K
K. Zapfe
Researcher at Max Planck Society
Publications - 10
Citations - 420
K. Zapfe is an academic researcher from Max Planck Society. The author has contributed to research in topics: Hydrogen & Hyperfine structure. The author has an hindex of 6, co-authored 10 publications receiving 413 citations.
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Journal ArticleDOI
Flavor decomposition of the polarized quark distributions in the nucleon from inclusive and semi-inclusive deep-inelastic scattering
K. Ackerstaff,A. Airapetian,N. Akopov,Igor Akushevich,M. Amarian,E.C. Aschenauer,H. Avakian,R.O. Avakian,A. Avetissian,B. Bains,S. Barrow,C. Baumgarten,M. Beckmann,S. Belostotski,J. E. Belz,J. E. Belz,Th. Benisch,S. Bernreuther,Nicola Bianchi,Sean Blanchard,J. Blouw,H. Böttcher,A. Borissov,Jeffrey Brack,B. Bray,S. Brauksiepe,B. Braun,B. Braun,S. Brons,W. Brückner,A. Brull,E. E. W. Bruins,H. J. Bulten,H. J. Bulten,R. V. Cadman,G. P. Capitani,P. Carter,P. Chumney,Evaristo Cisbani,G.R. Court,P. F. Dalpiaz,R. De Leo,P. P. J. Delheij,E. De Sanctis,D. De Schepper,D. De Schepper,E. Devitsin,P.K.A. de Witt Huberts,P. Di Nezza,M. Düren,A. Dvoredsky,J. Ely,G. Elbakian,Joseph Emerson,Joseph Emerson,Alessandra Fantoni,A. Fechtchenko,M. Ferstl,D. Fick,K. Fiedler,B. W. Filippone,H. Fischer,H. T. Fortune,B. D. Fox,S. Frabetti,J. Franz,S. Frullani,M.-A. Funk,N.D. Gagunashvili,P. Galumian,Haiyan Gao,Haiyan Gao,Haiyan Gao,Y. Gärber,Franco Garibaldi,G. Gavrilov,P. Geiger,V. Gharibyan,A. Golendukhin,G. Graw,O. Grebeniouk,P.W. Green,P.W. Green,L. G. Greeniaus,L. G. Greeniaus,C. Grosshauser,M. Guidal,A. Gute,V. Gyurjyan,J. P. Haas,W. Haeberli,J.-O. Hansen,D. Hasch,O. Häusser,O. Häusser,Robert Henderson,F.H. Heinsius,Th. Henkes,M. Henoch,Ralf Hertenberger,Y. Holler,R. J. Holt,W. Hoprich,H. Ihssen,M. Iodice,A. Izotov,H. E. Jackson,A. Jgoun,C. E. Jones,Ralf Kaiser,Ralf Kaiser,M. Kestel,E. R. Kinney,M. Kirsch,A. Kisselev,P. Kitching,Hiroaki Kobayashi,N. Koch,K. Königsmann,M. Kolstein,H. Kolster,V. Korotkov,Wolfgang Korsch,Wolfgang Korsch,V. A. Kozlov,L. H. Kramer,L. H. Kramer,B. Krause,V. G. Krivokhijine,M. Kückes,F. Kümmell,M. Kurisuno,G. S. Kyle,W. Lachnit,Wolfgang Lorenzon,Wolfgang Lorenzon,A. Lung,Naomi C R Makins,Naomi C R Makins,F. K. Martens,J. W. Martin,H. Marukyan,F. Masoli,A.O. Mateos,M. Maul,M. McAndrew,K. McIlhany,K. McIlhany,R. D. McKeown,F. Meissner,F. Menden,F. Menden,D. Mercer,A. Metz,N. Meyners,O. Mikloukho,C. A. Miller,C. A. Miller,M. A. Miller,Ross Milner,Valeri Valentinovitch Mitsyn,R. Mozzetti,Valeria Muccifora,A. Nagaitsev,E. Nappi,Y. Naryshkin,Alan M. Nathan,F. Neunreither,J. M. Niczyporuk,J. M. Niczyporuk,W.