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Title: Doubly Magic Nucleus {sub 108}{sup 270}Hs{sub 162}

Theoretical calculations predict {sup 270}Hs (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 {sup 26}Mg+{sup 248}Cm reaction, we observed 15 genetically linked nuclear decay chains. Four chains were attributed to the new nuclide {sup 270}Hs, which decays by {alpha}-particle emission with Q{sub {alpha}}=9.02{+-}0.03 MeV to {sup 266}Sg which undergoes spontaneous fission with a half-life of 444{sub -148}{sup +444} ms. A production cross section of about 3 pb was measured for {sup 270}Hs. Thus, {sup 270}Hs 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:
; ; ; ; ; ;  [1] ; ; ; ; ;  [2] ; ; ; ;  [3] ;  [4] ;  [5] ;  [6] ; more »;  [7] « less
  1. Technische Universitaet Muenchen, D-85748 Garching (Germany)
  2. Gesellschaft fuer Schwerionenforschung mbH, D-64291 Darmstadt (Germany)
  3. Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation)
  4. Paul Scherrer Institut, CH-5232 Villigen (Switzerland)
  5. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  6. (United States)
  7. Universitaet Mainz, D-55128 Mainz (Germany) (and others)
Publication Date:
OSTI Identifier:
20861474
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Journal Issue: 24; Other Information: DOI: 10.1103/PhysRevLett.97.242501; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA PARTICLES; COLLIDING BEAMS; CROSS SECTIONS; CURIUM 248 TARGET; DEFORMED NUCLEI; EMISSION; HALF-LIFE; HASSIUM 270; MAGIC NUCLEI; MAGNESIUM 26 REACTIONS; MAGNESIUM 26 TARGET; MEV RANGE 01-10; SEABORGIUM 266; SPONTANEOUS FISSION