東京大学 · 物理学・天文学
K. Wimmer教授の研究室は、放射性線を用いた反応実験を通じて、極端に歪んだ形状や殻の崩壊を示す「奇妙核」の構造を解明することを目的としています。特に、逆運動学における2ニュートロン移動反応や、陽子散乱を用いた電磁遷移確率の精密測定により、核の対称性やスロットリング効果の理解を進めています。核殻模型の限界を検証するような異常な励起状態の発見は、理論的枠組みの再考を促す重要な成果を生んでいます。
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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