Superheavy-element spectroscopy: Correlations along element 115 decay chains
نویسندگان
چکیده
Following a brief summary of the region of the heaviest atomic nuclei yet created in the laboratory, data on more than hundred α-decay chains associated with the production of element 115 are combined to investigate time and energy correlations along the observed decay chains. Several of these are analysed using a new method for statistical assessments of lifetimes in sets of decay chains.
منابع مشابه
Spectroscopy of element 115 decay chains.
A high-resolution α, x-ray, and γ-ray coincidence spectroscopy experiment was conducted at the GSI Helmholtzzentrum für Schwerionenforschung. Thirty correlated α-decay chains were detected following the fusion-evaporation reaction 48Ca + 243Am. The observations are consistent with previous assignments of similar decay chains to originate from element Z=115. For the first time, precise spectrosc...
متن کاملGamma-Ray Spectroscopy of Nuclei Along the Z=115 Decay Chain
During the past decade correlated α-decay chains have been observed in several independent experiments using Ca-induced fusion-evaporation reactions on actinide targets [1]. These are interpreted to originate from the production of isotopes with proton numbers Z = 113-118. In a recent experiment at the GSI Helmholtzzentrum für Schwerionenforschung GmbH in Darmstadt, Germany, using the reaction ...
متن کاملExploring the island of superheavy elements
Over the last thirty years, experimentalists have, so to speak, launched an expedition to explore the predicted “island of superheavy elements”—a region of increasingly stable nuclei around atomic number 114 (Fig. 1). So far they have reported, on average, the discovery of one new element every two and a half years. Now, a Russian-American collaboration headed by Yuri Oganessian at the Joint In...
متن کاملOn Nuclear Matrix Element Uncertainties in Short Range 0νββ Decay Neutrinoless Double Beta Decay Corresponds to the Lepton-number Converting Process
The evaluation of short range contributions to neutrinoless double beta decay has been challenged due to critics of the ansatz of the nuclear matrix element calculations. We comment on the critics and uncertainties of these calculations and the effect on the derived limits. A Z+2 X + 2e −. (1) So far no positive signal for this decay has been observed, yielding the most stringent limit on the e...
متن کاملOn Nuclear Matrix Element Uncertainties in Short Range 0νββ Decay Neutrinoless Double Beta Decay
The evaluation of short range contributions to neutrinoless double beta decay has been challenged due to critics of the ansatz of the nuclear matrix element calculations. We comment on the critics and uncertainties of these calculations and the effect on the derived limits. A Z+2 X + 2e − (1) has been proven to be one of the most sensitive tools to search for particle physics beyond the standar...
متن کامل