Chiral three-nucleon forces and neutron matter (2009)
We calculate the properties of neutron matter and highlight the physics of chiral three-nucleon forces. For neutrons, only the long-range 2 pi-exchange interactions of the leading chiral...
Isospin-symmetry-breaking corrections to superallowed Fermi beta decay: Radial excitations (2009)
Based on an exact formalism, we study the effects of isospin-symmetry-breaking interactions on superallowed 0+ -> 0+ transitions. We calculate the second-order renormalization of the Fermi matrix...
Spin response of a normal Fermi liquid with noncentral interactions (2009)
We consider the spin response of a normal Fermi liquid with noncentral interactions under conditions intermediate between the collisionless and hydrodynamic regimes. This problem is of importance for...
Non-empirical pairing energy functional in nuclear matter and finite nuclei (2009)
Hebeler, K., Duguet, T., Lesinski, T., Schwenk, A.
We study 1S0 pairing gaps in neutron and nuclear matter as well as in finite nuclei on the basis of microscopic two-nucleon interactions. Special attention is paid to the consistency of the pairing...
Nuclear matter from chiral low-momentum interactions (2009)
Bogner, S. K., Furnstahl, R. J., Nogga, A., Schwenk, A.
Nuclear matter calculations based on low-momentum interactions derived from chiral nucleon-nucleon and three-nucleon effective field theory interactions and fit only to few-body data predict...
Nuclei and chiral dynamics (2009)
Nuclear theory has entered an exciting era. This is due to advances on many fronts, including the development of effective field theory and the renormalization group for nuclear forces, advances in...
Helium halo nuclei from low-momentum interactions (2009)
Bacca, S., Schwenk, A., Hagen, G., Papenbrock, T.
We present ground-state energies of helium halo nuclei based on chiral low-momentum interactions, using the hyperspherical-harmonics method for 6He and coupled-cluster theory for 8He, with correct...
Unified approach to structure factors and neutrino processes in nucleon matter (2008)
Lykasov, G. I., Pethick, C. J., Schwenk, A.
We present a unified approach to neutrino processes in nucleon matter based on Landau's theory of Fermi liquids that includes one- and two-quasiparticle-quasihole pair states as well as mean-field...
Influence of light nuclei on neutrino-driven supernova outflows (2008)
Arcones, A., Martinez-Pinedo, G., O'Connor, E., Schwenk, A., Janka, H. -Th., Horowitz, C. J., ...
We study the composition of the outer layers of a protoneutron star and show that light nuclei are present in substantial amounts. The composition is dominated by nucleons, deuterons, tritons and...
We study the formalism to include isospin-symmetry-breaking corrections when extracting the up-down Cabibbo-Kobayashi-Maskawa matrix element from superallowed 0+ -> 0+ nuclear beta decay. We show...
Three-nucleon interactions: A frontier in nuclear structure (2008)
Three-nucleon interactions are a frontier in understanding and predicting the structure of strongly-interacting matter in laboratory nuclei and in the cosmos. We present results and discuss the...
Block Diagonalization using SRG Flow Equations (2008)
Anderson, E., Bogner, S. K., Furnstahl, R. J., Jurgenson, E. D., Perry, R. J., Schwenk, A.
By choosing appropriate generators for the Similarity Renormalization Group (SRG) flow equations, different patterns of decoupling in a Hamiltonian can be achieved. Sharp and smooth block-diagonal...
Neutron matter at finite temperature (2007)
Tolos, L., Friman, B., Schwenk, A.
We calculate the neutron matter equation of state at finite temperature based on low-momentum two- and three-nucleon interactions. The free energy is obtained from a loop expansion around the...
Comment on "Ab Initio study of 40-Ca with an importance-truncated no-core shell model" (2007)
Dean, D. J., Hagen, G., Hjorth-Jensen, M., Papenbrock, T., Schwenk, A.
