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Dvorak, J.*; Brchle, W.*; Chelnokov, M.*; Dllmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; Jger, E.*; Krcken, R.*; Kuznetsov, A.*; 永目 諭一郎; et al.
Physical Review Letters, 100(13), p.132503_1 - 132503_4, 2008/04
Cm+Mg反応で生成する108番元素ハッシウム(Hs)同位体の生成断面積を迅速気相化学分離装置COMPACTを用いて測定した。入射重イオンMgのエネルギーを変化させCm(Mg, )反応の励起関数を求めたところ、比較的軽い重イオンとアクチノイドターゲットを組合せた反応、いわゆるHot-fusion反応での3蒸発過程が初めて観測された。この蒸発過程で生成する新しい超重核種Hsを同定することに成功した。
Dvorak, J.*; Brchle, W.*; Chelnokov, M.*; Dllmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; Jger, E.*; Krcken, R.*; Kuznetsov, A.*; 永目 諭一郎; et al.
Physical Review Letters, 100(13), p.132503_1 - 132503_4, 2008/04
被引用回数:125 パーセンタイル:94.89(Physics, Multidisciplinary)By using the complete fusion reaction Mg+Cm, superheavy nuclide Hs was produced in the 3 evaporation channel. The experiment was carried out at UNILAC in GSI, Darmstadt, Germany. The fusion products were separated from other reaction products by using an online chemical separation and detection system. The new isotope Hs (Z=108) was identified by its decay properties and excitation functins as function of bombading energy of Mg, where excitation functions for 4 and 5 channel isotopes Hs were also observed. The Hs was produced at bombarding energy well below the Bass barrier. Because of the prolate deformation of U, Coulomb barrier decreases at polar collisions, allowing the system to fuse even in sub-barrier energies.