Neutron and fragment yields in proton-induced fission of 238U at intermediate energies

The primary fission fragment mass and kinetic energy distributions, and neutron multiplicities as function of fragment mass have been measured in the proton-induced fission of 238U at energies E p=20, 35, 50 and 60 MeV using time-of-flight technique. Pre-scission and post-scission neutron multiplici...

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Published in:	Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 463; no. 3; pp. 653 - 662
Main Authors:	Rubchenya, V.A., Trzaska, W.H., Vakhtin, D.N., Äystö, J., Dendooven, P., Hankonen, S., Jokinen, A., Radivojevich, Z., Wang, J.C., Alkhazov, I.D., Evsenin, A.V., Khlebnikov, S.V., Kuznetsov, A.V., Lyapin, V.G., Osetrov, O.I., Tiourin, G.P., Aleksandrov, A.A., Penionzhkevich, Yu.E.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-05-2001
Subjects:	Fission fragment yields Fission neutron multiplicities Proton-induced fission Statistical theory of fission Time-of-flight technique Time-of-flight technique 29-40.Cs 25-85.Ge 29-40.Mc Proton-induced fission Fission fragment yields 24-75.+i 29-30.Hs Fission neutron multiplicities Statistical theory of fission
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Summary:	The primary fission fragment mass and kinetic energy distributions, and neutron multiplicities as function of fragment mass have been measured in the proton-induced fission of 238U at energies E p=20, 35, 50 and 60 MeV using time-of-flight technique. Pre-scission and post-scission neutron multiplicities have been extracted from double differential distributions. The fragment mass dependence of the post-scission neutron multiplicities reveals the gross nuclear shell structure effect even at the higher proton energies we measured. The yields of neutron-rich fission products in the fission of 238U by 25 MeV protons were measured using an ion guide-based isotope separator technique. The results indicate enhancement for superasymmetric mass division at intermediate excitation energy of the fissioning nucleus. The experimental results have been analysed in the framework of a time-dependent statistical model with inclusion of nuclear friction effects in the fission process.
ISSN:	0168-9002 1872-9576
DOI:	10.1016/S0168-9002(01)00176-0