Half-life measurements of bare, mass-resolved isomers in a storage-cooler ring

Abstract

Secondary beams from fragmentation of "5"8Ni have been produced with energies of 200-220 A.MeV, separated with the fragment separator FRS and injected into the storage-cooler ring ESR for half-life measurements. The relative momentum spread #DELTA#p/p#approx#1.10"-"6 (FWHM) which we achieved allowed us to resolve the ground and isomeric states of cooled "5"2Mn and "5"3Fe nuclei in the measured mass spectra. The circulating beams were fully ionized which rendered possible, for the first time, to measure pure #beta#"+ branches for "5"2"gFe and "5"3"gFe and the sum of pure #beta#"+ and #gamma# branches in the decay of the isomers "5"2"mMn and "5"3"mFe. (orig.)15 refs.Available from TIB Hannover: RO 801(95-53) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman