Parity Violation in the Compound Nucleus

1. G. E. Mitchell North Carolina State University Parity Violation in the Compound Nucleus

2. SYMMETRY BREAKING, RMT AND NUCLEI • USE NUCLEUS AS TEST LABORATORY FOR RMT PREDICTIONS • ASSUME RMT TO INTERPRET NUCLEAR PHENOMENA • ISOSPIN SYMMETRY BREAKING EFFECT ON LEVEL STATISTICS EFFECT ON TRANSITIONS • PARITY VIOLATION ENHANCEMENT IN COMPOUND NUCLEUS

3. FOLLOWING • WU-AMBLER, GARWIN-LEDERMAN • MANY STUDIES OF PARITY VIOLATION IN STRONG INTERACTION • PROCESSES • CONFLICTING RESULTS (MAINLY RUSSIAN) IN NEUTRON-INDUCED REACTIONS LOOKING AT GAMMA RAYS • FINNALY AT ILL VERY LARGE NEUTRON SPIN ROTATION • CONFUSION • EXTREME EXAMPLE • RESORT TO FIFTH FORCE • EXPLANATION • SUSHKOV-FLAMBAUM • OBSERVATION OF LARGE PARITY VIOLATION IN NEUTRON RESONANCES IN 139LA FRANK LABORATORY, DUBNA • THEN WE STARTED TRIPLE COLLABORATION

13. p-wave level  • s-wave levels many levels contribute PNC asymmetry) x neutron decay amplitude • Ex resonance energies • V matrix element of PNC interaction between levels  and 

14. One measured variable p • many matrix elements V • A known • Assume V independent Gaussian • Random variables with mean zero and variance Mj2 • Mj2 is the weak interaction mean squared matrix element • p is sum of variables V with constant coefficients • Therefore p is Gaussian random variable with variance Mj2A2 • Determine Mj2 from experimental data

18. SIGN CORRELATIONEXPLANATIONS AUERBACH DESPLANQUES FLAMBAUM HAYES KERMAN KOONIN WEIDENMUELLER ET AL.

19. NO SUCH EFFECT IN ALL OTHER MEASUREMENTS FOR 15 NUCLEI EXTENDED MEASUREMENTS TO HIGHER ENERGIES OBSERVED OPPOSITE SIGN FOR PV BEST GUESS LOCAL DOORWAY CONSISTENT WITH KERMAN’S VIEW

24. GENERAL OVERVIEW G.E.MITCHELL AND H.A. WEIDENMUELLER REV.MOD.PHYS. 71,445 (1999)‏ ALL THE DETAILS G.E.MITCHELL, J.D.BOWMAN, S.I.PENTTILA, E.I.SHARAPOV PHYS. REPORTS 354, 157 (2001)‏