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Now showing items 1 - 11 of 11

  • Foreign Exchange Handbookby S. Bell; B. Kettell

    Review by: Anna Guglielmetti  

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  • High purity pion beam at TRIUMF

    Aguilar-Arevalo, A.   Blecher, M.   Bryman, D. A.   Comfort, J.   Doornbos, J.   Doria, L.   Hussein, A.   Ito, N.   Kettell, S.   Kurchaninov, L.   Malbrunot, C.   Marshall, G. M.   Numao, T.   Poutissou, R.   Sher, A.   Walker, B.   Yamada, K.  

    An extension of the TRIUMF M13 low-energy pion channel designed to suppress positrons based on an energy-loss technique is described. A source of beam channel momentum calibration from the decay pi(+) -> e(+) v is also described. (C) 2009 Elsevier B.V. All rights reserved.
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  • Study of a large NaI(Tl) crystal

    Aguilar-Arevalo, A.   Aoki, M.   Blecher, M.   Bryman, D. A.   Doria, L.   Gumplinger, P.   Hussein, A.   Ito, N.   Kettell, S.   Kurchaninov, L.   Littenberg, L.   Malbrunot, C.   Marshall, G. M.   Numao, T.   Poutissou, R.   Sher, A.   Yamada, K.  

    Using a narrow band positron beam, the response of a large high-resolution NaI(Tl) crystal to an incident positron beam was measured. It was found that nuclear interactions cause the appearance of additional peaks in the low energy tail of the deposited energy spectrum. (C) 2010 Elsevier B.V. All rights reserved.
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  • The PIENU experiment at TRIUMF: a sensitive probe for new physics

    Malbrunot, Chloe   Aguilar-Arevalo, A. A.   Aoki, M.   Blecher, M.   Britton, D. I.   Bryman, D. A.   Chen, S.   Comfort, J.   Ding, M.   Doornbos, J.   Doria, L.   Gumplinger, P.   Hurst, C.   Hussein, A.   Igarashi, Y.   Ito, N.   Kettell, S.   Kuno, Y.   Kurchaninov, L.   Littenberg, L.   Numao, T.   Poutissou, R.   Sher, A.   Sullivan, T.   Vavilov, D.   Yamada, K.   Yoshida, M.  

    Study of rare decays is an important approach for exploring physics beyond the Standard Model (SM). The branching ratio of the helicity suppressed pion decays, R = Gamma(pi(+) -> e(+)v(c)+pi(+)-> e(+)v(c)gamma/Gamma(pi(+) ->mu(+) v(mu)+pi+-> v(mu)gamma), is one of the most accurately calculated decay process involving hadrons and has so far provided the most stringent test of the hypothesis of electron-muon universality in weak interactions. The branching ratio has been calculated in the SM to better than 0.01% accuracy to be R(SM) = 1.2353(1) x 10(4). The PIENU experiment at TRIUMF, which started taking physics data in September 2009, aims to reach an accuracy five times better than the previous experiments, so as to confront the theoretical calculation at the level of +/- 0.1%. If a deviation from the R(SM) is found, "new physics" beyond the SM, at potentially very high mass scales (up to 1000 TeV), could be revealed. Alternatively, sensitive constraints on hypotheses can be obtained for interactions involving pseudoscalar or scalar interactions. So far, 4 million pi(+) -> e(+)v(e) events have been accumulated by PIENU. This paper will outline the physics motivations, describe the apparatus and techniques designed to achieve high precision and present the latest results.
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  • PIENU experiment at TRIUMF: A sensitive probe of new physics

    Sher, A.   Aguilar-Arevalo, A.   Aoki, M.   Blecher, M.   Britton, D. I.   Bryman, D. A.   von Bruch, D.   Chen, S.   Comfort, J.   Ding, M.   Doria, L.   Gumplinger, P.   Hussein, A.   Igarashi, Y.   Ito, N.   Ito, S.   Kettell, S.   Kuno, Y.   Kurchaninov, L.   Littenberg, L.   Malbrunot, C.   Mischke, R.   Numao, T.   Sandorfi, A.   Sullivan, T.   Vavilov, D.   Yamada, K.   Yoshida, Y.  

    A TRIUMF experiment, PIENU, which aims to measure the branching ratio of pion decays, R = Gamma( pi -> e nu + e nu gamma)/ Gamma(pi -> mu nu + mu nu gamma) to a precision of 0.1% or better is described. Such a measurement provides the best test of electron- muon universality in weak interactions and is sensitive to an effective mass scale of up to 1000 TeV in new physics.
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  • Circuits of Capital and Overproduction: A Marxist Analysis of the Present World Economic Crisis

    Kettell, S.  

