Publications (103)
Feasibility Study for an EDM Storage Ring
F. Abusaif, A. Aggarwal, A. Aksentev +92
This project exploits charged particles confined as a storage ring beam (proton, deuteron, possibly He) to search for an intrinsic electric dipole moment (EDM, ) aligne…
Two-proton correlation function for the pp -> pp+eta and pp -> pp+pions reactions
P. Klaja, P. Moskal, E. Czerwinski +19
For the very first time, the correlation femtoscopy method is applied to a kinematically complete measurement of meson production in the collisions of hadrons. A two-proton correla…
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…
General thoughts to the Kaon pair production in the threshold region
W. Oelert, H. -H. Adam, A. Budzanowski +22
Simple--minded thoughts about the cross sections for the reactions pp-->ppK+K- and pp-->ppK0K0 are presented, which certainly do not account for the complex coupled channel problem…
Low-Energy $Î-\p$ Scattering Parameters from the Reaction
J. T. Balewski, A. Budzanowski, C. Goodman +21
Constraints on the spin-averaged scattering length and effective range have been obtained from measurements of the reaction close to the production threshold b…
Study of the production mechanism of the eta meson by means of analysing power measurements
R. Czyzykiewicz, P. Moskal, H. -H. Adam +26
Information about the production mechanism of the eta meson in proton-proton collisions can be inferred by confronting the experimental studies on the analysing power for the p(pol…
Total Cross Section of the Reaction pp \to pK^+ÎClose to Threshold
J. T. Balewski, A. Budzanowski, H. Dombrowski +31
The energy dependence of the total cross section for the pp \to pK^+Îreaction was measured in the threshold region covering the excess energy range up to 7MeV. Existing model calc…
Study of the hadronic production of kaon pairs below the threshold for the phi meson
P. Moskal, M. Silarski, A. Budzanowski +24
The near threshold production of K+K- pairs in proton-proton collisions has been investigated at the cooler synchrotron COSY below and above the threshold for the meson using…
Generalized Dalitz Plot analysis of the near threshold pp-->ppK+K- reaction in view of the K+K- final state interaction
M. Silarski, P. Moskal, E. Czerwinski +21
The excitation function for the reaction revealed a significant enhancement close to threshold which may plausibly be assigned to the influence of the and $…
Trapped Antihydrogen in Its Ground State
G. Gabrielse, R. Kalra, W. S. Kolthammer +13
Antihydrogen atoms are confined in an Ioffe trap for 15 to 1000 seconds -- long enough to ensure that they reach their ground state. Though reproducibility challenges remain in mak…
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…
Eta and eta' mesons production at COSY-11
P. Moskal, H. -H. Adam, A. Budzanowski +24
The low emittance and small momentum spread of the proton and deuteron beams of the Cooler Synchrotron COSY combined with the high mass resolution of the COSY-11 detection system p…
First detection of collective oscillations of a stored deuteron beam with an amplitude close to the quantum limit
J. Slim, N. N. Nikolaev, F. Rathmann +41
We investigated coherent betatron oscillations of a deuteron beam in the storage ring COSY, excited by a detuned radio-frequency Wien filter. The beam oscillations were detected by…
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…
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…
Isospin dependence of the eta' meson production in nucleon--nucleon collisions
J. Przerwa, H. -H. Adam, A. Budzanowski +22
According to the quark model, the masses of eta and eta' mesons should be almost equal. However, the empirical values of these masses differ by more than the factor of two. Similar…
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…
Demonstrating CBM Capabilities by Baryon Reconstruction in Ni+Ni Collisions with the mCBM Experiment at SIS18 of GSI/FAIR
CBM Collaboration, A. Agarwal, Z. Ahammed +338
The Compressed Baryonic Matter (CBM) experiment at the upcoming Facility for Antiproton and Ion Research (FAIR) is a high-rate fixed-target experiment designed to investigate nucle…
A New Beam Polarimeter at COSY to Search for Electric Dipole Moments of Charged Particles
F. Müller, O. Javakhishvili, D. Shergelashvili +53
A calorimetric polarimeter based on inorganic LYSO scintillators is described. It has been designed for use in a storage ring to search for electric dipole moments (EDM) of charged…
