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Publications (38)

nucl-ex2015

Measurement of double polarisation asymmetries in $I ¨ $ -photoproduction

H. Eberhardt, T. C. Jude, H. Schmieden +72

The first measurements of the beam-target-helicity-asymmetries $E$ and $G$ in the photoproduction of $I ¨ $ -mesons off protons at the CBELSA/TAPS experiment are reported. $E$ ( $G$ ) w…

nucl-ex2015

High statistics study of the reaction $I^^{3} p \to p 2 I ¨ ^{0}$

V. Sokhoyan, E. Gutz, V. Crede +62

The photoproduction of 2 $I ¨ ^{0}$ 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…

physics.ins-det2024

$I ¨ $ SPECT: A spin-flip loaded magnetic ultracold neutron trap for a determination of the neutron lifetime

J. Auler, M. Engler, K. Franz +13

The confinement of ultracold neutrons (UCNs) in a three dimensional magnetic field gradient trap allows for a measurement of the free neutron lifetime with superior control over sp…

hep-lat2002

The QCD phase transition at high temperature and low density

S. Ejiri, C. R. Allton, S. J. Hands +4

We study the thermal properties of QCD in the presence of a small quark chemical potential $I^¼$ . Derivatives of the phase transition point with respect to $I^¼$ are computed at $Î¼=…

nucl-ex2014

First measurement of the helicity asymmetry for $I^^{3} p \to p I ¨ ^{0}$ 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…

hep-lat2005

QCD at non-zero temperature and density from the lattice

C. R. Allton, S. Ejiri, S. J. Hands +4

The study of systems as diverse as the cores of neutron stars and heavy-ion collision experiments requires the understanding of the phase structure of QCD at non-zero temperature,…

cond-mat.supr-con2009

Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines

T. A. Prikhna, W. Gawalek, Ya. M. Savchuk +27

Materials of the Y-Ba-Cu-O (melt-textured YBa2Cu3O7-d-based materials or MT-YBCO) and Mg-B-O (MgB2-based materials) systems with high superconducting performance, which can be atta…

nucl-ex2014

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 $I^^{3} p \to p I ¨ ^{0}$ are reported. The results are extracted from azimuthal asymmetries when a transversely polariz…

nucl-ex2012

Transparency ratio in Î³A -> Î·' A' and the in-medium Î·' width

M. Nanova, V. Metag, A. Ramos +58

The photoproduction of Î·'-mesons off different nuclei has been measured with the CBELSA/TAPS detector system for incident photon energies between 1500 - 2200 MeV. The transparency…

nucl-ex2008

Modification of the $I ¨ $ -Meson Lifetime in Nuclear Matter

M. Kotulla, D. Trnka, P. MÃ¼hlich +65

The photo production of $I ¨ $ 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…

nucl-ex2012

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…

hep-lat2002

The QCD thermal phase transition in the presence of a small chemical potential

C. R. Allton, S. Ejiri, S. J. Hands +5

We propose a new method to investigate the thermal properties of QCD with a small quark chemical potential $I^¼$ . Derivatives of the phase transition point with respect to $I^¼$ are…

nucl-ex2011

Photoproduction of $I ¨ $ mesons on nuclei near the production threshold

M. Nanova, J. Weil, S. Friedrich +67

The photoproduction of $I ¨ $ 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 $I ¨ $ line shape does…

nucl-ex2011

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 $I^^{3} + p \to K^{0} + I^£^{+}$ photoproduction reaction is investigated in the energy region from threshold to $E_{I^}^{3} = 2250$ \,MeV. The differential cross section exhibits increa…

nucl-ex2021

Observation of a structure in the M $_{p I^\cdot}$ invariant mass distribution near 1700 MeV/ $c^{2}$ in the $I^^{3} p \to p I ¨ ^{0} I^\cdot$ reaction

V. Metag, M. Nanova, J. Hartmann +74

The reaction $I^^{3} p \to p I ¨ ^{0} I^\cdot$ has been studied with the CBELSA/TAPS detector at the electron stretcher accelerator ELSA in Bonn for incident photon energies from thresho…

cond-mat.supr-con2003

High-pressure synthesis of MgB2 with addition of Ti

T. A. Prikhna, W. Gawalek, Ya. M. Savchuk +11

The MgB2 - based material high-pressure synthesized at 2 GPa and 800 C for 1 h from Mg and B (taken in the stoichiometry ratio of MgB2) with addition of 2-10 wt% of Ti demonstrated…

nucl-ex2019

Measurement of the Helicity Asymmetry $E$ for the reaction $I^^{3} p \to I ¨ ^{0} p$

