Published 2014 | Version v1
Journal article Metadata-only

Fission barrier of superheavy nuclei and persistence of shell effects at high spin: cases of 254No and 220Th

Creators

  • 1. Argonne National Laboratory, Argonne, Illinois 60439, (United States)
  • 2. CSNSM, IN2P3-CNRS, and Universite Paris Sud, Bat. 104-108, F-91405 Orsay, (France)
  • 3. Universite de Caen Basse-Normandie, F-14032 Caen Cedex, (France)
  • 4. GANIL, CEA-DSM, and IN2P3-CNRS, B.P. 55027, F-14076 Caen Cedex, (France)

Description

We report on the first measurement of the fission barrier height in a heavy shell-stabilized nucleus. The fission barrier height of 254No is measured to be Bf = 6.0 ± 0.5 MeV at spin 15ℎ and, by extrapolation, Bf = 6.6 ± 0.9 MeV at spin 0 ℎ. This information is deduced from the measured distribution of entry points in the excitation energy versus spin plane. The same measurement is performed for 220Th and only a lower limit of the fission barrier height can be determined: Bf (I) ≥ 8 MeV. Comparisons with theoretical fission barriers test theories that predict properties of superheavy elements. (authors)

Availability note (English)

Available from doi: http://dx.doi.org/10.1103/PhysRevLett.113.262505

Additional details

Identifiers

DOI
10.1103/PhysRevLett.113.262505;

Publishing Information

Journal Title
Physical Review Letters
Journal Volume
113
Journal Page Range
p. 262505.1-262505.6
ISSN
0031-9007

INIS

Country of Publication
United States
Country of Input or Organization
France
INIS RN
48091749
Subject category
S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
Descriptors DEI
ATOMIC NUMBER; CROSS SECTIONS; EXTRAPOLATION; FISSION BARRIER; MONTE CARLO METHOD; NOBELIUM 254; THORIUM 220; TRANSACTINIDE ELEMENTS
Descriptors DEC
ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; BETA DECAY RADIOISOTOPES; CALCULATION METHODS; ELECTRON CAPTURE RADIOISOTOPES; ELEMENTS; ENERGY; EVEN-EVEN NUCLEI; HEAVY NUCLEI; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MATHEMATICAL SOLUTIONS; MICROSECONDS LIVING RADIOISOTOPES; MILLISECONDS LIVING RADIOISOTOPES; NOBELIUM ISOTOPES; NUCLEAR POTENTIAL; NUCLEI; NUMERICAL SOLUTION; POTENTIAL ENERGY; POTENTIALS; RADIOISOTOPES; SECONDS LIVING RADIOISOTOPES; SPONTANEOUS FISSION RADIOISOTOPES; THORIUM ISOTOPES; TRANSPLUTONIUM ELEMENTS; TRANSURANIUM ELEMENTS

Optional Information

Notes
46 refs.