New Superheavy Element Isotopes: 242Pu(48Ca,5n)285114

Journal Article · Fri Oct 22 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.105.182701· OSTI ID:1000353

Ellison, Paul A; Gregorich, Kenneth E; Berryman, Jill S; Bleuel, Darren L; Clark, Roderick M; Dragojevic, Irena; Dvorak, Jan; Fallon, Paul; Fineman-Sotomayor, Carolina; Gates, Jacklyn M; Gothe, Oliver R; Lee, I-Yang; Loveland, Walter D; McLaughlin, Joseph P; Paschalis, Stefanos; Petri, Marina-Kalliopi; Qian, Jing; Stavsetra, Liv; Wiedeking, Mathis; Nitsche, Heino

The new, neutron-deficient, superheavy element isotope {sup 285}114 was produced in {sup 48}Ca irradiations of {sup 242}Pu targets at a center-of-target beam energy of 256 MeV (E* = 50 MeV). The {alpha} decay of {sup 285}114 was followed by the sequential {alpha} decay of four daughter nuclides, {sup 281}Cn, {sup 277}Ds, {sup 273}Hs, and {sup 269}Sg. {sup 265}Rf was observed to decay by spontaneous fission. The measured {alpha}-decay Q values were compared with those from a macroscopic-microscopic nuclear mass model to give insight into superheavy element shell effects. The {sup 242}Pu({sup 48}Ca,5n){sup 285}114 cross section was 0.6{sub -0.5}{sup +0.9} pb.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Nuclear Science Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1000353
• Report Number(s): LBNL-4049E
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 105; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CROSS SECTIONS
DECAY
Element 114
285-114
copernicium-281
281Cn
darmstadtium-277
277Ds
hassium-273
273Hs
seaborgium-269
269Sg
rutherfordium-265
265Rf
ISOTOPES
SPONTANEOUS FISSION
TARGETS
TRANSACTINIDE ELEMENTS