Bridging the nuclear structure gap between stable and super heavy nuclei

安定核と超重核の間の未知の核構造を明らかにする

Seweryniak, D.*; Khoo, T. L.*; Ahmad, I.*; Kondev, F. G.*; Robinson, A.*; Tandel, S. K.*; 浅井 雅人  ; Back, B. B.*; Carpenter, M. P.*; Chowdhury, P.*; Davids, C. N.*; Eeckhaudt, S.*; Greene, J. P.*; Greenlees, P. T.*; Gros, S.*; Hauschild, K.*; Heinz, A.*; Herzberg, R.-D.*; Janssens, R. V. F.*; Jenkins, D. G.*; Jones, G. D.*; Ketelhut, S.*; Lauritsen, T.*; Lister, C. J.*; Lopez-Martens, A.*; Marley, P.*; McCutchan, E. A.*; 中務 孝*; Papadakis, P.*; Peterson, D.*; Qian, J.*; Rostron, D.*; Stefanescu, I.*; Tandel, U. S.*; Wang, X. F.*; Zhu, S. F.*

Seweryniak, D.*; Khoo, T. L.*; Ahmad, I.*; Kondev, F. G.*; Robinson, A.*; Tandel, S. K.*; Asai, Masato; Back, B. B.*; Carpenter, M. P.*; Chowdhury, P.*; Davids, C. N.*; Eeckhaudt, S.*; Greene, J. P.*; Greenlees, P. T.*; Gros, S.*; Hauschild, K.*; Heinz, A.*; Herzberg, R.-D.*; Janssens, R. V. F.*; Jenkins, D. G.*; Jones, G. D.*; Ketelhut, S.*; Lauritsen, T.*; Lister, C. J.*; Lopez-Martens, A.*; Marley, P.*; McCutchan, E. A.*; Nakatsukasa, Takashi*; Papadakis, P.*; Peterson, D.*; Qian, J.*; Rostron, D.*; Stefanescu, I.*; Tandel, U. S.*; Wang, X. F.*; Zhu, S. F.*

陽子数100,中性子数152近傍の原子核における一粒子軌道エネルギーの実験値は、超重核領域の殻構造を予測する理論計算の検証に重要な役割を果たす。われわれはNo及びNoに2準粒子状態の高K核異性体を観測し、それらのエネルギーから陽子数100近傍における陽子の一粒子軌道エネルギーを評価することに成功した。またRfに3準粒子状態の高K核異性体を発見し、Rfの崩壊の実験データから中性子の一粒子軌道エネルギーも評価した。得られた実験値をさまざまな理論計算の予測値と比較した結果、Woods-Saxonポテンシャルを用いた計算が最もよく実験値を再現することを見いだした。

Experimental data on single-particle energies in nuclei around Z=100 and N=152 play an important role to test validity of theoretical predictions for shell structure of superheavy nuclei. We found high-K two-quasiparticle isomers in No and No, and evaluated energies of proton single-particle orbitals around Z=100. We also found a new high-K three quasiparticle isomer in Rf. Energies of neutron single-particle orbitals were also evaluated from experimental data of the decay of Rf. Comparisons between the present experimental data and various theoretical calculations for the proton single-particle orbitals indicate that the calculation by using the Woods-Saxon potential gives the best agreement with the data.