Detection system of the COMBAS fragment separator

Abstract

The (∆E 1 , ∆E 2 , E) multidetector telescope has been developed and tested. The telescope is a compact combination of two 32-strip silicon ∆E 1 -, ∆E 2 -detectors and a scintillation E-detector, which is a 3 × 3 array of CsI(Tl) crystals. A timing signal can be obtained from any of the Si detectors for time-of-flight (TOF) measurements. Single-channel and 32-channel charge-sensitive preamplifiers have been developed and manufactured for the multidetector module to serve the ∆Eand Е-detectors with high efficiency and sensitivity. Reaction products obtained in the 40 Ar (35 MeV/nucleon) + 9 Ве reaction have been unambiguously identified in the experiment by mass number A and atomic number Z.

Radioactive nuclear beams of COMBAS facility

“…17 for comparison. We can also note that the dominating quantity of neutron rich isotopes is expected on the 10 beams of the heavier bombarding particle 64 Ni in com parison with the fragmentation of a lighter nucleus 58 Ni. However, this advantage is not so significant as was in the case of 48 Ca beams as compared to 40 Ca.…”

“…The energy and angular correlations of [6][7][8][9][10][11] Li, 9⎯14 Be, and 10-17 B breakup products is planned to mea sure in the plane and beyond the plane of the reaction. This will provide the means not only for studying the spectral function of resonances, but also for determin ing the resonance spins without recourse to the model representations.…”

“…The telescope detector system [10] for kinematic separator COMBAS is constructed from cascade pen etrated X and Y-coordinated detectors of deferent thickness for measuring the energy losses ΔE (Fig. 11a), residue energy E r (Fig.…”

“…(1) the telescope from Si and CsI/Tl detectors to identify the whole composition of nuclear reaction products over Z and A [10];…”

“…To understand the mechanism of structural changes in nuclei with increasing isospin, we are plan ning to study an evolution of the cluster structure with an increase of neutron excess N/Z in the chain of light element isotopes [6][7][8][9][10][11] Li, [9][10][11][12][13][14] Be, and 10-17 B.…”