Center for Quantum Electronics University of Texas at Dallas

Deexcitation of the 31-year isomer of 178Hf with Synchrotron Radiation (SR)

Comparison of results from significant experiments conducted in 2001

Synchrotron

SPring-8, Hyogo, JAPAN

 

APS, Argonne, USA

 
X-ray spectrum Narrowband tunable; DE = 0.5 eV   "White"; DE = ~50,000 eV  
Target parentage

Virgin 75% of 1979 LANL spallation

 

Unknown beamstop

 
Team

"Texas Group:" 15 scientists from 8 Labs in 5 Countries

 

"Argonne Consortium:" 15 scientists from 3 Labs in the US

 
Result

All previous positive results CONFIRMED; 0.2% branch of photoionization at L1 and L3 ionization edges causes decay of isomeric state.

 

Totally negative results; all published positive reports CONTRADICTED.

 
Reference

Europhys. Lett. 57, 677 (2002)

 

PRL 87, 072503 (2001)

 

Please send comments and recommended revisions to:C.B. Collins