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Nuclear Data Evaluation for Mass Chain A=217:Odd-Proton Nuclei.

Sherif S Nafee1,2, Salem A Shaheen1, Amir M Al-Ramady3

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This study updates nuclear data for six odd-proton nuclei in the mass chain A=217, including half-lives, gamma transitions, and alpha decay hindrance factors. New decay schemes and conversion electron ratios provide a refined understanding of these isotopes.

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Area of Science:

  • Nuclear Physics
  • Nuclear Structure
  • Radioactive Decay

Background:

  • The mass chain A=217 contains six odd-proton nuclei: Thallium (Tl), Bismuth (Bi), Astatine (At), Francium (Fr), Actinium (Ac), and Protactinium (Pa).
  • Accurate nuclear data is crucial for understanding nuclear structure and decay processes.

Purpose of the Study:

  • To update and present comprehensive nuclear data for the six odd-proton nuclei in the A=217 mass chain.
  • To provide updated decay schemes, half-lives, gamma transitions, and alpha decay hindrance factors.
  • To calculate conversion electron ratios for a more detailed decay analysis.

Main Methods:

  • Adopted half-lives and gamma transitions from recent nuclear data sets (XUNDL).
  • Updated alpha decay energies (Qα) using AME2012 data.
  • Calculated conversion electron ratios using the BrIcc code v2.3.
  • Determined decay hindrance factors (HF) using the ALPHAD program.

Main Results:

  • Presented updated skeleton decay schemes for 217Tl, 217Bi, 217At, 217Fr, 217Ac, and 217Pa.
  • Calculated and reported total conversion electrons and K-, L-, and N-shell conversion electron ratios.
  • Computed decay hindrance factors for alpha decays of 221Fr, 221Ac, and 221Pa.

Conclusions:

  • The study provides an updated and detailed dataset for the investigated nuclei in the A=217 mass chain.
  • The refined nuclear data contributes to a better understanding of radioactive decay properties and nuclear structure.
  • The calculated conversion electron ratios and hindrance factors offer valuable insights for nuclear spectroscopy and theoretical models.