Test of time reversal symmetry using polarized 8Li at TRIUMF-ISAC

J. Murata, H. Baba, J. A. Behr, M. Hata, Y. Hirayama, M. Ikeda, D. Kameda, H. Kawamura, R. Kishi, C. D.P. Levy, Y. Nakaya, K. Ninomiya, M. Nitta, N. Ogawa, J. Onishi, R. Openshaw, M. Pearson, E. Seitaibashi, Y. Totsuka, T. ToyodaM. Uchida

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17 Citations (Scopus)


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.

Original languageEnglish
Article number102011
JournalJournal of Physics: Conference Series
Issue numberSECTION 10
Publication statusPublished - 2011
EventInternational Nuclear Physics Conference 2010, INPC2010 - Vancouver, BC, Canada
Duration: 2010 Jul 42010 Jul 9

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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