Die Reaktion10B(d,α)8Be im Energiebereich von 0,5 bis 2 MeV

The differential magnetic susceptibility X=X′-iX″ of HoCl₃, Ho(Y)Cl₃, and Ho(La)Cl₃ has been measured with a mutual inductance bridge with frequencies from 5.3 c/s to 5.12 kc/s at temperatures between 1.1 and 4.2 °K, and in constant magnetic fields up to 3 kOe. — In monoclinic HoCl₃ a magnetic transition has been observed atT=2.15 °K (maximum of X″). No transition occurs for 0.5 and 5% Ho³⁺ in isomorphic YCl₃. — The results for nominal concentrations of 1, 2, and 5% Ho³⁺ in hexagonal LaCl₃ indicate, that there is a considerable precipitation of monoclinic HoCl₃ during crystal growth. Relaxation measurements on Ho³⁺ in hexagonal sites are interpreted in terms of a phonon-bottleneck in the temperature region 1.1 °K≦T≦2.0⁰K with a hot-phonon equilibration time of about 0.2 μs.