摘要:

The mass and energy distribution of fission fragments in249Cf(nth, f) were determined by combining TOF and energy data of the fragments. The first results are discussed.

ISSN:0033-7579    

DOI:10.1080/00337578608207415

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The gridded ion chamber developed at CBNM provides a powerful tool for measurements of fission fragment angular, kinetic energy and mass distributions with an angular efficiency close to 4π. In the present experiment it is used together with a neutron time-of-flight detector to measure the correlation between neutron emission, fragment angle, mass and energy in the spontaneous fission of252Cf.

ISSN:0033-7579    

DOI:10.1080/00337578608207416

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Fragment mass and kinetic energy distribution, measured by time of flight method, in cold fission of U-233, U-235, and Pu-239, are interpreted by a static scission model. Coulomb and shell effects play a decisive role in scission configurations. Absence of odd-even effects is assumed to indicate that there is at least one nucleon pair broken in every fragmentation.

ISSN:0033-7579    

DOI:10.1080/00337578608207417

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Angular distributions of fission fragments produced in the232Th(n, f) reaction have been measured in 40-keV intervals. A simplified reaction model was adopted, and a channel analysis doneor 0.72 ≤ En(MeV) ≤ 4.5 MeV. An anomaly at En= 2.98 MeV suggests that K remains a good quantum number some 2 MeV above the fission threshold. The percentage contribution to the cross section of K = 3/2 states for incident neutron energies between 1.1 and 1.3 MeV is larger than previously thought.

ISSN:0033-7579    

DOI:10.1080/00337578608207418

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The post-neutron absolute mass yields of 35 products from 23 mass chains for232U(nth, f) have been determined by γ-ray spectroscopy. The resulting mass distribution for232U is compared with the corresponding existing data on233U and235U.

ISSN:0033-7579    

DOI:10.1080/00337578608207419

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The existence of even-odd charge effects (fine structure) in ν(A) for252Cf(sf) has been confirmed. The fine structure is seen to increase in amplitude as the fragment excitation energy decreases, a behaviour similar to that of the mass yield curve.

ISSN:0033-7579    

DOI:10.1080/00337578608207420

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The proton odd-even effect in fission charge distribution yields is shown to be the quantum mechanical fragmentation process, arising due to shell effects in adiabatic potential and structure of adiabatic cranking masses. Additional contribution is shown to come from the coupling of relative motion to charge fragmentation coordinate, that is solved analytically. The dynamics occur near the top of barrier, just past saddle shape.

ISSN:0033-7579    

DOI:10.1080/00337578608207421

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The (γ, f) and (γ, n) cross-sections and the mean numbervof neutrons per fission have been measured for232Th and238U between 5 and 10 MeV. A new method of making bremsstrahlung measurements resulted in data having a good combination of energy resolution and statistical accuracy. For232Th observed subthreshold (γ, f) cross-section resonances andvvalues suggest the existence of two separate shallow wells superimposed on the double humped fission barrier. For238U similar resonances between about 5.5 and 6.0 MeV cannot easily be interpreted in terms of the double humped fission barrier.

ISSN:0033-7579    

DOI:10.1080/00337578608207422

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

It was found that the mean total kinetic energy of two main fragments in triton accompanied fission is 1.7±0.2 MeV higher than that in LRA fission. In addition, the neutron emission probabilities for LRA, He-3, triton and proton accompanied fission of Cf-252 were measured.

ISSN:0033-7579    

DOI:10.1080/00337578608207423

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

For applied purposes it is useful to have neutron spectral information in a simple analytic form. Experimental spectra are approximated by Maxwellian expression, however the better agreement used to be achieved with a sum of Maxwellian distributions.

ISSN:0033-7579    

DOI:10.1080/00337578608207424

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor