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[en] Experimental data on the β-strength function, S/sub β/(E), of short-lived, neutron-rich fission products are of importance for various problems in nuclear physics, astrophysics as well as for reactor applications. The present paper reports on experimental techniques to study the β-decay of nuclides far from stability and gives a comparison of recent data obtained in the A = 100 mass region with predictions from different nuclear models. It is demonstrated that current straightforward techniques for extrapolations to unknown nuclei are likely to fail if nuclear structure is not taken into account in a realistic way

[en] Independent fission yields of ^87-92Br and ¹³⁷-¹⁴¹I produced by thermal neutron induced fission of ²³⁵U have been determined using a rapid chemical separation procedure based on the formation of volatile methylhalides through recoil reactions. The isotopic charge distributions and the proton odd-even effect are discussed. Using experimental fission yields and previously measured β-delayed neutron abundances, the neutron emission probabilities, Pn, were recalculated. The Pn-values are discussed in the framework of a simple semi-empirical systematics. (orig.)

[en] Reliable predictions of β-decay properties of nuclei far from stability require knowledge of the β-strength distribution, Ssub(β)(E). By comparison of experimental strength functions of neutron-rich Rb isotopes in the transitional region around A=100 with Ssub(β)(E) from different nuclear models, the sensitivity and physical significance of Ssub(β)(E) on various integral and spectral β-decay properties are examined. The reliability of extrapolations and the applicability to different fields in nuclear physics, astrophysics and reactor technology are discussed. It is shown that, although there has been considerable progress in the physical understanding of the decay properties of nuclei far from β-stability over the past few years, there are still open questions which make recent statements on the solution of long-standing problems related to the standard processes of β-decay premature. (orig.)

[en] Recent developments in β-delayed neutron (DN) spectroscopy are reviewed, and the importance of DN energy spectra for various problems in reactor physics, nuclear physics and astrophysics is discussed

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