Phys. Rev. Lett.
82,
1164–1168
(1999)
Beam-Induced Nuclear Depolarization in a Gaseous Polarized-Hydrogen Target
K. Ackerstaff et al. (The HERMES Collaboration)
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K. Ackerstaff5, A. Airapetian32, N. Akopov32, M. Amarian32,27, E. C. Aschenauer13,14, H. Avakian10, R. Avakian32, A. Avetissian32, B. Bains15, C. Baumgarten23, M. Beckmann12, St. Belostotski26, J. E. Belz28,29, Th. Benisch8, S. Bernreuther8, N. Bianchi10, J. Blouw25, H. Böttcher6, A. Borissov6,14, J. Brack4, S. Brauksiepe12, B. Braun8, B. Bray3, St. Brons6, W. Brückner14, A. Brüll14, E. E. W. Bruins20, H. J. Bulten18,25,31, R. V. Cadman15, G. P. Capitani10, P. Carter3, P. Chumney24, E. Cisbani27, G. R. Court17, P. F. Dalpiaz9, E. De Sanctis10, D. De Schepper20, E. Devitsin22, P. K. A. de Witt Huberts25, P. Di Nezza10, M. Düren8, A. Dvoredsky3, G. Elbakian32, A. Fantoni10, A. Fechtchenko7, M. Ferstl8, D. Fick19, K. Fiedler8, B. W. Filippone3, H. Fischer12, B. Fox4, J. Franz12, S. Frabetti9, S. Frullani27, M.-A. Funk5, N. D. Gagunashvili7, H. Gao2,15, Y. Gärber6, F. Garibaldi27, G. Gavrilov26, P. Geiger14, V. Gharibyan32, V. Giordjian10, A. Golendukhin19,32, G. Graw23, O. Grebeniouk26, P. W. Green1,29, L. G. Greeniaus1,29, C. Grosshauser8, A. Gute8, W. Haeberli18, J.-O. Hansen2, D. Hasch6, O. Häusser28,29,*, R. Henderson29, Th. Henkes25, M. Henoch8, R. Hertenberger23, Y. Holler5, R. J. Holt15, W. Hoprich14, H. Ihssen5,25, M. Iodice27, A. Izotov26, H. E. Jackson2, A. Jgoun26, R. Kaiser28,29, E. Kinney4, A. Kisselev26, P. Kitching1, H. Kobayashi30, N. Koch19, K. Königsmann12, M. Kolstein25, H. Kolster23, V. Korotkov6, W. Korsch3,16, V. Kozlov22, L. H. Kramer20,11, V. G. Krivokhijine7, G. Kyle24, W. Lachnit8, W. Lorenzon21, N. C. R. Makins2,15, S. I. Manaenkov26, F. K. Martens1, J. W. Martin20, F. Masoli9, A. Mateos20, M. McAndrew17, K. McIlhany3, R. D. McKeown3, F. Meissner6, A. Metz23, N. Meyners5, O. Mikloukho26, C. A. Miller1,29, M. A. Miller15, R. Milner20, V. Mitsyn7, A. Most15,21, R. Mozzetti10, V. Muccifora10, A. Nagaitsev7, Y. Naryshkin26, A. M. Nathan15, F. Neunreither8, M. Niczyporuk20, W.-D. Nowak6, M. Nupieri10, H. Ogami30, T. G. O'Neill2, B. R. Owen15, V. Papavassiliou24, S. F. Pate20,24, M. Pitt3, S. Potashov22, D. H. Potterveld2, G. Rakness4, A. Reali9, R. Redwine20, A. R. Reolon10, R. Ristinen4, K. Rith8, H. Roloff6, P. Rossi10, S. Rudnitsky21, M. Ruh12, D. Ryckbosch13, Y. Sakemi30, I. Savin7, F. Schmidt8, H. Schmitt12, G. Schnell24, K. P. Schüler5, A. Schwind6, T.-A. Shibata30, T. Shin20, V. Shutov7, C. Simani9, A. Simon12, K. Sinram5, P. Slavich9,10, J. Sowinski14, M. Spengos5, E. Steffens8, J. Stenger8, J. Stewart17, F. Stock8, U. Stoesslein6, M. Sutter20, H. Tallini17, S. Taroian32, A. Terkulov22, B. Tipton20, M. Tytgat13, G. M. Urciuoli27, J. J. van Hunen25, R. van de Vyver13, J. F. J. van den Brand25,31, G. van der Steenhoven25, M. C. Vetterli28,29, M. Vincter29, E. Volk14, W. Wander8, S. E. Williamson15, T. Wise18, K. Woller5, S. Yoneyama30, K. Zapfe-Düren5, and H. Zohrabian32 (The HERMES Collaboration)
1Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2N2
2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
3W. K. Kellog Radiation Lab, California Institute of Technology, Pasadena, California 91125
4Nuclear Physics Laboratory, University of Colorado, Boulder, Colorado 80309-0446
5DESY, Deutsches Elektronen Synchrotron, 22603 Hamburg, Germany
6DESY, 15738 Zeuthen, Germany
7Joint Institute for Nuclear Research, 141980 Dubna, Russia
8Physikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
9Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, Italy
10Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
11Department of Physics, Florida International University, Miami, Florida 33199
12Fakultaet fuer Physik, Universität Freiburg, 79104 Freiburg, Germany
13Department of Subatomic and Radiation Physics, University of Gent, 9000 Gent, Belgium
14Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany
15Department of Physics, University of Illinois, Urbana, Illinois 61801
16Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
17Physics Department, University of Liverpool, Liverpool L69 7ZE, United Kingdom
18Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706
19Physikalisches Institut, Philipps-Universität Marburg, 35037 Marburg, Germany
20Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
21Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120
22Lebedev Physical Institute, 117924 Moscow, Russia
23Sektion Physik, Universität München, 85748 Garching, Germany
24Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003
25Nationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The Netherlands
26Petersburg Nuclear Physics Institute, St. Petersburg, 188350 Russia
27Istituto Nazionale di Fisica Nucleare, Sezione Sanita, 00161 Roma, Italy
28Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
29TRIUMF, Vancouver, British Columbia, Canada V6T 2A3
30Tokyo Institute of Technology, Tokyo 152, Japan
31Department of Physics and Astronomy, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands
32Yerevan Physics Institute, 375036, Yerevan, Armenia
Received 4 June 1998; published in the issue dated 8 February 1999
Spin-polarized atomic hydrogen is used as a gaseous polarized-proton target in high-energy and nuclear-physics experiments operating with internal beams in storage rings. When such beams are intense and bunched, this type of target can be depolarized by a resonant interaction with the transient magnetic field generated by the beam bunches. This effect has been studied with the HERA positron beam in the HERMES experiment at DESY. Resonances have been observed and a simple analytic model has been used to explain their shape and position. Operating conditions for the experiment have been found where there is no significant target depolarization due to this effect.
© 1999 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.1164
DOI:
10.1103/PhysRevLett.82.1164
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