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1. The MTV Experiment: from T-violation To Lorentz-violation

Author

C. D. P. Levy, Saki Tanaka, H. Baba, S. Ozaki, Y. Totsuka, R. Openshaw, Fumiya Goto, M. R. Pearson, R. Tanuma, K. Ninomiya, Y. Sakamoto, Hirokazu Kawamura, J. Onishi, Shimizu Hirofumi, E. Watanabe, Y. Nakaya, Masaaki Kitaguchi, S. Inaba, M. Yokohashi, J. Murata, Y. Tanaka, Y. Shimizu, H. Masuda, and John Behr

Subjects
Physics, Scattering, Lorentz transformation, media_common.quotation_subject, Detector, Electron, Lorentz covariance, Mott scattering, Tracking (particle physics), Asymmetry, Nuclear physics, symbols.namesake, symbols, media_common
Abstract

The MTV (Mott Polarimetry for T-Violation) experiment is running at TRIUMF-ISAC (Isotope Separator and ACcelerator), searching for a large T violation in polarized Li-8 beta decay via measurements of the triple vector correlation, R, in the beta decay rate function. The left/right backward scattering asymmetry of Mott scattering from a thin metal foil is measured using an electron tracking detector including a cylindrical drift chamber (CDC). To achieve 10-ppm precision in the Mott scattering asymmetry, we performed multiple studies on the expected systematic effects. The sources of the systematics have been identified and calibration systems have been developed to evaluate the fake effects. The first physics data was collected in 2016 and significantly improved on the result of our previous measurement, which achieved 100-ppm precision in 2010 using the first generation detector (planer drift chamber) at TRIUMF. The data measurement status, together with the results of the systematics studies, is described here. In addition to the T violation, we are preparing to test the Lorentz invariance in the weak sector via our Mott analyzer system. Unexplored Lorentz violating correlations can be tested using the MTV experimental setup. The testing principle and preparation status are also described here.

Published
2017

2. First result from the MTV experiment at TRIUMF searching T-violation in nuclear beta decay

Author

M. Ikeda, R. Kishi, H. Baba, T. Kato, E. Seitaibashi, Y. Totsuka, R. Tanuma, Hironori Nishio, T. Iguri, C. D. P. Levy, Saki Tanaka, K. Watanabe, T. Toyoda, M. R. Pearson, J. Murata, K. Ninomiya, R. Openshaw, Hirokazu Kawamura, John Behr, J. Onishi, and Y. Nakaya

Subjects
Physics, Nuclear and High Energy Physics, Scattering, media_common.quotation_subject, Polarimetry, Polarimeter, Electron, Polarization (waves), Beta decay, Asymmetry, Nuclear physics, Transverse plane, Nuclear Experiment, media_common
Abstract

The MTV experiment (Mott Polarimetry for T-Violation Experiment) is running from 2009 at TRIUMF, which aims to search a large non-standard T-Violation in polarized nuclear beta decay. Existence of transverse polarization of electrons emitted from polarized 8Li nuclei, which are produced at TRIUMF-ISAC and stopped inside an aluminum stopper, is investigated. We utilize a Mott polarimeter consists of a planer drift chamber, measuring backward scattering left-right asymmetry from a thin lead analyzer foil. In this paper, preliminary results from the first physics run performed in 2010 are described.

Published
2014

3. The MTV experiment: a test of time reversal symmetry using polarized 8Li

Author

E. Seitaibashi, Yoshikazu Hirayama, N. Ogawa, M. R. Pearson, T. Toyoda, T. Kato, K. Ninomiya, M. Ikeda, C. D. P. Levy, Saki Tanaka, R. Kishi, H. Baba, J. Onishi, Y. Nakaya, John Behr, Hirokazu Kawamura, J. Murata, R. Openshaw, Y. Totsuka, R. Tanuma, and T. Iguri

Subjects
Physics, Nuclear and High Energy Physics, Scattering, Polarimetry, Electron, Mott scattering, Condensed Matter Physics, Polarization (waves), Atomic and Molecular Physics, and Optics, Triple correlation, Nuclear physics, Transverse plane, T-symmetry, Physics::Accelerator Physics, Physical and Theoretical Chemistry
Abstract

The MTV (Mott Polarimetry for T-Violation Experiment) experiment at TRIUMF-ISAC (Isotope Separator and ACcelerator), which aims to achieve the highest precision test of time reversal symmetry in polarized nuclear beta decay by measuring a triple correlation (R-correlation), is motivated by the search for a new physics beyond the Standard Model. 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 for the first time. The MTV experiment was commissioned at ISAC in 2009 using an 80%polarized 8Li beam at 107 pps, resulting in 0.1%statistical precision on the R-parameter in the first physics run performed in 2010. Next generation cylindrical drift chamber (CDC) is now being installed for the future run.

Published
2013

4. The MTV experiment: searching for T-violation in polarized Li-8 at TRIUMF

Author

M. R. Pearson, Fumiya Goto, Y. Sakamoto, Y. Nakaya, Y. Totsuka, John Behr, J. Onishi, S. Inaba, E. Watanabe, Hirokazu Kawamura, Hirohiko M. Shimizu, R. Openshaw, J. Murata, Y. Tanaka, H. Baba, R. Tanuma, C. D. P. Levy, Saki Tanaka, H. Masuda, Y. Shimizu, M. Yokohashi, K. Ninomiya, and Masaaki Kitaguchi

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, Polarimetry, Polarimeter, Mott scattering, Condensed Matter Physics, 01 natural sciences, Asymmetry, Measure (mathematics), Atomic and Molecular Physics, and Optics, Nuclear physics, Transverse plane, 0103 physical sciences, Thin metal, High Energy Physics::Experiment, Condensed Matter::Strongly Correlated Electrons, Physical and Theoretical Chemistry, 010306 general physics, media_common
Abstract

The MTV experiment (Mott Polarimetry for T-Violation Experiment) is running at TRIUMF, to search for a large T-violating transverse electron-polarization in polarized 8Li β-decay. We aim at reaching precision of 10−4 for the R-correlation, which is defined as a T-violating triple vector correlation in the β-decay rate function. A Mott polarimeter system using a CDC (Cylindrical Drift Chamber) is used to measure the left-right scattering asymmetry in the Mott scattering from a thin metal foil. In the present study, we aim to discuss systematic effects in Mott polarimetry using the CDC.

Published
2016

5. Status of TACTIC: A detector for nuclear astrophysics

Author

G. Sheffer, Götz Ruprecht, T. Kirchner, P. Mumby-Croft, S. P. Fox, B. R. Fulton, Alison Laird, R. Openshaw, M. M. Pavan, P.L. Walden, L. Buchmann, D. Gigliotti, P. Amaudruz, and J. Pearson

Subjects
Physics, Nuclear and High Energy Physics, Interaction point, Physics::Instrumentation and Detectors, business.industry, Detector, Tracking (particle physics), Charged particle, Anode, Nuclear physics, Optics, Gas electron multiplier, Nuclear astrophysics, business, Instrumentation, Beam (structure)
Abstract

A new detector for nuclear astrophysics studies is being designed and built by TRIUMF and the University of York. The TRIUMF Annular Chamber for Tracking and Identification of Charged particles (TACTIC) is designed to detect low-energy charged particles from inverse kinematics reaction studies performed at the relevant astrophysical energies. TACTIC is a cylindrical ionisation/time-projection chamber with segmented anode strips, which allow the dE/dx of the particle to be determined along with the total energy. Information from drift times allows the particle trajectory to be reconstructed. This in turn identifies the interaction point along the beam axis and hence the centre of mass energy of the reaction. To amplify the expected weak signals, a gas electron multiplier (GEM) will be used in place of the usual Frisch grid. Full digital readout of the charge and timing of each anode strip will be achieved with flash ADC cards allowing pulse shape analysis of the signals.

Published
2007

6. Status of the TRIUMF annular chamber for the tracking and identification of charged particles (TACTIC)

Author

P. Mumby-Croft, L. Buchmann, B. R. Fulton, T. Kirchner, M. M. Pavan, S. P. Fox, Alison Laird, R. Openshaw, G. Sheffer, Götz Ruprecht, D. Gigliotti, P.L. Walden, J. Pearson, and P. Amaudruz

Subjects
Nuclear reaction, Nuclear physics, Physics, Nuclear and High Energy Physics, Time projection chamber, Nuclear Theory, Ionization chamber, Nuclear astrophysics, Nuclear fusion, Electron, Nuclear Experiment, Tracking (particle physics), Charged particle
Abstract

TACTIC (TACTIC web site: http://tactic.triumf.ca) is a new detector for low-energy nuclear reactions currently under development at TRIUMF. The cylindrical ionization chamber allows three-dimensional reconstruction of particle tracks by means of a two-dimensional anode array combined with a TOF measurement of the drift electrons. In addition, the integrated charge for each pulse provides information about the energy loss of the particle and therefore allows a better identification of the nuclear species producing the track. The geometry of TACTIC covers a large angular range permitting the measurement of differential cross-sections over a large solid angle. It will be ideal for investigations of nuclear processes pertinent to the field of nuclear astrophysics.

