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27 papers
Distribution of neutron resonance widths
Hans A. Weidenmueller
Recent data on neutron resonance widths indicate disagreement with the Porter-Thomas distribution (PTD). I discuss the theoretical arguments for the PTD, possible theoretical modif…
Correlation Widths in Quantum--Chaotic Scattering
B. Dietz, A. Richter, H. A. Weidenmueller
An important parameter to characterize the scattering matrix S for quantum-chaotic scattering is the width Gamma_{corr} of the S-matrix autocorrelation function. We show that the "…
Spectral fluctuation properties of constrained unitary ensembles of Gaussian-distributed random matrices
Z. Pluhar, H. A. Weidenmueller
We investigate the spectral fluctuation properties of constrained ensembles of random matrices (defined by the condition that a number N(Q) of matrix elements vanish identically; t…
Abundance of Ground States with Positive Parity
T. Papenbrock, H. A. Weidenmueller
We investigate analytically and numerically a random-matrix model for m fermions occupying l1 single-particle states with positive parity and l2 single-particle states with negativ…
Random-Matrix Approach to RPA equations. I
X. Barillier-Pertuisel, O. Bohigas, H. A. Weidenmueller
We study the RPA equations in their most general form by taking the matrix elements appearing in the RPA equations as random. This yields either a unitarily or an orthogonally inva…
Strong enhancement of the persistent current by an embedded quantum dot
E. H. Martins Ferreira, M. C. Nemes, H. A. Weidenmueller
This paper has been withdrawn by the authors due to crucial error on assumption in Eq. 2. We cannot assume v_R and v_L to be equal or even have the same sign.