Abstract
Thallium (, Bismuth (), Astatine (), Francium (), Actinium () and Protactinium () are of odd-proton numbers among the mass chain A = 217. In the present work, the half-lives and gamma transitions for the six nuclei have been studied and adopted based on the recently published interactions or unevaluated nuclear data sets XUNDL. The Q (α) has been updated based on the recent published work of the Atomic Mass Evaluation AME2012 as well. Moreover, the total conversion electrons as well as the K-Shell to L-Shell, L-Shell to M-Shell and L-Shell to N-Shell Conversion Electron Ratios have been calculated using BrIcc code v2.3. An updated skeleton decay scheme for each of the above nuclei has been presented here. The decay hindrance factors (HF) calculated using the ALPHAD program, which is available from Brookhaven National Laboratory’s website, have been calculated for the α- decay data sets for 221Fr-, 221Ac- and 221Pa- α-decays.
Highlights
Alvarez-Pol et al, [1] identified 217Tl from the 9Be(238U, x) reaction when a 1 GeV/nucleon beam from the SIS18 synchrotron at the Gesellschaft für Schwerionenforschung (GSI), Germany at an intensity of 1.5 ×109 ions/spill bombarded a 9Be target of 2500 gm/cm2
The 217Tl isotope was separated by means of a high resolving power magnetic spectrometer Fragment Separator (FRS)
This paper presents the results of the evaluations of the odd-proton nuclei among the members of the mass chain A = 217 (217Tl, 217Bi, 217At), 217Fr, 217Ac and 217Pa), which have been performed in the frame of the King Abdulaziz City for Science and Technology (KASCT) Research Contract no. 11-MAT2037-03, using the procedures adopted by the DDEP working group
Summary
Alvarez-Pol et al, [1] identified 217Tl from the 9Be(238U, x) reaction when a 1 GeV/nucleon beam from the SIS18 synchrotron at the Gesellschaft für Schwerionenforschung (GSI), Germany at an intensity of 1.5 ×109 ions/spill bombarded a 9Be target of 2500 gm/cm. The 217Tl isotope was separated by means of a high resolving power magnetic spectrometer Fragment Separator (FRS). Two plastic scintillators and two multisampling ionization chambers were used to identify the nuclide based on the magnetic rigidity, time–of -flight, energy loss and atomic number. The discovery of the 217Bi isotope was attributed to Pfützner et al, [2] using the same facility. The spectrum was investigated by means of γ-γ, α-γ coincidence and spectrum-multiscaling measurements [3]. The RISING array of 15 Ge clusters was used to detect the γ- rays.
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