In a recent Letter [Phys. Rev. Lett. 99, 092501 (2007)], Roth and Navratil present an importance-truncation scheme for the no-core shell model. The authors claim that their truncation scheme leads to...
Convergence in the no-core shell model with low-momentum two-nucleon interactions (2007)
Bogner, S. K., Furnstahl, R. J., Maris, P., Perry, R. J., Schwenk, A., Vary, J. P.
The convergence of no-core shell model (NCSM) calculations using renormalization group evolved low-momentum two-nucleon interactions is studied for light nuclei up to Li-7. Because no additional...
Benchmark calculations for 3H, 4He, 16O and 40Ca with ab-initio coupled-cluster theory (2007)
Hagen, G., Dean, D. J., Hjorth-Jensen, M., Papenbrock, T., Schwenk, A.
We present ab-initio calculations for 3H, 4He, 16O, and 40Ca based on two-nucleon low-momentum interactions Vlowk within coupled-cluster theory. For 3H and 4He, our results are within 70 keV and 10...
Coupled-cluster theory for three-body Hamiltonians (2007)
Hagen, G., Papenbrock, T., Dean, D. J., Schwenk, A., Nogga, A., Wloch, M., ...
We derive coupled-cluster equations for three-body Hamiltonians. The equations for the one- and two-body cluster amplitudes are presented in a factorized form that leads to an efficient numerical...
Resonant relativistic corrections and the A_y problem (2007)
We study relativistic corrections to nuclear interactions caused by boosting the two-nucleon interaction to a frame in which their total momentum does not vanish. These corrections induce a change in...
Neutrino Breakup of A=3 Nuclei in Supernovae (2007)
O'Connor, E., Gazit, D., Horowitz, C. J., Schwenk, A., Barnea, N.
We extend the virial equation of state to include 3H and 3He nuclei, and predict significant mass-three fractions near the neutrinosphere in supernovae. While alpha particles are often more abundant,...
Are low-energy nuclear observables sensitive to high-energy phase shifts? (2007)
Bogner, S. K., Furnstahl, R. J., Perry, R. J., Schwenk, A.
Conventional nucleon-nucleon potentials with strong short-range repulsion require contributions from high-momentum wave function components even for low-energy observables such as the deuteron...
Wielage, B., Grund, T., Nebelung, M., Thiele, S., Wank, A., Schwenk, A.
The combination of excellent mechanical, thermal and chemical properties of silicon carbide (SiC) ant titanium carbide (TiC) has made these materials very attractive both for structural ceramics...
Schwenk, A., Wank, A., Bobzin, K., Ernst, F., Schmitt, R., Dören, J., ...
Der Prozess des thermischen Beschichtens ist für die spätere Produktqualität enorm wichtig. Die Prüfung auf Fehler der Schichten kann oftmals nur mit Hilfe einer zerstörenden Materialprüfung...
Three-fermion problems in optical lattices (2006)
We present exact results for the spectra of three fermionic atoms in a single well of an optical lattice. For the three lowest hyperfine states of Li6 atoms, we find a Borromean state across the...
The Neutrino Response of Low-Density Neutron Matter from the Virial Expansion (2006)
We generalize our virial approach to study spin-polarized neutron matter and the consistent neutrino response at low densities. In the long-wavelength limit, the virial expansion makes...
Convergence of the Born Series with Low-Momentum Interactions (2006)
Bogner, S. K., Furnstahl, R. J., Ramanan, S., Schwenk, A.
The nonperturbative nature of nucleon-nucleon interactions as a function of a momentum cutoff is studied using Weinberg eigenvalues as a diagnostic. This investigation extends an earlier study of the...
Modern topics in theoretical nuclear physics (2005)
Over the past five years there have been profound advances in nuclear physics based on effective field theory and the renormalization group. In this brief, we summarize these advances and discuss how...
