Spontaneous fission properties of {sup 252,254}No and {sup 256,258}[104] and the disappearance of the outer fission barrier
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; TRN: 94:007348
- Resource Relation:
- Conference: Actinides `93,Santa Fe, NM (United States),19-24 Sep 1993; Other Information: PBD: Sep 1993
- Country of Publication:
- United States
- Language:
- English
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