Production and Decay of Element 114: High Cross Sections and the New Nucleus {sup 277}Hs

Journal Article · Fri Jun 25 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.104.252701· OSTI ID:21410437

Duellmann, Ch E; Schaedel, M; Ackermann, D; Block, M; Bruechle, W; Essel, H G; Hartmann, W; Hessberger, F P; Huebner, A; Jaeger, E; Khuyagbaatar, J; Kindler, B; Krier, J; Kurz, N; Lommel, B; Schausten, B; Schimpf, E; Steiner, J ^[1]; Yakushev, A; Tuerler, A ^[2]

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1. GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt (Germany)
2. Technische Universitaet Muenchen, 85748 Garching (Germany)

The fusion-evaporation reaction {sup 244}Pu({sup 48}Ca,3-4n){sup 288,289}114 was studied at the new gas-filled recoil separator TASCA. Thirteen correlated decay chains were observed and assigned to the production and decay of {sup 288,289}114. At a compound nucleus excitation energy of E*=39.8-43.9 MeV, the 4n evaporation channel cross section was 9.8{sub -3.1}{sup +3.9} pb. At E*=36.1-39.5 MeV, that of the 3n evaporation channel was 8.0{sub -4.5}{sup +7.4} pb. In one of the 3n evaporation channel decay chains, a previously unobserved {alpha} branch in {sup 281}Ds was observed (probability to be of random origin from background: 0.1%). This {alpha} decay populated the new nucleus {sup 277}Hs, which decayed by spontaneous fission after a lifetime of 4.5 ms.

• OSTI ID: 21410437
• Journal Information: Physical Review Letters, Vol. 104, Issue 25; Other Information: DOI: 10.1103/PhysRevLett.104.252701; (c) 2010 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ALPHA DECAY
CALCIUM 48
COMPOUND NUCLEI
COPERNICIUM 277
CROSS SECTIONS
DARMSTADTIUM 281
ELEMENT 114
EXCITATION
ISOTOPE SEPARATORS
LIFETIME
MEV RANGE
PLUTONIUM 244
RECOILS
SPONTANEOUS FISSION
ACTINIDE NUCLEI
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
CALCIUM ISOTOPES
COPERNICIUM ISOTOPES
DARMSTADTIUM ISOTOPES
DECAY
ELEMENTS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EQUIPMENT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FISSION
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
ISOTOPES
MICROSECONDS LIVING RADIOISOTOPES
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
PLUTONIUM ISOTOPES
RADIOISOTOPES
SEPARATION EQUIPMENT
SPONTANEOUS FISSION RADIOISOTOPES
STABLE ISOTOPES
TRANSACTINIDE ELEMENTS
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
YEARS LIVING RADIOISOTOPES