[en] Two new neutron-deficient isotopes ^207,208Ac have been produced in fusion reactions with 5.2-5.6 MeV/nucleon ⁴⁰Ar ions on ¹⁷⁵Lu and identified on the basis of genetic correlations. The fusion evaporation products were separated on-line using a gas-filled magnetic recoil separator. The alpha energy and half-life of ²⁰⁸Ac were determined to be (7572±15) keV and (95_-16⁺²⁴) ms, respectively. A nw alpha line with a half-life of (25_-5⁺⁹) ms and an energy of (7758±20) keV is assigned to the decay of an isomeric state in ²⁰⁸Ac. Another new activity with a half-life of (22_-9⁺⁴⁰) ms and an alpha energy of (7712±25) keV is assigned to ²⁰⁷Ac. (orig.)

[en] A position-sensitive neutron detector (PSND) has been designed and tested as a module of a multi-detector array. ''Cross-talk'' effects, contributing a major distortion factor for all closely packed neutron detector systems, have been measured. It was established, using neutrons from the spontaneous fission of ²⁵²Cf (setting neutron energy threshold at 0.7 MeV), that the distortions of neutron energy and of neutron angular distribution are insignificant (within the level of statistical accuracy). The influence of cross-talk on the coincidence counting rate was measured to range from 48% to 16% for distances between detector's axes of 12 to 24 cm. ((orig.))