New method for a continuous determination of the spin tune in storage rings and implications for precision experiments

Autor: Eversmann, D., Hejny, V., Hinder, F., Kacharava, A., Pretz, J., Rathmann, F., Rosenthal, M., Trinkel, F., Andrianov, S., Augustyniak, W., Bagdasarian, Z., Bai, M., Bernreuther, W., Bertelli, S., Berz, M., Bsaisou, J., Chekmenev, S., Chiladze, D., Ciullo, G., Contalbrigo, M., de Vries, J., Dymov, S., Engels, R., Esser, F. M., Felden, O., Gaisser, M., Gebel, R., Glückler, H., Goldenbaum, F., Grigoryev, K., Grzonka, D., Guidoboni, G., Hanhart, C., Heberling, D., Hempelmann, N., Hetzel, J., Hipple, R., Hölscher, D., Ivanov, A., Kamerdzhiev, V., Kamys, B., Keshelashvili, I., Khoukaz, A., Koop, I., Krause, H-J., Krewald, S., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Maier, R., Makino, K., Marianski, B., Mchedlishvili, D., Meißner, Ulf-G., Mey, S., Nass, A., Natour, G., Nikolaev, N., Nioradze, M., Nogga, A., Nowakowski, K., Pesce, A., Prasuhn, D., Ritman, J., Rudy, Z., Saleev, A., Semertzidis, Y., Senichev, Y., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Statera, M., Stephenson, E., Stockhorst, H., Straatmann, H., Ströher, H., Tabidze, M., Talman, R., Engblom, P. Thörngren, Trzcinski, A., Uzikov, Yu., Valdau, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wilkin, C., Wirzba, A., Wronska, A., Wüstner, P., Zakrzewska, M., Zaplatin, E., Zupranski, P., Zyuzin, D.

A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, the spin tune - defined as the number of spin precessions per turn - is given by $\nu_s = \gamma G$ (gamma is the Lorentz factor, $G$ the magnetic anom

Externí odkaz: http://arxiv.org/abs/1504.00635

Measurement of the analysing power in proton-proton elastic scattering at small angles

Autor: Bagdasarian, Z., Chiladze, D., Dymov, S., Kacharava, A., Macharashvili, G., Barsov, S., Gebel, R., Gou, B., Hartmann, M., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Maier, R., Mchedlishvili, D., Merzliakov, S., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Shmakova, V., Stassen, R., Stockhorst, H., Strakovsky, I. I., Ströher, H., Tabidze, M., Täschner, A., Trusov, S., Tsirkov, D., Uzikov, Yu., Valdau, Yu., Wilkin, C., Workman, R. L.

The proton analysing power in $\vec{p}p$ elastic scattering has been measured at small angles at COSY-ANKE at 796 MeV and five other beam energies between 1.6 and 2.4 GeV using a polarised proton beam. The asymmetries obtained by detecting the fast p

Externí odkaz: http://arxiv.org/abs/1409.8445

Toward polarized antiprotons: Machine development for spin-filtering experiments

Autor: Weidemann, C., Rathmann, F., Stein, H. J., Lorentz, B., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Chiladze, D., Ciullo, G., Contalbrigo, M., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Kamerdzhiev, V., Khoukaz, A., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Macharashvili, G., Maier, R., Martin, S., Mchedlishvili, D., Meyer, H. O., Merzliakov, S., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N. N., Oellers, D., Papenbrock, M., Pesce, A., Prasuhn, D., Retzlaff, M., Schleichert, R., Schröer, D., Seyfarth, H., Soltner, H., Statera, M., Steffens, E., Stockhorst, H., Ströher, H., Tabidze, M., Tagliente, G., Engblom, P. Thörngren, Trusov, S., Valdau, Yu., Vasiliev, A., Wüstner, P.

Publikováno v: Phys. Rev. ST Accel. Beams 18, 020101 (2015)

The paper describes the commissioning of the experimental equipment and the machine studies required for the first spin-filtering experiment with protons at a beam kinetic energy of $49.3\,$MeV in COSY. The implementation of a low-$\beta$ insertion m

Externí odkaz: http://arxiv.org/abs/1407.6724

Absence of spin dependence in the final state interaction of the d(pol) p --> 3He eta reaction

Autor: Papenbrock, M., Barsov, S., Burmeister, I., Chiladze, D., Dymov, S., Fritzsch, C., Gebel, R., Goslawski, P., Hartmann, M., Kacharava, A., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lorentz, B., Mchedlishvili, D., Mersmann, T., Merzliakov, S., Mielke, M., Mikirtychiants, S., Ohm, H., Prasuhn, D., Rathmann, F., Rausmann, T., Serdyuk, V., Ströher, H., Täschner, A., Trusov, S., Valdau, Y., Wilkin, C.

The deuteron tensor analysing power t_{20} of the d(pol) p --> 3He eta reaction has been measured at the COSY-ANKE facility in small steps in excess energy Q up to Q = 11 MeV. Despite the square of the production amplitude varying by over a factor of

Externí odkaz: http://arxiv.org/abs/1404.5425

First measurements of spin correlations in the np -> d pi^0 reaction

Autor: Shmakova, V., Mchedlishvili, D., Dymov, S., Azaryan, T., Barsov, S., Chiladze, D., Engels, R., Gebel, R., Gou, B., Grigoryev, K., Hartmann, M., Kacharava, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mikirtytchiants, M., Mikirtytchiants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Yu., Valdau, Yu., Wilkin, C.

The transverse spin correlations Axx and Ayy in the np-> d pi^0 reaction have been measured for the first time in quasi-free kinematics at the COSY-ANKE facility using a polarised deuteron beam incident on a polarised hydrogen cell target. The result

Externí odkaz: http://arxiv.org/abs/1307.4950