Abstract
In this work we present the results from two experiments dedicated to search for quadrupolecollective isovector valence-shell excitation, the states with so-called mixed proton-neutron symmetry (MSS), in nuclei around the doubly magic nucleus 208Pb. 212Po was studied in an α-transfer reaction. 204Hg was studied in an inverse kinematics Coulomb excitation reaction on a carbon target. Both experiments provide indications for existence of one-phonon MSSs. Those are the first experimentally identified MSSs in the mass A ≈ 208 region.
Highlights
States with mixed proton-neutron symmetry (MSSs) are the lowest-lying isovector excitations in the valence shell [1] for vibrational nuclei
The opposite case of well pronounced Configurational Isospin Polarization (CIP) is expected for 136Te [15] due to the expectation that the p − n exchange symmetry is strongly broken as Te and Xe isotopes depart from doubly magic 132Sn [16]
In this contribution we present the preliminary results from two such experiments that indicate existence of one-phonon MSSs in 212Po and 204Hg
Summary
States with mixed proton-neutron symmetry (MSSs) are the lowest-lying isovector excitations in the valence shell [1] for vibrational nuclei. It has been shown that the one-phonon FS and MS states result from coupling of the lowest 2-quasiparticle proton and neutron excitations to the Giant Quadrupole Resonance (GQR).
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