Reinvestigation of direct two-proton radioactivity of ^94Ag^m (J^π= 21^+, 6.7 MeV)

Details Reinvestigation of direct two-proton radioactivity of ^94Ag^m (J^π= 21^+, 6.7 MeV) Reinvestigation of direct two-proton radioactivity of ^94Ag^m (J^π= 21^+, 6.7 MeV)

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..aprm14003c&link_type=abstract

American Physical Society, 2008 APS April Meeting and HEDP/HEDLA Meeting, April 11-15, 2008, abstract #M14.003

Physics

Scientific paper

Both direct one-proton decay and direct two-proton decay of ^94Ag^m from this long-lived (0.4 s) isomeric state have been reported by Mukha et al. in experiments performed with the GSI on-line mass separator [1]. In the former decay, two proton groups with energies of 0.79 and 1.01 MeV were observed, each having a branching ratio of about 2%; in the latter decay, coincident events with a threshold energy of 0.4 MeV and a summed decay energy of 1.9 MeV were observed in coincidence with γ-decays in the ^92Rh daughter and were assigned to be coincident protons with a branching ratio of 0.5(3)%. We have recently utilized our helium-jet system at the Berkeley 88-inch cyclotron to repeat this experiment, again employing the ^58Ni(^40Ca,p3n) reaction at 192 MeV. Reaction products were transported via a capillary to a detection area and collected on a slowly rotating wheel in front of an assembly of 24 δEgas-δEgas - ESi detector telescopes with a threshold of 0.4 MeV for identifying protons. The beta-particle background is reduced enough in several of these telescopes to clearly observe the 0.79 MeV single proton decay from ^94Ag^m. Data analysis is continuing and results of the search for coincident, identified protons will be presented. [1] Mukha et al., Nature 439, 298 (2006) and references therein.

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