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    Title of Project:Time reversal symmetry violation test with new generation ultracold neutrons
    Y. Masuda
    【Purpose and Background of the Research】 Many theories beyond the standard model are proposed, since the standard model can’t explain the baryon asymmetry in the universe, can’t resolve the hierarchy problem and can’t include gravity. The neutron electric dipole moment (n EDM) places a strict constraint on these theories. The early stage of SUSY was already excluded by the n EDM measurement. Recent SUSY predicts a n EDM of 10-25 to 10-28 e·cm. The most precise measurement was carried out at ILL, which showed the upper limit of 3×10-26 e·cm. The precision was limited by UCN counting statistics, namely UCN density in the EDM cell. We have been developing a new generation ultracold neutron (UCN) source for n EDM measurement.[1] We will increase the UCN density higher than 1×103 UCN/cm3, for the precision n EDM measurement.
    Ultracold neutrons
    CP violation
    Citations (0)
    New measurements of the neutron electric dipole moment
    JETP Letters (2014)
    A. П. СеребровE. A. KolomenskiyA. N. PirozhkovI. A. KrasnoschekovaA. V. Vassiljev
    Ultracold neutrons
    Neutron magnetic moment
    Citations (39)
    Searches for Electric Dipole Moment of the Neutron and Ultracold Neutrons
    Uspekhi Fizicheskih Nauk (1969)
    F.L. Shapiro
    Ultracold neutrons
    Neutron magnetic moment
    Citations (0)
    Taking into account the Earth’s rotation in experiments on the search of the electric dipole moment of the neutron
    Physics of Particles and Nuclei Letters (2007)
    Alexander J. Silenko
    Ultracold neutrons
    Bond dipole moment
    Neutron magnetic moment
    Citations (0)
    The search for the neutron electric dipole moment at PSI
    arXiv (Cornell University) (2021)
    G. PignolP. Schmidt-Wellenburg
    The existence of a nonzero permanent electric dipole moment (EDM) of the neutron would reveal a new source of CP violation and shed light on the origin of the matter--antimatter asymmetry of the Universe. The sensitivity of current experiments using stored ultracold neutrons (UCN) probes new physics beyond the TeV scale. Using the UCN source at the Paul Scherrer Institut, the nEDM collaboration has performed the most sensitive measurement of the neutron EDM to date, still compatible with zero ($|d_n|<1.8\times 10^{-26} \, e {\rm cm}$, C.L.90%). A new experiment designed to improve the sensitivity by an order of magnitude, n2EDM, is currently in construction.
    Ultracold neutrons
    CP violation
    Citations (0)
    Search for the Neutron Electric Dipole Moment
    AIP conference proceedings (2010)
    Brad PlasterRicardo AlarcónP. L. ColeAndrés J. KreinerHugo F. Arellano
    Searches for the neutron electric dipole moment (EDM) are motivated by their highly suppressed Standard Model value. The observation of a non‐zero signal in the next generation of experiments would point unambiguously to the existence of new physics beyond the Standard Model. Several ongoing efforts worldwide hold the potential for an up to two‐orders‐of‐magnitude improvement beyond the current upper limit on the neutron EDM of 2.9×10−6 e‐cm. In this talk, I review the basic measurement principles of neutron EDM searches, then discuss a new experiment to be carried out in the United States at the Spallation Neutron Source with ultracold neutrons and an in‐situ 3He "co‐magnetometer".
    Ultracold neutrons
    Neutron magnetic moment
    Citations (1)
    A proposed method of measuring the electric-dipole moment of the neutron by ultracold neutron interferometry
    Michael A. PeshkinG. R. RingoT. Dombeck
    The use of an ultracold neutron interferometer incorporating an electrostatic accelerator having a strong electric field gradient to accelerate neutrons by their possible electric dipole moment is proposed as a method of measuring the neutron electric dipole moment. The method appears to have the possibility of extending the sensitivity of the measurement by several orders of magnitude, perhaps to 10{sup -30} e-cm. 9 refs., 3 figs.
    Ultracold neutrons
    Neutron magnetic moment
    Citations (0)
    The search for the neutron electric dipole moment at PSI
    arXiv (Cornell University) (2021)
    G. PignolP. Schmidt-Wellenburg
    The existence of a nonzero permanent electric dipole moment (EDM) of the neutron would reveal a new source of CP violation and shed light on the origin of the matter--antimatter asymmetry of the Universe. The sensitivity of current experiments using stored ultracold neutrons (UCN) probes new physics beyond the TeV scale. Using the UCN source at the Paul Scherrer Institut, the nEDM collaboration has performed the most sensitive measurement of the neutron EDM to date, still compatible with zero ($|d_n|<1.8\times 10^{-26} \, e {\rm cm}$, C.L.90%). A new experiment designed to improve the sensitivity by an order of magnitude, n2EDM, is currently in construction.
    Ultracold neutrons
    CP violation
    Citations (0)
    New measurement of the electric dipole moment of the neutron
    Physics Letters B (1992)
    I. AltarevYu. V. BorisovN.V. BorovikovaС. Н. ИвановE. A. Kolomensky
    Ultracold neutrons
    Neutron magnetic moment
    Citations (202)
    A search for the electric dipole moment of the neutron using ultracold neutrons
    Nuclear Physics A (1980)
    I. AltarevYu. V. BorisovA.B. BrandinA. I. EgorovВ. Ф. Ежов
    Ultracold neutrons
    Neutron magnetic moment
    Neutron time-of-flight scattering
    Citations (60)