Published
2006

7. Erratum to: 'Nuclear effects on R=σ/σ in deep-inelastic scattering'

Author

H. Avakian, Alan M. Nathan, F.H. Heinsius, E. R. Kinney, A. Avetisian, A. Jgoun, K. Ackerstaff, Klaus Rith, M. Henoch, P. Geiger, E. E. W. Bruins, C. Grosshauser, R. A. Ristinen, J. M. Niczyporuk, N. Meyners, A. Airapetian, Y. Naryshkin, A. Brull, Brons, A. Reali, P. Lenisa, A. Izotov, A. Gute, J. Seibert, T. Shin, V. Vikhrov, J.-O. Hansen, Manuella Vincter, V. A. Kozlov, H. Kolster, Igor Akushevich, A. Borissov, F. Garibaldi, J. van Hunen, B. W. Filippone, A.O. Mateos, S. Yoneyama, L. G. Greeniaus, Haiyan Gao, W. Lachnit, G. S. Kyle, Michael Tytgat, R. Mussa, B. D. Fox, Wolfgang Lorenzon, W.-D. Nowak, M. Kurisuno, M. Guidal, R. C. W. Henderson, S. Brauksiepe, Yasuhiro Sakemi, J. Blouw, M. Sutter, B. Tipton, M. Amarian, R. Openshaw, R. J. Holt, J.E. Belz, E. De Sanctis, E. C. Aschenauer, V. A. Korotkov, Hans von der Schmitt, V. Shutov, B. Bains, M. Ferstl, S. Taroian, G. P. Capitani, A. Kisselev, M. Kolstein, P. Rossi, G. van der Steenhoven, F. Masoli, J. Visser, M. Ruh, S. Belostotski, A. Golendukhin, Y. Gärber, S. Frullani, Jinsong Ouyang, C. Simani, Naomi C R Makins, Y. Holler, M. Nupieri, W. Hoprich, H. Tallini, F. Neunreither, U. Stoesslein, H. Fischer, M. Hartig, L. H. Kramer, Hiroaki Kobayashi, A. Fechtchenko, K. Fiedler, J. W. Martin, J. Wendland, D. Hasch, V. Gyurjian, E. Cisbani, O. Grebeniouk, E. Volk, Ralf Hertenberger, B. Bray, T. A. Shibata, K. Shibatani, K. Königsmann, Wolfgang Korsch, R.O. Avakian, P. F. Dalpiaz, H. Ihssen, T. Wise, S. Bernreuther, F. Meissner, K. Woller, F. Schmidt, O. Häusser, A. Schwind, M. Spengos, R. P. Redwine, M. Beckmann, J. F. J. van den Brand, I.A. Savin, D. De Schepper, A. Dvoredsky, J. P. Haas, P.W. Green, Miller, E. Devitsin, P. Kitching, H. E. Jackson, P.K.A. de Witt Huberts, Michael Pitt, R. D. McKeown, V. G. Krivokhijine, G.R. Court, G. Elbakian, Andreas Schäfer, W. Brückner, M. McAndrew, C. Baumgarten, Ralf Kaiser, B. R. Owen, Ross Milner, F. K. Martens, C. Scarlett, E. Steffens, G. Gavrilov, Valeria Muccifora, A. Nagaitsev, Alessandra Fantoni, Michael Düren, P. Chumney, G. Graw, Michel Vetterli, A. Simon, M. Bouwhuis, H. Böttcher, S. F. Pate, H. J. Bulten, J. Stewart, N. Akopov, W. Wander, K. Sinram, V. Gharibyan, Mauro Iodice, V. Papavassiliou, R. Van de Vyver, G. M. Urciuoli, C. A. Miller, J. Ely, J. Franz, E. Thomas, G. Schnell, N. Koch, S. Potashov, S. E. Williamson, H. Zohrabian, P. Carter, M. Kirsch, Adel Terkulov, Dirk Ryckbosch, David H. Potterveld, P. Di Nezza, Th. Benisch, B. Braun, Thomas O'Neill, F. Menden, K. P. Schüler, S. Rudnitsky, A. Metz, Nicola Bianchi, O. Mikloukho, A. R. Reolon, Kevin L. McIlhany, G. Rakness, P. Slavich, Jeffrey Brack, J. Stenger, and W. Haeberli

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section.transverse, Deuterium, Bibliography, Deep inelastic scattering
Published
2003

8. A search for two body muon decay signals

Author

J. Hu, R. E. Mischke, E. L. Mathie, M. D. Hasinoff, R. S. Henderson, R. Tacik, D. D. Koetke, R. Poutissou, R. E. Tribble, V. Selivanov, B. Shin, J. F. Bueno, G. Sheffer, K. Olchanski, A. Hillairet, R. Bayes, D. R. Gill, R. P. MacDonald, T. D. S. Stanislaus, R. Openshaw, C. A. Gagliardi, Glenn M. Marshall, J. M. Poutissou, A. Gaponenko, W. Faszer, M. C. Fujiwara, P. Gumplinger, Yu. I. Davydov, A. Olin, A. Grossheim, and P. Depommier

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, 010308 nuclear & particles physics, Branching fraction, media_common.quotation_subject, High Energy Physics::Phenomenology, FOS: Physical sciences, Parity (physics), 01 natural sciences, Asymmetry, High Energy Physics - Experiment, Massless particle, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, Twist, 010306 general physics, Boson, Lepton, media_common
Abstract

Lepton family number violation is tested by searching for $\mu^+\to e^+X^0$ decays among the 5.8$\times 10^8$ positive muon decay events analyzed by the TWIST collaboration. Limits are set on the production of both massless and massive $X^0$ bosons. The large angular acceptance of this experiment allows limits to be placed on anisotropic $\mu^+\to e^+X^0$ decays, which can arise from interactions violating both lepton flavor and parity conservation. Branching ratio limits of order $10^{-5}$ are obtained for bosons with masses of 13 - 80 MeV/c$^2$ and with different decay asymmetries. For bosons with masses less than 13 MeV/c$^{2}$ the asymmetry dependence is much stronger and the 90% limit on the branching ratio varies up to $5.8 \times 10^{-5}$. This is the first study that explicitly evaluates the limits for anisotropic two body muon decays., Comment: 7 pages, 5 figures, 2 tables, accepted by PRD

Published
2014

9. MTV/MTV-G Experiment at TRIUMF Search of T-Violation and Gravity Signal at Nuclear Scale

Author

K. Ninomiya, Y. Nakaya, J. Onishi, Phil Levy, John A. Behr, Hidetada Baba, R. Tanuma, Mathew Pearson, Reiya Narikawa, Saki Tanaka, J. Murata, Hirokazu Kawamura, Shuntaro Saiba, Y. Totsuka, T. Iguri, and R. Openshaw

Subjects
Physics, Nuclear physics, Gravitation, Thomas precession, Gravitational field, Polarimetry, Polarimeter, Electron, Polarization (waves), Geodetic effect
Abstract

The MTV-G (MTV-Gravity) experiment is aiming to detect a strong gravitational field at around nuclear scale, utilizing an electron polarimeter of the MTV (Mott Polarimetry for T-Violation) experiment [1], which is searching a large T-Violating electron transverse polarization emitted in polarized Li-8 beta decay. The MTV experiment is running at TRIUMF-ISAC since 2009, yielding the highest precision test of T-Violation. The extreme sensitivity of the MTV polarimeter gives us an opportunity to perform a new type of gravity experiment. A modification of gravitational inverse square law at a microscopic scale is predicted by a large extra-dimension model in order to explain the hierarchy problem. The strong gravitational field can be detected as a large spin precession of electrons scattered from nuclei, caused by the “Geodetic precession” as a result of a warped space-time around the nuclear mass. In this experiment, longitudinal polarization of electrons emitted from a 90 Sr source is transferred into a transverse polarization via electromagnetic Thomas precession and possibly via the Geodetic precession.

Published
2014

10. Report of the Next Generation TRIUMF-MTV Experiment Run-IV Using Cylindrical Drift Chamber

Author

J. Onishi, Shuntaro Saiba, M. Ikeda, M. R. Pearson, J. Murata, Hirokazu Kawamura, Y. Totsuka, R. Tanuma, Reiya Narikawa, Saki Tanaka, E. Seitaibashi, John Behr, T. Iguri, H. Baba, K. Ninomiya, P. Levy, Y. Nakaya, and R. Openshaw

Subjects
Nuclear physics, Physics, Spectrum analyzer, Transverse plane, Scattering, media_common.quotation_subject, Polarimetry, Polarimeter, Electron, Nuclear Experiment, Polarization (waves), Asymmetry, media_common
Abstract

th , 2013) The MTV (Mott polarimetry for T-Violation) experiment is running from 2009 at TRIUMF, which aims to search a large non-standard T-Violation in polarized nuclear beta decay. Existence of a large transverse polarization of electrons emitted from polarized Li-8 nuclei, which are produced at TRIUMF-ISAC and stopped inside an aluminum stopper, is investigated. We utilize a Mott polarimeter consists of a CDC (Cylindrical Drift Chamber), measuring backward scattering left-right asymmetry from a thin lead analyzer foil. In this paper, results from the final performance test run using CDC performed in 2012 are described.

Published
2014

11. Search of non-standard strong gravity at nuclear scale using electron spin geodetic precession

Author

Matthew Pearson, Saki Tanaka, R. Tanuma, Reiya Narikawa, Y. Totsuka, J. Onishi, J. Murata, R. Openshaw, Y. Nakaya, K. Ninomiya, and Shuntaro Saiba

Subjects
Nuclear physics, Gravitation, Physics, Gravitational field, Strong gravity, QC1-999, Electron, Polarization (waves), Yukawa interaction, Geodetic effect, Exotic atom
Abstract

The MTV-G project was started in 2011 to explore a strong gravitational field at a nuclear scale in an electron double scattering experiment, utilizing an experimental technique of the MTV experiment, which searches a electron’s T-Violating transverse polarization in nuclear beta decay at TRIUMF-ISAC. In addition to this new experiment, we have also performed a re-analysis of spectroscopic data of exotic atoms, in a gravitational point of view. From these two studies, we set new constraints on possible new Yukawa interaction at sub-mm scale, as a test of gravitational inverse square law.

Published
2014

12. T-Violation experiment at TRIUMF-ISAC using polarized 8Li

Author

Y. Nakaya, Hirokazu Kawamura, R. Openshaw, M. Ikeda, R. Kishi, John Behr, Shuntaro Saiba, M. R. Pearson, K. Ninomiya, R. Tanuma, Reiya Narikawa, J. Onishi, H. Baba, J. Murata, E. Seitaibashi, C. D. P. Levy, Y. Totsuka, T. Iguri, Saki Tanaka, and T. Toyoda

Subjects
Physics, Nuclear physics, Physics beyond the Standard Model, QC1-999, Polarimetry, Astrophysics, Triple correlation, Symmetry (physics)
Abstract

Motivated by a search for a new physics beyond the standard model, the MTV experiment (Mott Polarimetry for T-Violation Experiment) is intended to achieve the highest precision test of time-reversal symmetry in polarized nuclear beta decay by measuring a triple correlation (the R -correlation). The first physics run of the MTV experiment was performed in 2010 at TRIUMF-ISAC. This paper gives preliminary results and describes the next generation setup, which involves a cylindrical drift chamber.

