First results from subthreshold K+-production measurements with ANKE

被引：5

作者：

Barsov, S ^{[1
]}

Bechstedt, U

Borchert, G

Borgs, W

Büscher, M

Debowski, M

Drochner, M

Erven, W

Esser, R

Fedorets, P

Gotta, D

Hartmann, M

Junghans, H

Kacharava, A

Kamys, B

Klehr, F

Koch, HR

Komarov, VI

Koptev, V

Kulessa, P

Kulikov, A

Kurbatov, V

Macharashvili, G

Maier, R

Mikirtichyants, S

Merzliakov, S

Müller, H

Mussgiller, A

Nioradze, M

Ohm, H

Petrus, A

Prasuhn, D

Pysz, K

Rathmann, F

Rimarzig, B

Rudy, Z

Schleichert, R

Schneider, C

Schneider, H

Schult, OWB

Seyfarth, H

Sistemich, K

Stein, HJ

Ströher, H

Wüstner, P

机构：

[1] Petersburg Nucl Phys Inst, Gatchina 188350, Russia

[2] KFA Julich, Forschungszentrum, D-52425 Julich, Germany

[3] Forschungszentrum Rossendorf EV, D-01314 Dresden, Germany

[4] Univ Cologne, D-50923 Cologne, Germany

[5] Inst Theoret & Expt Phys, Moscow 117259, Russia

[6] Joint Inst Nucl Res, Dubna 141980, Russia

[7] Tbilisi State Univ, GE-380086 Tbilisi, Georgia

[8] Jagiellonian Univ, PL-30059 Krakow, Poland

[9] Fachhsch Munich, D-80335 Munich, Germany

[10] Inst Nucl Phys, PL-31342 Krakow, Poland

[11] Univ Erlangen Nurnberg, D-91058 Erlangen, Germany

来源：

NUCLEAR PHYSICS A | 2000年 / 675卷 / 1-2期

关键词：

D O I：

10.1016/S0375-9474(00)00256-6

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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.

引用

页码：230C / 233C

页数：4

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