Publications (49)
Strangeness Photoproduction at the BGO-OD experiment
T. C. Jude, S. Alef, P. Bauer +30
The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists o…
Photoproduction of meson pairs: First measurement of the polarization observable I^s
E. Gutz, V. Sokhoyan, H. van Pee +64
The polarization observable I^s, a feature exclusive to the acoplanar kinematics of multi-meson final states produced via linearly polarized photons, has been measured for the firs…
Measurement of the LT-asymmetry in Ï^0 electroproduction at the energy of the Î(1232) resonance
D. Elsner, A. Süle, P. Barneo +29
The reaction p(e,e'p)pi^0 has been studied at Q^2=0.2 (GeV/c)^2 in the region of W=1232 MeV. From measurements left and right of q, cross section asymmetries Ï_LT have been obtain…
The focal plane proton-polarimeter for the 3-spectrometer setup at MAMI
T. Pospischil, P. Bartsch, D. Baumann +46
For experiments of the type A(\vec e,e'\vec p) the 3-spectrometer setup of the A1 collaboration at MAMI has been supplemented by a focal plane proton-polarimeter. To this end, a ca…
Determination of the real part of the η'-Nb optical potential
M. Nanova, S. Friedrich, V. Metag +51
The excitation function and momentum distribution of η' mesons have been measured in photoproduction off 93^Nb in the energy range of 1.2-2.9 GeV. The experiment has been performe…
Photoproduction of eta-mesons off nuclei for Eg < 2.2 GeV
T. Mertens, I. Jaegle, P. Muehlich +69
Photoproduction of mesons off C, Ca, Nb, and Pb nuclei has been measured with a tagged photon beam with energies between 0.6 and 2.2 GeV. The expe…
photoproduction at forward angles near threshold with the BGOOD experiment
E. O. Rosanowski, T. C. Jude, S. Alef +22
The differential cross section for was measured from threshold to a centre-of-mass energy of 2090\,MeV at forward angles at the BGOOD experiment. The h…
Measurement of double polarisation asymmetries in -photoproduction
H. Eberhardt, T. C. Jude, H. Schmieden +72
The first measurements of the beam-target-helicity-asymmetries and in the photoproduction of -mesons off protons at the CBELSA/TAPS experiment are reported. () w…
High statistics study of the reaction
V. Sokhoyan, E. Gutz, V. Crede +62
The photoproduction of 2 mesons off protons was studied with the Crystal Barrel/TAPS experiment at the electron accelerator ELSA in Bonn. The energy of photons produced in a…
Photoproduction of extending to forward angles and low momentum transfer
G. Scheluchin, T. C. Jude, S. Alef +32
photoproduction has been studied at the BGOOD experiment via the all neutral decay, . The unique BGOOD experimental setup allows both the…
First measurement of the helicity asymmetry for in the resonance region
M. Gottschall, A. V. Anisovich, B. Bantes +64
The first measurement of the helicity dependence of the photoproduction cross section of single neutral pions off protons is reported for photon energies from 600 to 2300\,MeV, cov…
First measurements of the ^16O(e,e'pn)^14N reaction
D. G. Middleton, J. R. M. Annand, C. Barbieri +39
This paper reports on the first measurement of the ^16O(e,e'pn)^14N reaction. Data were measured in kinematics centred on a super-parallel geometry at energy and momentum transfers…
The N(1520) 3/2- helicity amplitudes from an energy-independent multipole analysis based on new polarization data on photoproduction of neutral pions
J. Hartmann, H. Dutz, A. V. Anisovich +74
New data on the polarization observables T, P, and H for the reaction are reported. The results are extracted from azimuthal asymmetries when a transversely polariz…
Measurement of polarisation observables in photoproduction off the proton
R. Ewald, A. V. Anisovich, B. Bantes +57
The reaction is studied in the photon energy range from threshold. Linearly polarised photon beams from coherent bremsstrahlung enabled the first m…
Transparency ratio in γA -> η' A' and the in-medium η' width
M. Nanova, V. Metag, A. Ramos +58
The photoproduction of η'-mesons off different nuclei has been measured with the CBELSA/TAPS detector system for incident photon energies between 1500 - 2200 MeV. The transparency…
Modification of the -Meson Lifetime in Nuclear Matter
M. Kotulla, D. Trnka, P. Mühlich +65
The photo production of mesons on the nuclei C, Ca, Nb and Pb has been measured using the Crystal Barrel/TAPS detector at the ELSA tagged photon facility in Bonn. The dependen…
