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Observation of the 3$$n$$ evaporation channel in the complete hot-fusion reaction $$^{26}$$Mg+$$^{248}$$Cm leading to the new superheavy nuclide $$^{271}$$Hs

完全融合反応$$^{26}$$Mg+$$^{248}$$Cmの3$$n$$蒸発過程によって生成される超重元素の新同位体$$^{271}$$Hsの合成

Dvorak, J.*; Br$"u$chle, W.*; Chelnokov, M.*; D$"u$llmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; J$"a$ger, E.*; Kr$"u$cken, R.*; Kuznetsov, A.*; 永目 諭一郎; Nebel, F.*; 西尾 勝久; Perego, R.*; Qin, Z.*; Sch$"a$del, M.*; Schausten, B.*; Schimpf, E.*; Schuber, R.*; Semchenkov, A.*; Th$"o$rle, P.*; T$"u$rler, A.*; Wegrzecki, M.*; Wierczinski, B.*; Yakushev, A.*; Yeremin, A.*

Dvorak, J.*; Br$"u$chle, W.*; Chelnokov, M.*; D$"u$llmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; J$"a$ger, E.*; Kr$"u$cken, R.*; Kuznetsov, A.*; Nagame, Yuichiro; Nebel, F.*; Nishio, Katsuhisa; Perego, R.*; Qin, Z.*; Sch$"a$del, M.*; Schausten, B.*; Schimpf, E.*; Schuber, R.*; Semchenkov, A.*; Th$"o$rle, P.*; T$"u$rler, A.*; Wegrzecki, M.*; Wierczinski, B.*; Yakushev, A.*; Yeremin, A.*

By using the complete fusion reaction $$^{26}$$Mg+$$^{248}$$Cm, superheavy nuclide $$^{271}$$Hs was produced in the 3$$n$$ 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 $$^{271}$$Hs (Z=108) was identified by its $$alpha$$ decay properties and excitation functins as function of bombading energy of $$^{26}$$Mg, where excitation functions for 4$$n$$ and 5$$n$$ channel isotopes $$^{270,269}$$Hs were also observed. The $$^{271}$$Hs was produced at bombarding energy well below the Bass barrier. Because of the prolate deformation of $$^{238}$$U, Coulomb barrier decreases at polar collisions, allowing the system to fuse even in sub-barrier energies.

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パーセンタイル:5.03

分野:Physics, Multidisciplinary

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