Fragment-mass and kinetic-energy distributions from the spontaneous fission of /sup 252/No. [Decay--SF branching fraction]

Journal Article · Tue Feb 01 04:00:00 EST 1977 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.15.705· OSTI ID:7124068

Bemis, Jr, C E; Ferguson, R L; Plasil, F; Silva, R J; Pleasonton, F; Hahn, R L

Pre-neutron-emission fragment-mass and total-kinetic-energy distributions and the mass--energy correlations in the spontaneous-fission decay of 2.30-sec /sup 252/No have been deduced from measured energies of coincident fragment pairs by using silicon surface-barrier detectors. The /sup 252/No for these measurements was produced in the /sup 241/Am(/sup 15/N,4n) reaction and deposited on 40-..mu..g cm/sup -2/ carbon foils by using a He-jet technique. From an analysis of 154 correlated fission events, the average pre-neutron-emission total-kinetic energy, , was found to be 202.4+-1.2 MeV. The mass distribution is decidedly asymmetric, similar to that observed for /sup 252/Cf spontaneous fission, although a maximum in the curve as a function of fragment mass occurs for near-symmetric mass divisions, as it does for the heavier isotopes of fermium. The measured spontaneous-fission--decay branching fraction for /sup 252/No is 26.9+-1.9% and the measured total half-life is 2.30+-0.22 sec. The measured and deduced fission characteristics for /sup 252/No are compared with those for the Cm, Cf, and Fm nuclides as well as with recent theoretical predictions.

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• OSTI ID: 7124068
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 15:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

652022 -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Radioactive Decay-- (-1987)
652026* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
AMERICIUM 241 TARGET
BRANCHING RATIO
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
CROSS SECTIONS
DECAY
ENERGY
ENERGY SPECTRA
EVEN-EVEN NUCLEI
FISSION
FISSION FRAGMENTS
FUSION REACTIONS
HALF-LIFE
HEAVY ION REACTIONS
HEAVY NUCLEI
KINETIC ENERGY
MASS SPECTRA
NEUTRON SPECTRA
NITROGEN 15 REACTIONS
NOBELIUM 252
NOBELIUM ISOTOPES
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
PARTICLE DECAY
SPECTRA
TARGETS