We present the results from an experiment dedicated to measure the lifetime of the 2 + 2 state, candidate for the one-phonon mixed-symmetry state, of 208 Po. This nucleus was studied in the α-transfer reaction 204 Pb( 12 C, 8 Be) 208 Po and the lifetime of the 2 + 2 state was determined by utilizing the Doppler-shift attenuation method. The experimental data show that the 2 + 2 state decays with a sizable M 1 transition to the 2 + 1 state revealing its isovector nature. Keywords Lifetimes • Electromagnetic transitions • Transfer reactions • 190≤ A ≤219

The lifetimes of the 2 + 1 and 4 + 1 states of 208 Po were measured in the α-transfer reaction 204 Pb( 12 C, 8 Be) 208 Po by γ-ray spectroscopy utilizing the recoil distance Doppler Shift method. The newly extracted transition strengths alongside with ones of the decay of 2 + 2 state were compared to the results of large-scale shell-model calculations using an effective interaction derived from the realistic CD-Bonn nucleon-nucleon potential. The comparison indicates the importance of the quadrupole isovector excitations in the valence shell for a fine tuning of the two-body matrix elements of the shell-model interaction.

Using the survey method, a study of Judo coach opinion in Bulgaria on the need to introduce a Judo training methodology for different ages, particularly for children aged 7 to 10, was conducted. Several statistical methods have been used. The results of the study were processed in percentage by the Excel program and presented graphically. The study shows that most judo specialists are convinced that it is necessary to develop a teaching and training methodology for all ages and especially for children. Experts also give their opinion on the important aspects of the training that should be included in the training methodology.