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  • Background radiation measurements at high power research reactors

    Ashenfelter, J.   Balantekin, B.   Baldenegro, C. X.   Band, H. R.   Barclay, G.   Bass, C. D.   Berish, D.   Bowden, N. S.   Bryan, C. D.   Cherwinka, J. J.   Chu, R.   Classen, T.   Davee, D.   Dean, D.   Deichert, G.   Dolinski, M. J.   Dolph, J.   Dwyer, D. A.   Fan, S.   Gaison, J. K.   Galindo-Uribarri, A.   Gilje, K.   Glenn, A.   Green, M.   Han, K.   Hans, S.   Heeger, K. M.   Heffron, B.   Jaffe, D. E.   Kettell, S.   Langford, T. J.   Littlejohn, B. R.   Martinez, D.   McKeown, R. D.   Morrell, S.   Mueller, P. E.   Mumm, H. P.   Napolitano, J.   Norcini, D.   Pushin, D.   Romero, E.   Rosero, R.   Saldana, L.   Seilhan, B. S.   Sharma, R.   Stemen, N. T.   Surukuchi, P. T.   Thompson, S. J.   Varner, R. L.   Wang, W.   Watson, S. M.   White, B.   White, C.   Wilhelmi, J.   Williams, C.   Wise, T.   Yao, H.   Yeh, M.   Yen, Y. -R.   Zhang, C.   Zhang, X.  

    Research reactors host a wide range of activities that make use of the intense neutron fluxes generated at these facilities. Recent interest in performing measurements with relatively low event rates, e.g. reactor antineutrino detection, at these facilities necessitates a detailed understanding of background radiation fields. Both reactor-correlated and naturally occurring background sources are potentially important, even at levels well below those of importance for typical activities. Here we describe a comprehensive series of background assessments at three high-power research reactors, including gamma-ray, neutron, and muon measurements. For each facility we describe the characteristics and identify the sources of the background fields encountered. The general understanding gained of background production mechanisms and their relationship to facility features will prove valuable for the planning of any sensitive measurement conducted therein. (C) 2015 Elsevier B.V. All rights reserved.
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  • The Political Economy of Open-Source Software in the United Kingdom

    Kettell, S.  

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  • Foreign Exchange Handbookby S. Bell; B. Kettell

    Review by: Anna Guglielmetti  

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  • A Cherenkov counter designed as a muon trigger for the SDC detector

    Albee, M.   Baranko, G.   Broomer, B.   Christoph, M.   Daoudi, M.   Erdos, E.   Nauenberg, U.   Schultz, G.   Smathers, J.   Van Egeren, Q.   Wente, C.   Belz, J.   Daniel, G.   Guss, C.   Kettell, S.   McFarlane, K.   Johns, K.   Koehn, P.  

    A test of a gas Cherenkov counter was performed at Fermilab in the High Energy Muon Lab in order to understand its performance as a trigger counter for muons above a given momentum. This counter was built so that it could rotate relative to the beam direction to simulate the bending of muon tracks in the toroidal magnet of the Solenoidal Detector Collaboration (SDC) being designed for use at the Superconducting Super Collider (SSC). The SDC Cherenkov counter is so designed that a high momentum muon would emit Cherenkov light that is focussed on the face of a photomultiplier tube while a low momentum muon in the forward element of the SDC detector is bent to large enough angles so that the light is focussed away from the photomultiplier tube. The authors present the observed changes in pulse height as the counter is rotated and the simulated resultant trigger efficiency for a given photomultiplier output pulse
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  • Status of the PIENU experiment

    Numao, T.   Aguilar-Arevalo, A.   Aoki, M.   Blecher, M.   Britton, D. I.   Bryman, D. A.   vom Bruch, D.   Chen, S.   Comfort, J.   Cuen-Rochin, S.   Doria, L.   Gumplinger, P.   Hussein, A.   Igarashi, Y.   Ito, S.   Kettell, S.   Kurchaninov, L.   Littenberg, L.   Malbrunot, C.   Mischke, R.   Protopopescu, D.   Sher, A.   Sullivan, T.   Vavilov, D.  

    The branching ratio, R-e/mu = Gamma(pi -> e nu + e nu gamma)/Gamma(pi -> mu nu + mu nu gamma), provides a sensitive test of muon-electron universality in weak interactions. The status of the PIENU experiment at TRIUMF, which aims to improve the precision of the R-e/mu measurement by a factor of > 5, is presented.
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