Synthesis of the isotopes of elements 118 and 116 in the Cf249 and Cm245+Ca48 fusion reactions
Abstract
The decay properties of 290116 and 291116, and the dependence of their production cross sections on the excitation energies of the compound nucleus, 293116, have been measured in the Cm245 (Ca48, xn)293-x116 reaction. These isotopes of element 116 are the decay daughters of element 118 isotopes, which are produced via the Cf249+Ca48 reaction. We performed the element 118 experiment at two projectile energies, corresponding to 297118 compound nucleus excitation energies of E*=29.2±2.5 and 34.4±2.3 MeV. During an irradiation with a total beam dose of 4.1×1019 Ca48 projectiles, three similar decay chains consisting of two or three consecutive α decays and terminated by a spontaneous fission (SF) with high total kinetic energy of about 230 MeV were observed. The three decay chains originated from the even-even isotope 294118 (Eα=11.65±0.06 MeV, Tα=0.89-0.31+1.07 ms) produced in the 3n-evaporation channel of the Cf249+Ca48 reaction with a maximum cross section of 0.5-0.3+1.6 pb.
- Publication:
-
Physical Review C
- Pub Date:
- October 2006
- DOI:
- 10.1103/PhysRevC.74.044602
- Bibcode:
- 2006PhRvC..74d4602O
- Keywords:
-
- 25.70.Gh;
- 23.60.+e;
- 25.85.Ca;
- 27.90.+b;
- Compound nucleus;
- Alpha decay;
- Spontaneous fission;
- 220<
- =A