Near threshold eta meson production in dp collisions
C. Piskor-Ignatowicz, J. Smyrski, P. Moskal +23
Preliminary results of recent measurements of the near threshold eta meson production in the dp-->dp eta reaction are presented. The experiment was performed at the COSY-Juelich ac…
Near threshold production of the pseudoscalar mesons at the COSY-11 facility
P. Moskal, R. Czyzykiewicz, H. -H. Adam +25
We summarise measurements of the COSY-11 collaboration concerning the excitation functions of the near threshold pseudoscalar meson production in the proton-proton interaction. The…
Isospin dependence of the eta prime meson production in nucleon-nucleon collisions
J. Przerwa, P. Moskal, A. Budzanowski +24
A comparison of the close-to-threshold total cross section for the eta prime production in pp --> pp eta prime and pn --> pn eta prime reactions constitutes a tool to investigate t…
Heavy Hyperon--Antihyperon Production
W. Oelert, D. Grzonka, L. Jarczyk +3
Based on the experience from the production of anti-Lambda Lambda and anti-Sigma Sigma pairs at LEAR (experiment PS185) it is suggested to continue the investigations towards the h…
Experimental study of pp eta dynamics in the pp --> ppeta reaction
P. Moskal, H. -H. Adam, A. Budzanowski +24
A high statistics measurement of the pp --> ppeta reaction at an excess energy of Q = 15.5 MeV has been performed at the internal beam facility COSY-11. The stochastically cooled p…
Search for the 3He-eta bound state at COSY-11
W. Krzemien, J. Smyrski, A. Budzanowski +21
We have measured excitation function for dp -> ppp_pi- reaction near the eta production threshold. We observe an enhancement of the counting rate above the threshold which can orig…
High precision measurement of the associated strangeness production in proton proton interactions
TOF Collaboration, S. Jowzaee, E. Borodina +23
A new high precision measurement of the reaction pp -> pK+Lambda at a beam momentum of 2.95 GeV/c with more than 200,000 analyzed events allows a detailed analysis of differential…
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…
Search for Bremsstrahlung radiation in quasi-free n p --> n p gamma reactions
J. Przerwa, H. -H. Adam, A. Budzanowski +22
Due to the high sensitivity of the N N --> N N gamma reaction to the nucleon-nucleon potential, Bremsstrahlung radiation is used as a tool to investigate details of the nucleon-nuc…
Final-State Interactions in the Process pp -> pKLambda
M. Röder, E. Borodina, H. Clement +23
The possibility to determine the pLambda scattering length from the final-state interaction in the reaction pp->pKLambda is investigated experimentally. From a transversely polariz…
Correlation Femtoscopy for Studying Eta Meson Production Mechanism
P. Klaja, P. Moskal, H. -H. Adam +27
The high statistics data from the pp -> ppeta reaction measurement, delivered by the COSY-11 collaboration, are now being evaluated using the correlation femtoscopy technique. This…
Maintaining a Resonance Condition of an RF Spin Rotator Through a Feedback Loop in a Storage Ring
V. Hejny, A. Andres, J. Pretz +63
This paper presents the successful application of a phase-lock feedback system to maintain the resonance condition of a radio frequency (rf) spin rotator (specifically, an rf Wien…
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…
production in proton-proton scattering close to threshold}
P. Moskal, J. T. Balewski, A. Budzanowski +27
The (958) reaction has been measured at COSY using the internal beam and the COSY-11 facility. The total cross sections at the four different excess energie…
Phase locking the spin precession in a storage ring
N. Hempelmann, V. Hejny, J. Pretz +66
This letter reports the successful use of feedback from a spin polarization measurement to the revolution frequency of a 0.97 GeV/ bunched and polarized deuteron beam in the Coo…
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…
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…
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…
Comparison of Lambda and Sigma(0) Threshold Production in Proton-Proton Collisions
S. Sewerin, G. Schepers, J. T. Balewski +27
Threshold measurements of the associated strangeness production reactions pp --> p K(+) Lambda and pp --> p K(+) Sigma(0) are presented. Although slight differences in the shapes o…
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…
First Model-Independent Measurement of the Spin Triplet Scattering Length from Final State Interaction in the Reaction