New data on with polarized photons and protons and their implications for decays
J. Müller, J. Hartmann, M. Grüner +86
The polarization observables , and in photoproduction of mesons off protons are measured for photon energies from threshold to MeV (), 2280 MeV ($…
Well-established nucleon resonances revisited by double-polarization measurements
A. Thiel, A. V. Anisovich, D. Bayadilov +64
The first measurement is reported of the double-polarization observable G in photoproduction of neutral pions off protons, covering the photon energy range from 620 to 1120 MeV and…
Coherent photoproduction at forward deuteron angles measured at BGOOD
A. J. Clara Figueiredo, T. C. Jude, S. Alef +18
The coherent reaction, was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 3200\,MeV. A full kinematic reconstructi…
Photoproduction of mesons on nuclei near the production threshold
M. Nanova, J. Weil, S. Friedrich +67
The photoproduction of mesons on LH_2, C and Nb has been studied for incident photon energies from 900 to 1300 MeV using the CB/TAPS detector at ELSA. The line shape does…
Photoproduction of Ï Mesons off the Proton
A. Wilson, V. Crede, A. V. Anisovich +62
The differential cross sections and unpolarized spin-density matrix elements for the reaction were measured using the CBELSA/TAPS experiment for initial photon energie…
Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold
R. Ewald, A. V. Anisovich, B. Bantes +57
The photoproduction reaction is investigated in the energy region from threshold to \,MeV. The differential cross section exhibits increa…
Measurement of the recoil polarization in the p (\vec e, e' \vec p) pi^0 reaction at the Î(1232) resonance
Th. Pospischil, P. Bartsch, D. Baumann +39
The recoil proton polarization has been measured in the p (\vec e,e'\vec p) pi^0 reaction in parallel kinematics around W = 1232 MeV, Q^2 = 0.121 (GeV/c)^2 and epsilon = 0.718 usin…
Observation of a structure in the M invariant mass distribution near 1700 MeV/ in the reaction
V. Metag, M. Nanova, J. Hartmann +74
The reaction has been studied with the CBELSA/TAPS detector at the electron stretcher accelerator ELSA in Bonn for incident photon energies from thresho…
Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in pi^0-photoproduction off the proton
D. Elsner, B. Bantes, O. Bartholomy +55
At the electron accelerator ELSA a linearly polarised tagged photon beam is produced by coherent bremsstrahlung off a diamond crystal. Orientation and energy range of the linear po…
Measurement of the beam-helicity asymmetry in the p(e_pol,e'p)pi_0 reaction at the energy of the Delta(1232) resonance
P. Bartsch, D. Baumann, J. Bermuth +32
In a p(e_pol,e'p)pi_0 out-of-plane coincidence experiment at the 3-spectrometer setup of the Mainz Microtron MAMI, the beam-helicity asymmetry has been precisely measured around th…
Strangeness Photoproduction at the BGO-OD Experiment
T. C. Jude, S. Alef, D. Bayadilov +61
BGO-OD is a newly commissioned experiment to investigate the internal structure of the nucleon, using an energy tagged bremsstrahlung photon beam at the ELSA electron facility. The…
Measurement of the Electric Form Factor of the Neutron at Q^2 = 0.3-0.8 (GeV/c)^2
D. I. Glazier, M. Seimetz, J. R. M. Annand +41
The electric form factor of the neutron, G_En, has been measured at the Mainz Microtron by recoil polarimetry in the quasielastic D(e_pol,e'n_pol)p reaction. Three data points have…
Photoproduction of and Mesons off Protons
The CBELSA, TAPS Collaboration, : +69
Total and differential cross sections for and photoproduction off the proton have been determined with the CBELSA/TAPS detector for photon energies between 0.85 an…
Measurement of the Helicity Asymmetry for the reaction
TAPS collaboration, M. Gottschall, F. Afzal +66
A measurement of the double-polarization observable for the reaction is reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility in Bo…
The η'-carbon potential at low meson momenta
M. Nanova, S. Friedrich, V. Metag +58
The production of mesons in coincidence with forward-going protons has been studied in photon-induced reactions on C and on a liquid hydrogen (LH) target for…
Photoproduction of -mesons off the deuteron
I. Jaegle, T. Mertens, A. Fix +62
Quasi-free photoproduction of mesons off nucleons bound in the deuteron has been measured with the combined Crystal Barrel - TAPS detector. The experiment was done at a tagge…