Published
2014

13. TWIST- The TRIUMF weak interaction symmetry test the Michel parameters from μ+ decay

Author

R. Manweiler, Yu. I. Davydov, P. Gumplinger, A. Khruchinsky, R. L. Helmer, R. MacDonald, R. Poutissou, J. M. Poutissou, J. Doornbos, A. Gaponenko, T. D. S. Stanislaus, M. A. Quraan, G. Price, P. M. Nord, F. Sobratee, M. A. Vasiliev, W. Faszer, J.C. Hardy, A. Olin, D.F. Ottewell, V. Selivanov, G. M. Stinson, J. Soukup, D. R. Gill, T. A. Porcelli, J. R. Musser, S. C. Wang, P. Kitching, N. L. Rodning, B. Shin, H. C. Walter, D.H. Wright, J. A. Macdonald, P.W. Green, T. Mathie, V. Torokhov, P. Depommier, D. D. Koetke, J. Schaapman, M. D. Hasinoff, D. Maas, C. A. Gagliardi, Glenn M. Marshall, R. Openshaw, E. Korkmaz, R. Henderson, W. Andersson, R. E. Tribble, G. Sheffer, and R. Tacik

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Spectrometer, Physics::Instrumentation and Detectors, Electroweak interaction, Superconducting magnet, Weak interaction, Atomic and Molecular Physics, and Optics, Magnetic field, Nuclear physics, Beamline, Michel parameters, High Energy Physics::Experiment
Abstract

We propose to make the first high precision measurements of nearly the entire differential spectrum (in energy and angle) of positrons from the decay of polarized muons. The main goal of the experiment is the precise testing of the ( V - A ) structure of electroweak interactions in the framework of the SU (2) L × U (1) model. Highly polarized “surface” μ + from the TRIUMF M13 beamline will enter a large volume, high field superconducting magnet on axis and will stop in a thin target at its center. The e + from the muon decay will be precisely tracked in the magnetic field using small-cell planar drift chambers. This spectrometer has been simulated with GEANT and EGS4 and has been demonstrated to meet the precision requirements.

Published
2001

14. Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High-pTHadrons at HERMES

Author

A. Airapetian, N. Akopov, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, C. Baumgarten, M. Beckmann, S. Belostotski, J. E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, W. Brückner, A. Brüll, H. J. Bulten, G. P. Capitani, P. Carter, P. Chumney, E. Cisbani, G. R. Court, P. F. Dalpiaz, E. De Sanctis, D. De Schepper, E. Devitsin, P. K. A. de Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, A. Fantoni, M. Ferstl, K. Fiedler, B. W. Filippone, H. Fischer, B. Fox, J. Franz, S. Frullani, M.-A. Funk, Y. Gärber, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, A. Golendukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Grosshauser, M. Guidal, A. Gute, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, F. H. Heinsius, R. Henderson, M. Henoch, R. Hertenberger, Y. Holler, R. J. Holt, W. Hoprich, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, R. Kaiser, E. Kinney, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, V. Korotkov, W. Korsch, V. Kozlov, L. H. Kramer, M. Kurisuno, G. Kyle, W. Lachnit, W. Lorenzon, N. C. R. Makins, F. K. Martens, J. W. Martin, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R. D. McKeown, F. Meissner, F. M. Menden, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. Milner, A. Most, V. Muccifora, Y. Naryshkin, A. M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, T. G. O'Neill, R. Openshaw, J. Ouyang, B. R. Owen, S. F. Pate, S. Potashov, D. H. Potterveld, G. Rakness, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, C. Scarlett, A. Schäfer, F. Schmidt, H. Schmitt, G. Schnell, K. P. Schüler, A. Schwind, J. Seibert, T.-A. Shibata, K. Shibatani, T Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, P. Slavich, M. Spengos, E. Steffens, J. Stenger, J. Stewart, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, B. Tipton, M. Tytgat, G. M. Uriuoli, R. van de Vyver, J. F. J. van den Brand, G. van der Steenhoven, J. J. van Hunen, M. C. Vetterli, V. Vikhrov, M. G. Vincter, J. Visser, E. Volk, W. Wander, J. Wendland, S. E. Williamson, T. Wise, K. Woller, S. Yoneyama, and H. Zohrabian

Subjects
HERMES experiment, Physics, Particle physics, media_common.quotation_subject, Hadron, General Physics and Astronomy, HERA, Polarization (waves), Deep inelastic scattering, Asymmetry, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Storage ring, media_common
Abstract

We present a measurement of the longitudinal spin asymmetry A|| in photoproduction of pairs of hadrons with high transverse momentum pT. Data were accumulated by the HERMES experiment using a 27.5 GeV polarized positron beam and a polarized hydrogen target internal to the HERA storage ring. For h^+h^- pairs with _(pT)^(h1)>1.5GeV/c and _(pT)^(h2)>1.0GeV/c, the measured asymmetry is A_(||) = -0.28±0.12(stat)±0.02(syst). This negative value is in contrast to the positive asymmetries typically measured in deep inelastic scattering from protons, and is interpreted to arise from a positive gluon polarization.

Published
2000

15. Nuclear effects on R=σL/σT in deep-inelastic scattering

Author

K Ackerstaff, A Airapetian, N Akopov, I Akushevich, M Amarian, E.C Aschenauer, H Avakian, R Avakian, A Avetissian, B Bains, C Baumgarten, M Beckmann, S Belostotski, J.E Belz, Th Benisch, S Bernreuther, N Bianchi, J Blouw, H Böttcher, A Borissov, M Bouwhuis, J Brack, S Brauksiepe, B Braun, B Bray, St Brons, W Brückner, A Brüll, E.E.W Bruins, H.J Bulten, G.P Capitani, P Carter, P Chumney, E Cisbani, G.R Court, P.F Dalpiaz, E De Sanctis, D De Schepper, E Devitsin, P.K.A de Witt Huberts, P Di Nezza, M Düren, A Dvoredsky, G Elbakian, J Ely, A Fantoni, A Fechtchenko, M Ferstl, K Fiedler, B.W Filippone, H Fischer, B Fox, J Franz, S Frullani, M.-A Funk, Y Gärber, H Gao, F Garibaldi, G Gavrilov, P Geiger, V Gharibyan, A Golendukhin, G Graw, O Grebeniouk, P.W Green, L.G Greeniaus, C Grosshauser, M Guidal, A Gute, V Gyurjyan, J.P Haas, W Haeberli, J.-O Hansen, M Hartig, D Hasch, O Häusser, F.H Heinsius, R Henderson, M Henoch, R Hertenberger, Y Holler, R.J Holt, W Hoprich, H Ihssen, M Iodice, A Izotov, H.E Jackson, A Jgoun, R Kaiser, E Kinney, M Kirsch, A Kisselev, P Kitching, H Kobayashi, N Koch, K Königsmann, M Kolstein, H Kolster, V Korotkov, W Korsch, V Kozlov, L.H Kramer, V.G Krivokhijine, M Kurisuno, G Kyle, W Lachnit, P Lenisa, W Lorenzon, N.C.R Makins, F.K Martens, J.W Martin, F Masoli, A Mateos, M McAndrew, K McIlhany, R.D McKeown, F Meissner, F Menden, A Metz, N Meyners, O Mikloukho, C.A Miller, M.A Miller, R Milner, A Most, V Muccifora, R Mussa, A Nagaitsev, Yu Naryshkin, A.M Nathan, F Neunreither, J.M Niczyporuk, W.-D Nowak, M Nupieri, T.G O'Neill, R Openshaw, J Ouyang, B.R Owen, V Papavassiliou, S.F Pate, M Pitt, S Potashov, D.H Potterveld, G Rakness, A Reali, R Redwine, A.R Reolon, R Ristinen, K Rith, P Rossi, S Rudnitsky, M Ruh, D Ryckbosch, Y Sakemi, I Savin, C Scarlett, A Schäfer, F Schmidt, H Schmitt, G Schnell, K.P Schüler, A Schwind, J Seibert, T.-A Shibata, K Shibatani, T Shin, V Shutov, C Simani, A Simon, K Sinram, P Slavich, M Spengos, E Steffens, J Stenger, J Stewart, U Stoesslein, M Sutter, H Tallini, S Taroian, A Terkulov, E Thomas, B Tipton, M Tytgat, G.M Urciuoli, J.F.J van den Brand, G van der Steenhoven, R van de Vyver, J.J van Hunen, M.C Vetterli, V Vikhrov, M.G Vincter, J Visser, E Volk, W Wander, J Wendland, S.E Williamson, T Wise, K Woller, S Yoneyama, and H Zohrabian

Subjects
Physics, HERMES experiment, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Sigma, DESY, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Transverse plane, Cross section (physics), 0103 physical sciences, 010306 general physics, Scaling
Abstract

Cross section ratios for deep-inelastic scattering from 14N and 3He with respect to 2H have been measured by the HERMES experiment at DESY using a 27.5 GeV positron beam. The data cover a range in the Bjorken scaling variable x between 0.013 and 0.65, while the negative squared four-momentum transfer Q^2 varies from 0.5 to 15 GeV^2. The data are compared to measurements performed by NMC, E665, and SLAC on 4He and 12C, and are found to be different for x < 0.06 and Q^2 < 1.5 GeV^2. The observed difference is attributed to an A-dependence of the ratio R = sigma_L / sigma_T of longitudinal to transverse deep-inelastic scattering cross sections at low x and low Q^2.

