This work focuses on new electromagnetic decay mode in nuclear
physics. The first part of the thesis presents the observation of
the two-photon decay for a transition where the one-photon decay is
allowed. In the second part, so called quadrupole mixed-symmetry is
investigated in inelastic proton scattering experiments. In 1930
Nobel-prize winner M. Goeppert-Mayer was the first to discuss the
two-photon decay of an exited state in her doctoral thesis. This
process has been observed many times in atomic physics. However in
nuclear physics data is sparse. Here this decay mode has only been
observed for the special case of a transition between nuclear
states with spin and parity quantum number 0+. For such a
transition, the one-photon decay - the main experimental obstacle
to observe the two-photon decay - is forbidden. Furthermore, the
energy sharing and angular distributions were measured, allowing
conclusions to be drawn about the multipoles contributing to the
two-photon transition. Quadrupole mixed-symmetry states are an
excitation mode in spherical nuclei which are sensitive to the
strength of the quadrupole residual interaction. A new signature
for these interesting states is presented which allows
identification of mixed-symmetry states independently of
electromagnetic transition strengths. Furthermore this signature
represents a valuable additional observable to test model
predictions for mixed-symmetry states.
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