The goal of the FAZIA Collaboration is the design of a new-generation 4 πdetector array for heavy-ion collisions with radioactive beams. This article summarizes the main results of the R&D phase,...

We investigated the performance of synthetic high purity monocrystalline diamond radiation detectors fabricated with TiW, Cr/Au and a novel metallization technique utilising diamond-like carbon tunnelling junction and Pt/Au as electrical contacts. The investigation was carried out under irradiation with ⁶⁰Co gamma-rays, ⁹⁰Sr electrons and ²⁴¹Am alpha-particles. The experimental results with respect to I-V dark current levels, irradiation photocurrent, signal-to-noise ratio and time response have been compared and discussed. Results show an ohmic behaviour of the DLC/Pt/Au contact, a charge collection efficiency of 100% at an applied electric field of 0.377 V/ mum for all electrical contacts (under ⁹⁰Sr electrons irradiation) at a correspondent dark current value of less than a picoAmpere. The single crystal CVD DLC/Pt/Au diamond radiation detector reported here shows spectroscopic energy resolution of 1.1% at an applied voltage of +450 volts (0.9 V/mum) under 5.5 MeV alpha particle irradiation. No dasiamemorypsila or dasiapumpingpsila effect was observed for the DLC/Pt/Au contact at positive bias; the signal was also stable (fluctuations below 0.5%) and reproducible under ⁶⁰Co irradiation, with a signal-to-noise ratio > 10000:1 and a linearity in the dose rate response.

Previously unknown isotopes ${}^{30}\mathrm{Ar}$ and ${}^{29}\mathrm{Cl}$ have been identified by measurement of the trajectories of their in-flight decay products ${}^{28}\mathrm{S}+p+p$ and ${}^{28}\mathrm{S}+p$, respectively. The analysis of angular correlations of the fragments provided information on decay energies and the structure of the parent states. The ground states of ${}^{30}\mathrm{Ar}$ and ${}^{29}\mathrm{Cl}$ were found at $2.25_{-0.10}^{+0.15}$ and $1.8\pm 0.1\mathrm{MeV}$ above the two- and one-proton thresholds, respectively. The lowest states in ${}^{30}\mathrm{Ar}$ and ${}^{29}\mathrm{Cl}$ point to a violation of isobaric symmetry in the structure of these unbound nuclei. The two-proton decay has been identified in a transition region between simultaneous two-proton and sequential proton emissions from the ${}^{30}\mathrm{Ar}$ ground state, which is characterized by an interplay of three-body and two-body decay mechanisms. The first hint of a fine structure of the two-proton decay of ${}^{30}{\mathrm{Ar}}^{*}(2^{+})$ has been obtained by detecting two decay branches into the ground and first-excited states of the ${}^{28}\mathrm{S}$ fragment.