Abstract
Measurements of prompt γ rays in coincidence with isotopically-identified fission fragments, produced in collisions of 238U on a 9Be target, at an energy around the Coulomb barrier are reported. This technique provides simultaneous access to the spectroscopy of many nuclei, extending to very neutron-rich isotopes and fairly high angular momenta. The structural evolution of the neutron-rich zirconium isotopes is discussed in the light of the present measurements in Zr105,106 and in the context of the interacting boson model with a global parameterization that includes triaxiality but no shape coexistence.
Highlights
Measurements of prompt γ rays in coincidence with isotopically-identified fission fragments, produced in collisions of 238U on a 9Be target, at an energy around the Coulomb barrier are reported
The structural evolution of the neutron-rich zirconium isotopes is discussed in the light of the present measurements in 105,106Zr and in the context of the interacting boson model with a global parameterization that includes triaxiality but no shape coexistence
Several hundreds of nuclei around and far from the valley of stability are produced, with comparable excitation energies and fairly high angular momenta. These nuclei exhibit a variety of phenomena ranging from single-particle excitations near shell closures to collectivity resulting in vibrations or deformations, and can be used to probe the evolution of nuclear structure as a function of energy, angular momentum, and isospin
Summary
Measurements of prompt γ rays in coincidence with isotopically-identified fission fragments, produced in collisions of 238U on a 9Be target, at an energy around the Coulomb barrier are reported. The structural evolution of the neutron-rich zirconium isotopes is discussed in the light of the present measurements in 105,106Zr and in the context of the interacting boson model with a global parameterization that includes triaxiality but no shape coexistence.
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