Observation of the 3
evaporation channel in the complete hot-fusion reaction
Mg+
Cm leading to the new superheavy nuclide
Hs
完全融合反応
Mg+
Cmの3
蒸発過程によって生成される超重元素の新同位体
Hsの合成
Dvorak, J.*; Br
chle, W.*; Chelnokov, M.*; D
llmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; J
ger, E.*; Kr
cken, R.*; Kuznetsov, A.*; 永目 諭一郎
; Nebel, F.*; 西尾 勝久
; Perego, R.*; Qin, Z.*; Sch
del, M.*; Schausten, B.*; Schimpf, E.*; Schuber, R.*; Semchenkov, A.*; Th
rle, P.*; T
rler, A.*; Wegrzecki, M.*; Wierczinski, B.*; Yakushev, A.*; Yeremin, A.*
Dvorak, J.*; Br
chle, W.*; Chelnokov, M.*; D
llmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; J
ger, E.*; Kr
cken, R.*; Kuznetsov, A.*; Nagame, Yuichiro; Nebel, F.*; Nishio, Katsuhisa; Perego, R.*; Qin, Z.*; Sch
del, M.*; Schausten, B.*; Schimpf, E.*; Schuber, R.*; Semchenkov, A.*; Th
rle, P.*; T
rler, A.*; Wegrzecki, M.*; Wierczinski, B.*; Yakushev, A.*; Yeremin, A.*
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.