Étude des moments angulaires des niveaux du 215Po par une méthode de corrélations angulaires

High alignment following219Rn and211Bi decays

“…The form of G K can be written explicitly for dipole/quadrupole radiation from Fagg (3.11) The most general theoretical form of P(θ) for mixed dipole/quadrupole transitions, allowing all physical values of a 2 and a 4 and using trigonometric equalities to expand P K (2) (cosθ) and P K (cosθ) has been given by Jones [10].…”

“…The corresponding α-γ -ray linear polarization angular distribution has also been measured by Krien et al [4]. Unfortunately, an extensive theoretical analysis by Krien et al [4] of the combined angular correlation measurements of Letessier et al [2] and the linear polarization measurements of Krien et al [4] was unable to produce the correct spins for the decay sequence. The spins given above are taken from the work of compilers [3] and consequently the analysis presented in section 4 is the first using the correct spin sequence.…”

“…So, not only does one have a non-favoured α-transition one should also have a relatively small core quadrupole moment. Experimental α-γ angular correlation measurements have been reported [2,3] for the 219 Rn (ground state) 5 2 + α → 215 Po * (402 keV) 5 2 + γ (E2)…”

“…Experimental α-γ angular correlation measurements have been reported [2,3] for the 219 Rn (ground state) 215 Po * (402 keV)…”

“…The upper boundary lines are defined by the condition w(5/2) = 0, the lower boundary lines by the condition w(3/2) = 0 for any given w(1/2). The labelled points are determined by least squares fits to the data of, [point a] Hesselink[3] and [point b] Letessier et al[2] assuming aligned systems with population parameters as variables.…”