The Nab experiment: A precision measurement of unpolarized neutron beta decay
The Nab experiment: A precision measurement of unpolarized neutron beta decay
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Nab 实验:非极化中子 β 衰变的精确测量
DOI:
10.1051/epjconf/201921904002
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发表时间:
2019
影响因子:
--
通讯作者:
Borissenko, D.
中科院分区:
文献类型:
--
作者:
Fry, J.;Alarcon, R.;Baeßler, S.;Balascuta, S.;Palos, L. Barrón;Bailey, T.;Bass, K.;Birge, N.;Blose, A.;Borissenko, D.
Neutron beta decay is one of the most fundamental processes in nuclear physics and provides sensitive means to uncover the details of the weak interaction. Neutron beta decay can evaluate the ratio of axial-vector to vector coupling constants in the standard model, λ =gA/gV, through multiple decay correlations. The Nab experiment will carry out measurements of the electron-neutrino correlation parameterawith a precision of δa/a= 10−3and the Fierz interference termbto δb= 3 × 10−3in unpolarized free neutron beta decay. These results, along with a more precise measurement of the neutron lifetime, aim to deliver an independent determination of the ratio λ with a precision of δλ/λ = 0.03% that will allow an evaluation ofVudand sensitively test CKM unitarity, independent of nuclear models. Nab utilizes a novel, long asymmetric spectrometer that guides the decay electron and proton to two large area silicon detectors in order to precisely determine the electron energy and an estimation of the proton momentum from the proton time of flight. The Nab spectrometer is being commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source at Oak Ridge National Lab. We present an overview of the Nab experiment and recent updates on the spectrometer, analysis, and systematic effects.
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DOI:
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发表时间:
2014
期刊:
影响因子:
--
作者:
A. Salas;P. McGaughey;S. Baeßler;L. Broussard;M. Makela;J. Mirabal;R. Pattie;D. Počanić;S. Sjue;S. Penttilä;W. S. Wilburn;A. Young;B. Zeck;Zhehui Wang
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Zhehui Wang
DOI:
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发表时间:
1957
期刊:
影响因子:
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作者:
J. Jackson;S. Treiman;H. Wyld
通讯作者:
H. Wyld
影响因子:
8.6
作者:
Yue, A. T.;Dewey, M. S.;Wietfeldt, F. E.
通讯作者:
Wietfeldt, F. E.
DOI:
--
发表时间:
2006-04
期刊:
Lawrence Berkeley National Laboratory
影响因子:
--
作者:
Z. Ligeti;A. Ceccucci;Y. Sakai
通讯作者:
Z. Ligeti;A. Ceccucci;Y. Sakai
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
D. Dubbers;H. Abele;H. Abele;S. Baeßler;B. Märkisch;M. Schumann;T. Soldner;O. Zimmer
通讯作者:
O. Zimmer