Download PDF by Christopher Walz: The Two-Photon Decay of the 11-/2 Isomer of 137Ba and

By Christopher Walz

ISBN-10: 3319271814

ISBN-13: 9783319271811

ISBN-10: 3319800868

ISBN-13: 9783319800868

This work makes a speciality of new electromagnetic decay mode in nuclear physics. the 1st a part of the thesis offers the statement of the two-photon decay for a transition the place the one-photon decay is permitted. within the moment half, so known as quadrupole mixed-symmetry is investigated in inelastic proton scattering experiments. In 1930 Nobel-prize winner M. Goeppert-Mayer used to be the 1st to discuss the two-photon decay of an exited kingdom in her doctoral thesis. This strategy has been saw again and again in atomic physics. even if in nuclear physics information is sparse. the following this decay mode has in basic terms been saw for the certain case of a transition among nuclear states with spin and parity quantum quantity 0+. For this type of transition, the one-photon decay – the most experimental concern to watch the two-photon decay – is forbidden. in addition, the strength sharing and angular distributions have been measured, allowing conclusions to be drawn about the multipoles contributing to the two-photon transition. Quadrupole mixed-symmetry states are an excitation mode in round nuclei that are delicate to the energy of the quadrupole residual interplay. a brand new signature for those attention-grabbing states is provided which allows identification of mixed-symmetry states independently of electromagnetic transition strengths. moreover this signature represents a necessary extra observable to check version predictions for mixed-symmetry states.

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