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Parity Non-Conservation in the Decay of Polarized Isomers in 93Tc: A Unique Case Study

This study investigates parity non-conservation (PNC) in the decay of polarized 17/2- isomers in 93Tc, highlighting a unique case for non-zero PNC. Using advanced techniques at the Weizmann Institute of Science, GSI, and NSCL, we analyze the parity doublet at 300 eV energy proximity. Our findings indicate significant parity mixing effects in electromagnetic and strong decay channels, contributing to the understanding of nuclear weak interactions. Theoretical predictions and empirical corrections are discussed, alongside experimental results that suggest the presence of PNC in nuclear systems.

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Parity Non-Conservation in the Decay of Polarized Isomers in 93Tc: A Unique Case Study

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  1. Parity Non-conservation in the decay of Polarized 17/2- isomers in 93Tc • Weizmann Institute of Science, ISRAEL, GSI, Germany,NSCL, Michigan, USA Parity doublet at 300 eV Proximity. Unique case For non-zero PNC. • Only Few Cases • 18F 90 meV • 19F ~380(100) meV • 21Ne 30 meV • 93Tc ~0.59(19)(25) meV • 180Hf~1.0(0.1) eV PNC in nuclei • Non-leptonic, Non-strangeness changing, Probes Hweak and Establishes IS, IV and IT strengths. • Parity mixing in the energy levels shows up in EM and Strong decay. 93Tc High Spin Isomer: N=50,Well described by Shell model Wave Func.

  2. 45Sc(52Cr, 2p2n)93Tc Elab(93Tc) = 65 MeVChecked with Si-det. M. Hass et al., PLB 371, 25, previous work at SHIP-GSI, RMS-LNL Separates and Tranfers to Focal Plane Area TF technique for Polarization Stepper Motor 2 mins. + 1sec E-degrader 0.2 mg/cm2 to avoid foil stack damage. 0-180° Asmmetry (A) in the M2/E3() -decay due to E2 Componet 16 foils, @70º 15-15 g/cm2

  3. Results Present+PLB, 371, 25: A = 4.8 (2.1). 10-4 , <Hpnc>=0.34(14)(25) meV Theory:1p1/2-0g9/2 withIV strength correction by an empirical factor of 0.15±0.15. <Hpnc> = - 0.2 to 1 meV

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