By R. M. Steffen (auth.), Hans van Krugten, Bob van Nooijen (eds.)
In 1969 we feit that the topic of angular correlations in nuclear disintegrat ion had acquired little detailed recognition at foreign meetings. it's actual that perturbed angular correlations have been mentioned at a smalI, hugely - specialized assembly at Uppsala in 1963 and that during 1967 definite points of perturbed angular correlations were thought of at a convention on hyperfine constitution at Asilomar. even if, either meetings have been very restricted in scope from the perspective of a low - power nuclear physicist. in addition to, considering the fact that those meetings have been being held, the sector of perturbed ?ngular correlations had acquired 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 forth. in the meantime, the means of measuring correlations among beta debris and circularly polarized gamma rays have been constructed to this sort of measure that they lent themselves to the in vestigation of beta decay, nuclear constitution and cost dependence of nuclear forces. The systematic research of heavy parts had elevated the import an ce of alpha-gamma angular correlations which current their very own particular difficulties. Theoretical inner conversion facts had develop into to be had to such an quantity that electron -gamma direct ional correlations grew to become an incredible instrument within the research of nuclear constitution: in plenty of situations it's better to review electron -gamma corre lations rather than the generally measured gamma -gamma directional correlations.
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Extra resources for Angular Correlations in Nuclear Disintegration: Proceedings of the International Conference on Angular Correlations in Nuclear Disintegration Delft, The Netherlands August 17–22, 1970
Rev. 92 (1953) 943. K. Alder, H. Albers-Schönberg, E. B. Novey, Helv. Phys. Acta 26 (1953) 761. M. Steffen and H. Frauenfelder, Chapter I of 'Perturbed Angular Correlations' Karlsson et al. Eds. North-Holland Publ. Company, Amsterdam 1964. H. Gabriel, Phys. Rev. 181 (1969) 506. E. Matthias, B. A. M. E. Templeton, Phys. Rev. in press. L. Brady and M. Deutsch, Phys. Rev. L. Brady and M. Deutsch, Phys. Rev. L. Brady and M. Deutsch, Phys. Rev. 78 (1950) 558. For a review see H. M. Steffen, Angular Correlations, Chapter XIX in Alpha- Beta- and Gamma-Ray Spectroscopy, K.
27. M(L-ML'M'IAq). 28. A. R. Mottelson, Nuclear Structure, Vol. A. , New York, 1969), p. 381. 29. K. , Rev. Mod. Phys. 28 (1956) 432. 30. W. Buhring, Nuc!. Phys. 40 (1963) 472; W. Buhring, Nuc!. Phys. 49 (1963) 190; W. Buhring, Nucl. Phys. 61 (1965) J 10. 31. c. Simms, Phys. Rev. 138 (1965) 784. MEANS OF INCREASING THE ACCURACY IN ANGULAR CORRELATION MEASUREMENTS E. Karlsson University of Uppsala, Institute of Physics, Uppsala, Sweden Contents 1. 2. 4 3. 5 4. 2 5. 2 6. In trod uction Corrections for deviations from the ideal geometry Finite detectors Decentering Finite source Source extension effects In ternal absorption and scattering Other angular dependen t effects The selection of the desired quanta Detedor progress Stripping of 'Y-spectra Sum-coincidence methods Scattered quanta Annihilation, bremsstrahlung and X-rays The efficiency 01' data collection Problems with increased counting rates Amplifiers Acciden tal coincidences Intensity correlations - a different approach The use of multi-detector systems Fixed versus movable detectors The use of symmetries Numerical methods in the determination of angular correlation parameters Fitting of angular correlation functions to measured data Cases where parameters enter non-linearly Determination of mixing ratios Statistical considerations of counting sequences Concluding remarks 1.
The zero - point changes can be characterized as an amplification effect (through the triggering oflimiters) whereas time spectrum variations depend in a more complicated manner on the charge collection in the photomultipliers. The presence of iron in the detector table caused in the abovementioned case differences inside the shielded detectors of approximately 2mOe,which could be reduced by demagnetization. The temperature dependence of the zero point was 15 ps / °c, which prompted the use of a separate ventilation in each detector box.