TOF Collaboration, F. Hauenstein, E. Borodina +24
The reaction has been measured with the COSY-TOF detector at a beam momentum of . The polarized proton beam enables the measure…
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…
Storage Ring to Search for Electric Dipole Moments of Charged Particles -- Feasibility Study
F. Abusaif, A. Aggarwal, A. Aksentev +98
The proposed method exploits charged particles confined as a storage ring beam (proton, deuteron, possibly He) to search for an intrinsic electric dipole moment (EDM) aligned a…
Hadronic interaction of the eta meson with two nucleons
P. Moskal, H. -H. Adam, A. Budzanowski +21
The COSY-11 collaboration has conducted experiments aiming at the determination of the excitation function and phase-space population of the p p --> p p eta reaction close to the k…
Beam-based alignment at the Cooler Synchrotron COSY as a prerequisite for an electric dipole moment measurement
T. Wagner, A. Nass, J. Pretz +47
The Jülich Electric Dipole moment Investigation (JEDI) collaboration aims at a direct measurement of the Electric Dipole Moment (EDM) of protons and deuterons using a storage ring…
Near threshold production of the eta meson via the quasi-free pn --> pn eta reaction
P. Moskal, R. Czyzykiewicz, H. -H. Adam +29
Total cross sections for the quasi-free pn --> pn eta reaction in the range from the kinematical threshold up to 20 MeV excess energy have been determined. At threshold they exceed…
Two-Symmetry Penning-Ioffe Trap for Antihydrogen Cooling and Spectroscopy
E. Tardiff, X. Fan, G. Gabrielse +12
High-accuracy spectroscopic comparisons of trapped antihydrogen atoms () and hydrogen atoms () promise to stringently test the fundamental CPT symmet…
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…
Extracting the depolarization coefficient D_NN from data measured with a full acceptance detector
F. Hauenstein, H. Clement, R. Dzhygadlo +8
The spin transfer from vertically polarized beam protons to Lambda or Sigma hyperons of the associated strangeness production pp -> pK Lambda (Sigma) is described with the depolari…
Drift chamber with a c-shaped frame
J. Smyrski, Ch. Kolf, H. -H. Adam +26
We present the construction of a planar drift chamber with wires stretched between two arms of a c-shaped aluminium frame. The special shape of the frame allows to extendthe moment…
MesonNet 2013 International Workshop. Mini-proceedings
M. J. Amaryan, M. Bashkanov, M. Benayoun +54
The mini-proceedings of the MesonNet 2013 International Workshop held in Prague from June 17th to 19th, 2013, are presented. MesonNet is a research network within EU HadronPhysics3…
Measurement of the invariant mass distributions for the pp -> ppeta' reaction at excess energy of Q = 16.4 MeV
P. Klaja, P. Moskal, E. Czerwinski +20
The proton-proton and proton-eta' invariant mass distributions have been determined for the pp -> ppeta' reaction at an excess energy of Q = 16.4 MeV. The measurement was carried o…
On the SigmaN cusp in the pp -> pK+Lambda reaction
S. Abd El-Samad, E. Borodina, K. -Th. Brinkmann +24
Measurements of the reaction at = 2.28 GeV have been carried out at COSY-TOF. In addition to the FSI and resonance excitation effects a pronounced…
Pilot bunch and co-magnetometry of polarized particles stored in a ring
J. Slim, F. Rathmann, A. Andres +60
In polarization experiments at storage rings, one of the challenges is to maintain the spin-resonance condition of a radio-frequency spin rotator with the spin-precessions of the o…
Determination of the eta'-proton scattering length in free space
E. Czerwinski, P. Moskal, M. Silarski +13
Taking advantage of both the high mass resolution of the COSY-11 detector and the high energy resolution of the low-emittance proton-beam of the Cooler Synchrotron COSY we determin…
New results on the pd --> 3He eta production near threshold
H. -H. Adam, A. Khoukaz, N. Lang +22
Measurements on the eta meson production in proton-deuteron collisions have been performed using the COSY-11 facility at COSY Juelich. Here we present preliminary results on total…
Kaon pair production close to threshold
P. Winter, M. Wolke, H. -H. Adam +22
The total cross section of the reaction pp->ppK+K- has been measured at excess energies Q=10 MeV and 28 MeV with the magnetic spectrometer COSY-11. The new data show a significant…
New method for a continuous determination of the spin tune in storage rings and implications for precision experiments
