The helium-7 system has been experimentally studied many times, however, there are still uncertainties in the description of $^7$He structure.
According to the systematics for the single-particle state widths, the excited states of this nucleus have a large (comparable to the decay energy) decay width. So, it is impossible to obtain convincing indications of the existence of excited states...
The ACCULINNA-2 fragment separator was newly built at FLNR JINR [http://aculina.jinr.ru/] for providing RIB with Z≤20 and 20-40 AMeV. The driver U-400M cyclotron is under reconstruction until end of 2022.
The experimental complex ACCULINNA-2 includes a wide range of tools and detector systems:
• Beam equipment: production target unit, beam dump, wedge and slits.
• Additional RIB cleaning...
Fast and high-energy neutrons could be produced by accelerators and high-power lasers. Standard detection and neutron spectrometry techniques start to have challenging problems with neutrons with energies of 20 MeV and higher. There are several groups trying to apply approach of scintillation detectors for this energy area; special layered Bonner spheres method also could be applied with some...
A new detector system aimed to study spontaneous fission properties of short-lived nuclei was created. The system consists of DSSSD array surrounded by 116 $^3$He-counters of neutrons. Focal plane DSSSD has 128$\times$128 strips and 100$\times$100 mm$^{2}$ area. Single neutron registration efficiency of counters assembly was measured as 54.7$\pm$0.1% with using $^{248}$Cm-source. The setup was...
