transition interdite

[1997] [Search and Discovery] Atomic Parity Experiment Has Its Moment ; Barbara Goss Levi ; Physics Today 50 (avr 1997) p. 17 [lien]
[2011] [Search and Discovery] Precision spectroscopy reveals a highly forbidden electronic transition in helium ; R. Mark Wilson ; Physics Today 64 (sep 2011) p. 17 [lien]