D. Eversmann, V. Hejny, F. Hinder +98
A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, the spin tune - defined as the number of spin precessions per turn - is given by…
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…
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…
Dynamics of the near threshold eta meson production in proton-proton interaction
R. Czyzykiewicz, P. Moskal, H. -H. Adam +28
We present the results of measurements of the analysing power for the p(pol)p --> pp eta reaction at the excess energies of Q=10 and 36 MeV, and interpret these results within 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…
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…
Study of the 3He-eta system in d-p collisions at COSY-11
J. Smyrski, H. -H. Adam, A. Budzanowski +27
We present preliminary results from dp --> 3He X (X=pi0,eta) measurements near the eta production threshold. The data were taken during a slow ramping of the COSY internal deuteron…
Study of the 3He-eta system in d-p collisions
J. Smyrski, H. -H. Adam, A. Budzanowski +22
We have measured excitation functions for the d+p->3He+X, (X=pi0, eta) channels near the eta production threshold. The data were taken during a slow ramping of the COSY internal de…
First Experimental Limit on the Permanent Electric Dipole Moment of the Deuteron
A. Andres, V. Hejny, A. Nass +68
Permanent electric dipole moments (EDMs) provide a sensitive probe of physics beyond the Standard Model and are directly linked to additional sources of CP violation that could exp…
Upper limit of the total cross section for the pn --> pn eta' reaction
J. Klaja, P. Moskal, S. D. Bass +22
The upper limit of the total cross section for the pn --> pn eta' reaction has been determined near the kinematical threshold in the excess energy range from 0 to 24 MeV. The measu…
A method to disentangle single- and multi-meson production in missing mass spectra from quasi-free pn --> pn X reactions
P. Moskal, H. -H. Adam, A. Budzanowski +25
The separation of contributions from multi- and single-meson production in the missing mass spectrum of the quasi-free pn --> pnX reaction constitutes a~challenging task when the r…
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…
P371 Experiment at CERN -- quest for polarized antiprotons
M. Zielinski, D. Grzonka, G. Khatri +6
Polarization effects in the production of antiprotons at the CERN PS beam line T11 at 3.5 GeV/c have been investigated within the P371 experiment. These effects, if found to be sig…
Study of the ground and excited states of Lambda and Sigma hyperon production at COSY
D. Grzonka
COSY with a maximum beam momentum of ~3.65 GeV/c allows the production of ground state (Lambda and Sigma) and excited hyperons (Lambda(1405), Sigma(1385) and Lambda(1520)) in eleme…
Measurement of deuteron carbon vector analyzing powers in the kinetic energy range 170-380 MeV
JEDI Collaboration, F. Müller, M. Zurek +58
A measurement of vector analyzing powers in elastic deuteron-carbon scattering has been performed at the Cooler Synchrotron COSY of Forschungszentrum Jülich, Germany. Seven kineti…
Search for polarization effects in the antiproton production process
D. Grzonka, K. Kilian, J. Ritman +21
For the production of a polarized antiproton beam various methods have been suggested including the possibility that antiprotons may be produced polarized which will be checked exp…
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…
Summary of the COSY-11 Measurements of Hyperon Production
D. Grzonka
The studies of hyperon production performed at COSY-11 are summarized. The results of the experiments in the reaction channels pp-->pK+Lambda, pp-->pK+Sigma0, and pp-->nK+Sigma+ ar…
Determination of the total width of the eta' meson
E. Czerwinski, P. Moskal, D. Grzonka +19
Taking advantage of both the low-emittance proton-beam of the Cooler Synchrotron COSY and the high momentum precision of the COSY-11 detector system, the mass distribution of the e…
The analysing power for the p(pol)p --> pp eta reaction at Q=10 MeV
R. Czyzykiewicz, P. Moskal, H. -H. Adam +29
The analyzing power A_y for the p(pol)p --> pp eta reaction has been determined at the beam momentum p_{beam}=2010 MeV/c, corresponding to the excess energy Q=10 MeV. In the paper…
Measurement of polarization observables of the associated strangeness production in proton proton interactions
TOF Collaboration, F. Hauenstein, E. Borodina +23
