22 Result(s)

Article

An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab

Positron beams, both polarized and unpolarized, are identified as important ingredients for the experimental programs at the next generation of lepton accelerators. In the context of the hadronic physics progr...

A. Accardi, A. Afanasev, I. Albayrak, S. F. Ali… in The European Physical Journal A (2021)

Article

Overview of Recent Model Calculations of Single Spin Asymmetries

Over the past years a lot of progress has been made in the understanding of single spin asymmetries in hard scattering processes. We briefly review this subject, covering the non-vanishing of time-reversal odd...

A. Metz in Few-Body Systems (2005)

Article

Twist-3 single-spin asymmetries in semi-inclusive deep-inelastic scattering

The single-spin asymmetries for a longitudinally polarized lepton beam or a longitudinally polarized nucleon target in semi-inclusive deep-inelastic scattering are twist-3 observables. We study these asymmetri...

A. Metz, M. Schlegel in The European Physical Journal A - Hadrons and Nuclei (2004)

Article

Detailed spectroscopy of superdeformed actinide nuclei

Progress in the experimental techniques used to investigate superdeformed fission isomers in the actinides allowed for detailed spectroscopic results of collective properties as well as for the identification ...

P. G. Thirolf, D. Gassmann, D. Habs… in Acta Physica Hungarica A) Heavy Ion Physics (2003)

Article

Supersymmetry in the spectra of complex atomic nuclei

Evidence is observed for the existence of supersymmetry from the study of the odd-odd nucleus ¹⁹⁶Au using the ¹⁹⁷Au( \(\vec d\) ...

G. Graw, A. Metz, R. Hertenberger, Y. Eisermann… in Czechoslovak Journal of Physics (2002)

Article

Towards complete spectroscopy of ¹⁹³Os

Strong evidence for the existence of supersymmetry in atomic nuclei has been found in the quartet of nuclei ^194,195Pt, ^195,196Au [1–3]. Our attention is now focused a second quartet of nuclei, that is ^193,194Ir,

Y. Eisermann, G. Graw, A. Metz, R. Hertenberger… in Czechoslovak Journal of Physics (2002)

Article

Dispersion relation formalism for virtual Compton scattering off the proton

We present in detail a dispersion relation formalism for virtual Compton scattering (VCS) off the proton from threshold into the Δ(1232)-resonance region. Such a formalism can be used as a tool to extract the ...

B. Pasquini, M. Gorchtein, D. Drechsel… in The European Physical Journal A - Hadrons … (2001)

Article

Hyperdeformation and clusterization in the actinide region

The ²³³U(d,pf)²³⁴U, and the ²³⁵U(d,pf)²³⁶U reactions have been studied with high energy resolution. The observed fission resonances were described as members of rotational bands with rotational parameters charact...

A. Krasznahorkay, D. Habs, M. Hunyadi, D. Gassmann, M. Csatlós… in Acta Physica Hungarica (2001)

Article

Experiments on the Magnetism of Sc Implanted into Metals

The study of dilute Sc impurities in either heavier d-transition metals or in alkali metal hosts is difficult due to their limited solubility; however, the large host-impurity mismatch in these systems makes them...

T. Funk, W. D. Brewer, J. Kapoor, A. Metz, D. Riegel in Hyperfine Interactions (2001)

Article

Detailed spectroscopy in the superdeformed second minimum of ²⁴⁰Pu

Spectroscopic studies in the superdeformed shape isomer of ²⁴⁰Pu using γ-spectroscopy, conversion electron spectroscopy and transmission resonance spectroscopy have been performed. In a high-resolution and high-e...

P. G. Thirolf, D. Gassmann, D. Habs, M. J. Chromik, Y. Eisermann… in Acta Physica Hungarica (2001)

Article

Semi-exclusive production of photons at HERA

We study the feasibility of measuring the semi-exclusive photon production \(\gamma + p \to \gamma + Y\) at HERA. The cross section of photons produced at large transverse momen...

P. Hoyer, M. Maul, A. Metz in The European Physical Journal C - Particles and Fields (2000)

Article

Soft and hard Pomeron in the structure function of the proton at low x and low \(Q^2\)

We study inclusive electroproduction on the proton at low x and low \(Q^2\) using a soft and a hard Pomeron. The contribution of the soft Pomeron is based on the Stochastic Vacu...

U. D'Alesio, A. Metz, H.J. Pirner in The European Physical Journal C - Particles and Fields (1999)

Chapter and Conference Paper

Dispersion Theoretical Analysis of the Nucleon Spin Polarizabilities

The spin polarizabilities of the nucleon have been calculated from pion photoproduction data using forward dispersion relations. The feasibility of an experimental determination of these structure constants is...

B. Pasquini, D. Drechsel, G. Krein, A. Metz in N* Physics and Nonperturbative Quantum Chr… (1999)

Chapter and Conference Paper

Working group on hadron polarizabilities and form factors

D. Drechsel, J. Becker, A. Z. Dubničková… in Chiral Dynamics: Theory and Experiment (1998)

Article

Generalized polarizabilities of the nucleon studied in the linear sigma model (II)

In a previous paper virtual Compton scattering off the nucleon has been investigated in the one-loop approximation of the linear sigma model in order to determine the 3 scalar generalized polarizabilities. We ...

A. Metz, D. Drechsel in Zeitschrift für Physik A Hadrons and Nuclei (1997)

Article

Generalized polarizabilities of the nucleon studied in the linear sigma model

The generalized polarizabilities of the nucleon have been calculated in the one-loop approximation of the linear sigma model in the limit of infinite sigma mass. In particular, we have investigated the spin-in...

A. Metz, D. Drechsel in Zeitschrift für Physik A Hadrons and Nuclei (1996)

Article

Hyperfine induced magnetic order in Pr: Neutron diffraction at mK temperatures

With elastic neutron scattering we investigated the magnetic reflections of a single crystal of pure Pr in the temperature range down to 8 mK. We found a double peak structure consisting of a narrow antiferrom...

B. Schröder-Smeibidl, A. Metz, M. Manns, M. Steiner… in Czechoslovak Journal of Physics (1996)

Article

Generalized polarizabilities of the nucleon studied in the linear sigma model

The generalized polarizabilities of the nucleon have been calculated in the one-loop approximation of the linear sigma model in the limit of infinite sigma mass. In particular, we have investigated the spin-in...

A. Metz, D. Drechsel in Zeitschrift für Physik A Hadrons and nuclei (1996)