6533b85efe1ef96bd12c0375

RESEARCH PRODUCT

Fission Barrier of Superheavy Nuclei and Persistence of Shell Effects at High Spin: Cases of 254No and 220Th

Henning GregKhoo T LLopez-martens ASeweryniak DAlcorta MAsai MBack B BBertone P FBoilley DCarpenter M PChiara C JChowdhury PGall BGreenlees P TGürdal GHauschild KHeinz AHoffman C RJanssens R V FKarpov A VKay B PKondev F GLakshmi SLauritsen TLister C JMccutchan E ANair CPiot JPotterveld DReiter PRogers A MRowley NZhu S

subject

superheavy elements[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]fysiikkaComputingMilieux_MISCELLANEOUS27.90.+b 21.10.Hw 24.60.Dr 24.75.+i

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 15ℏ and, by extrapolation, Bf=6.6±0.9  MeV at spin 0ℏ. 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.

yearjournalcountryeditionlanguage
2014-09-08
http://urn.fi/URN:NBN:fi:jyu-201501271183