Parity Non-conservation in the decay of Polarized 17/2
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Parity Non-conservation in the decay of Polarized 17/2 - isomers in 93 Tc. 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 18 F  90 meV 19 F ~380(100) meV 21 Ne  30 meV

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PNC in nuclei

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Pnc in nuclei

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.


Pnc in nuclei

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


Results

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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