Fragment characteristics from fission of U-238 and U-234 induced by 6.5-9.0 MeV bremsstrahlung

• Fission of U-238 and U-234 induced by bremsstrahlung of 6.5-9.0 MeV endpoint energy has been investigated at the superconducting Darmstadt electron linear accelerator S-DALINAC. Using a twin Frisch grid ionization chamber, fission-fragment energy and mass distributions have been determined by means of the double kinetic-energy technique. Results on the fission-fragment characteristics from U-238(gamma, f) are in agreement with results from the literature. In addition fission-fragment mass and energy distributions from U-234(gamma, f) are presented for the first time in this energy region. An analysis of fission modes within the Brosa model has been performed. The relative yield of the S 1 mode was found to be (13 +/- 3)% in U-234 and (35 +/- 2)% in U-238.

Ämnesord

NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

Nyckelord

f)

random-neck rupture model

deduced fission reaction

mechanism features

parity violation

photofission

NUCLEAR REACTIONS U-234

emission

neutron energies

nonconservation

model

compound nucleus

using twin Frisch grid ionization chamber

measured fission fragment energy spectra

mass distributions and yields

Comparison with other data and multi-modal

distributions

mass

E=5-9 MeV bremsstrahlung

U-238(gamma

np-237(n

Physics

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art (ämneskategori)

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