The University of Tokyo · Physics and Astronomy
Professor K. Wimmer's research lab specializes in experimental nuclear physics, focusing on the structure and spectroscopy of exotic, neutron- and proton-rich nuclei far from stability. The lab investigates shell evolution, shape coexistence, and isospin symmetry breaking using advanced transfer reactions and inelastic scattering with radioactive ion beams. Key research directions include the study of nuclear collectivity, single-particle excitations, and the limits of nuclear stability through experiments at facilities like REX-ISOLDE. The lab combines innovative inverse-kinematics techniques with theoretical modeling to probe fundamental nuclear forces and collectivity in light to medium-mass nuclei.
Figures are computed from collected data and may differ slightly.
The "island of inversion" nucleus 32 Mg has been studied by a (t, p) two neutron transfer reaction in inverse kinematics at REX-ISOLDE. The shape coexistent excited 0+ state in 32 Mg has been identified by the characteristic angular distribution of the protons of the Δ L=0 transfer. The excitation energy of 1058 keV is much lower than predicted by any theoretical model. The low γ-ray intensity observed for the decay of this 0+ state indicates a lifetime of more than 10 ns. Deduced spectroscopic
We studied the proton-rich T_{z}=-1 nucleus ^{70}Kr through inelastic scattering at intermediate energies in order to extract the reduced transition probability, B(E2;0^{+}→2^{+}). Comparison with the other members of the A=70 isospin triplet, ^{70}Br and ^{70}Se, studied in the same experiment, shows a 3σ deviation from the expected linearity of the electromagnetic matrix elements as a function of T_{z}. At present, no established nuclear structure theory can describe this observed deviation qu
Transfer reactions are a valuable tool to study the single-particle structure of nuclei. At radioactive beam facilities transfer reactions have to be performed in inverse kinematics. This creates a number of experimental challenges, but it also has some advantages over normal kinematics measurements. An overview of the experimental and theoretical methods for transfer reactions, especially with radioactive beams, is presented. Recent experimental results and highlights on shell evolution in exot
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