitt;J. C. Ramsey;Robyn J Russell;A. Saunders;R. Schmid;S. J. Seestrom;S K L Sjue;W. E. Sondheim;E. Tatar;B. Tipton;R. B. Vogelaar;B. VornDick;C. Wrede;Y. P. Xu;Hongmin Yan;A. R. Young;Jinqiu Yuan;UCNA Collaboration;
physical review c 2012 Vol. 86 pp. 055501-
176
collaboration2012physicalmeasurement

Abstract

We present a detailed report of a measurement of the neutron β-asymmetry parameter A0, the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T 2×2π solenoidal spectrometer. The asymmetry was extracted from measurements of the decay electrons in multiwire proportional chamber and plastic scintillator detector packages located on both ends of the spectrometer. From an analysis of data acquired during runs in 2008 and 2009, we report A0=−0.11966±0.00089−0.00140+0.00123, from which we extract a value for the ratio of the weak axial-vector and vector coupling constants of the nucleon, λ=gA/gV=−1.27590±0.00239−0.00377+0.00331. Complete details of the analysis are presented.

Keywords

plastic asymmetry spin polarized ucn ultracold neutrons packages

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DOI:
10.1103/physrevc.86.055501
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https://sciprofiles.com/publication/view/d3ee56f2f...

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ID: 271424
Ref Key: collaboration2012physicalmeasurement
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