Synthesis of the isotope of element 103 (lawrencium) with mass number 256

Abstract

A new isotope of element 103 with mass number 256 was synthesized by means of the nuclear reaction95Am243 (8O18′ 5n)103Lw256. The detection and identification of103Lw256 was made through the isotope100Fm252, a product of electron capture in101Mv252 produced by α-decay of103Lw256. The half-life of103Lw256 is 45 sec. The energy dependence of the103Lw256 production cross section in the95Am243+8O13 reaction was investigated. It was the shape of a curve with a maximum at an8O18 ion energy ≈96 MeV (lab system). The half-width of the curve is 9 MeV. At the maximum, the cross section is 6·10-32 cm2. The work was carried out with the internal beam of the three-meter, multiply-charged ion cyclotron of the Laboratory for Nuclear Research, JINL. © 1966 Consultants Bureau.