title: Doubly magic nucleus (108)(270)Hs162.
abstract: Theoretical calculations predict 270Hs (Z=108, N=162) to be a doubly magic deformed nucleus, decaying mainly by alpha-particle emission. In this work, based on a rapid chemical isolation of Hs isotopes produced in the 26Mg+248Cm reaction, we observed 15 genetically linked nuclear decay chains. Four chains were attributed to the new nuclide 270Hs, which decays by alpha-particle emission with Qalpha=9.02+/-0.03 MeV to 266Sg which undergoes spontaneous fission with a half-life of 444(-148)(+444) ms. A production cross section of about 3 pb was measured for 270Hs. Thus, 270Hs is the first nucleus for which experimental nuclear decay properties have become available for comparison with theoretical predictions of the N=162 shell stability.
authors.affiliation: Technische Universität München, D-85748 Garching, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Dvorak
authors.forename: W
authors.initials: W
authors.lastname: Brüchle
authors.forename: M
authors.initials: M
authors.lastname: Chelnokov
authors.forename: R
authors.initials: R
authors.lastname: Dressler
authors.forename: Ch E
authors.initials: ChE
authors.lastname: Düllmann
authors.forename: K
authors.initials: K
authors.lastname: Eberhardt
authors.forename: V
authors.initials: V
authors.lastname: Gorshkov
authors.forename: E
authors.initials: E
authors.lastname: Jäger
authors.forename: R
authors.initials: R
authors.lastname: Krücken
authors.forename: A
authors.initials: A
authors.lastname: Kuznetsov
authors.forename: Y
authors.initials: Y
authors.lastname: Nagame
authors.forename: F
authors.initials: F
authors.lastname: Nebel
authors.forename: Z
authors.initials: Z
authors.lastname: Novackova
authors.forename: Z
authors.initials: Z
authors.lastname: Qin
authors.forename: M
authors.initials: M
authors.lastname: Schädel
authors.forename: B
authors.initials: B
authors.lastname: Schausten
authors.forename: E
authors.initials: E
authors.lastname: Schimpf
authors.forename: A
authors.initials: A
authors.lastname: Semchenkov
authors.forename: P
authors.initials: P
authors.lastname: Thörle
authors.forename: A
authors.initials: A
authors.lastname: Türler
authors.forename: M
authors.initials: M
authors.lastname: Wegrzecki
authors.forename: B
authors.initials: B
authors.lastname: Wierczinski
authors.forename: A
authors.initials: A
authors.lastname: Yakushev
authors.forename: A
authors.initials: A
authors.lastname: Yeremin