# OLYMP

 2017-06-1912:23 [PUBDB-2017-05437] Journal Article et al Composite bottlebrush mechanics: ?-internexin fine-tunes neurofilament network properties Soft matter 11(29), 5839 - 5849 (2015) [10.1039/C5SM00662G]   Neuronal cytoplasmic intermediate filaments are principal structural and mechanical elements of the axon. Their expression during embryonic development follows a differential pattern, while their unregulated expression is correlated to neurodegenerative diseases. [...] OpenAccess: PDF PDF (PDFA); 2016-11-2414:11 [PUBDB-2016-05585] Preprint/Report et al Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment [DESY-16-217; arXiv:1611.04685]   The OLYMPUS collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, $\it R_{2 \gamma}$, a direct measure of the contribution of hard two-photon exchange to the elastic cross section. In the OLYMPUS measurement, 2.01 GeV electron and positron beams were directed through a hydrogen gas target internal to the DORIS storage ring at DESY. [...] OpenAccess: 2016_paper Physical review letters - PDF PDF (PDFA); 1611.04685v1(1) - PDF PDF (PDFA); External link: Fulltext 2016-11-2411:53 [PUBDB-2016-05579] Report/Journal Article et al Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment [DESY-16-217; arXiv:1611.04685] Physical review letters 118(9), 092501 (2017) [10.1103/PhysRevLett.118.092501]   The OLYMPUS collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, $\it R_{2 \gamma}$, a direct measure of the contribution of hard two-photon exchange to the elastic cross section. In the OLYMPUS measurement, 2.01 GeV electron and positron beams were directed through a hydrogen gas target internal to the DORIS storage ring at DESY [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2016-08-1116:12 [PUBDB-2016-02987] Journal Article Kohl, M. The OLYMPUS Experiment at DESY INTERNATIONAL WORKSHOP ON POSITRONS AT JEFFERSON LAB, JPOS09, Meeting locationNewport News (Virginia), US, 25 Mar 2009 - 27 Mar 2009 AIP conference proceedings 1160, 19 (2009) [10.1063/1.3232027]   Recent determinations of the proton electric to magnetic elastic form factor ratio from polarization transfer measurements at Jefferson Lab indicate an unexpected and dramatic discrepancy with the elastic form factor ratio obtained using the Rosenbluth separation technique in unpolarized cross section measurements. This discrepancy has been explained as the effect of two-photon exchange beyond the usual one-photon exchange approximation in the calculation of the elastic electron-proton scattering cross section. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2016-08-1115:37 [PUBDB-2016-02983] Journal Article/Contribution to a conference proceedings Kohl, M. EM Form Factors and OLYMPUS 13th International Workshop on Meson Production, Properties and Interaction, MESON2014, Meeting locationKRAKÓW, Poland, 29 May 2014 - 3 Jun 2014   The elastic form factors of the nucleon characterize the distributions of charge and magnetization in momentum space and are important input for calculations of strong interaction phenomena and nuclear structure. The dramatic discrepancy in the observed ratio of elastic proton form factors between the Rosenbluth separation and polarization transfer methods has invoked numerous theoretical and experimental investigations. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2016-08-1115:20 [PUBDB-2016-02981] Journal Article et al The OLYMPUS Internal Hydrogen Target An internal hydrogen target system was developed for the OLYMPUS experiment at DESY, in Hamburg, Germany. The target consisted of a long, thin-walled, tubular cell within an aluminum scattering chamber. [...] OpenAccess: PDF PDF (PDFA); Restricted: PDF PDF (PDFA); External link: Fulltext 2016-08-1114:56 [PUBDB-2016-02977] Journal Article et al Measurement and tricubic interpolation of the magnetic field for the OLYMPUS experiment   The OLYMPUS experiment used a 0.3T toroidal magnetic spectrometer to measure the momenta of outgoing charged particles. In order to accurately determine particle trajectories, knowledge of the magnetic field was needed throughout the spectrometer volume. [...] OpenAccess: PDF PDF (PDFA); Restricted: PDF PDF (PDFA); External link: Fulltext 2016-08-1114:21 [PUBDB-2016-02975] Journal Article et al Design and Performance of a Lead Fluoride Detector as a Luminosity Monitor   Precise luminosity measurements for the OLYMPUS two-photon exchange experiment at DESY were performed by counting scattering events with alternating beams of electrons and positrons incident on atomic electrons in a gaseous hydrogen target. Final products of M$\phi$ller, Bhabha, and pair annihilation interactions were observed using a pair of lead fluoride ($PbF_{2}$) Cherenkov calorimeters with custom housings and electronics, adapted from a system used by the A4 parity violation experiment at MAMI. [...] Published on 2016-04-20. Available in OpenAccess from 2017-04-20.: PDF; Restricted: PDF PDF (PDFA); External link: Fulltext 2016-08-1114:02 [PUBDB-2016-02974] Conference Presentation Schmidt, A. OLYMPUS Lepton-Nucleus Scattering XIV, ELBA XIV, Meeting locationIsola d'Elba, MIT, Italy, 27 Jun 2016 - 1 Jul 2016 OpenAccess: PDF PDF (PDFA); External link: Fulltext 2016-08-1113:54 [PUBDB-2016-02972] Poster Kohl, M. The OLYMPUS Experiment at DESY International conference on Precision Physics of Simple Atomic Systems, PSAS'2016, Meeting locationJerusalem, Israel, 22 May 2016 - 27 May 2016 OpenAccess: PDF PDF (PDFA); External link: Fulltext