Phys. Rev. Lett. 103, 152502 (2009) [4 pages]Reinvestigation of the Direct Two-Proton Decay of the Long-Lived Isomer 94Agm [0.4 s, 6.7 MeV, (21+)]Received 5 March 2009; published 9 October 2009 An attempt to confirm the reported direct one-proton and two-proton decays of the (21+) isomer at 6.7(5) MeV in 94Ag has been made. The 0.39(4) s half-life of the isomer permitted use of a helium-jet system to transport reaction products from the 40Ca+natNi reaction at 197 MeV to a low-background area; 24 gas ΔE-(Si)E detector telescopes were used to identify emitted protons down to 0.4 MeV. No evidence was obtained for two-proton radioactivity with a summed energy of 1.9(1) MeV and a branching ratio of 0.5(3)%. Two groups of one-proton radioactivity from this isomer had also been reported; our data confirm the lower energy group at 0.79(3) MeV with its branching ratio of 1.9(5)%. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.152502
DOI:
10.1103/PhysRevLett.103.152502
PACS:
23.50.+z, 21.10.−k, 21.60.Cs, 27.60.+j
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.