Search for new isotopes of element 112 by irradiation of U-238 with Ca-48

Citation
Yt. Oganessian et al., Search for new isotopes of element 112 by irradiation of U-238 with Ca-48, EUR PHY J A, 5(1), 1999, pp. 63-68
Citations number
16
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL A
ISSN journal
14346001 → ACNP
Volume
5
Issue
1
Year of publication
1999
Pages
63 - 68
Database
ISI
SICI code
1434-6001(199905)5:1<63:SFNIOE>2.0.ZU;2-D
Abstract
The reaction Ca-48+U-238 was investigated at the recoil separator VASSILISS A at the Flerov Laboratory of Nuclear Reactions, JINR Dubna, in attempts to synthesize new isotopes of element 112. The experiments were performed at two beam energies resulting in excitation energies of the compound nucleus of 33 and 39 MeV. The collected beam dose was 3.5x10(18) and 2.2x10(18), re spectively. Two spontaneous fission events were observed at the lower beam energy, which tentatively were assigned to the new neutron rich isotope (28 3)112 produced in the reaction U-238(Ca-48,3n)(283)112. The measured cross- section is (5.0 (+6.3)(-3.2)) pb and the half-life is (81 (+147)(-32)) s. N o event was observed at the higher beam energy resulting in the upper cross -section limit of 7.3 pb.