Publications (35)
Threshold Hyperon Production at COSY-11
T. Rozek, P. Moskal, H. -H. Adam +23
The Lambda, Sigma0 and Sigma+ hyperon production in NN collisions is studied at the COSY - 11 installation in order to investigate the production mechanism as well as to extract in…
Meson Production in p+d Reactions
M. Betigeri, J. Bojowald, A. Budzanowski +28
The production of neutral and charged pions as well as eta mesons is studied in the Delta and N* resonance region, respectively. Heavy A=3 recoils were measured with the GEM detect…
Open strangeness threshold production at COSY-11
P. Winter, H. -H. Adam, A. Budzanowski +21
The open strangeness production near threshold is investigated at the internal experiment COSY-11 in different reaction channels. Recently, the main focus has been to extend measur…
Experimental study of the eta-meson interaction with two-nucleons
P. Moskal, H. -H. Adam, A. Budzanowski +23
By means of the COSY-11 detection system, using a stochastically cooled proton beam of the cooler synchrotron COSY and a hydrogen cluster target, we have performed a high statistic…
Associated strangeness production at threshold
P. Kowina, M. Wolke, H. -H. Adam +22
The associated strangeness dissociation at threshold has been studied at the COSY-11 facility measuring the hyperon - and the K+K- meson pair production. Measurements of the near t…
P-wave dominance in the pd -> 3He pi+ pi- reaction near threshold measured with the MOMO experiment at COSY
F. Bellemann, A. Berg, J. Bisplinghoff +24
The cross section of the pd -> 3He pi+ pi - reaction has been measured at the MOMO facility in a kinematically complete experiment at a c. m. excess energy of Q = 70 MeV. The energ…
Total and Differential Cross Sections for the pp-->pp eta-prime Reaction Near Threshold
A. Khoukaz, I. Geck, C. Quentmeier +25
The eta-prime meson production in the reaction pp-->pp eta-prime has been studied at excess energies of Q = 26.5, 32.5 and 46.6 MeV using the internal beam facility COSY-11 at the…
Energy dependence of the Lambda/Sigma0 production cross section ratio in p-p interactions
P. Kowina, H. -H. Adam, A. Budzanowski +23
Measurements of the near threshold Lambda and Sigma0 production via the pp-->pK+Lambda/Sigma0 reaction at COSY--11 have shown that the Lambda/Sigma0 cross section ratio exceeds the…
On the close to threshold meson production in neutron-neutron collisions
P. Moskal, H. -H. Adam, A. Budzanowski +22
A method of measuring the close to threshold meson production in neutron-neutron collisions is described where the momenta of the colliding neutrons can be determined with the accu…
Energy Dependence of the Near-Threshold Total Cross-Section for the pp --> pp eta' Reaction
P. Moskal, H. -H. Adam, J. T. Balewski +24
Total cross sections for the pp --> pp eta' reaction have been measured in the excess energy range from Q = 1.53 MeV to Q = 23.64 MeV. The experiment has been performed at the inte…
Near Threshold K+K- Meson-Pair Production in Proton-Proton Collisions
C. Quentmeier, H. -H. Adam, J. T. Balewski +20
The near threshold total cross section and angular distributions of K+K- pair production via the reaction pp --> ppK+K- have been studied at an excess energy of Q = 17 MeV using th…
Associated strangeness production in pp collisions near threshold
P. Winter, H. -H. Adam, A. Budzanowski +23
Motivated by the ongoing discussion concerning the nature of the scalar resonances f0(980) and a0(980), the COSY-11 collaboration has taken exclusive data on the pp->ppK+K- reactio…
Analysing power A_y in the reaction p(pol) p --> p p eta close to threshold
P. Winter, H. -H. Adam, F. Bauer +25
Measurements of the eta meson production with a polarised proton beam in the reaction p(pol) p --> p p eta have been carried out at an excess energy of Q = 40 MeV. The dependence o…
Simultaneous Measurements of the Reactions
M. Betigeri, J. Bojowald, A. Budzanowski +28
A stack of annular detectors made of high purity germanium was used to measure simultaneously and differential cross sections at beam momenta…
Towards the excitation function of the pp -> ppK+K- reaction at COSY-11
P. Winter, H. -H. Adam, A. Budzanowski +23
The ongoing discussion concerning the nature of the scalar resonances f_0(980) and a_0(980) implicated to extend the studies of the pp -> ppK+K- reaction near the production thresh…
Measurement of p + d -> 3He + eta in S(11) Resonance
M. Betigeri, J. Bojowald, A. Budzanowski +36
We have measured the reaction p + d -> 3He + eta at a proton beam energy of 980 MeV, which is 88.5 MeV above threshold using the new ``germanium wall'' detector system. A missing--…
Monitoring of the accelerator beam distributions for internal target facilities
P. Moskal, H. -H. Adam, A. Budzanowski +19
We describe a direct method for monitoring the geometrical dimensions of a synchrotron beam at the target position for internal target installations. The method allows for the obse…
Strangeness Production in Proton-Proton Collisions Close to Threshold
By M. Wolke, H. -H. Adam, A. Budzanowski +22
Exclusive data on the reactions pp -> ppK+K- and pp -> pK+ Lambda/Sigma0 have been taken at the cooler synchrotron COSY close to threshold. At equal excess energies, an enhancement…
Study of the eta-proton interaction via the reaction p p --> p p eta
P. Moskal, H. H. Adam, A. Budzanowski +23
A measurement of the pp --> p p eta reaction at the excess energy of Q = 15.5 +- 0.4 MeV has been carried out at the internal beam facility COSY-11 with an integrated luminosity of…
Differential Cross Sections Measurement for the Reaction at 850 MeV/c
M. Betigeri, J. Bojowald, A. Budzanowski +28
The present data support a large anisotropy in accordance with phase shift predictions and in contrast to another recent experiment.