Published
2000

16. Observation of a Coherence Length Effect in Exclusiveρ0Electroproduction

Author

K. Ackerstaff, A. Airapetian, N. Akopov, I. Akushevich, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, S. Barrow, C. Baumgarten, M. Beckmann, St. Belostotski, J. E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, B. Bray, St. Brons, W. Brückner, A. Brüll, E. E. W. Bruins, H. J. Bulten, R. V. Cadman, G. P. Capitani, P. Carter, P. Chumney, E. Cisbani, G. R. Court, P. F. Dalpiaz, P. P. J. Delheij, E. De Sanctis, D. De Schepper, E. Devitsin, P. K. A. de Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, J. Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B. W. Filippone, H. Fischer, H. T. Fortune, B. Fox, S. Frabetti, J. Franz, S. Frullani, M.-A. Funk, N. D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, V. Giordjian, A. Golendukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Grosshauser, M. G. Guidal, A. Gute, V. Gyurjyan, J. P. Haas, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, F. H. Heinsius, R. S. Henderson, Th. Henkes, M. Henoch, R. Hertenberger, Y. Holler, R. J. Holt, W. Hoprich, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, C. Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, V. Korotkov, W. Korsch, V. Kozlov, L. H. Kramer, B. Krause, V. G. Krivokhijine, M. Kückes, F. Kümmell, G. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N. C. R. Makins, F. K. Martens, J. W. Martin, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R. D. McKeown, F. Meissner, F. Menden, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. G. Milner, V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A. M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T. G. O'Neill, R. Openshaw, J. Ouyang, B. R. Owen, V. Papavassiliou, S. F. Pate, M. Pitt, H. R. Poolman, S. Potashov, D. H. Potterveld, B. Povh, G. Rakness, A. Reali, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, H. Roloff, G. Röper, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, C. Scarlett, F. Schmidt, H. Schmitt, G. Schnell, K. P. Schüler, A. Schwind, J. Seibert, T.-A. Shibata, T. Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, P. Slavich, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D. M. Thiessen, E. Thomas, B. Tipton, A. Trudel, M. Tytgat, G. M. Urciuoli, J. J. van Hunen, R. van de Vyver, J. F. J. van den Brand, G. van der Steenhoven, M. C. Vetterli, V. Vikhrov, M. Vincter, J. Visser, E. Volk, W. Wander, T. P. Welch, S. E. Williamson, T. Wise, T. Wölfel, K. Woller, S. Yoneyama, K. Zapfe-Düren, H. Zohrabian, and R. Zurmühle

Subjects
Physics, HERMES experiment, Particle physics, Meson, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, General Physics and Astronomy, Virtual particle, 01 natural sciences, Coherence length, Positron energy, Nuclear physics, Deuterium, Nuclear transparency, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Exclusive incoherent electroproduction of the ρ0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q^2>0.4 GeV^2 and positron energy loss ν from 9 to 20 GeV. The ratio of the 14N to 1H cross sections per nucleon, known as the nuclear transparency, was found to decrease with increasing coherence length of quark-antiquark fluctuations of the virtual photon. The data provide clear evidence of the interaction of the quark-antiquark fluctuations with the nuclear medium.

Published
1999

17. Measurement of the neutron spin structure function g with a polarized 3He internal target

Author

K. Ackerstaff, A. Airapetian, I. Akushevich, N. Akopov, M. Amarian, E.C. Aschenauer, R. Avakian, H. Avakian, A. Avetissian, B. Bains, S. Barrow, M. Beckmann, S. Belostotski, J.E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. Böttcher, A. Borissov, J. Brack, B. Braun, B. Bray, W. Brückner, A. Brüll, E.E.W. Bruins, H.J. Bulten, G.P. Capitani, P. Carter, E. Cisbani, G.R. Court, P.P.J. Delheij, E. Devitsin, C.W. de Jager, E. De Sanctis, D. De Schepper, P.K.A. de Witt Huberts, M. Düren, A. Dvoredsky, G. Elbakian, J. Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B.W. Filippone, H. Fischer, H.T. Fortune, J. Franz, S. Frullani, M.-A. Funk, N.D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, P. Geiger, V. Gharibyan, A. Golendoukhin, G. Graw, O. Grebeniouk, P.W. Green, L.G. Greeniaus, C. Grosshauser, A. Gute, V. Gyurjyan, J.P. Haas, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, R.S. Henderson, Th. Henkes, R. Hertenberger, Y. Holler, R.J. Holt, H. Ihssen, M. Iodice, A. Izotov, H.E. Jackson, A. Jgoun, C. Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, W. Korsch, V. Kozlov, L.H. Kramer, B. Krause, V.G. Krivokhijine, M. Kückes, G. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N.C.R. Makins, S.I. Manaenkov, F.K. Martens, J.W. Martin, A. Mateos, K. McIlhany, R.D. McKeown, F. Meissner, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C.A. Miller, M.A. Miller, R.G. Milner, V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A.M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T.G. O'Neill, R. Openshaw, V. Papavassiliou, S.F. Pate, M. Pitt, S. Potashov, D.H. Potterveld, B. Povh, G. Rakness, R. Redwine, A.R. Reolon, R. Ristinen, K. Rith, G. Röper, H. Roloff, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, K.P. Schüller, A. Schwind, T.-A. Shibata, T. Shin, A. Simon, K. Sinram, W.R. Smythe, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D.M. Thiessen, B. Tipton, A. Trudel, M. Tytgat, G.M. Urciuoli, R. Van de Vyver, J.F.J. van den Brand, G. van der Steenhoven, M.C. Vetterli, E. Volk, W. Wander, T.P. Welch, S.E. Williamson, T. Wise, T. Wölfel, K. Zapfe-Düren, H. Zohrabian, and R. Zurmühle

Subjects
Physics, HERMES experiment, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Astrophysics::Cosmology and Extragalactic Astrophysics, HERA, Spin structure, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Positron, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Atomic physics, 010306 general physics, Spin-½
Abstract

Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function g1n(x, Q2) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized 3He internal gas target. The data cover the kinematic range 0.023

Published
1997

18. Publisher’s Note: Precise measurement of parity violation in polarized muon decay [Phys. Rev. D84, 032005 (2011)]

Author

K. Olchanski, V. Selivanov, D. R. Gill, A. Olin, C. A. Gagliardi, G. Sheffer, A. Grossheim, R. Bayes, Glenn M. Marshall, J. Hu, M. D. Hasinoff, J. M. Poutissou, P. Gumplinger, R. Openshaw, A. Hillairet, E. L. Mathie, R. E. Tribble, Yu. I. Davydov, R. S. Henderson, R. Tacik, R. Poutissou, B. Shin, P. Depommier, R. P. MacDonald, T. D. S. Stanislaus, D. D. Koetke, W. Faszer, J. F. Bueno, A. Gaponenko, and R. E. Mischke

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Parity (physics)
Published
2012

19. Development of detection systems for low-energy heavy ions at DRAGON

Author

U. Giesen, D.A. Hutcheon, A. Chen, John D'Auria, S. Bishop, R. Openshaw, Robert Henderson, D. Hunter, C. Rolfs, A. C. Shotter, Uwe Greife, J. Rogers, S. Engel, and C. Dale

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Recoil, Proton, Inverse kinematics, Detector, Physics::Accelerator Physics, Separator (oil production), Nuclear Experiment, Beam (structure), Ion
Abstract

The new DRAGON facility at TRIUMF is designed to measure alpha and proton capture reactions with radioactive ion beams in inverse kinematics. For nucleo-synthesis in astrophysical scenarios, the relevant energies lie in the 0.15–1 MeV/u range, where very low cross sections are expected. Therefore the separation of the recoil products from the beam particles will be a difficult task. This paper focuses on the end detectors, which will be used to distinguish recoils from beam particles at the end of the DRAGON separator.

Published
2002

20. Time projection chambers for the T2K near detectors

Author

M. Ravonel, M. Boyer, F. d. M. Blaszczyk, Franck Cadoux, J. Myslik, A. Blondel, Ioannis Giomataris, P. Stamoulis, Didier Ferrere, J. Wendland, L. Monfregola, A. Gaudin, J. Giraud, G. Jover-Manas, Federico Sanchez, A. Miller, K. Laihem, A. Delbart, C. Giganti, M. Macaire, P. Colas, S. W. K. Emery, E. Delagnes, A. Sarrat, S. Herlant, J. Dumarchez, S. Roth, Jean-Marc Reymond, R. Openshaw, E. Mazzucato, E. Radicioni, Achim Stahl, M. Goyette, M. Zito, N. Abgrall, M. G. Catanesi, P. Birney, B. Andrieu, M. Mezzetto, Michael Roney, P. Bene, W. Faszer, I. Kato, D. Terront, P. Baron, J. L. Ritou, A. Vallereau, X. De La Broise, K. Hamano, J. Beucher, O. Le Dortz, A. Cervera, D. Pierrepont, M. Lenckowski, B. A. Popov, K. B. Fransham, Marco Laveder, A. Ferrero, F. Nizery, D. Calvet, A. Konaka, D. Terhorst, Robert Henderson, R. Langstaff, B. Jamieson, C. Hearty, M. Usseglio, J. Steinmann, Vincenzo Berardi, E. Monmarthe, M. Le Ross, M. Di Marco, G. Vasseur, P. Poffenberger, Thorsten Lux, D. Karlen, L. Escudero, J.-Ph. Mols, F. Druillole, G. Wikström, F. Pierre, R. Schroeter, A. Le Coguie, E. Perrin, V. Tvaskis, Kendall Mahn, C. Bojechko, M. Ieva, F. Masciocchi, Blondel, Alain, Cadoux, Franck, Di Marco, Mariagrazia, Ferrere, Didier, Ferrero, Andréa, Masciocchi, Florian, Perrin, Eric, Ravonel Salzgeber, Melody, Schroeter, Raphaël, and Wikstrom, Gustav

Subjects
Nuclear and High Energy Physics, Neutrino oscillation, Physics::Instrumentation and Detectors, ddc:500.2, Tracking (particle physics), 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, 010306 general physics, Instrumentation, Physics, Time projection chamber, 010308 nuclear & particles physics, Detector, T2K experiment, Drift chamber, Gas system, Micromegas, Neutrino oscillation, Time projection chamber, Física, MicroMegas detector, Time projectionchamber, Gas system, Charged particle, Drift chamber, High Energy Physics::Experiment, Neutrino, Micromegas
Abstract

The T2K experiment is designed to study neutrino oscillation properties by directing a high intensity neutrino beam produced at J-PARC in Tokai, Japan, towards the large Super-Kamiokande detector located 295 km away, in Kamioka, Japan. The experiment includes a sophisticated near detector complex, 280 m downstream of the neutrino production target in order to measure the properties of the neutrino beam and to better understand neutrino interactions at the energy scale below a few GeV. A key element of the near detectors is the ND280 tracker, consisting of two active scintillator–bar target systems surrounded by three large time projection chambers (TPCs) for charged particle tracking. The data collected with the tracker are used to study charged current neutrino interaction rates and kinematics prior to oscillation, in order to reduce uncertainties in the oscillation measurements by the far detector. The tracker is surrounded by the former UA1/NOMAD dipole magnet and the TPCs measure the charges, momenta, and particle types of charged particles passing through them. Novel features of the TPC design include its rectangular box layout constructed from composite panels, the use of bulk micromegas detectors for gas amplification, electronics readout based on a new ASIC, and a photoelectron calibration system. This paper describes the design and construction of the TPCs, the micromegas modules, the readout electronics, the gas handling system, and shows the performance of the TPCs as deduced from measurements with particle beams, cosmic rays, and the calibration system.

