Spontaneous fission properties of {sup 252,254}No and {sup 256,258}[104] and the disappearance of the outer fission barrier

Conference · Wed Sep 01 04:00:00 EDT 1993

OSTI ID:10125722

Wild, J F; Hulet, E K; Lougheed, R W; Moody, K J; Bandong, B B; Dougan, R J; Veeck, A

The mass and total kinetic energy distributions from the spontaneous fission of {sup 252}No, {sup 254}No, {sup 256}[104], and {sup 258}[104] were measured. The results, in combination with earlier measurements for {sup 256}No, {sup 258}No, and {sup 262}No, show a sharp transition from asymmetrical mass division in {sup 256}No to symmetrical division for {sup 258}No and {sup 262}No. On the other hand, all isotopes of element 104, including {sup 260}[104], appear to yield broadly symmetrical mass distributions. The total kinetic energies around 200 MeV for the 104 isotopes indicate that they fission by the low-energy mode of bimodal fission. Recent calculations of static potential energy surfaces including higher-order asymmetric deformations suggest that the outer fission barrier is well below the ground state in energy, which accounts for the observance of the symmetric mass division.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10125722
• Report Number(s): UCRL-JC--112897; CONF-930905--23; ON: DE94007121
• Country of Publication: United States
• Language: English

Related Subjects

663470
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DISTRIBUTION
ELEMENT 104 256
ELEMENT 104 258
FISSION
MASS
NOBELIUM 252
NOBELIUM 254
NUCLEAR POTENTIAL
SPONTANEOUS FISSION