Download PDF by R. M. Steffen (auth.), Hans van Krugten, Bob van Nooijen: Angular Correlations in Nuclear Disintegration: Proceedings

By R. M. Steffen (auth.), Hans van Krugten, Bob van Nooijen (eds.)

ISBN-10: 9401177317

ISBN-13: 9789401177313

ISBN-10: 9401177333

ISBN-13: 9789401177337

In 1969 we feit that the topic of angular correlations in nuclear disintegrat­ ion had obtained little particular realization at foreign meetings. it truly is actual that perturbed angular correlations were mentioned at a smalI, hugely - specialized assembly at Uppsala in 1963 and that during 1967 convinced points of perturbed angular correlations have been thought of at a convention on hyperfine constitution at Asilomar. notwithstanding, either meetings have been very restricted in scope from the viewpoint of a low - strength nuclear physicist. along with, considering those meetings have been being held, the sphere of perturbed ?ngular correlations had bought new impetus from the nonetheless ex­ panding program of the implantation of radioactive isotopes in appropriate environ­ ments, from the development of huge superconductive magnets, and so on. in the meantime, the means of measuring correlations among beta debris and circularly polarized gamma rays have been constructed to the sort of measure that they lent themselves to the in­ vestigation of beta decay, nuclear constitution and cost dependence of nuclear forces. The systematic learn of heavy components had elevated the import an ce of alpha-gamma angular correlations which current their very own particular difficulties. Theoretical inner conversion information had develop into on hand to such an volume that electron -gamma direct­ ional correlations grew to become a big software within the research of nuclear constitution: in a lot of circumstances it truly is more desirable to review electron -gamma corre­ lations rather than the generally measured gamma -gamma directional correlations.

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Extra info for Angular Correlations in Nuclear Disintegration: Proceedings of the International Conference on Angular Correlations in Nuclear Disintegration Delft, The Netherlands August 17–22, 1970

Example text

1"1. 07 · 2'/. n7. <. : i N Fi9_6 , ENERGV 6 (M . V) / Fi 9-, 2 ,,3"1. ----. 4"1. · 5'/. -3 "- m (mm) Fig. 6. Comparison between 'double escape peak' and 'all intensity' correction factors (from Ingebrektsen, Nucl. Instr. and Meth . 60 (1968) 308). Fig. 7. Effects of a slight decentering on a PAC - experiment (see text). 0002 _ of data taken with different sources. The specific angles were chosen at the steepest points on the correlation curve of the 613 - 576 ke V cascade in 106 Pd and the perturbation was caused by the 620 kG hyperfine field for Pd in iron.

4 06 10 2 0 40 RAY ENERGY ( MeV ) Fig. 2. , Nucl. Instr. and Meth. 78 (1970) 295). The parameters ~ are related to QK by aseries expansion. C. 30 that the corrections were not very sensitive to the use of slightly different cross - sections. PI and AI correction factors were obtained separately. Their modified Monte Carlo type of calculation (cf. Yates) showed identical results with the direct calculation for the AI factors but there was an unexplained difference between the two sets for the PI data at very short source - detector distances and higher 'Y - energies.

0 ;SO :A ~ ~ ;: ~ ~ :A ~ ~ ~ :l. C. TI monochromatic 'Y - rays, and uses weighting and leastsquares fitting. Least - squares fits are to be preferred because of the fact that the accumulative errors, which enter in the normalline - after -line stripping, are avoided. In the final evaluation of the angular correlation coefficients of all the coincident cascades one can make use of the following facts: 1. If, among the correlations, there is one wh ich is completely known from other evidence (such as a 0-2-0 cascade) it can be used as a check on the normalization of all the other cascades.

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Angular Correlations in Nuclear Disintegration: Proceedings of the International Conference on Angular Correlations in Nuclear Disintegration Delft, The Netherlands August 17–22, 1970 by R. M. Steffen (auth.), Hans van Krugten, Bob van Nooijen (eds.)

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