Published
2011

21. The T2K Experiment

Author

J. Ilic, Ferran Grañena, Biagio Rossi, Hiroyuki Sekiya, J. Zmuda, A. Suzuki, T. Szeglowski, Soo-Bong Kim, S. Dytman, Kendall Mahn, J. Bouchez, Masashi Yokoyama, E. Delagnes, E. Poplawska, Thorsten Lux, M. Messina, Sy Suzuki, M. Murdoch, V. Kasey, M. Gonin, S. Gomi, A. V. Waldron, P. A. Rodrigues, K. Suzuki, Y. Takeuchi, L. Escudero, Kenichi Tanaka, J. Dobson, R. Langstaff, P. Vincent, Tsuyoshi Nakaya, J. Kubota, P. Paul, S. Yen, T. Yano, S. M. Oser, J. Caravaca Rodríguez, H.A. Tanaka, Shinya Yamada, K. Briggs, Minoru Otani, J. Statter, Joshua Hignight, Yoshihiro Suzuki, D. Ruterbories, Y. Seiya, M. Khaleeq, A. Le Coguie, Achim Stahl, M. A. Ward, A. S. Tadepalli, Hiroaki Aihara, P. N. Ratoff, T. Kutter, J. Schwehr, Kimihiro Okumura, J. M. Poutissou, C. Bronner, J.P. Mols, M. Boyer, Jean-Charles Vanel, A. K. Ichikawa, S. Herlant, S. Roth, R. E. Minvielle, W. Toki, C. Yanagisawa, M. Goldhaber, M. Zito, P. Cooke, D. G. Brook-Roberge, Luigi Salvatore Esposito, Kieran P. Ramos, T. C. Nicholls, O. Araoka, Henry W. Sobel, M. Fitton, T. M. Raufer, J. Lagoda, I. Kreslo, J. Escallier, P. Mijakowski, M. M. Khabibullin, J. Blocki, Andrew Marone, K. Nishikawa, D. Morris, Joseph Muratore, J. Carroll, K. Abe, R. Sacco, A. Terashima, C. McGrew, Y. Totsuka, Susumu Takahashi, Ioannis Giomataris, Gareth J. Barker, S. Murphy, C. Ohlmann, D. Richards, Y. Shimizu, W. Metcalf, C. K. Jung, J. L. Raaf, D. Kielczewska, M. Batkiewicz, A. Dabrowska, D. Allan, N. West, I. Kato, C. Andreopoulos, G. Nagashima, S. Horikawa, T. Lindner, P. Amaudruz, Y. Obayashi, C. Densham, T. Wongjirad, L. L. Kormos, D. Ross, A. Delbart, T. Ishida, T. Boussuge, M. A. George, Toru Ogitsu, Hiroyuki Kawamuko, M. J. Wilking, K. Mizouchi, S. Chollet, S. L. Cartwright, Takaaki Kajita, G. D. Lopez, Ping Lu, Dmitriy Beznosko, Julien Schmidt, F. Retiere, P. Kitching, M. Iwasaki, C. Bojechko, J. P. Coleman, K. Hamano, Kevin Connolly, J. Steinmann, Jan T. Sobczyk, I. Mercer, T. Tsukamoto, J. Kisiel, H. G. Berns, Hidetoshi Kubo, M. Taguchi, Viktor Matveev, V. Galymov, K. Laihem, A. Zalewska, J. Gaweda, Federico Sanchez, Hirokatsu Ohhata, Y. Fukuda, D. Autiero, Norio Higashi, K. Gilje, A. Gendotti, R. G. Calland, K. Mavrokoridis, F. d. M. Blaszczyk, A. Robert, M. Noy, E. Radicioni, A. Bodek, K. Nitta, Marek Stodulski, M. O. Wascko, E. Kearns, K. Zaremba, F. Nizery, D. Naples, B. A. Popov, J. Wendland, E. L. Mathie, B. Ellison, A. Izmaylov, M. Goyette, U. Dore, A. Thorley, A. Korzenev, Atsushi Takeda, T. Maryon, J. Doornbos, M. Ieva, S. W. Sadler, R. Tacik, Alexander Finch, O. Ballester, M. Le Ross, D. L. Wark, M. Siyad, C. Matsumura, D. Payne, M. Y. Pac, Michael Roney, R. Flight, S. B. Boyd, G. Jover-Manas, A. Carver, M. Miura, T. Ozaki, T. Hasegawa, S. Mine, A. Debraine, P. Wanderer, J. J. Gomez-Cadenas, Yoshinari Hayato, T. Ishii, Kate Scholberg, M. Hartz, B. Kirby, K. Hayashi, J. L. Stone, S. Manly, J. Steffens, E. Mazzucato, G. F. Pearce, Nadeem A. Khan, P. Schaack, K. Koseki, K. Kaneyuki, S. Nakayama, Y. Kouzuma, R.P. Kurjata, S. W. Bentham, J. P. Charrier, K. Kowalik, T. Okusawa, D. Warner, W. Faszer, T. Hara, A. Sarrat, S. Short, J. P. A. M. de André, N. C. Hastings, P. Plonski, A. D. Marino, S. W. K. Emery, C. J. Malafis, A. N. Khotjantsev, M. Barbi, B. Jamieson, M. M. Tanaka, N. Kimura, S. Y. Suzuki, I. Z. Danko, A. Bravar, T. Dealtry, C. Fisher, Y. Kurimoto, P. Guzowski, Y. Fujii, M. Szeptycka, R. Poutissou, K. Ieki, M. Ikeda, W. Coleman, André Rubbia, G. Sheffer, T. Durkin, J. D. Perkin, C. Licciardi, Rituparna Das, D. Karlen, D. Smith, O. Star, K. Tashiro, J. Brinson, Koh Ueno, P. Sutcliffe, Hs Budd, I. Taylor, J. Myslik, J. F. van Schalkwyk, Katsuyu Kasami, P. Masliah, M. Vagins, V. Tvaskis, R. J. Wilkes, R. Openshaw, Michael Anerella, R. Castillo, Yuichi Oyama, F. Bay, F. Di Lodovico, M. Tada, L. Bartoszek, Masato Shiozawa, A. C. Weber, N. Tanimoto, R. P. Litchfield, E. Frank, Marco Laveder, A. Ferrero, R. A. Johnson, Omar Veledar, T. Golan, J. Giraud, B. Morgan, T. Komorowski, A. Muir, Yasuo Ajima, T. McLachlan, D. A. Forbush, Akitaka Ariga, B. Andrieu, David Calvet, A. Blondel, Iain Alexander Bertram, J. Imber, S. Moriyama, Barry L. Nelson, Robert D. Preece, Kodai Matsuoka, M. Fechner, G. Wikström, S. Bhadra, S. Assylbekov, P. F. Harrison, Fred Gannaway, M. B. Smy, Shigeki Aoki, R. Terri, Koji Yamamoto, J. Marzec, N. Braam, Frédéric Dufour, J. Holeczek, S. Giffin, T. D. J. Haycock, Michal Dziewiecki, M. Shibata, N. J. Buchanan, L. Monfregola, H. Nishino, G. P. Ward, I. T. Lim, N. Grant, P. Gumplinger, A. Hyndman, P. de Perio, Yoshikazu Yamada, A. Hatzikoutelis, N. Honkanen, L. Kellet, C. A. Miller, P. Birney, G. Collazuol, Mark Scott, T. Kikawa, R. L. Helmer, A. Minamino, Carlos A. Chavez, O. Drapier, F. Moreau, R. Hasanen, E. Monmarthe, Y. Kurosawa, L. Magaletti, C. Giganti, Oleg Mineev, D. I. Scully, C. Touramanis, X. De La Broise, Antonio Ereditato, A. Cazes, J. A. Nowak, M. Malek, N. Yershov, A. Cervera, M. Ziembicki, M. Dziomba, V. Palladino, C. Ishihara, Kevin Scott McFarland, V. Paolone, P. Poffenberger, J. Dumarchez, M. Gallop, T. Strauss, T. Maruyama, J. Zalipska, Yasuhiro Makida, L. Stawnyczy, T. Nakadaira, A. Yamamoto, G.D. Barr, P. Colas, Scott Davis, M. Rooney, J. Y. Kim, Eiichi Hirose, S. J. Ives, M. Posiadala, Takayuki Tomaru, C. Strabel, M. G. Catanesi, J. Spitz, V. Kravtsov, K. Wong, R. Sulej, C. Mark, Robert Wilson, Takahiro Okamura, J. Argyriades, A.K. Ghosh, E. Rondio, P. Dinh Tran, J. Beucher, N. McCauley, K. K. Joo, T. Wachala, D. Terhorst, P. Stamoulis, A. Gaudin, W. Qian, C. J. Pearson, G. Kogan, J. Swierblewski, G. De Rosa, R. A. Owen, A. Badertscher, M. Macaire, Y. Takenaga, A. Konaka, J. Kameda, P. Przewlocki, Yusuke Koshio, B. E. Berger, Lester D.R. Thompson, F. Druillole, Ken Sakashita, M. Mezzetto, C. Angelsen, Antonin Vacheret, W. R. Kropp, M. Cadabeschi, J. F. Martin, M. Tzanov, C. J. Metelko, H. Kakuno, R. Bradford, Leonid Kurchaninov, J. R. Wilson, K. Sasaki, M. Bryant, D. Pierrepont, A. Murakami, Yu. Kudenko, D. Bishop, S. Sooriyakumaran, M. Usseglio, Justin Albert, N. Kulkarni, N. Abgrall, S. Greenwood, C. Hearty, Suyong Choi, Alastair Grant, Richard J.H. Smith, G. Mituka, M. Thorpe, F. Pierre, Yutaka Yamanoi, Hiroshi Yamaoka, A. Marchionni, R. A. Wendell, Vincenzo Berardi, Ewart W. Blackmore, P. T. Le, T. Kobayashi, S. Di Luise, A. Curioni, Tomoko Ariga, P. Baron, J. L. Ritou, S. Koike, M. Lenckowski, G. Vasseur, B. Still, M. Pfleger, K. B. Fransham, Masashi Tanaka, C. Hansen, T. B. Lawson, K. Iyogi, E. D. Zimmerman, Tomiyoshi Haruyama, K. P. Lee, M. Day, Robert Henderson, A. Longhin, J. Marteau, Z. Williamson, M. Iida, H. Kaji, Katsuki Hiraide, K. Olchanski, M. Ravonel, Michel Raymond, G. Christodoulou, K. Nakamura, B. Hartfiel, Leigh H. Whitehead, Masayuki Nakahata, Y. Uchida, T. Sekiguchi, Tatsushi Nakamoto, M. Besnier, G. Ganetis, Gavin Davies, L. Ludovici, C. Cavata, M. Sorel, S. Hastings, M. D. Haigh, C. W. Walter, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), T2K, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), K., Abe, N., Abgrall, H., Aihara, DE ROSA, Gianfranca, Palladino, Vittorio, Département d'Electronique, des Détecteurs et d'Informatique (ex SEDI) (DEDI), Abgrall, Nicolas, Argyriades, Jeremy, Blondel, Alain, Bravar, Alessandro, Dufour, Fanny, Ferrero, Andréa, Haesler, Alexis, Korzenev, Alexander, Murphy, Sébastien, Ravonel Salzgeber, Melody, and Wikstrom, Gustav

