Description: First results from subthreshold k+ -production measurements with ANKE

This title appears in the Scientific Report : 2000

First results from subthreshold k+ -production measurements with ANKE

The new spectrometer ANKE has been put into operation at the accelerator COSY of the Forschungszentrum Julich. An initial scientific goal is to study K+-production in pA collisions at subthreshold energies below the free NN-threshold of T = 1.58 GeV. First measurements of double differential cross s...

Personal Name(s):	Barsov, S.
	Bechstedt, U. / Borchert, G. / Borgs, W. / Büscher, M. / Debowski, M. / Erven, W. / Eßer, R. / Fedorets, P. / Gotta, D. / Hartmann, M. / Junghans, H. / Kacharava, A. / Klehr, F. / Koch, H. R. / Komarov, V. I. / Koptev, V. / Kulessa, P. / Kulikov, A. / Kurbatov, V. / Macharashvili, G. / Maier, R. / Mikirtytchiants, S. / Merzliakov, S. / Müller, H. / Mussgiller, L. A. / Nioradze, M. / Ohm, H. / Petrus, A. / Prasuhn, D. / Pysz, K. / Rathmann, F. / Rimarzig, B. / Rudy, Z. / Schleichert, R. / Schneider, C. / Schneider, H. / Schult, O. W. B. / Seyfarth, H. / Sistemich, K. / Stein, H. J. / Ströher, H. / ANKE Collaboration
Contributing Institute:	Institut für Kernphysik; IKP
Published in:	Nuclear physics / A, 663-664 (2000) S. 1107c
Imprint:	Amsterdam North-Holland Publ. Co. 2000
Physical Description:	1107c
Document Type:	Journal Article
Research Program:	Experimente an COSY
Series Title:	Nuclear Physics A 663-664
Subject (ZB):	J
	Publikationsportal JuSER

The new spectrometer ANKE has been put into operation at the accelerator COSY of the Forschungszentrum Julich. An initial scientific goal is to study K+-production in pA collisions at subthreshold energies below the free NN-threshold of T = 1.58 GeV. First measurements of double differential cross sections in p(12)C collisions at emission angles around 0 degrees have been performed at T = 1.0, 1.2 and 2.0 CeV. The challenge is to identify the kaons in a huge background of pions and protons, since the signal to background ratio decreases to about 10(-6) at T = 1.0 GeV. For background suppression detectors and a trigger system based on energy-loss and time-of-flight measurements have been developed. In the analysis the decay of kaons (tau = 12.4 ns) stopped in the detection system into mu(+) and pi(+) is exploited as well as the track information from the wire chambers.