Abstract
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→dπ+ reaction at 1930.477 MeV/c incident beam momentum, the forward going pions (θc.m. = 0°) and the backward going deuterons (θc.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 θlab = 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.
Original language | English |
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Pages (from-to) | 249-253 |
Number of pages | 5 |
Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
Volume | 426 |
Issue number | 2 |
DOIs | |
State | Published - May 1 1999 |
Externally published | Yes |
Funding
We wish to thank the COSY accelerator team for their effort to provide a good beam for this experiment. One of the authors (HN) wants to thank the Institut für Kernphysik of the Forschungszentrum Jülich for the kind hospitality during his sabbatical stay. The work was supported by BMBF Germany (06 MS 568 I TP4), Internationales Büro des BMBF (X081.24 and 211.6), SCSR Poland (2P302 025 and 2P03B 88 08), NSF Bulgaria (414), NATO scientific affairs, and COSY Jülich.
Funders | Funder number |
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Internationales Büro des BMBF | X081.24, 211.6 |
SCSR | 2P302 025, 2P03B 88 08 |
National Science Foundation | 414 |
North Atlantic Treaty Organization | |
Bundesministerium für Bildung und Forschung |