TY - JOUR
T1 - Test of time reversal symmetry using polarized 8Li at TRIUMF-ISAC
AU - Murata, J.
AU - Baba, H.
AU - Behr, J. A.
AU - Hata, M.
AU - Hirayama, Y.
AU - Ikeda, M.
AU - Kameda, D.
AU - Kawamura, H.
AU - Kishi, R.
AU - Levy, C. D.P.
AU - Nakaya, Y.
AU - Ninomiya, K.
AU - Nitta, M.
AU - Ogawa, N.
AU - Onishi, J.
AU - Openshaw, R.
AU - Pearson, M.
AU - Seitaibashi, E.
AU - Totsuka, Y.
AU - Toyoda, T.
AU - Uchida, M.
PY - 2011
Y1 - 2011
N2 - A new experimental project called MTV (Mott Polarimetry for T-Violation Experiment), is running at TRIUMF. It aims to achieve the highest precision test of time reversal symmetry in polarized nuclear beta decay by measuring a triple correlation (R-correlation), motivated to search a new physics beyond the standard model. It is because the CKM predicts negligible effects on the u-d quark system. In this experiment, the existence of non-zero transverse electron polarization is examined utilizing the analyzing power of Mott scattering from a thin metal foil. Backward scattering electron tracks are measured using a multi-wire drift chamber event-by-event for the first time. The tracking device eliminates the largest systematic effect, which has been limiting the sensitivity of previous studies. The MTV experiment was commissioned at TRIUMF-ISAC in 2009 using an 80% polarized 8Li beam at 10 Mpps resulting in 3.6% precision on the R-parameter, after performing a feasibility test at KEK-TRIAC in 2008 using an 8% polarized beam at 100 kpps yielding 41% statistical precision. In 2010, a physics production run is scheduled, aiming to reach below 0.1% precision. In this document, the preparation status for the 2010 run and results from the commissioning run are described.
AB - A new experimental project called MTV (Mott Polarimetry for T-Violation Experiment), is running at TRIUMF. It aims to achieve the highest precision test of time reversal symmetry in polarized nuclear beta decay by measuring a triple correlation (R-correlation), motivated to search a new physics beyond the standard model. It is because the CKM predicts negligible effects on the u-d quark system. In this experiment, the existence of non-zero transverse electron polarization is examined utilizing the analyzing power of Mott scattering from a thin metal foil. Backward scattering electron tracks are measured using a multi-wire drift chamber event-by-event for the first time. The tracking device eliminates the largest systematic effect, which has been limiting the sensitivity of previous studies. The MTV experiment was commissioned at TRIUMF-ISAC in 2009 using an 80% polarized 8Li beam at 10 Mpps resulting in 3.6% precision on the R-parameter, after performing a feasibility test at KEK-TRIAC in 2008 using an 8% polarized beam at 100 kpps yielding 41% statistical precision. In 2010, a physics production run is scheduled, aiming to reach below 0.1% precision. In this document, the preparation status for the 2010 run and results from the commissioning run are described.
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U2 - 10.1088/1742-6596/312/10/102011
DO - 10.1088/1742-6596/312/10/102011
M3 - Conference article
AN - SCOPUS:80455158378
VL - 312
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - SECTION 10
M1 - 102011
T2 - International Nuclear Physics Conference 2010, INPC2010
Y2 - 4 July 2010 through 9 July 2010
ER -