-D. Nowak,M. Nupieri,P. Oelwein,H. Ogami,Thomas O'Neill,R. Openshaw,B. R. Owen,Jinsong Ouyang,V. Papavassiliou,S. F. Pate,S. F. Pate,Michael Pitt,H. R. Poolman,S. Potashov,D. H. Potterveld,G. Rakness,A. Reali,R. P. Redwine,A. R. Reolon,R. A. Ristinen,Klaus Rith,G. Röper,P. Rossi,S. Rudnitsky,S. Rudnitsky,M. Ruh,Dirk Ryckbosch,Yasuhiro Sakemi,I.A. Savin,C. Scarlett,Andreas 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,A. Simon,K. Sinram,P. Slavich,W.R. Smythe,J. Sowinski,M. Spengos,E. Steffens,J. Stenger,J. Stewart,F. Stock,F. Stock,U. Stoesslein,M. Sutter,H. Tallini,S. Taroian,Adel Terkulov,D.M. Thiessen,D.M. Thiessen,B. Tipton,E. Thomas,A. Trudel,Michael Tytgat,G. M. Urciuoli,J. van Hunen,R. Van de Vyver,J. F. J. van den Brand,G. van der Steenhoven,Michel Vetterli,Michel Vetterli,V. Vikhrov,Manuella Vincter,J. Visser,E. Volk,W. Wander,W. Wander,T. P. Welch,J. Wendland,J. Wendland,S. E. Williamson,T. Wise,K. Woller,S. Yoneyama,K. Zapfe,H. Zohrabian,R. Zurmühle +257 more
TL;DR: In this article, the first moments of the polarized quark distributions were compared to predictions based on SU(3)f flavor symmetry and to a prediction from lattice QCD.
Journal ArticleDOI
The HERA polarimeter and the first observation of electron spin polarization at HERA
D. P. Barber,H.-D. Bremer,M. Böge,R. Brinkmann,W. Brückner,Ch. Büscher,M.S. Chapman,K. J. Coulter,P.P.J. Delheij,M. Düren,E. Gianfelice-Wendt,P.W. Green,H.G. Gaul,H. Gressmann,O. Hausser,O. Hausser,R. Henderson,T. Janke,H. Kaiser,Ralf Kaiser,P. Kitching,Robert Klanner,P. Levy,H.-Ch. Lewin,M. Lomperski,Wolfgang Lorenzon,L. Losev,R. D. McKeown,N. Meyners,B. Micheel,Ross Milner,A. Mücklich,F. Neunreither,W.-D. Nowak,P. M. Patel,K. Rith,Ch. Scholz,E. Steffens,M. Veltri,M. Vetterli,M. Vetterli,W. Vogel,W. Wander,D. Westphal,K. Zapfe,F. Zetsche +45 more
TL;DR: In this paper, the polarimeter, the machine conditions, the data analysis, the first results and plans for future measurements are described, as well as the polarization values close to 60% have been achieved.
Journal ArticleDOI
New method to polarize protons in a storage ring and implications to polarize antiprotons
Frank Rathmann,C. Montag,D. Fick,J. Tonhäuser,W. Brückner,H.G. Gaul,Manfred Grieser,Bogdan Povh,M. Rall,E. Steffens,F. Stock,K. Zapfe,B. Braun,G. Graw,W. Haeberli +14 more
TL;DR: A feasibility test of a new method to polarize beams of strongly interacting charged particles circulating in a storage ring is described, and the polarization buildup is clearly demonstrated.
Journal ArticleDOI
The FILTEX/HERMES polarized hydrogen atomic beam source
F. Stock,Klaus Rith,H.G. Gaul,B. Lorentz,H. Mairon,Bogdan Povh,E. Steffens,D. Toporkov,K. Zapfe,Frank Rathmann,D. Fick,W. Korsch,G. Graw,K. Reinmuller,P. Schiemenz,W. Haeberli +15 more
TL;DR: The FILTEX/HERMES atomic beam source (ABS) for polarized hydrogen is described in this article, where the beam forming system and the sextupole magnet system are optimized.
Journal ArticleDOI
Detailed studies of a high-density polarized hydrogen gas target for storage rings
K. Zapfe,W. Brückner,H.G. Gaul,Manfred Grieser,Minn-Tsong Lin,Z. Moroz,Bogdan Povh,M. Rall,B. Stechert,E. Steffens,J. Stenger,F. Stock,J. Tonhäuser,Ch. Montag,Frank Rathmann,D. Fick,B. Braun,G. Graw,W. Haeberli +18 more
TL;DR: In this article, a high-density target of polarized atomic hydrogen gas for applications in storage rings was produced by injecting atoms from an atomic beam source into a T-shaped storage cell.