Bulletin of the American Physical Society
3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 54, Number 10
Tuesday–Saturday, October 13–17, 2009; Waikoloa, Hawaii
Session 2WE: Workshop on Physics with Neutrons II |
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Chair: Yasuhiro Masuda, KEK Room: Kona 5 |
Tuesday, October 13, 2009 2:00PM - 2:30PM |
2WE.00001: EDMs and beyond the standard model in particle physics Invited Speaker: New physics beyond the standard model of particle physics is expected to appear at TeV scale from a viewpoint of naturalness of the Higgs mass, and various experiments are searching for it in direct and indirect way. Electric dipole moments (EDMs) of electron, neutron and atoms are quite sensitive to CP violation in physics beyond the standard model of particle physics. In this talk I will review EDMs in the beyond the SM models, and discuss about related topics. [Preview Abstract] |
Tuesday, October 13, 2009 2:30PM - 3:00PM |
2WE.00002: Development of the neutron electric dipole moment experiment at the SNS Invited Speaker: The nEDM Collaboration is preparing an experiment to run at the Spallation Neutron Source (SNS) to search for the neutron electric dipole moment (EDM) experiment with a sensitivity of $<$10$^{-27} \quad e\cdot cm$ based on the scheme of Golub and Lamoreaux. The collaboration has been pursuing a R{\&}D program to establish the technical feasibility of the design. Many results have been obtained from independent experiments that demonstrate the EDM experiment should work. The data from a number of these preparatory measurements will be presented and discussed in terms of their importance to the final design. The engineering of the project is now ready to produce shop drawings, so a comprehensive picture of the apparatus can be presented. [Preview Abstract] |
Tuesday, October 13, 2009 3:00PM - 3:30PM |
2WE.00003: UCN n-EDM experimental developments at RCNP Invited Speaker: Our KEK-RCNP-Osaka-ICEPP collaboration group led by Y. Masuda of IPNS, KEK and K. Hatanaka of RCNP, Osaka Univ. is developing a new type high intensity UCN (ultracold neutron) source at RCNP, Osaka Univ., for the future experiments on fundamental physics including n-EDM (neutron electric dipole moment) precision measurements, which may disclose origin of the baryon asymmetry in the present universe by providing active evidence of the violation of the time reversal invariance. Our UCN source produces 15 UCN/cm$^3$ at the exit, by the compact combination of the spallation neutron source and the super-fluid He-II moderator, which provides with the best power efficiency. In the present stage, we are trying to establish Ramsey resonance technique for the n-EDM measurements, by studying behavior of UCN and the polarization, using abundant UCNs produced in this source, in addition to the improvement of the source performance. The energy spectrum of UCN, i.e. the velocity distribution, is an important information in the estimation of the false EDM effect such as Bloch-Siegert shift and is found to be well reproduced by the uniform production in phase space. We tried to polarize UCN by the magnetic potential in pure ion foil. The production of polarization itself is found rather easy, namely, the polarization could reach as high as 100\% in the beginning. Average polarization, however, is dominated by the relaxation of polarization during transportation and storage. For the n-EDM measurements in the next generation, our effort should be devoted to the understanding of the geometric phase such as Bloch-Siegert shift which dominates systematic error in the EDM measurements. Our next step will be demonstration of Ramsey resonance and the installation of the co-magnetometer and electric field, to detect geometric phase. [Preview Abstract] |
Tuesday, October 13, 2009 3:30PM - 4:00PM |
2WE.00004: COFFEE BREAK
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Tuesday, October 13, 2009 4:00PM - 4:30PM |
2WE.00005: High Precision Measurements of Neutron Beta-Decay at LANSCE Invited Speaker: High precision measurements of neutron beta-decay can be used to study the standard model of particle physics by testing the unitarity condition of the CKM matrix. Precise measurements of the neutrons' lifetime and one of its angular correlations are needed to determine the necessary standard model parameters for a unitarity test from neutron decay alone. Several experiments are underway at the Los Alamos Neutron Science Center (LANSCE) to measure these parameters using Ultra-Cold Neutrons (UCN). During the last 10 year a program to study neutron physics with UCN has been under development at LANSCE by an international team of scientists. The first experiment of this program, UCNA; which measures the decay correlation between the polarized neutron and the resulting beta particle, is currently running. A neutron lifetime experiment that monitors the decay rate of UCN trapped in a magnetic bottle with a gravitational top is being built and scheduled to run later this year. A second decay correlation experiment; (UCNB), which will measure the decay correlation between the polarized neutron and the resulting anti-neutrino is currently in the research and development phase. This talk will give an overview of these experiments, as well as other highlights from the UCN program at LANSCE. [Preview Abstract] |
Tuesday, October 13, 2009 4:30PM - 5:00PM |
2WE.00006: Neutron Science at J-PARC Invited Speaker: A pulsed cold neutron beamline for the study of neutron optics and fundamental physics (NOP beamline) is under development at the beam port BL05 of the spallation neutron source in the Materials and Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). The J-PARC spallation neutron source is a short pulse machine with the repetition rate of 25 Hz, which is expected to deliver pulsed cold neutrons with the highest instantaneous intensity when the machine power reaches the designed value. Physics measurements in the neutron decay, neutron scattering and neutron interferometry are scheduled at the NOP beamline by taking the advantage of the timing structure of the intense pulsed neutrons. Currently, optical components and detectors for precision measureents are under development. The physics program is being started with the in-flight neutron lifetime measurement. In this paper, we report the present status of the NOP beamline construction and planned measurement. Further extensions to utilize wider wavelength regions to very cold and ultracold regions are also discussed. [Preview Abstract] |
Tuesday, October 13, 2009 5:00PM - 5:30PM |
2WE.00007: Neutron beta decay measurements planned for the SNS Invited Speaker: A cold neutron beam line, dedicated to fundamental neutron physics (FnPB), is presently being completed at the Oak Ridge, TN, Spallation Neutron Source. Among other experiments, the beamline will host a comprehensive set of precise studies of the neutron beta decay. Neutron beta decay is characterised by the decay rate (or its inverse, the neutron lifetime), and a set of decay parameters describing the kinematical and spin correlations among the participating particles. Within the standard model (SM), the neutron lifetime and three decay parameters ($a$, $A$, and $B$) are fixed by two parameters: the $V_{ud}$ element of the Cabibbo-Kobayashi-Maskawa mixing matrix, and $\lambda=G_A/G_V$, the ratio of axial vector and vector nucleon form factors. This overdetermined system provides a unique opportunity to explore possible departures from the simple SM, as well as the nature of such departures, e.g., left-right supersymmetric extensions, leptoquarks, non-$(V-A$) admixtures, etc., with broad implications in subatomic physics. The FnPB neutron beta decay program will include measurements of the neutron lifetime, continuing the present NIST experiment, a measurement of $a$, the electron-neutrino correlation, and $b$, the Fierz interference term, (the ``Nab'' experiment), along with measurements of $A$ and $B$, the correlations between neutron spin and electron and neutrino momenta, respectively, (the ``abBA'' experiment). Current plans for these experiments will be discussed in detail. [Preview Abstract] |
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