Fission accompanied by alpha particle emission in the12C(85MeV)+232Th reaction

Abstract

Inclusive and coincident spectra of alpha particles and fission fragments were measured for the 232Th+~2C (85 MeV) reaction to study the influence of the excitation energy and the angular momentum on the fission of the compound nucleus and to separate different alpha particle emission mechanisms. At backward angles c~ emission can be accounted for by the evaporation processes. At forward angles the most important contribution is given by the break-up fusion process. Mass distributions for compound nuclei 24'~Cm (E* = 58 MeV, ff coincidences), and 24~ (E* = 37 MeV, ffc~ coincidences) were obtained. In the case of 24~ mass distribution has a shape different from those obtained in light ion reactions at the same excitation energy, indicating the strong influence of the entrance channel. The dependence of the mass distribution shape on the e particle energy is also examined.

Silicon Telescope Detectors

“…The first includes surface-barrier (Si(Au)) and implanted (Si(B, P)) detectors with a thickness of the active area of 10-1500 µ m. These devices are designed to identify and measure the spectra of charged particles and nuclear fragments in SCD telescopes [1,2,6,7] and be applied as monitoring and logic counters in var-ious experimental setups [8,9]. The second group incorporates lithium-drift detectors (Si(Li)) with a thickness of the active area of 2-7 mm, which are the main spectrometric elements in the detection of longrange charged particles with energies E ~ 100 MeV [2,7,10,11].…”