TAPS collaboration, M. Gottschall, F. Afzal +66

A measurement of the double-polarization observable $E$ for the reaction $I^^{3} p \to I ¨ ^{0} p$ is reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility in Bo…

nucl-ex2018

The Î·'-carbon potential at low meson momenta

M. Nanova, S. Friedrich, V. Metag +58

The production of $I^\cdot^{'}$ mesons in coincidence with forward-going protons has been studied in photon-induced reactions on $^{12}$ C and on a liquid hydrogen (LH $_{2}$ ) target for…

hep-lat2001

Common features of deconfining and chiral critical points in QCD and the three state Potts model in an external field

F. Karsch, Ch. Schmidt, S. Stickan

In the presented study we investigated the second order endpoints of the lines of first order phase transitions which emerge for the QCD in the heavy and light quark mass regime an…

cond-mat.supr-con2010

Effects of high pressure on the physical properties of MgB2

T. Prikhna, W. Gawalek, Ya. Savchuk +27

The synthesis of MgB2-based materials under high pressure gave the possibility to suppress the evaporation of magnesium and to obtain near theoretically dense nanograined structure…

cond-mat.supr-con2009

Inhomogeneity of Magnesium Diboride Structure and its Effect on Critical Current Density

T. Prikhna, W. Gawalek, Ya. Savchuk +19

The influence of the oxygen segregation into Mg-B-O inclusions (which are oxygen enriched as compared to the matrix material) and the formation of boron enriched phases (with near…

hep-lat2001

The Chiral Critical Point in 3-Flavour QCD

F. Karsch, E. Laermann, Ch. Schmidt

We determine the second order endpoint of the line of first order phase transitions, which occur in the light quark mass regime of 3-flavour QCD at finite temperature, and analyze…

hep-lat2002

The quark mass and $I^¼$ dependence of the QCD chiral critical point

Ch. Schmidt, C. R. Allton, S. Ejiri +4

In order to study the QCD chiral critical point we investigate Binder Cumulants of the chiral condensate. The results were obtained from simulations of 3 and 2+1 flavors of standar…

hep-ph2002

QCD at non-zero chemical potential and temperature from the lattice

C. R. Allton, S. Ejiri, S. J. Hands +5

A study of QCD at non-zero chemical potential, mu, and temperature, T, is performed using the lattice technique. The transition temperature (between the confined and deconfined pha…

hep-lat2001

The Chiral Critical Point in 3-Flavour QCD

Ch. Schmidt, K. Karsch, E. Laermann

We determine the second order endpoint of the line of first order phase transitions, which occur in the light quark mass regime of 3-flavour QCD at finite temperature, and analyze…

nucl-ex2016

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 $I ¨ ^{0}$ photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bon…

nucl-ex2016

Momentum dependence of the imaginary part of the $I ¨ $ - and $I^\cdot^{'}$ -nucleus optical potential

S. Friedrich, M. Nanova, V. Metag +57

The photoproduction of $I ¨ $ and $I^\cdot^{'}$ 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…

nucl-ex2014

Experimental constraints on the $I ¨ $ -nucleus real potential

S. Friedrich, K. Makonyi, V. Metag +61

In a search for $I ¨ $ mesic states, the production of $I ¨ $ -mesons in coincidence with forward going protons has been studied in photon induced reactions on $^{12}$ C for incident pho…

hep-lat2000

Flavor and Quark Mass Dependence of QCD Thermodynamics

F. Karsch, E. Laermann, A. Peikert +2

We calculate the transition temperature in 2 and 3-flavor QCD using improved gauge and staggered fermion actions on lattices with temporal extent Nt=4. We find Tc=173(8)MeV and 154…

nucl-ex2013

Determination of the Î·'-nucleus optical potential

M. Nanova, V. Metag, E. Ya. Paryev +59

The excitation function and momentum distribution of $I^\cdot^{'}$ mesons have been measured in photon induced reactions on $^{12}$ C in the energy range of 1250-2600 MeV. The exper…

cond-mat.supr-con2001

The high-pressure synthesis of MgB2

T. A. Prikhna, W. Gawalek, A. B. Surzhenko +12

The high-pressure synthesis is one of the most promising methods to produce MgB2 superconductive (SC) material. The available high-pressure apparatuses have working volume up to 10…

nucl-ex2017

Photoproduction of eta mesons from the neutron: cross sections and double polarization observable E

L. Witthauer, M. Dieterle, F. Afzal +70

Photoproduction of $I^\cdot$ mesons from neutrons} \abstract{Results from measurements of the photoproduction of $I^\cdot$ mesons from quasifree protons and neutrons are summarized. The expe…

nucl-ex2025

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 $I^^{3} p \to p I ¨ ^{0} I ¨ ^{0}$ are reported. The data were taken with the CBELSA/TAPS experiment at the…

hep-lat2000

QCD Thermodynamics with 2 and 3 Quark Flavors

F. Karsch, E. Laermann, A. Peikert +2

We discuss the flavor dependence of the pressure and critical temperature calculated in QCD with 2, 2+1 and 3 flavors using improved gauge and staggered fermion actions on lattices…

nucl-ex2015

The polarization observables T, P, and H and their impact on $I^^{3} p \to p I ¨ ^{0}$ multipoles

