[en] A method is presentd, which allows the determination of multipolarities of high spin band transitions. By that, the spin dependent γ angular distribution is combined with the conversion electron angular distribution, which depends on the parameters of the conversion process. Model independent results on multipolarities of prompt transitions can be obtained by measurement of the cos²theta-term of the γ and e^- decay angular distribution.A discussion of the findings on the basis of the three-axial and axially symmetric Coriolis coupling model shows that the 11/2^- bands can be much better described by taking int account a hexadecapole deformation than by the introduction of a degree of freedom. From the calculations, small negative values result for the quadrupole and hexadecapole momentum (β₂ ungefaehr -0.1 β₄ ungefaehr -0.008) of the isotopes with N=75, 77 and isotopes with Z=77. In Agreement with the system: atics of lifetimes, the parameters found permit an interpretation of the 11/2^- states as shape-isomeric states as the ground states of the odd nuclei exhibit a prolate deformation which is sometimes quite high. A discussion of the findings on the basis of the three-axial and axillay symmetric coriolis coupling model shaws that the 11/2^- bands can be much letter described by taking into account a hexadecapole deformation than by the introduction of a γ degree of freedom. From the calculations, small negative values result for the quadrupole and hexacapole momentum (β₂ approximately -0.1, β₄ approximately -0.008) of isotopes with N=75, 77 and isotopes with Z=77. In agreement with the systemactics of lifetimes, the parameters found permit on interpretation of the 11/2^- states as shape-isomeric states as the ground states of the cold nuclei exhibit a prolate deformation which is sometimes quite high. (orig./WL)

[en] We present a model which allows for the calculation of fragment excitation energy, fragment kinetic energies and neutron evaporation in nuclear fission. The model is based on the assumption that, at the end of the fission process, fragments are excited to a temperature which is proportional to the reaction Q-value. Starting from this assumption the distribution functions of fragment excitation can be formulated and the distribution functions for the kinetic energies can be derived by a Monte Carlo method. From the distribution functions for the excitation energy neutron evaporation characteristics are calculated. (author)

No abstract available

[en] The formalism for the angular distribution of conversion electrons from aligned states is described for transitions with multipole order <= 2. It is shown that the determination of the leading term in both the e^- and ß angular distribution function provides an excellent method for assigning multipolarities E1, M1, E2 and (M1 + E2) to prompt decay lines. The applicability of the method is investigated for different spins, electron energies and Z-values. The influence of attenuation factors in angular distribution measurement is discussed and the effect on the multipole assignment is examined. (orig.)

[en] Measurements carried out to determine the nature of the octupole bandhead in ₂₃₆U led in the past to considerable confusion concerning its spin assignment. To see whether penetration effects are important in the conversion electron decay of the octupole band, a high resolution measurement was carried out at the ß-spectrometer of the ILL. Relative intensities have been determined for the transitions from the octupole bandhead to the O⁺, 2⁺ and 4⁺ members of the ground state rotational. (U.K.)

[en] Measurements of the K, Lsub(I), Lsub(II) and Msub(I) conversion lines of the 687.7 keV transition in ₂₃₆U are evaluated within the electron penetration formalism. The spin-parity assignment of the octupole-band-head is found to be 1^- in accordance with reaction data, and an assignment of 2^- to the 687.7 keV state is ruled out. The penetration matrix element vertical strokeetavertical stroke has the value of 13.5 for the K-shell and increases slightly for higher main shells. An estimate of the anomalous amplitudes is compared with values reported for transitions in the odd even actinide nuclei. Furthermore electron conversion data for the 1^-->2⁺ and 1^-->4⁺ transitions are given. Radioactivity ₂₃₆U from ₂₃₅U(n,e^-); measured: conversion electron decay; deduced: conversion coefficients from K, L and M shells; evaluated: dynamic matrix elements. (orig.)

[en] Short communication

[en] We present a model which allows for the calculation of fragment excitation and kinetic energy in nuclear fission. The model assumes that fission products are excited independently according to an exponential distribution function, which depends on the Q-value of the reaction and the level density parameter in the single fragment. We develop the model description and compare the results for different fissioning systems from actinium to fermium, and for different compound reactions, namely spontaneous fission, fission following thermal neutron capture, and high-energetic reactions with experimental data. (orig.)

[en] The electron paths in the so called 'Spiral Orbit' spectrometer are investigated for different magnetic fields. (orig.)

[en] Published in summary form only