Phys.Rev. C 104, 044328 (2021)

M.Piersa-Silkowska, for the IDS Collaboration

First β-decay spectroscopy of ¹³⁵In and new β-decay branches of ¹³⁴In

RADIOACTIVITY ^134,135In(β^-), (β^-n), (β^-2n)[from Ta(p, X), E=1.4 GeV at the ISOLDE-CERN facility, followed by selective ionization using Resonance Ionization Laser Ion Source (RILIS), and separation by mass-to-charge ratio using a General Purpose Separator (GPS), finally transported to ISOLDE Decay Station (IDS)]; measured Eγ, Iγ, β radiation, βγ-, βγγ- and γγ-coin, %β^-n or Pn, %β^-2n or P2n, T_1/2 of decays of ^134,135In, T_1/2 of levels by βγγ(t) using plastic scintillator for β radiation, four HPGe Clover detectors and two LaBr₃(Ce) crystals for γ radiation. ^{132,133,134,135}Sn; deduced levels, J, π, B(E2), configurations. ¹³⁴In; deduced ground state J, π from Gamow-Teller β transitions and shell-model predictions. ¹³⁵In; searched for expected β^--decaying isomer, but no evidence found. ¹³⁵In(β^-3n); searched for β^-3n decay mode as expected, but low statistics prevented confirmed observation. Comparison of level structures of ^134,135Sn with shell-model calculations. ^134,135In; comparison of experimental and theoretical predictions of Pn and P2n values in QRPA, QRPA+HF, RQRPA and effective density model (EDM) calculations. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.104.044328