The pulse-height versus deposited energy response of a single-crystal chemical vapor deposition (scCVD) diamond detector was measured for ions of Ti, Cu, Nb, Ag, Xe, Au, and of fission fragments of 252 Cf at different energies. For the fission fragments, data were also measured at different electric field strengths of the detector. Heavy ions have a significant pulse-height defect in CVD diamond material, which increases with increasing energy of the ions. It also depends on the electrical field strength applied at the detector. The measured pulse-height defects were explained in the framework of recombination models. Calibration methods known from silicon detectors were modified and applied. A comparison with data for the pulse-height defect in silicon detectors was performed.

The model of collinear cluster tri-partition with light ion (Be-Ne) emission discovered in the 235U(nth, f) reaction is discussed. Masses, velocities, energies, and nuclear charges, specific ionization losses of reaction products known from experiment allow us to assume that the process is two-stage, where at the first stage the system forms into two magic clusters, and at the second stage a light ion is detached from the light cluster, forming a magic remainder.

Forthcoming experiments aimed at studying the mechanism of collinear cluster tripartition are planning to be performed with the new facility. Charged products will be registered with the double arm time‐of‐flight spectrometer composed of mosaics of PIN ‐diodes and MCP (micro channel plates) based timing detectors. Several tens of 3He‐filled counters will be gathered round the 252Cf source. In order to choose an optimal configuration of the neutron detector and other parameters of the experiment special modeling has performed using both “neutron barrel” and known MCNP code. The first test run of the new facility is in progress also its “neutron skin” in under construction.

The 4π-fragment-spectrometer FOBOS developed for heavy-ion research at beam energies of 10–100 AMeV has been commissioned for physical experiments at the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research in Dubna. Based on the logarithmic detector principle, it is able to register charged fragments from protons up to heavy residual nuclei in a large dynamical range. Position-sensitive avalanche counters, axial ionization chambers and CsI(Tl) scintillation detectors are arranged in three concentric detector shells. An array of phoswich detectors is used as a more granular forward detector at narrow polar angles. The modular concept of FOBOS allows for different experimental application in the field of exclusive fragment spectroscopy at medium multiplicities. For illustration, the fragment spectroscopy studies concerning the spontaneous fission process and the fragmentation of hot nuclei by means of the FOBOS set-up are considered.

The construction of a modular detector system is described, which is based on a set of detectors with different stopping powers covering a wide dynamic range (1-500). Each module is composed of a position-sensitive avalanche counter, an ionization chamber of the Bragg type, and a CsI(Tl) scintillation crystal detector array. A system of 30 modules forms a 4 pi PHOBOS setup (Laboratory of Nuclear Reactions, JINR) capable of studying nuclear reactions involving heavy nuclei with energies up to 100 MeV/nucleon. The intrinsic time resolution of an avalanche counter is 0.2 ns, and its coordinate resolution is 2 mm; the energy resolution of the Bragg chamber is 1%, and the accuracy of charge determination corresponds to Z/dZ = 65 for Al. The CsI(Tl) scintillation counters ensure the stopping of light charged particles with energies up to 65 MeV/nucleon. An analysis of the shape of light pulses allows light particles with Z < 3 to be identified. The combined detector modules have been successfully employed in experiments on the PHOBOS setup since 1993.

The 4π-fragment-spectrometer FOBOS developed for heavy-ion research at beam energies of 10–100 AMeV has been commissioned for physical experiments at the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research in Dubna. Based on the logarithmic detector principle, it is able to register charged fragments from protons up to heavy residual nuclei in a large dynamical range. Position-sensitive avalanche counters, axial ionization chambers and CsI(Tl) scintillation detectors are arranged in three concentric detector shells. An array of phoswich detectors is used as a more granular forward detector at narrow polar angles. The modular concept of FOBOS allows for different experimental application in the field of exclusive fragment spectroscopy at medium multiplicities. For illustration, the fragment spectroscopy studies concerning the spontaneous fission process and the fragmentation of hot nuclei by means of the FOBOS set-up are considered.