Subjects
Nuclear and High Energy Physics, Particle physics, Sterile neutrino, Physics - Instrumentation and Detectors, Neutrino oscillation, Physics::Instrumentation and Detectors, ddc:500.2, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Long baseline, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Neutrinos, 010306 general physics, physics.ins-det, Instrumentation, QC, Physics, T2K, hep-ex, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, T2K experiment, J-PARC, Super-Kamiokande, Física, Neutrino detector, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

The T2K experiment is a long-baseline neutrino oscillation experiment. Its main goal is to measure the last unknown lepton sector mixing angle {\theta}_{13} by observing {\nu}_e appearance in a {\nu}_{\mu} beam. It also aims to make a precision measurement of the known oscillation parameters, {\Delta}m^{2}_{23} and sin^{2} 2{\theta}_{23}, via {\nu}_{\mu} disappearance studies. Other goals of the experiment include various neutrino cross section measurements and sterile neutrino searches. The experiment uses an intense proton beam generated by the J-PARC accelerator in Tokai, Japan, and is composed of a neutrino beamline, a near detector complex (ND280), and a far detector (Super-Kamiokande) located 295 km away from J-PARC. This paper provides a comprehensive review of the instrumentation aspect of the T2K experiment and a summary of the vital information for each subsystem., Comment: 33 pages, 32 figures, Submitted and accepted by NIM A. Editor: Prof. Chang Kee Jung, Department of Physics and Astronomy, SUNY Stony Brook, chang.jung@sunysb.edu, 631-632-8108 Submit Edited to remove line numbers

Published
2011

22. Drift chambers for a precision measurement of the Michel parameters in muon decay

Author

V. Torokhov, P. Gumplinger, N. L. Rodning, R. Tacik, R. L. Helmer, E. L. Mathie, M. A. Vasiliev, J. Schaapman, V. Selivanov, L.V Miassoedov, M. A. Quraan, G. Price, R. E. Tribble, M. Comyn, P.W. Green, J. M. Poutissou, A. Olin, E. Korkmaz, D. Maas, D. D. Koetke, R. Openshaw, D.F. Ottewell, D. R. Gill, R. Poutissou, R. Manweiler, Yu. Yu. Lachin, C. A. Gagliardi, P. M. Nord, F. Sobratee, G. M. Stinson, G. Sheffer, Glenn M. Marshall, T. A. Porcelli, Robert Henderson, J. Soukup, J. A. Macdonald, H. C. Walter, J.C. Hardy, P. Depommier, W. Faszer, R. MacDonald, D.H. Wright, T. D. S. Stanislaus, P. Kitching, J. R. Musser, Yu. I. Davydov, A. Khruchinsky, W. Andersson, J. Doornbos, B. Shin, and M. D. Hasinoff

Subjects
Physics, Nuclear and High Energy Physics, Muon, Physics::Instrumentation and Detectors, Flat glass, Cathode, Anode, law.invention, Nuclear physics, Planar, law, visual_art, visual_art.visual_art_medium, Physics::Accelerator Physics, Michel parameters, Ceramic, Instrumentation, Beam (structure)
Abstract

Planar drift chambers will be used in a solenoidal magnetic field to measure the Michel parameters in muon decay. The chamber manufacture procedure uses flat glass tables and precise ceramic glass spacers to provide precise anode– cathode spacing. Results of bench and beam tests of the prototype chambers are discussed. # 2001 Elsevier Science B.V. All rights reserved.

Published
2001

23. Experimental constraints on left-right symmetric models from muon decay

Author

K. Olchanski, Glenn M. Marshall, J. M. Poutissou, W. Faszer, G. Sheffer, R.S. Henderson, R. Openshaw, R. Bayes, Yu. I. Davydov, M. D. Hasinoff, R. Poutissou, R. E. Tribble, A. Grossheim, A. Hillairet, J. Hu, C. A. Gagliardi, D. R. Gill, P. Depommier, R. Tacik, P. Gumplinger, A. Olin, E. L. Mathie, A. Gaponenko, T. D. S. Stanislaus, R. P. MacDonald, D. D. Koetke, R. E. Mischke, V. Selivanov, B. Shin, and J. F. Bueno

Subjects
Physics, Nuclear physics, Particle physics, Antiparticle, Muon, Antimatter, General Physics and Astronomy, Grand Unified Theory, High Energy Physics::Experiment, Elementary particle, Twist, Standard Model, Lepton
Abstract

The TWIST Collaboration has completed a new measurement of the energy-angle spectrum of positrons from the decay of highly polarized muons. A simultaneous measurement of the muon decay parameters {rho}, {delta}, and P{sub {mu}}{sup {pi}{xi}} tests the standard model in a purely leptonic process and provides improved limits for relevant extensions to the standard model. Specifically, for the generalized left-right symmetric model |(g{sub R}/g{sub L}){zeta}| 578 GeV/c{sup 2}, both 90% C.L.

Published
2010

24. Decay of negative muons bound inAl27

Author

P. Gumplinger, G. Sheffer, Glenn M. Marshall, J. M. Poutissou, R. E. Tribble, K. Olchanski, T. D. S. Stanislaus, R. Openshaw, A. Olin, B. Shin, M. D. Hasinoff, J. Hu, R. Poutissou, C. A. Gagliardi, E. L. Mathie, J. F. Bueno, R. S. Henderson, D. D. Koetke, A. Grossheim, R. Tacik, M. C. Fujiwara, R. E. Mischke, V. Selivanov, D. R. Gill, P. Depommier, A. Hillairet, R. Bayes, and W. Faszer

Subjects
Physics, Nuclear and High Energy Physics, Muon, 010308 nuclear & particles physics, media_common.quotation_subject, Spectrum (functional analysis), Electron, 01 natural sciences, Asymmetry, Nuclear physics, Momentum, Particle decay, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, Twist, Atomic physics, 010306 general physics, media_common
Abstract

We present the first measurement of the energy spectrum up to 70 MeV of electrons from the decay of negative muons after they become bound in $^{27}\mathrm{Al}$ atoms. The data were taken with the TWIST apparatus at TRIUMF. We find a muon lifetime of $(864.6\ifmmode\pm\else\textpm\fi{}1.2)\text{ }\text{ }\mathrm{ns}$, in agreement with earlier measurements. The asymmetry of the decay spectrum is consistent with zero, indicating that the atomic capture has completely depolarized the muons. The measured momentum spectrum is in reasonable agreement with theoretical predictions at the higher energies, but differences around the peak of the spectrum indicate the need for $\mathcal{O}(\ensuremath{\alpha})$ radiative corrections to the calculations. The present measurement is the most precise measurement of the decay spectrum of muons bound to any nucleus.

