The ${}^{105}\mathrm{Rh}$ nucleus has been studied with the ${}^{100}\mathrm{Mo}\left({}^{11}\mathrm{B},\alpha 2n\gamma \right)$ reaction at $43\text{MeV}$ incident energy. A rich variety of structures was observed at high and low spins, using $\gamma \text{−}\gamma \text{−}t$ and $\gamma \text{−}\gamma \text{−}\mathit{particle}$ coincidences and directional correlation ratios. A $\gamma$-vibrational band was observed for the first time in this nucleus. A new structure based on the intruder $1∕2^{+}$[431] proton orbital was identified. Four magnetic dipole bands have also been observed at high spin, three of which have negative parity and have similar characteristics: they are very regular in energy spacing, presenting nearly constant alignments and large values of $B\left(M1\right)∕B\left(E2\right)$ ratios. Two of them are nearly degenerate in excitation energy and could be chiral partners. The $\pi g_{9∕2}\otimes \nu h_{11∕2}\left(g_{7∕2},d_{5∕2}\right)$ configuration is tentatively assigned for these bands, with the angular momenta of the proton and neutron intruders and the collective angular momentum aligning along the three perpendicular axes of the triaxial core, as predicted by tilted axis cranking calculations.

The low- and medium-spin states of the $N=50$ neutron-rich, ${}_{37}{}^{87}\mathrm{Rb}$, ${}_{35}{}^{85}\mathrm{Br}$, ${}_{34}{}^{84}\mathrm{Se}$ and ${}_{32}{}^{82}\mathrm{Ge}$ isotones have been populated in deep-inelastic processes produced by the interaction of $460\mathrm{MeV}$ ${}^{82}\mathrm{Se}$ ions with a ${}^{192}\mathrm{Os}$ target. The subsequent $\gamma$ decay has been investigated at the Laboratori Nazionali di Legnaro using the GASP $\gamma$-ray detector array. The comparison of the experimentally observed excited states with shell-model calculations performed with and without neutron degrees of freedom has allowed the investigation of the role of the neutron-core breaking excitations and therefore of the $N=50$ shell gap. The inclusion of neutron configurations in the shell-model calculations results in an improved agreement between the experimental and calculated level energies at medium and high spin. These results highlight the considerable contribution of neutron-core particle-hole excitations across the $N=50$ shell gap to the level configurations. The overall agreement of the measured excited states with the shell-model predictions is indicative of the persistence of the $N=50$ shell gap down to $Z=32$.

This paper presents a Dual-Core LockStep (DCLS) implementation to protect hard-core processors against radiationinduced soft errors. The proposed DCLS is applied to an ARM Cortex-A9 embedded processor. Different software optimizations were evaluated to assess their impact on performance and fault tolerance. Heavy ions experiments and fault injection emulation were performed to analyze the system susceptibility to errors and the DCLS performance. Results show that the approach is able to decrease the system cross-section and achieve high protection against errors. The DCLS successfully protects the system from up to 78% of the injected faults. The execution performance analysis shows that by reducing the number of verifications and augmenting the block partition execution time it is possible to increase the system reliability with minimal performance losses.

This work evaluates the RISC-V Rocket processor embedded in a COTS SRAM-based FPGA under heavy-ion induced faults and emulation fault injection. We also analyze the efficiency of using mitigation techniques based on hardware redundancy and scrubbing. Results demonstrated an improvement of 3× in the cross-section when scrubbing and coarse grain triple modular redundancy are used. The Rocket processor presented analogous sensitivity to radiation effects as the state-of-the-art soft-processors. Due to the complexity of the system-on-chip, not only the Rocket core but also its peripherals should be protected with proper solutions. Such solutions should address the specific vulnerabilities of each component to improve the overall system reliability while maintaining the trade-off with performance.