56 research outputs found
TASISpec—A highly efficient multi-coincidence spectrometer for nuclear structure investigations of the heaviest nuclei
Recoil-α-fission and recoil-α-α-fission events observed in the reaction 48Ca + 243Am
Products of the fusion-evaporation reaction 48Ca + 243Am were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Amongst the detected thirty correlated α-decay chains associated with the production of element Z=115, two recoil-α-fission and five recoil-α-α-fission events were observed. The latter five chains are similar to four such events reported from experiments performed at the Dubna gas-filled separator, and three such events reported from an experiment at the Berkeley gas-filled separator. The four chains observed at the Dubna gas-filled separator were assigned to start from the 2n-evaporation channel 289115 due to the fact that these recoil-α-α-fission events were observed only at low excitation energies. Contrary to this interpretation, we suggest that some of these recoil-α-α-fission decay chains, as well as some of the recoil-α-α-fission and recoil-α-fission decay chains reported from Berkeley and in this article, start from the 3n-evaporation channel 288115
Alpha-Photon Coincidence Spectroscopy Along Element 115 Decay Chains
Produced in the reaction 48Ca+243Am, thirty correlated α-decay chains were observed in an experiment conducted at the GSI Helmholzzentrum für Schwerionenforschung, Darmstadt, Germany. The decay chains are basically consistent with previous findings and are considered to originate from isotopes of element 115 with mass numbers 287, 288, and 289. A set-up aiming specifically for high-resolution charged particle and photon coincidence spectroscopy was placed behind the gas-filled separator TASCA. For the first time, γ rays as well as X-ray candidates were observed in prompt coincidence with the α-decay chains of element 115
On the synthesis of 258Rf via p-deexcitation in the complete fusion reaction 50Ti + 209Bi
Isomers in superheavy nuclei
International audienceAbstractIsomeric states in atomic nuclei are a well-known phenomenon all over the complete chart of nuclei. Their properties deliver valuable information on the structure of the nuclei. A region of specific interest are the very heavy and superheavy nuclei, where the occurrence and properties of isomeric states will have an impact on the prediction of localization and strength of the spherical superheavy proton and neutron shells. In this review, an overview of the present situation is given. Some specific features are discussed for selected examples.</jats:p
Fine structure in the \mth{\alpha}-decay of radium isotopes with mass numbers 209–212
Radium isotopes with mass numbers from 209 to 212
have been produced by heavy-ion fusion reactions
\chem{^{204}Pb}(\chem{^{12}C}, n)\chem{^{216\mbox{-}{\it x}}Ra}. Radioactive decay properties
were investigated by means of -
and --spectroscopy after in-flight separation
of the evaporation residues from
the projectile beam by the velocity filter SHIP and implantation into
a 16-strip position-sensitive Si detector.
For the even-even nuclei Ra we
identified transitions into the first-excited 2-state
of the daughter nuclei
Rn.
Weak transitions into excited levels of the odd-
daughter nuclei Rn were also observed
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