Published
2009

25. Precision measurement of the muon decay parametersρandδ

Author

E. L. Mathie, A. Gaponenko, A. Grossheim, B. Jamieson, V. Selivanov, D. D. Koetke, R. Tacik, R. Bayes, P. Depommier, M. Nozar, R. E. Tribble, P. Kitching, B. Shin, W. Faszer, A. Olin, R. P. MacDonald, T. D. S. Stanislaus, G. Sheffer, M. D. Hasinoff, A. Hillairet, J. F. Bueno, R. E. Mischke, M. C. Fujiwara, R.S. Henderson, R. Openshaw, J. R. Musser, K. Olchanski, Yu. I. Davydov, M. A. Quraan, P. Gumplinger, R. Poutissou, C. A. Gagliardi, D. R. Gill, J. Hu, Glenn M. Marshall, and J. M. Poutissou

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, 010308 nuclear & particles physics, media_common.quotation_subject, Polarization (waves), 01 natural sciences, Asymmetry, Spectral line, Nuclear physics, Particle decay, Pion, 0103 physical sciences, High Energy Physics::Experiment, Twist, 010306 general physics, media_common
Abstract

The TWIST Collaboration has performed new measurements of two of the parameters that describe muon decay: {rho}, which governs the shape of the overall momentum spectrum, and {delta}, which governs the momentum dependence of the parity-violating decay asymmetry. This analysis gives the results {rho}=0.750 14{+-}0.000 17(stat){+-}0.000 44(syst){+-}0.000 11({eta}), where the last uncertainty arises from the correlation between {rho} and the decay parameter {eta}, and {delta}=0.750 67{+-}0.000 30(stat){+-}0.000 67(syst). These are consistent with the value of 3/4 given for both parameters in the standard model of particle physics, and are a factor of two more precise than the measurements previously published by TWIST. A new global analysis of all available muon decay data incorporating these results is presented. Improved lower and upper limits on the decay parameter P{sub {mu}}{sup {pi}}{xi} of 0.995 24

Published
2008

26. Measurement of the Two-Halo Neutron Transfer ReactionH1(Li11,Li9)H3at3A MeV

Author

A. C. Shotter, W. J. Mills, G. Ruprecht, M. Caamaño, R. Openshaw, M. Alcorta, D. Bandyopadhyay, W. Mittig, G. Sheffer, S. Mythili, Guy Savard, Barry Davids, M. Trinczek, M. Notani, Elizabeth Padilla-Rodal, D. Howell, R. Bieri, Aaron Gallant, L. Buchmann, T. Roger, Isao Tanihata, Ian J. Thompson, N. Galinski, P.L. Walden, P. Roussel-Chomaz, H. Savajols, and R. Kanungo

Subjects
Nuclear reaction, Physics, 010308 nuclear & particles physics, Scattering, Isotopes of lithium, Cyclotron, Hadron, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, law, Excited state, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The p({sup 11}Li,{sup 9}Li)t reaction has been studied for the first time at an incident energy of 3A MeV at the new ISAC-2 facility at TRIUMF. An active target detector MAYA, built at GANIL, was used for the measurement. The differential cross sections have been determined for transitions to the {sup 9}Li ground and first excited states in a wide range of scattering angles. Multistep transfer calculations using different {sup 11}Li model wave functions show that wave functions with strong correlations between the halo neutrons are the most successful in reproducing the observation.

Published
2008

27. Time expansion chamber system for characterization of TWIST low energy muon beams

Author

R. Openshaw, K. Olchanski, P. Gumplinger, A. Olin, V. Selivanov, G. Sheffer, D. R. Gill, B. Jamieson, R.S. Henderson, Yu. I. Davydov, Glenn M. Marshall, C. Lindsay, and J. Hu

Subjects
Physics, Nuclear and High Energy Physics, Muon, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Expansion chamber, TEC, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Stability (probability), Nuclear physics, Position (vector), 0103 physical sciences, Calibration, Twist, 010306 general physics, Instrumentation, Beam (structure)
Abstract

A low mass time expansion chamber (TEC) has been developed to measure distributions of position and angle of the TRIUMF low energy surface muon beam used for the TWIST experiment. The experiment is a high precision measurement of muon decay and is dominated by systematic uncertainties, including the stability, reproducibility, and characterization of the beam. The distributions measured by two TEC modules are one essential ingredient of an accurate simulation of TWIST. The uncertainties, which are extracted through comparisons of data and simulation, must be known to assess potential systematic uncertainties of the TWIST results. The design criteria, construction, alignment, calibration, and operation of the TEC system are discussed, including experiences from initial beam studies. A brief description of the use of TEC data in the TWIST simulation is also included., v. 2, with corrections and revised figures. 23 pages, 16 figures, accepted for publication in Nuclear Inst. and Methods in Physics Research, A

Published
2006

28. Measurement of the muon decay parameterδ

Author

R. E. Mischke, R. E. Tribble, P. W. Green, R. Poutissou, M. A. Vasiliev, A. Gaponenko, K. Olchanski, P. M. Nord, F. Sobratee, V. D. Torokhov, V. Selivanov, T. A. Porcelli, E. L. Mathie, A. A. Krushinsky, R. P. MacDonald, W. Faszer, M. C. Fujiwara, D. D. Koetke, Yu. Yu. Lachin, P. Kitching, B. Shin, R. Bayes, M. D. Hasinoff, R. Tacik, R.S. Henderson, A. Olin, M. Nozar, J. R. Musser, G. Sheffer, Yu. I. Davydov, N. L. Rodning, T. D. S. Stanislaus, J. Doornbos, D. R. Gill, J. Hu, P. Depommier, C. A. Gagliardi, M. A. Quraan, J. A. Macdonald, Glenn M. Marshall, J. M. Poutissou, P. Gumplinger, R. Openshaw, L. V. Miasoedov, D. H. Wright, and B. Jamieson

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Particle decay, Muon, Pion, High Energy Physics::Experiment, Twist
Abstract

The muon decay parameter {delta} has been measured by the TWIST collaboration. We find {delta}=0.74964{+-}0.00066(stat.){+-}0.00112(syst.), consistent with the standard model value of 3/4. This result implies that the product P{sub {mu}}{xi} of the muon polarization in pion decay, P{sub {mu}}, and the muon decay parameter {xi} falls within the 90% confidence interval 0.9960

Published
2005

29. Precision planar drift chambers and cradle for the TWIST muon decay spectrometer

Author

R. Openshaw, J. Schaapman, L. V. Miasoedov, R.S. Henderson, D. D. Koetke, Yu. I. Davydov, W. Faszer, G. Sheffer, M. A. Quraan, T. D. S. Stanislaus, V. Selivanov, and V. Torokhov

Subjects
Physics, Nuclear and High Energy Physics, Muon, Physics - Instrumentation and Detectors, Spectrometer, Physics::Instrumentation and Detectors, Detector, Measure (physics), FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Weak interaction, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Planar, Position (vector), High Energy Physics::Experiment, Twist, Nuclear Experiment (nucl-ex), Instrumentation, Nuclear Experiment
Abstract

To measure the muon decay parameters with high accuracy, we require an array of precision drift detector layers whose relative position is known with very high accuracy. This article describes the design, construction and performance of these detectors in the TWIST (TRIUMF Weak Interaction Symmetry Test) spectrometer., 44 pages, 16 Postscript figures, LaTeX2e, uses Elsevier class elsart.cls, package graphicx, submitted to Nuclear Instruments & Methods in Physics Research

Published
2004

30. MTV-G experiment : probing a non-standard strong gravitational field at nuclear scale using geodetic precession

Author

R. Openshaw, Matthew Pearson, J. Onishi, Y. Nakaya, Saki Tanaka, Y. Totsuka, K. Ninomiya, J. Murata, and Hironori Nishio

Subjects
Nuclear physics, Physics, History, Thomas precession, Gravitational field, T-symmetry, Scattering, Large extra dimension, Electron, Spin (physics), Geodetic effect, Computer Science Applications, Education
Abstract

The MTV-G project has started in 2011 to explore a strong gravitational field around nuclei utilizing an experimental technique developed to search time reversal symmetry violation in nuclear beta decay experiment at a radioactive beam facility. A large electron spin-precession due to a possible strong gravitational field, which has been predicted by a large extra dimension model, is investigated in an electron-nuclear scattering experiment at TRIUMF. The experimental design, which use a spin polarized electron source and a Mott-spin analyzer, the commissioning experiment, the preliminary results, together with an introduction to the next generation device, are described in this article.

Published
2013

31. Electron Transverse Polarimeter for the MTV experiment at TRIUMF

Author

K. Ninomiya, Hirokazu Kawamura, Y. Nakaya, R. Openshaw, Y. Totsuka, N. Ogawa, T. Toyoda, E. Seitaibashi, J. Onishi, J. Murata, M. Ikeda, M. R. Pearson, R. Kishi, M. Uchida, and H. Baba

Subjects
Physics, History, business.industry, Scattering, Detector, Polarimetry, Polarimeter, Electron, Mott scattering, Polarization (waves), Computer Science Applications, Education, Nuclear physics, Optics, Data acquisition, business
Abstract

A new experimental project called MTV(Mott Polarimetry for T-Violation Experiment)-S1183 has started at TRIUMF, aiming to achieve the highest precision test of time reversal symmetry in polarized nuclear beta decay. In this experiment, existence of T-violating transverse polarization of electrons emitted from polarized nuclei is examined, using a multi-wire drift chamber (MWDC) as an electron tracking detector in order to measure Mott scattering asymmetries. In this paper, technical aspects of the electron polarimetry are described. The Mott polarimeter, MWDC, consists of six sense layers. In order to improve the real backward scattering event purity, a new intelligent triggering system using FPGA module to perform on-line hit pattern recognition was developed. The new triggering system was installed for the first commissioning experiment in November 2009 at TRIUMF-ISAC. In addition to the triggering system, a new buffering DAQ system was also developed in order to achieve the needed high triggering rate at ISAC. Details of their performance are also described.

Published
2011

32. Test of Time Reversal Symmetry using polarized8Li at TRIUMF-ISAC

Author

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

Subjects
Quark, Nuclear physics, Physics, History, Scattering, Physics beyond the Standard Model, Polarimetry, Electron, Mott scattering, Polarization (waves), Triple correlation, Computer Science Applications, Education
Abstract

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.

