Inelastic neutron scattering (INS) measurements were performed on the LET time-of-flight direct geometry spectrometer at ISIS. The sample (4 g) was contained in a thin aluminum can of diameter 15 mm and height 45 mm and cooled in a helium cryostat. The data were collected at 1.7 K and 25 K, for 10 h and 7 h respectively, with E i = 12.14 meV using the rep-rate multiplication method. The data were reduced using the Mantid-Plot software package. The raw data were corrected for detector efficiency and time independent background following standard procedures.