Quasi-free photoproduction of eta-mesons of the neutron
I. Jaegle, T. Mertens, A. V. Anisovich +69
Quasi-free photoproduction of eta-mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn E…
Observation of a cusp-like structure in the cross section at forward angles and low momentum transfer
T. C. Jude, S. Alef, P. Bauer +39
The differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in e…
Double-polarization observable G in neutral-pion photoproduction off the proton
A. Thiel, H. Eberhardt, M. Lang +69
This paper reports on a measurement of the double-polarization observable G in photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bon…
Momentum dependence of the imaginary part of the - and -nucleus optical potential
S. Friedrich, M. Nanova, V. Metag +57
The photoproduction of and mesons off carbon and niobium nuclei has been measured as a function of the meson momentum for incident photon energies of 1.2-2.9 GeV a…
Experimental constraints on the -nucleus real potential
S. Friedrich, K. Makonyi, V. Metag +61
In a search for mesic states, the production of -mesons in coincidence with forward going protons has been studied in photon induced reactions on C for incident pho…
The BGOOD experimental setup at ELSA
S. Alef, P. Bauer, D. Bayadilov +58
The BGOOD experiment at the ELSA facility in Bonn has been commissioned within the framework of an international collaboration. The experiment pursues a systematic investigation of…
Determination of the η'-nucleus optical potential
M. Nanova, V. Metag, E. Ya. Paryev +59
The excitation function and momentum distribution of mesons have been measured in photon induced reactions on C in the energy range of 1250-2600 MeV. The exper…
photoproduction at forward angles and low momentum transfer
S. Alef, P. Bauer, D. Bayadilov +39
differential cross sections and recoil polarisation data from threshold for extremely forward angles are presented. The measurements were performed at the…
Quasi-free photoproduction of eta-mesons off the deuteron
I. Jaegle, B. Krusche, A. V. Anisovich +69
Precise data for quasi-free photoproduction of mesons off the deuteron have been measured at the Bonn ELSA accelerator with the combined Crystal Barrel/TAPS detector for incid…
Photoproduction of eta mesons from the neutron: cross sections and double polarization observable E
L. Witthauer, M. Dieterle, F. Afzal +70
Photoproduction of mesons from neutrons} \abstract{Results from measurements of the photoproduction of mesons from quasifree protons and neutrons are summarized. The expe…
Polarization observables in double neutral pion photoproduction
TAPS Collaboration, T. Seifen, J. Hartmann +73
Measurements of target asymmetries and double-polarization observables for the reaction are reported. The data were taken with the CBELSA/TAPS experiment at the…
Evidence of a dibaryon spectrum in coherent photoproduction at forward deuteron angles
T. C. Jude, S. Alef, R. Beck +27
The coherent reaction, was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 2850\,MeV. A full kinematic reconstru…
The polarization observables T, P, and H and their impact on multipoles
J. Hartmann, H. Dutz, A. V. Anisovich +76
Data on the polarization observables T, P, and H for the reaction are reported. Compared to earlier data from other experiments, our data are more precise and extend…
Photoproduction of Neutral Pions off Protons
TAPS Collaboration, V. Crede, N. Sparks +59
Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector in the reaction for photon energies between 0.85 and 2.50 GeV. The mesons are…
Measurement of the Beam Asymmetry in the Forward Direction for pi0 Photoproduction
N. Sparks, V. Crede, A. V. Anisovich +57
Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector for photon energies between 0.92 and 1.68~GeV at the electron accelerator ELSA. The beam asymmetry~$…
In-medium mass from the reaction
TAPS Collaboration, M. Nanova, V. Metag +65
Data on the photoproduction of mesons on nuclei have been re-analyzed in a search for in-medium modifications. The data were taken with the Crystal Barrel(CB)/TAPS detector sy…
The new APD-Based Readout of the Crystal Barrel Calorimeter -- An Overview
TAPS Collaboration, C. Honisch, P. Klassen +47
The Crystal Barrel is an electromagnetic calorimeter consisting of 1380 CsI(Tl) scintillators, and is currently installed at the CBELSA/TAPS experiment where it is used to detect d…