Spontaneous fission properties of 262104Rf
Abstract
We have measured the mass and kinetic-energy distributions of fragments from the spontaneous fission (SF) of 262104Rf. The 262104Rf was produced via the 244Pu(22Ne,4n) reaction with a production cross section of ~0.7 nb using 114.4-MeV projectiles. The kinetic energies and times of the coincident fission fragments were measured using our rotating wheel system. From these data the half-life, mass, and kinetic-energy distributions were derived. The total kinetic-energy (TKE) distribution appears to consist of a single component with a most probable pre-neutron-emission TKE of 215+/-2 MeV. The mass distribution is symmetric with a full width at half maximum of about 22 mass numbers. These results are consistent with trends observed for other trans-berkelium spontaneously fissioning isotopes. We determined the half-life to be 2.1+/-0.2 s by measuring its spontaneous fission decay. We also attempted to observe the alpha decay of 262104Rf by searching for alpha decay correlated in time with SF from the alpha daughter, 1.2-ms 258No. We observed no such decays and have set an upper limit of 0.8% (68% confidence level) on the alpha decay branch of 262104Rf.
- Publication:
-
Physical Review C
- Pub Date:
- June 1996
- DOI:
- 10.1103/PhysRevC.53.2893
- Bibcode:
- 1996PhRvC..53.2893L
- Keywords:
-
- 25.85.Ca;
- 25.70.Gh;
- 27.90.+b;
- Spontaneous fission;
- Compound nucleus;
- 220<
- =A