The Lambda polarization, the analyzing power, and the Lambda spin transfer coefficient of the reaction pp -> p K+ Lambda were measured at beam momenta of 2.70 GeV/c and 2.95 GeV/c,…
Invariant mass distributions for the pp to p p eta reaction at Q=10 MeV
P. Moskal, R. Czyzykiewicz, E. Czerwinski +20
Proton-proton and proton-eta invariant mass distributions and the total cross section for the pp to pp eta reaction have been determined near the threshold at an excess energy of Q…
Mechanism of the close-to-threshold production of the eta meson
R. Czyzykiewicz, P. Moskal, H. -H. Adam +26
Measurements of the analysing power for the p(pol)p --> ppeta reaction have been performed in the close-to-threshold energy region at beam momenta of p_{beam}=2.010 and 2.085 GeV/c…
Polarization observables in the eta meson production
P. Winter, R. Czyzykiewicz, H. -H. Adam +19
We propose to extend the investigations of the eta meson production in nucleon-nucleon collisions by studying single and double polarization observables. Over the last years, the e…
Production of Eta Mesons in Proton-Proton Collisions Close to Threshold
R. Czyzykiewicz, H. -H. Adam, A. Budzanowski +22
A brief experimental overview on the close-to-threshold eta meson production in proton-proton interactions is presented and the available observables in measurements with unpolariz…
A recoil detector for the measurement of antiproton-proton elastic scattering at angles close to 90
Q. Hu, U. Bechstedt, A. Gillitzer +11
The design and construction of a recoil detector for the measurement of recoil protons of antiproton-proton elastic scattering at scattering angles close to 90 are descri…
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…
Proposal for the first measurement of antiproton polarization in proton-nucleus interactions
D. Alfs, D. Grzonka, G. Khatri +7
Spin dependent phenomena in inclusive hadron production have been extensively investigated, yet their microscopic origin and universality across different hadrons are still not ful…
Spin decoherence and off-resonance behavior of radiofrequency-driven spin rotations in storage rings
N. N. Nikolaev, F. Rathmann, J. Slim +60
Radiofrequency-driven resonant spin rotators are routinely used as standard instruments in polarization experiments in particle and nuclear physics. Maintaining the continuous exac…
Production and electromagnetic decay of hyperons: a feasibility study with HADES as a Phase-0 experiment at FAIR
J. Adamczewski-Musch, A. Belyaev, A. Blanco +127
A feasibility study has been performed in order to investigate the performance of the HADES detector to measure the electromagnetic decays of the hyperon resonances , $…
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…
Measurement of proton-proton elastic scattering into the Coulomb region at = 2.5, 2.8 and 3.2 GeV/c
H. Xu, Y. Zhou, U. Bechstedt +18
The proton--proton elastic differential cross section at very small four momentum transfer squared has been measured at three different incident proton momenta in the range of 2.5…
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…
Spin tune mapping as a novel tool to probe the spin dynamics in storage rings
A. Saleev, N. N. Nikolaev, F. Rathmann +61
Precision experiments, such as the search for electric dipole moments of charged particles using storage rings, demand for an understanding of the spin dynamics with unprecedented…
Threshold hyperon production in proton-proton collisions at COSY-11
T. Rozek, D. Grzonka, H. -H. Adam +23
Sigma+ hyperon production was measured at the COSY-11 spectrometer via the p p --> n K+ Sigma+ reaction at excess energies of Q = 13 MeV and Q = 60 MeV. These measurements continue…
Phase Measurement for Driven Spin Oscillations in a Storage Ring
N. Hempelmann, V. Hejny, J. Pretz +65
This paper reports the first simultaneous measurement of the horizontal and vertical components of the polarization vector in a storage ring under the influence of a radio frequenc…
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…
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…
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…
Measurement of the dp -->3He eta reaction near threshold
J. Smyrski, H. -H. Adam, A. Budzanowski +24
Total and differential cross sections for the dp --> 3He eta reaction have been measured near threshold for 3He center-of-mass momenta in the range from 17.1 MeV/c to 87.5 MeV/c. T…
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…