6533b7d8fe1ef96bd126ac5d

RESEARCH PRODUCT

Production and Decay of Element 114: High Cross Sections and the New NucleusHs277

J. M. GatesDirk RudolphDieter AckermannBirgit KindlerPetra Thörle-pospiechJ. SteinerJ. P. OmtvedtR. GraegerB. SchaustenM. WegrzeckiCh. E. DüllmannF. P. HeßbergerBettina LommelJuha UusitaloKlaus EberhardtAlexander YakushevMatthias SchädelP. A. EllisonN. KurzA. SemchenkovJ. KrierJ. V. KratzJulia EvenNorbert WiehlEgon JägerR.-d. HerzbergSusanta LahiriW. HartmannJörg RunkeW. BrüchleE. SchimpfAndreas TürlerMoumita MaitiK. E. GregorichA. V. GorshkovJadambaa KhuyagbaatarD. LiebeH. G. EsselA. HuebnerHeino NitscheE. ParrL. L. AnderssonJ. DvorakD. HildMichael Block

subject

Nuclear reactionNuclear physicsCluster decayIsotopeFissionGeneral Physics and AstronomyDecay chainAlpha decayAtomic physicsRadioactive decaySpontaneous fission

description

The fusion-evaporation reaction Pu-244(Ca-48, 3-4n)(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 (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(-3.1)(+3.9) pb. At E* = 36.1-39.5 MeV, that of the 3n evaporation channel was 8.0-(+7.4)(4.5) pb. In one of the 3n evaporation channel decay chains, a previously unobserved alpha branch in (281)Ds was observed ( probability to be of random origin from background: 0.1%). This alpha decay populated the new nucleus (277)Hs, which decayed by spontaneous fission after a lifetime of 4.5 ms.

yearjournalcountryeditionlanguage
2010-06-21Physical Review Letters
https://doi.org/10.1103/physrevlett.104.252701