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Title: Prompt neutron emission from the spontaneous fission of sup 260 Md

We have made the first measurement of the number of neutrons emitted from the spontaneous fission of a nuclide in which very high fragment energies dominate the fission process. In bombardments of {sup 254}Es, we produced a large sample of 28-d {sup 260}Md, which was neutron counted in a 1-m-diameter spherical tank containing a Gd-doped scintillator solution. The average number of neutrons emitted per fission is only 2.58{plus minus}0.11, substantially less than for other actinides. A linear dependence of neutron multiplicity on fragment-excitation energy is observed to the highest values of total kinetic energy.
Authors:
; ; ; ; ; ; ; ; ; ;  [1]
  1. (University of California, Lawrence Livermore National Laboratory, Livermore California 94551 (US) Philipps University, D-3550, Marburg an der Lahn, (Federal Republic of Germany))
Publication Date:
OSTI Identifier:
7102639
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review, C (Nuclear Physics); (USA); Journal Volume: 41:2
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; MENDELEVIUM 260; SPONTANEOUS FISSION; CYCLOTRONS; EINSTEINIUM 254 TARGET; EXPERIMENTAL DATA; FISSION FRAGMENTS; GADOLINIUM; KINETIC ENERGY; MASS SPECTRA; MEV RANGE 100-1000; MULTIPLICITY; NEON 22 REACTIONS; NEUTRON EMISSION; PROMPT NEUTRONS; Q-VALUE; ACCELERATORS; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; BARYONS; CHARGED-PARTICLE REACTIONS; CYCLIC ACCELERATORS; DATA; DECAY; ELEMENTARY PARTICLES; ELEMENTS; EMISSION; ENERGY; ENERGY RANGE; FERMIONS; FISSION; FISSION NEUTRONS; HADRONS; HEAVY ION REACTIONS; HEAVY NUCLEI; INFORMATION; ISOTOPES; MENDELEVIUM ISOTOPES; METALS; MEV RANGE; NEUTRONS; NUCLEAR DECAY; NUCLEAR FRAGMENTS; NUCLEAR REACTIONS; NUCLEI; NUCLEONS; NUMERICAL DATA; ODD-ODD NUCLEI; RARE EARTHS; SPECTRA; TARGETS 652020* -- Nuclear Properties & Reactions, A=220 & above, Experimental