| Autor: |
B. J. Lieb, R. Jahn, A. Magiera, D. Kolev, R. Tsenov, D. Protic, P. A. Zolnierczuk, T. Kutsarova, K. Kilian, A. Hamacher, R. Siudak, M. Hawash, A. Chatterjee, L. Freindl, A. Budzanowski, W. Garske, H. Nann, M. Drochner, K. Zwoll, R. Maier, J. Bojowald, H.S. Plendl, G. Lippert, S. V. Förtsch, B.R. Roy, M.G. Betigeri, D. Frekers, G. Kemmerling, A. Strzałkowski, I. Ilieva, J. Ernst, K. Grewer, Hartmut Machner, S. Igel, W. Klimala, B. Razen, L. Jarczyk, Jerzy Smyrski, P. von Rossen, S. Kliczewski |
| Rok vydání: |
1999 |
| Předmět: |
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| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 426:249-253 |
| ISSN: |
0168-9002 |
| DOI: |
10.1016/s0168-9002(99)00014-5 |
| Popis: |
We present a method to determine precisely the absolute momentum of the external proton beam from the Julich Cooler Synchrotron COSY near 1930 MeV /c . In the pp → d π + reaction at 1930.477 MeV /c incident beam momentum, the forward going pions ( θ c.m. =0° ) and the backward going deuterons ( θ c.m. =180° ) have the same laboratory momentum. Such coincident pion–deuteron events are detected in the focal plane of the magnetic spectrometer BIG KARL located at θ lab =0° . Using the nearly linear dependence of the difference between the measured pion and deuteron momenta as a function of the proton beam momentum, the absolute momentum of the external proton beam from COSY near 1930 MeV /c was determined with a precision of 5.2×10 −5 . |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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