Multilayer semiconductor spectrometer for studying light neutron-rich nuclei

A two-arm semiconductor spectrometer for registration of charged particles (p, d, t, He-3,He-4) and their correlations from stopped negative pion abso rption reaction is described. The spectrometer is used for search and spect roscopy of light neutron-rich nuclei produced in two- and three-body reacti ons. The spectrometer consists of two telescopes of 16 Si-detectors in each arm with a sensitive surface of 8 cm(2). The total sensitive thickness of the telescope (43 mm of Si) provides stopping power for protons up to 100Me V. The design of the spectrometer makes it possible to use a radioactive ta rget C-14. A technique of determining the spectrometric characteristics of the setup is presented. It is shown that energy resolution (FWHM) of the sp ectrometer in inclusive measurements is of about 500keV and missing-mass re solution in correlations is of about 1MeV. (C) 2000 Elsevier Science B.V. A ll rights reserved.