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pro vyhledávání: '"Weidenmüller, Hans A."'
Autor:
Weidenmüller, Hans A.
For both reactions we use an approach similar to that of compound-nucleus reaction theory. For neutron-induced fission, we describe the compound system generated by absorption of the neutron and the nuclear system near the scission point as two stati
Externí odkaz:
http://arxiv.org/abs/2404.19355
Autor:
Weidenmüller, Hans A.
Publikováno v:
Phys. Rev. E 109, 034117 (2024)
Two quantum systems, each described as a random-matrix ensemble. are coupled to each other via a number of transition states. Each system is strongly coupled to a large number of channels. The average transmission probability is the product of three
Externí odkaz:
http://arxiv.org/abs/2311.08030
Autor:
Weidenmüller, Hans A.
Publikováno v:
J. Math. Phys. A: Math. Theor. 57 165001 (2024)
A closed quantum system thermalizes if for time $t \to \infty$, the function ${\rm Tr} (A \rho(t))$ tends asymptotically to ${\rm Tr} (A \rho_{\rm eq})$. Here $A$ is an operator that represents an observable, $\rho(t)$ is the time-dependent density m
Externí odkaz:
http://arxiv.org/abs/2310.03053
Autor:
Weidenmüller, Hans A.
Publikováno v:
J. Math. Phys. A: Math. Theor. 57 165002 (2024)
An isolated quantum system is said to thermalize if ${\rm Tr} (A \rho(t)) \to {\rm Tr} (A \rho_{\rm eq})$ for time $t \to \infty$. Here $\rho(t)$ is the time-dependent density matrix of the system, $\rho_{\rm eq}$ is the time-independent density matr
Externí odkaz:
http://arxiv.org/abs/2211.12165
Autor:
Budker, Dmitry, Berengut, Julian C., Flambaum, Victor V., Gorchtein, Mikhail, Jin, Junlan, Karbstein, Felix, Krasny, Mieczyslaw Witold, Litvinov, Yuri A., Pálffy, Adriana, Pascalutsa, Vladimir, Petrenko, Alexey, Surzhykov, Andrey, Thirolf, Peter G., Vanderhaeghen, Marc, Weidenmüller, Hans A., Zelevinsky, Vladimir
Publikováno v:
Annalen der Physik, 2100284 (2022)
The Gamma Factory (GF) is an ambitious proposal, currently explored within the CERN Physics Beyond Colliders program, for a source of photons with energies up to $\approx 400\,$MeV and photon fluxes (up to $\approx 10^{17}$ photons per second) exceed
Externí odkaz:
http://arxiv.org/abs/2106.06584
Autor:
Weidenmüller, Hans A.
Publikováno v:
J. Phys. A: Math. Theor. 55 (2022) 184001
Transport equations for autonomous driven Fermionic quantum systems are derived with the help of statistical assumptions and of the Markov approximation. The statistical assumptions hold if the system consists of subsystems within which equilibration
Externí odkaz:
http://arxiv.org/abs/2106.06305
This article is dedicated to the following class of problems. Start with an $N\times N$ Hermitian matrix randomly picked from a matrix ensemble - the reference matrix. Applying a rank-$t$ perturbation to it, with $t$ taking the values $1\le t \le N$,
Externí odkaz:
http://arxiv.org/abs/2008.09211
Publikováno v:
Phys. Rev. C 103, 044616 (2021)
The interaction between medium-weight nuclei and a strong zeptosecond laser pulse of MeV photons is investigated theoretically. Multiple absorption of photons competes with nuclear equilibration. We investigate the sudden regime. Here the rate of pho
Externí odkaz:
http://arxiv.org/abs/2005.04981
Publikováno v:
Phys. Rev. C 101, 034619 (2020)
Using the Brink-Axel hypothesis we derive the rate $R$ for nuclear dipole excitation by a laser pulse carrying $N \gg 1$ photons with average energy $\hbar \omega_0 \approx 5$ MeV. As expected $R \propto (\hbar \omega_0)^3$. The rate is also proporti
Externí odkaz:
http://arxiv.org/abs/1912.05991
Autor:
Weidenmüller, Hans A.
Publikováno v:
In: Discrete and Continuous Models in the Theory of Networks, Birkhaeuser Basel 2020
The spectral two-point function of chaotic quantum graphs is expected to be universal. Within the supersymmetry approach, a proof of that assertion amounts to showing that the contribution of non-universal (or massive) modes vanishes in the limit of
Externí odkaz:
http://arxiv.org/abs/1812.00655