Conveners
Session IV
- Michael Jentschel
Session IV
- Vincent Bagnoud
Session IV
- Myung-Ki Cheoun (Department of Physics, Soongsil University,)
Photon-induced fission provides a mechanism for studying fission stimulated via the theoretically well understood electromagnetic interaction. The lack of hadronic processes in the entrance channel limit the angular momentum transferred to the excited nucleus prior to fission to typically 1 unit, i.e. either an electric or magnetic dipole excitation. We have performed extensive double...
Measurements of photofission cross sections utilizing quasimonoenergetic $\gamma$-ray beams historically rely on neutron detection, producing photoneutron data that must be sorted into the relevant reaction channels: ($\gamma$,n), ($\gamma$,2n), ($\gamma$,3n), and ($\gamma$,f). This deconvolution is a model-dependent process that has led to longstanding systematic discrepancies in photonuclear...
Electromagnetic excitations (primarily M1 and E2) of heavy deformed nuclei, such as $^{154}$Sm, $^{166}$Er, etc., with excitation energies $E_x=2-4$ MeV will be discussed in terms of the most advanced Monte Carlo Shell Model (MCSM) calculations. For M1 excitations, the recent MCSM result indicates M1 spectrum very close to experimental ones, but we also see strong spin contributions. Such...
The availability of nuclear structure information on transuranium actinides has a direct impact on the modeling of stellar nucleosynthesis and supports isotope-selective material inspection via photonuclear reactions. However, experimental data in this region are still scarce.
The first nuclear resonance fluorescence (NRF) experiment on $^{242}$Pu was conducted at the S-DALINAC at TU...
Intense lasers enable a range of schemes for generating high-energy particle beams in university-scale laboratories. In direct laser acceleration (DLA), the leading edge of the laser pulse ionizes the target material, forming a positively charged plasma channel that traps and accelerates electrons. DLA offers exceptional conversion efficiency — often exceeding 20% — making it highly suitable...
Excitation of long-lived states in bromine nuclei using a table-top laser-plasma accelerator providing pulsed (<100 fs) electron beams provided a sensitive probe of gamma strength and level densities in the nuclear quasicontinuum, and may indicate angular momentum coupling through electron-nuclear interactions. Solid-density LaBr$_{3}$ active targets absorb real and virtual photons up to 35 ±...
Broadband MeV to multi-GeV 10 PW laser-driven gamma-rays generation, characterization and possible applications
V. Lelasseux1, P. Ghenuche$^1$, V.L.J. Phung$^1$, H. Ahmed$^2$, D.L. Balabanski$^1$, M.O. Cernaianu$^1$, D. Choudhury$^{1,3}$, S. Corde$^{4,5}$, F. D’Souza$^{1,6}$, M. Gugiu$^1$, V. Iancu$^1$, S. Krishnamurty$^7$, I. Kargapolov$^7$, L. Lancia$^8$, G. Lorusso$^9$, A. Leblanc$^4$,...
Recent advancements in laser-based particle acceleration technologies have opened new possibilities for conducting nuclear reaction studies at tabletop scales. Among various laser-based nuclear reaction experiments, this research focuses on the pitcher-catcher configuration utilizing laser-driven ion beams.
Typically, nuclear reaction rates in equilibrium plasmas, such as astrophysical...
This work focuses on the experimental characterization of a neutron source driven by the high-energy (between 300 and 700 J), short pulse (700 fs) LMJ-PETAL facility. For this purpose, we have developed two experimental platforms, both operating in a pitcher-catcher configuration [1], but using either a solid target or a gas plasma to generate the primary high-energy particle beam.
Our first...
Low energy neutron (thermal neutron) sources are widely used in various fields such as neutron radiography, neutron diffraction, and Boron Neutron Capture Therapy (BNCT). Spin-polarized neutrons are also considered as one of the next generation quantum sources, enabling analysis of magnetic structures of materials. Laser-driven neutron sources are considered promising due to their point source...
Quantum field theory predicts a nonlinear response of the vacuum to strong electromagnetic fields of macroscopic extent. This fundamental tenet has remained experimentally challenging and is yet to be tested in the laboratory. A particularly distinct signature of the resulting optical activity of the quantum vacuum is vacuum birefringence manifesting itself in a polarization-flipped signal...
