Calendar: 1966-1967 Page 404

Annual Report of the Delegacy lxxix the spectra of crystalline solids to be fully analysed High-pressure studies of the spectra of impurity centres in crystals are yielding new and valuable results Professor Domb's theoretical group collaborated with various laboratories where experimental work was being carried out on critical phenomena connected with ferromagnetism and antiferromagnetism properties of fluids and low-temperature magnetic order Several theoretical predictions were confirmed by experiment and new theoretical investigations stimulated by experimental results In par- ticular the rd power law for the susceptibility of ferromagnets above the Curie temperature and the behaviour of the specific heat of liquid argon near its critical temperature were explained The contributions of the group to the statistical mechanics of polymer chains increased steadily and collaboration with the National Physical Laboratory on basic configurational problems in several different fields continued The work in Professor Champion's group continued on the study of the defect properties of diamond and magnesium oxide In particular striking progress was made in the study of the luminescence and infra- red absorption of highly doped synthetic material The nuclear physics group under Dr Burge continued its pro- gramme of measurements of the scattering of 50-MeV protons at the Rutherford High Energy Laboratory at Chilton Elastic and inelastic scattering measurements were made on Zn64 66168 C12 and O16 Equip- ment was constructed for the measurement of the polarization pro- duced in the scattering of 50-MeV protons using the high-resolution ΝI magnet The atmospherics and radiophysics group under Dr Chapman made observations of atmospheric noise and ionospheric propagation conditions as part of the United Kingdom contribution to the IQSY This work involved the continued operation of the sub-station in Jersey second sub-station at Goonhilly Downs Cornwall where facilities were generously provided by the Chief Engineer considerably extended the activity of the group particularly in making observations of geomagnetic micropulsations Theoretical and ex- perimental studies were made on earth-ionosphere cavity resonances the effect of ionospheric profiles on propagation and polarisation properties Professor Sao and Dr Westerlund worked respectively on the magnetic field effect on ELF propagation and on atmospheric auroral noise Mr Curling collaborated with the Electrical Engineering