The NPDGamma Experiment. Chad Gillis (Prof. Shelley Page)
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1 The NPDGamma Exerimet Chad Gillis (Prof. Shelley Page)
2 NPDGamma at LANSCE d + + γ (2.2 MeV) Pulsed (20 Hz) roto beam strikes roductio target 800 MeV Liac The NPDGamma Reactio Cold (mev) eutros from LH moderator 2 The NPDGamma Exerimet.1/16
3 Defiitio of the Asymmetry Measure the arity-violatig correlatio betwee eutro si directio ad gamma mometum directio. = agle from eutro si directio. = robability for gamma release i directio θ. + d γ directio robability The NPDGamma Exerimet.2/16
4 Measuremet of the Asymmetry Observe how gamma rate arallel to eutro si deeds o the eutro orietatio. GAMMA DETECTORS CsI LH 2 To iterret this we eed to kow the eutro olarizatio. The NPDGamma Exerimet.3/16
5 Measuremet of the Asymmetry Observe how gamma rate arallel to eutro si deeds o the eutro orietatio. GAMMA DETECTORS CsI LH 2 To iterret this we eed to kow the eutro olarizatio. The NPDGamma Exerimet.4/16
6 Measuremet of the Asymmetry Observe how gamma rate arallel to eutro si deeds o the eutro orietatio. GAMMA DETECTORS CsI LH 2 To iterret this we eed to kow the eutro olarizatio. The NPDGamma Exerimet.5/16
7 Measuremet of the Asymmetry Observe how gamma rate arallel to eutro si deeds o the eutro orietatio. GAMMA DETECTORS CsI LH 2 To iterret this we eed to kow the eutro olarizatio. The NPDGamma Exerimet.6/16
8 The NPDGamma Aaratus Helmholtz coils rovide uiform vertical magetic field. eutro 20 Hz beam olarizer beam PULSED moitor moitor NEUTRONS NEUTRON GUIDE 3 3 SPIN He He He FLIPPER gamma detectors LH 2 TARGET beam moitor 3 He 3 The NPDGamma Exerimet.7/16
9 The Beam Moitors Helmholtz coils rovide uiform vertical magetic field. eutro 20 Hz beam olarizer beam PULSED moitor moitor NEUTRONS NEUTRON GUIDE 3 3 SPIN He He He FLIPPER gamma detectors LH 2 TARGET beam moitor 3 He 3 + io chambers. + kietic eergy Well-kow cross sectio with simle eergy deedece. The NPDGamma Exerimet.8/16
10 A Beam Moitor Sigal ream outut (volts/ulse) bragg scatterig from Alumium i flight ath frame overla choer sweeig through beam tof (ms) at 21 meters The NPDGamma Exerimet.9/16
11 The Polarizer Helmholtz coils rovide uiform vertical magetic field. eutro 20 Hz beam olarizer beam PULSED moitor moitor NEUTRONS NEUTRON GUIDE 3 3 SPIN He He He FLIPPER gamma detectors LH 2 TARGET beam moitor 3 He 3 The NPDGamma Exerimet.10/16
12 + He reactio The NPDGamma Exerimet.11/16 bars eutro eergy E (ev)
13 + He reactio 3 He σ ~ 3 bars 3 He σ a ~ 17, mev (v = eutro seed) σ α 1/v a Moitor 3 He Cell Moitor Neutro Beam The NPDGamma Exerimet.12/16
14 Beam Polarimetry Aalysis Helmholtz coils rovide uiform vertical magetic field. eutro 20 Hz beam olarizer beam PULSED moitor moitor NEUTRONS NEUTRON GUIDE 3 3 SPIN He He He FLIPPER gamma detectors LH 2 TARGET beam moitor 3 He 3 : uolarized trasmissio : olarized trasmissio The NPDGamma Exerimet.13/16
15 Beam Polarimetry Aalysis Sigal From Beam Moitor 2 ream outut (volts/ulse) uolarized olarized tof (ms) at 21 meters The NPDGamma Exerimet.14/16
16 Beam Polarimetry Aalysis eutro olarizatio Beam Polarizatio Calculatio beam moitor data fit to tah( σ P ) tof (ms) at 21 meters The NPDGamma Exerimet.15/16
17 The NPDGamma Collaboratio TRIUMF J.D. Bowma (Sokeserso), G.S. Mitchell, S.I. Pettilä, W.S. Wilbur ad V.W. Yua Los Alamos Natioal Laboratory W. Che, M. Leuscher, B. Lozowski, J. Mei, H. Na, S. Satra ad W.M. Sow Idiaa Uiversity M. Gericke, R.C. Gillis, S.A. Page ad W.D. Ramsay Uiversity of Maitoba ad TRIUMF T.E. Chu ad M. Kades Uiversity of Michiga M. Dabaghya, F.W. Hersma ad H. Zhu Uiversity of New Hamshire D. Desai, G.L. Greee, T. Ito, R. Mahuri ad A. Yue Uiversity of Teessee ad ORNL R.D. Carlii Thomas Jefferso Natioal Accelerator Facility S.J. Freedma ad B. Lauss Uiversity of Califoria, Berkeley T.B. Smith Uiversity of Dayto G.L. Joes Hamilto College E.I. Sharaov Joit Istitute for Nuclear Research, Duba T. Io, Y. Masuda ad S. Muto High Eergy Accelerator Research Orgaizatio, Jaa P.-N. Seo North Carolia State Uiversity W. Che ad T.R. Getile Natioal Istitute of Stadards ad Techology The NPDGamma Exerimet.16/16
Pulsed Cold Neutron Beam Polarimetry for the. NPDGamma Experiment. U of Manitoba Subatomic Physics Club November 2004
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The NPDGamma Experiment
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