No abstract available

[en] The decay data (T/sub 1/2/, Q/sub β/, < E/sub β/> and < E/sub γ/>) for fission-product nuclides are reviewed, with emphasis on those nuclides important for decay-heat calculations in the region from ∼10 sec to ∼10³ sec. Problems involved in deducing < E/sub β/> and < E/sub γ/> values for these, and hence for even more neutron-rich, nuclides are illustrated by the example of ⁸⁷Br

[en] Some of the problems that arise in the evaluation of decay-schemes data to obtain values for the intensities of beta transitions are discussed. As examples of these problems, the decay schemes of ⁸⁷Br and ²³³Pa are examined. No specific solutions to these problems are offered; but by pointing out to the participants in the International Nuclear Structure and Decay Data Evaluation Network, and to others, it is hoped that a general understanding of them can be gained, which may ultimately lead to a consistent means of dealing with them. 14 refs., 2 figs

No abstract available

[en] In this paper, we discuss several categories of decay data which have contributed to low-energy nuclear physics, indicate some of the ways they are useful in solving problems in other areas, and identify needs for further measurements. Illustrations include half-life and emission-probability data of actinide nuclides important for reactor technology and useful as reference standards for nuclear-data measurements. Decay data of highly neutron-rich fission-product nuclides are important in such diverse areas as astrophysics and reactor-safety research. Some of these data needs and experimental approaches suitable for satisfying them are presented. 17 refs., 1 tab

[en] The current status of the work being carried out in various US laboratories specifically oriented toward the objectives of this IAEA CRP is briefly reviewed. Reported are the gamma-ray emission-probability measurements, and related studies, at INEL, the half-life measurements being done by the participants in the US Half-Life Evaluation Committee (ANL, LANL, LLNL, Mound Lab., NBS and Rocky Flats), and the absolute α-intensity measurements at ANL

[en] In 1977, the IAEA organized a Coordinated Research Program to address the needs for precise actinide-isotope decay data identified at the first Advisory Group Meeting on Transactinium Isotope Nuclear Data, held in Karlsruhe in 1975. During the years of its existence, this CRP has made significant strides toward achieving the goals outlined at Karlsruhe. In this paper, we discuss the make-up of the CRP and its work in the areas of decay-data evaluation and measurement. The objectives of the evaluation effort and some of the results to date are summarized. The measurement activity being carried out within the various participating laboratories is presented. Finally, the significant accomplishments resulting from the work of the CRP participants are discussed, together with those tasks which remain to be done in order to be fully responsive to the goals of the Program as envisioned at Karlsruhe

[en] Because they populate final states without regard to the details of the nucleonic configurations, neutron-capture γ rays are ideally suited for locating essentially all the low lying nuclear states whose spins lie within a few units of that of the capturing state. With the reduction of the Porter--Thomas fluctuations through the use of neutrons having an energy distribution broad enough to average over a finite (and large) number of capture resonances, the primary capture γ-ray intensities can provide rather definite spin-parity information for those states which they are observed to populate. The power of these studies is greatly enhanced through the analysis of such resonance-averaged spectra at two distinct neutron energies, approx. 2 and approx. 24 keV, obtained from Sc and Fe neutron ''filters'', respectively. The use of resonance-averaged primary γ-ray spectra as a tool for low-energy nuclear spectroscopy is discussed and its strengths and limitations pointed out. Examples are drawn from studies of 2- and 24-keV neutron capture in samples of ^154156157158Gd and ²³⁸U. 20 references

[en] All the known nuclear-structure information on the A=156 nuclides from ¹⁵⁶Nd through ¹⁵⁶Ta has been reviewed. These data are summarized and presented, together with adopted level schemes and properties based on an evaluation of them

[en] As one result of the First IAEA Advisory Group Meeting on Transactinium Isotope Nuclear Data, held in November 1975 at Karlsruhe, an IAEA Coordinated Research Program was set up to address certain identified actinide-isotope decay-data needs in reactor technology. At present, laboratories from five nations are involved in this effort. This paper gives an overview of this program, including its origin and the present status of the measurements being carried out. The current status of the actinide-nuclide half-life, spontaneous-fission branching ratio, α-intensity and γ-intensity data of concern to the Coordinated Research Program is presented and briefly discussed. 3 figures, 9 tables