Abstract
The N=Z nucleus 64Ge has been investigated in two experiments using the EUROBALL III and EUROBALL IV spectrometers coupled to ancillary devices. Multipole mixing ratios, linear polarization and picosecond lifetimes for various transitions have been measured. The linear polarization results determine unambiguously the multipole character of the 5−→4+ 1665 keV transition, allowing to extract the electric dipole strength and to investigate for the first time the amount of isospin mixing implied by the presence of a forbidden E1 transition.
Highlights
The N = Z nucleus 64Ge has been investigated in two experiments using the EUROBALL III and EUROBALL IV spectrometers coupled to ancillary devices
One of the challenges of modern nuclear physics is the exploration of the limits of validity of the isospin symmetry for increasing values of Z and A
A possible way of studying the violation of isospin symmetry induced by the Coulomb interaction is the observation of E1 transitions in even–even N = Z nuclei
Summary
It was not possible to determine the multipole mixing ratio δ of the 1665 keV transition, which was assigned a stretched electric dipole character with δ ≈ 0 on the basis of systematics arguments. Since the measurement of this parameter is of paramount importance in order to firmly extract the electric dipole strength, we have investigated the angular distribution and the linear polarization of the 1665 keV transition deexciting the negative-parity band in 64Ge. Two experiments have been performed with the goal to study isospin mixing in 64Ge. The first one was performed at the Laboratori Nazionali di Legnaro using the EUROBALL III γ -ray spectrometer coupled to the ISIS Si-ball [10] and to the neutron–wall described in [11].
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