Published
2011

33. TACTIC – Ion tracking in nuclear physics

Author

R. Openshaw, Pierre-Andre Amaudruz, A. C. Shotter, Alison Laird, Götz Ruprecht, S. P. Fox, P.L. Walden, U. Hager, M. Walter, L. Buchmann, L. Martin, Kelly Chipps, P. Machule, and P. Bruskiewich

Subjects
Physics, Nuclear reaction, History, Neutron emission, Nuclear Theory, Detector, Tracking (particle physics), Charged particle, Computer Science Applications, Education, Nuclear physics, Massless particle, Neutrino, Nuclear Experiment, Lepton
Abstract

Ion tracking is still an unusual detection method in nuclear physics. TACTIC (TRIUMF annular chamber for tracking and identification of charged particles) is suitable for tracking low-energy ejectiles. The cylindrical design allows for an electrical separation of target and drift region without hindering the ejectiles to enter the drift region. The first experiment with radioactive beam – the reaction 8Li(α,n)11B which is important for the α-process in neutrino-driven supernova winds – took place in June '09. Since no off-the-shelf analysis tools and methods are available for this kind of tracking, TRIUMF's TACTIC group developed graphical tool for analysing data that can also be used for other modern nuclear physics detectors.

Published
2010

34. A selection of detector R&D at TRIUMF

Author

M. Salomon, W. Faszer, R. Openshaw, and R. S. Henderson

Subjects
Nuclear physics, High rate, Physics, Scintillating fiber, Neutrino detector, Ionization, Detector, Neutrino, Particle detector, Anode
Abstract

At TRIUMF we have an ongoing program of detector R&D. For example, small interelectrode very high rate MWPCs have been developed and are now routinely used in secondary channels at TRIUMF. In a related area the characteristics of ageing in a variety of gas mixtures have been intensely studied, with the remarkable performance of CF4/Isobutane (80:20) discovered. Indeed we have found that an ionization exposure of 0.5 Coulombs per cm of wire in this mixture will reverse existing anode wire damage in single‐wire chambers. TRIUMF is also designing a large volume (2×2×6 m) scintillating fiber detector. Consisting of 1.2×107 1 mm fibers, this detector will meet the requirements for many of the neutrino experiments proposed for the TRIUMF/KAON facility.

Published
1992

35. Measurement of Longitudinal Spin Transfer to Lambda Hyperons in Deep Inelastic Lepton Scattering

Author

Th. Benisch, H. E. Jackson, V. G. Krivokhijine, A. Nagaitsev, S. Bernreuther, T. A. Shibata, Haiyan Gao, C. Baumgarten, M. Amarian, B. Braun, Michel Vetterli, F. Menden, S. Brauksiepe, Andrey V. Izotov, R.O. Avakian, Evaristo Cisbani, G. Rakness, E. Devitsin, V. A. Kozlov, W.-D. Nowak, N. Akopov, A. Metz, Ralf Kaiser, M. Guidal, A. Reali, Valeria Muccifora, A.O. Mateos, B. D. Fox, A. R. Reolon, A. Avetissian, W. Lachnit, A. Airapetian, G. S. Kyle, V. A. Korotkov, M. Iodice, E. Steffens, M. Henoch, A. Kisselev, A. Borissov, Robert Henderson, M. Kurisuno, M. Sutter, G. M. Urciuoli, A. Simon, G. Gavrilov, M. Düren, R. D. McKeown, P. Geiger, R. J. Holt, G. P. Capitani, J. van Hunen, Klaus Rith, M. Kolstein, M. Ruh, Adel Terkulov, F. Masoli, J. Visser, A. Dvoredsky, L. G. Greeniaus, S. Yoneyama, R. Mussa, Wolfgang Lorenzon, B. Tipton, F. Neunreither, P. Carter, R. Openshaw, B. R. Owen, E. De Sanctis, C. Scarlett, H. Schmitt, H. Avakian, Y. Gärber, U. Stosslein, Y. Holler, Michael Tytgat, S. Taroian, P. Rossi, Salvatore Frullani, E. E. W. Bruins, A. Fechtchenko, B. Bray, Franco Garibaldi, P. F. Dalpiaz, K. Königsmann, R. P. Redwine, E. Thomas, Michael Pitt, A. Brüll, C. A. Miller, G. Schnell, W. Wander, J. Ely, A. Jgoun, G. Elbakian, A. Gute, W. Brückner, S. E. Williamson, S. Belostotski, P.K.A. de Witt Huberts, P. Kitching, Ross Milner, H. Kolster, O. Grebeniouk, S. I. Manaenkov, Alessandra Fantoni, T. Shin, M. Nupieri, G. van der Steenhoven, G. Graw, A. Golendukhin, H. J. Bulten, Alan M. Nathan, F.H. Heinsius, P. Chumney, E. C. Aschenauer, E. R. Kinney, V. Shutov, V. Vikhrov, B. Bains, L. H. Kramer, Wolfgang Korsch, Y. Naryshkin, C. Simani, Naomi C R Makins, F. Meissner, V. Gyurjyan, Manuella Vincter, M.-A. Funk, E. Volk, Ralf Hertenberger, H. Ihssen, J. P. Haas, A. Schwind, Hiroaki Kobayashi, K. Fiedler, K. Shibatani, K. Woller, M. Spengos, J. Franz, K. McIlhany, I.A. Savin, P.W. Green, G.R. Court, M. McAndrew, H. Tallini, J. W. Martin, S. Rudnitsky, Dirk Ryckbosch, Thomas O'Neill, K. P. Schüler, N. Koch, Nicola Bianchi, O. Mikloukho, S. Potashov, H. Zohrabian, M. Kirsch, P. Di Nezza, M. A. Miller, C. Grosshauser, R. A. Ristinen, J. M. Niczyporuk, N. Meyners, J.-O. Hansen, M. Ferstl, M. Bouwhuis, H. Böttcher, S. F. Pate, V. Papavassiliou, R. Van de Vyver, P. Slavich, Jeffrey Brack, J. Stenger, J. E. Belz, J. Stewart, W. Haeberli, P. Lenisa, J. Seibert, J. Wendland, D. Hasch, B. W. Filippone, J. Blouw, D. H. Potterveld, W. Hoprich, H. Fischer, O. Häusser, D. De Schepper, K. Sinram, T. Wise, V. Gharibyan, F. Schmidt, M. Beckmann, J. F. J. van den Brand, Yasuhiro Sakemi, Jinsong Ouyang, M. Hartig, S. Brons, F. K. Martens, and (Astro)-Particles Physics

Subjects
Photon, HERMES, (p pi-) [mass spectrum], PROTON, 01 natural sciences, polarization [up], High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 27.5 GeV, angular distribution, deep inelastic scattering [positron p], STRUCTURE-FUNCTION G(1)(P), NUCLEON, Nuclear Experiment, Physics, BARYONS, Spin polarization, HERA, Helicity, DESY HERA Stor, polarization [Lambda], +p+pi%22">Lambda --> p pi, Quark, fragmentation [up], Nuclear and High Energy Physics, Particle physics, electroproduction [Lambda], MUON SCATTERING, FOS: Physical sciences, Nuclear physics, ASYMMETRIES, 0103 physical sciences, ddc:530, SDG 7 - Affordable and Clean Energy, 010306 general physics, Z-DECAYS, quark model parton, 010308 nuclear & particles physics, Hyperon, (LAMBDA)OVER-BAR POLARIZATION, Deep inelastic scattering, conservation law [helicity], DEUTERON, High Energy Physics::Experiment, polarized beam [positron], +Lambda%22">positron p --> Lambda, POLARIZED QUARK DISTRIBUTIONS, Lepton, experimental results
Abstract

Spin transfer in deep-inelastic Lambda electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the HERA storage ring. For an average fractional energy transfer = 0.45, the longitudinal spin transfer from the virtual photon to the Lambda has been extracted. The spin transfer along the Lambda momentum direction is found to be 0.11 +/- 0.17 (stat) +/- 0.03 (sys); similar values are found for other possible choices for the longitudinal spin direction of the Lambda. This result is the most precise value obtained to date from deep-inelastic scattering with charged lepton beams, and is sensitive to polarized up quark fragmentation to hyperon states. The experimental result is found to be in general agreement with various models of the Lambda spin content, and is consistent with the assumption of helicity conservation in the fragmentation process., Comment: 8 pages, 3 figures; new version has an expanded discussion and small format changes

Published
2001

36. A precision measurement of muon decay

Author

R. E. Tribble, M. Comyn, V. Torokhov, R. Tacik, T. D. S. Stanislaus, J. Schaapman, D. D. Koetke, R. Manweiler, R. MacDonald, P. Gumplinger, G. Sheffer, W. Faszer, P.W. Green, R. Poutissou, A. Olin, J. R. Musser, Yu. I. Davydov, H. K. Walter, G. M. Stinson, R. Openshaw, M. A. Quraan, A. Khruchinsky, D.H. Wright, M. D. Hasinoff, E. Korkmaz, Robert Henderson, T. A. Porcelli, D.F. Ottewell, D. R. Gill, M. A. Vasiliev, V. Selivanov, J.C. Hardy, J. Doornbos, D. Mass, W. Andersson, Glenn M. Marshall, C. A. Gagliardi, T. Mathie, P. Depommier, N. L. Rodning, P. Kitching, A. Gaponenko, Y.M. Shin, G. Price, J. M. Poutissou, P. M. Nord, F. Sobratee, J. Soukup, and J. A. Macdonald

Subjects
Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, Muon, Astronomy and Astrophysics, Weak interaction, Atomic and Molecular Physics, and Optics, Nuclear physics, Symmetry test, Positron, Michel parameters, High Energy Physics::Experiment, Large deviations theory, Twist
Abstract

The (V-A) structure of the weak interaction was put into the standard model by hand in order to obtain agreement with experiments. These experiments, however, do not rule out relatively large deviations from this structure. Muon decay provides an ideal laboratory to test this structure, being a purely leptonic process. The TRIUMF Weak Interaction Symmetry Test (TWIST) will measure both the energy and emission-angle distribution of positrons from the decay of polarized muons. This will provide a simultaneous determination of the Michel parameters Pμξ, ρ and δ describing muon decay with a precision of a few parts in 104. Stringent limits may then be placed on the coupling constants, as well as the mass and mixing angle of a possible right-handed W boson (WR). In this paper the formalism for muon decay is presented, TWIST is described, and the expected results are discussed.

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