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Polarization REsearch for Fusion Experiments and Reactors - The PREFER collaboration: aims, goals and present status
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Direct mass measurement of and implications for the isomer structures in : Tracing the two-proton decay branch
No full textFirst polarisation measurement of coherently photoproduced J/ in ultra-peripheral PbPb collisions at = 5.02 TeV
No full textGSI-2026-0020
Comprehensive survey of hybrid equations of state in neutron star mergers and constraints on the hadron-quark phase transition
No full textApplication of Linear and Non-Linear Constraints in a Brute-Force-Based Alignment Approach for CBM
No full textThe Compressed Baryonic Matter (CBM) experiment at FAIR will operate at interaction rates up to 10 MHz, generating data streams averaging 500 GB/s. This necessitates efficient online reconstruction capabilities, particularly for the Silicon Tracking System (STS), which is the key detector for track reconstruction and contributes a large fraction of the expected data volume. We present a GPU-accelerated hit reconstruction chain for the STS that achieves a 128 speedup over the sequential CPU implementation. The implementation features optimized data structures reducing memory footprint, parallel algorithms for sorting, cluster finding, and hit reconstruction, and portability across GPU architectures. Our custom merge sort outperforms library implementations by 10 % while using 33 % less memory. Cluster finding employs a twophase approach with atomic operations for thread-safe connections between signal clusters. Even before GPU acceleration, algorithmic improvements provide a 3 speedup in single-threaded execution. Both NVIDIA and AMD GPUs achieve comparable performance of approximately 0.12 s on a timeframe containing 1000 Au+Au events. The reconstruction chain was successfully deployed during the May 2024 mCBM beamtime, processing data rates up to 2.4 GB/s in real-time, demonstrating its viability for CBM’s triggerless data acquisition approach
First Measurement of the Quadrupole Moment of the State in
No full textThe Sn isotopic chain, exhibiting double shell closures at 100 Sn and 132 Sn , is a key testing ground for theoretical models of the atomic nucleus. It was originally predicted that the transitional matrix elements between the first 2+ state and the 0+ ground state for the even-even isotopes in this chain should show a simple dependence on the neutron number. This prediction was, however, disproven experimentally in some of the first experiments with postaccelerated radioactive beams, a situation that has remained unresolved ever since. Subsequent theoretical work has suggested that the explanation can be found in proton excitations across the =50 shell gap, with an accompanying experimental signature that the first excited 2+ state in 110 Sn should have a distinct oblate shape. In this Letter, we present the first measurements of the spectroscopic quadrupole moment of the 2+1 state, (2;4+1→2+1) and (2;4+2→2+1) values for 110 Sn , as well as the (2;2+1→0+1) value with significantly improved precision compared to previous results. From the same experiment, half-lives of the 2+1 and 4+1 states were measured using the Doppler shift attenuation method. Our combined result, (2+1)=20(8) efm2 for 110 Sn , is the largest positive value known among the Sn isotopes, indicating an oblate shape of the state by more than 2. Comparison of the 2 transition strengths and quadrupole moments with recent shell model calculations are presented
Beta-decay study of
No full textThis work reports on new experimental information regarding the beta decay In-101 -> Cd-101, obtained with the DESPEC set-up within the FAIR Phase-0 campaign in the year 2021. A first tentative assignment of I-beta and logft values is provided. The results are compared to large-scale shell-model calculations confirming the picture of allowed decays. The spin-parity of the added levels, assigned in previous fusion-evaporation experiments, is confirmed on the basis of decay feeding arguments
Probing ultrafast foam homogenization with grating-based X-ray dark-field imaging
No full textMicrostructured foams are emerging as a promising class of targets, with applications ranging from laser-driven particle acceleration to inertial confinement fusion. To unlock their full potential, a deeper understanding of their properties, especially the changes and behavior of the microstructure under extreme conditions, is required. While recently advancing 3D printed foam targets can be observed by X-ray radiography, the microstructure in chemically produced targets is far below the spatial resolution of conventional radiography. To overcome this limitation, we apply grating-based X-ray dark-field imaging to observe structural changes in foams that are rapidly heated by laser-accelerated proton pulses. The experimental data is compared to synthetic dark-field values obtained from hydrodynamic simulations of a simplified foam model. Both experimental and simulation results demonstrate the viability of utilizing grating-based dark-field imaging for observing microstructural changes in foam targets