Near-Threshold eta Meson Production in Proton-Proton Collisions
J. Smyrski, P. Wuestner, A. Budzanowski +18
The production of eta mesons has been measured in the proton-proton interaction close to the reaction threshold using the COSY-11 internal facility at the cooler synchrotron COSY.…
First close-to-threshold measurement of the analyzing power Ay in the reaction p(pol)p -> pp eta
P. Winter, H. -H. Adam, A. Budzanowski +24
At the internal facility COSY-11 a first measurement of the reaction p(pol)p -> pp eta near the production threshold has been performed. Results for the analysing power will be pre…
Upper limit for the cross section of the overlapping scalar resonances f0(980) and a0(980) produced in proton-proton collisions in the range of the reaction threshold
P. Moskal, H. -H. Adam, A. Budzanowski +26
Utilizing a missing mass technique we investigate the pp --> ppX reaction scanning beam energies in the range permitting to create a mass close to that of the f0(980) and a0(980) s…
Heavy Meson Production at COSY - 11
By P. Moskal, H. -H. Adam, J. T. Balewski +21
The COSY-11 collaboration has measured the total cross section for the pp --> pp eta-prime and pp --> pp eta reactions in the excess energy range from Q = 1.5 MeV to Q = 23.6 MeV a…
Energy dependence of the Lambda/Sigma0 production cross section ratio in proton proton interactions
P. Kowina, M. Wolke, H. -H. Adam +26
The production of the Lambda and Sigma0 hyperons has been measured via the pp->pK+Lambda / Sigma0 reaction at the internal COSY-11 facility in the excess energy range between 14 an…
Analysis of the eta meson production mechanism via the p(pol)p-->ppeta reaction
R. Czyzykiewicz, H. -H. Adam, A. Budzanowski +23
Polarisation observables constitute a powerful tool for establishing the production mechanism of the eta meson and for infering the presence of higher partial waves in the final sy…
Experimental results on strangeness production in proton-proton collisions at COSY
P. Moskal, H. -H. Adam, A. Budzanowski +21
The production of K+ and K- mesons in elementary proton-proton collision has been investigated at the Cooler Synchrotron COSY in Juelich. A high quality proton beam with low emitta…
Kaon Production and Interaction
By M. Wolke, H. -H. Adam, A. Budzanowski +21
Exclusive data on both the elementary kaon and antikaon production channels have been taken at the cooler synchrotron COSY in proton-proton scattering. In the kaon--hyperon product…
Proton-proton collisions at production thresholds
P. Moskal, H. -H. Adam, A. Budzanowski +21
Recent results obtained by the COSY-11 collaboration concerning the production of eta and eta' mesons in the pp --> pp Meson reaction are presented. A comparison of the production…
Analysing power A(y) in the reaction p(pol.)p --> pp eta near threshold
P. Winter, H. H. Adam, A. Budzanowski +23
A first measurement of the analysing power in the reaction p(pol)p --> pp eta near the production threshold has been performed at the internal facility COSY-11 at the COoler SYnchr…
Production of eta and eta-prime mesons via the quasi-free proton-neutron interaction
P. Moskal, H. -H. Adam, A. Budzanowski +24
A comparison of the close-to-threshold total cross sections for the eta-prime meson production in both the pp --> pp eta-prime and pn --> pn eta-prime reactions should provide insi…
Hadronic interaction of eta and eta-prime mesons with nucleons
P. Moskal, H. H. Adam, A. Budzanowski +22
Due to their short life-time, flavour-neutral mesons cannot be utilized as free secondary beams or targets, and therefore a study of their interaction with nucleons is not possible…
Eta physics at threshold
P. Moskal, H. -H. Adam, A. Budzanowski +22
The production of eta and eta-prime mesons in elementary nucleon-nucleon collisions has been investigated at the synchrotrons CELSIUS, COSY and SATURNE. The magnitude and energy de…
On the Delta I = 1/2 rule in the Lambda N ----> N N reaction
Z. Rudy, W. Cassing, L. Jarczyk +4
It is shown that the mass dependence of the -lifetime in heavy hypernuclei is sensitive to the ratio of neutron-induced to proton-induced non-mesonic decay rates R_n/R_p. A com…
S-wave eta'-proton FSI; phenomenological analysis of near-threshold production of pi0, eta, and eta' mesons in proton-proton collisions
P. Moskal, H. -H. Adam, J. T. Balewski +21
We describe a novel technique for comparing total cross sections for the reactions pp --> pp pi(0), pp --> pp eta, and pp --> pp eta' close to threshold. The initial and final stat…