Alpha-Photon Coincidence Spectroscopy Along Element 115 Decay Chains

Abstract

Alpha-Photon Coincidence Spectroscopy Along Element 115 Decay ChainsRudolph, Dirk; Forsberg, Ulrika; Golubev, Pavel; Sarmiento Pico, Luis; Yakushev, A.; Andersson, L.-L.; Di Nitto, A.; Düllmann, Ch.E.; Gates, J.M.; Gregorich, K.E.; Gross, C.J.; Herzberg, R. Produced in the reaction48 Ca+ 243 Am, 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.

Ca48+Bk249Fusion Reaction Leading to ElementKhuyagbaatar1, Yakushev2, Düllmann3 et al. 2014Phys. Rev. Lett.Self Cite

“…The identification and assignment of nuclear α-decay chains of the odd-Z elements 115 [7,16,19] and 117 [20][21][22][23] is more difficult compared to that of the even-Z ones. They include more complex α-decay patterns and often longer half-lives, T 1=2 .…”

Decay spectroscopy of element 115 daughters:Rg280→Mt276andMtGates1, Gregorich2, Gothe3 et al. 2015Phys. Rev. CSelf Cite522200View full textAdd to dashboardCite

“…Recent publications, [9,18], report on results of decay spectroscopy performed at GSI, for isotopes populated along decay chains presumed to originate from the 243 Of interest in Ref [9] are the first candidates for K x-rays, assigned in the decay step 276 Mt →…”

Spectroscopy and GEANT4 Simulations of Element 115 Decay Chains

“…If the γ-ray transitions had M1 character instead, the simulation would suggest the detection of K α X rays, because M1 transitions with energies just above the K-binding energy are highly converted. This, in turn, would have been the ideal case for X-ray fingerprinting of superheavy elements, while the proposed E1 character implies very interesting nuclear structure physics [2,19,20].…”