J. Hartmann, H. Dutz, A. V. Anisovich +76

Data on the polarization observables T, P, and H for the reaction $I^^{3} p \to p I ¨ ^{0}$ are reported. Compared to earlier data from other experiments, our data are more precise and extend…

nucl-ex2010

In-medium $I ¨ $ mass from the $I^^{3} + N b \to I ¨ ^{0} I^^{3} + X$ reaction

TAPS Collaboration, M. Nanova, V. Metag +65

Data on the photoproduction of $I ¨ $ 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…

cond-mat.supr-con2002

Synthesis and Sintering of MgB2 Under High Pressure

T. A. Prikhna, Ya. M. Savchuk, N. V. Sergienko +11

High-pressure (HP) synthesis and sintering are promising methods for manufacturing of the bulk MgB2 superconductive material. The available high-pressure apparatuses with 100 cm3 w…

nucl-ex2010

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…

Publications (38)

Measurement of double polarisation asymmetries in I¨-photoproduction

High statistics study of the reaction I^3p→p2I¨0

I¨SPECT: A spin-flip loaded magnetic ultracold neutron trap for a determination of the neutron lifetime

The QCD phase transition at high temperature and low density

First measurement of the helicity asymmetry for I^3p→pI¨0 in the resonance region

QCD at non-zero temperature and density from the lattice

Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines

The N(1520) 3/2- helicity amplitudes from an energy-independent multipole analysis based on new polarization data on photoproduction of neutral pions

Transparency ratio in Î³A -> Î·' A' and the in-medium Î·' width

Modification of the I¨-Meson Lifetime in Nuclear Matter

Well-established nucleon resonances revisited by double-polarization measurements

The QCD thermal phase transition in the presence of a small chemical potential

Photoproduction of I¨ mesons on nuclei near the production threshold

Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold

Observation of a structure in the MpI^⋅​ invariant mass distribution near 1700 MeV/c2 in the I^3p→pI¨0I^⋅ reaction

High-pressure synthesis of MgB2 with addition of Ti

Measurement of the Helicity Asymmetry E for the reaction I^3p→I¨0p

The Î·'-carbon potential at low meson momenta

Common features of deconfining and chiral critical points in QCD and the three state Potts model in an external field

Effects of high pressure on the physical properties of MgB2

Inhomogeneity of Magnesium Diboride Structure and its Effect on Critical Current Density

The Chiral Critical Point in 3-Flavour QCD

The quark mass and I^¼ dependence of the QCD chiral critical point

QCD at non-zero chemical potential and temperature from the lattice

The Chiral Critical Point in 3-Flavour QCD

Double-polarization observable G in neutral-pion photoproduction off the proton

Momentum dependence of the imaginary part of the I¨- and I^⋅′-nucleus optical potential

Experimental constraints on the I¨-nucleus real potential

Flavor and Quark Mass Dependence of QCD Thermodynamics

Determination of the Î·'-nucleus optical potential

The high-pressure synthesis of MgB2

Photoproduction of eta mesons from the neutron: cross sections and double polarization observable E

Polarization observables in double neutral pion photoproduction

QCD Thermodynamics with 2 and 3 Quark Flavors

The polarization observables T, P, and H and their impact on I^3p→pI¨0 multipoles

In-medium I¨ mass from the I^3+Nb→I¨0I^3+X reaction

Synthesis and Sintering of MgB2 Under High Pressure

Photoproduction of meson pairs: First measurement of the polarization observable I^s

Measurement of double polarisation asymmetries in $I ¨ $ -photoproduction

High statistics study of the reaction $I^^{3} p \to p 2 I ¨ ^{0}$

$I ¨ $ SPECT: A spin-flip loaded magnetic ultracold neutron trap for a determination of the neutron lifetime

First measurement of the helicity asymmetry for $I^^{3} p \to p I ¨ ^{0}$ in the resonance region

Modification of the $I ¨ $ -Meson Lifetime in Nuclear Matter

Photoproduction of $I ¨ $ mesons on nuclei near the production threshold

Observation of a structure in the M $_{p I^\cdot}$ invariant mass distribution near 1700 MeV/ $c^{2}$ in the $I^^{3} p \to p I ¨ ^{0} I^\cdot$ reaction

Measurement of the Helicity Asymmetry $E$ for the reaction $I^^{3} p \to I ¨ ^{0} p$

The quark mass and $I^¼$ dependence of the QCD chiral critical point

Momentum dependence of the imaginary part of the $I ¨ $ - and $I^\cdot^{'}$ -nucleus optical potential

Experimental constraints on the $I ¨ $ -nucleus real potential

The polarization observables T, P, and H and their impact on $I^^{3} p \to p I ¨ ^{0}$ multipoles

In-medium $I ¨ $ mass from the $I^^{3} + N b \to I ¨ ^{0} I^^{3} + X$ reaction