The Virial Equation of State of Low-Density Neutron Matter (2005)
We present a model-independent description of low-density neutron matter based on the virial expansion. The virial equation of state provides a benchmark for all nuclear equations of state at...
Cluster Formation and The Virial Equation of State of Low-Density Nuclear Matter (2005)
We present the virial equation of state of low-density nuclear matter composed of neutrons, protons and alpha particles. The virial equation of state is model-independent, and therefore sets a...
Resonant Fermi gases with a large effective range (2005)
We calculate the equation of state of a Fermi gas with resonant interactions when the effective range is appreciable. Using an effective field theory for large scattering length and large effective...
Is nuclear matter perturbative with low-momentum interactions? (2005)
Bogner, S. K., Schwenk, A., Furnstahl, R. J., Nogga, A.
The nonperturbative nature of inter-nucleon interactions is explored by varying the momentum cutoff of a two-nucleon potential. Conventional force models, which have large cutoffs, are...
VISUALIZATION AND ART IN THE MATHEMATICS CLASSROOM (2002)
János Karsai, Éva Veronika Rácz, Angela Schwenk, Norbert Kalus, J. Karsai, É. Rácz, ...
Abstract. In this paper we summarize our concepts and practice on computer-aided mathematical experimentation, and illustrate them by Mathematica projects that we have developed for our research and...
Towards a Model-Independent Low Momentum Nucleon-Nucleon Interaction (2001)
Bogner, S. K., Kuo, T. T. S., Schwenk, A., Entem, D. R., Machleidt, R.
We provide evidence for a high precision model-independent low momentum nucleon-nucleon interaction. Performing a momentum-space renormalization group decimation, we find that the effective...
Schwenk, A, Breuer, P, Kremer, G, Ward, L
Background Diagnosis of the HIV-associated lipodystrophy syndrome is based on clinical assessment, in lack of a consensus about case definition and reference methods. Three bedside methods were...
Schwenk, A, Breuer, P, Kremer, G, Ward, L
Background Diagnosis of the HIV-associated lipodystrophy syndrome is based on clinical assessment, in lack of a consensus about case definition and reference methods. Three bedside methods were...
Schwenk, A, Eschner, W., Kremer, G, Ward, L. C.
.:Abstract-Objective: Bioelectrical impedance analysis (BIA) is widely used as bedside assessment of body composition. Body cell mass (BCM) and intracellular water (ICW) are clinically important body...
Schwenk, A, Eschner, W., Kremer, G, Ward, L. C.
.:Abstract-Objective: Bioelectrical impedance analysis (BIA) is widely used as bedside assessment of body composition. Body cell mass (BCM) and intracellular water (ICW) are clinically important body...
Guillain-Barre syndrome in a patient with non-Hodgkin's lymphoma (2000)
Re, D., Schwenk, A., Hegener, P., Bamborschke, S., Diehl, V., Tesch, H.
We describe a case of Guillain-Barré syndrome (GBS) in a patient with non-Hodgkin's lymphoma (NHL). A 21-year-old woman with a newly diagnosed stage IV high-grade lymphoma (precursor T-cell NHL...
Bioelectrical impedance analysis predicts outcome in patients with suspected bacteremia (1998)
Schwenk, A, Ward, LC, Elia, M, Scott, GM
Fluid shifts from intracellular to extracellular water (ICW to ECW) are a feature of sepsis, caused by increased vascular permeability and cell catabolism. Changes in ECW and total body water (TBW)...
Bioelectrical impedance analysis predicts outcome in patients with suspected bacteremia (1998)
Schwenk, A, Ward, LC, Elia, M, Scott, GM
Fluid shifts from intracellular to extracellular water (ICW to ECW) are a feature of sepsis, caused by increased vascular permeability and cell catabolism. Changes in ECW and total body water (TBW)...
Nuclear Data, Cross Section Libraries and their Application in Nuclear Technology : KTG/ENS Internat.State of the Art Seminar, Bonn, October 1-2, 1985 Proc.