6533b822fe1ef96bd127cd94
RESEARCH PRODUCT
Observation of a dramatic hindrance of the nuclear decay of isomeric states for fully ionized atoms
O. KlepperH.-j. KlugeD. BoutinYu. N. NovikovB. FranzkeTorsten RadonZygmunt PatykM. FalchK. E. G. LöbnerHans GeisselC. ScheidenbergerF. NoldenTh. KerscherJ. StadlmannChristophor KozhuharovF. AttallahHermann WollnikYu. A. LitvinovMarc HausmannK. BeckertF. BoschM. SteckM. B. TrzhaskovskayaG. Münzenbergsubject
PhysicsNuclear and High Energy PhysicsSchottky diodeHighly-charged ionsRing (chemistry)Mass spectrometryHalf-livesStorage ringsInternal conversionFragmentation (mass spectrometry)IonizationNuclideAtomic physicsNuclear ExperimentExotic nucleiRadioactive decaydescription
Abstract The half-lives of isomeric states of fully ionized 144Tb, 149Dy and 151Er have been measured. These nuclides were produced via fragmentation of about 900 MeV/u 209Bi projectiles, separated in flight with the fragment separator (FRS) and stored in the cooler ring (ESR). The decay times of the cooled fragments have been measured with time-resolved Schottky spectrometry. We observed for the first time drastic increases of the half-lives of bare isomers by factors of up to 30 compared to their neutral counterparts. This is due to the exclusion of the strong internal conversion and electron-capture channels in the radioactive decay of these bare nuclei. The experimental results are in good agreement with theoretical calculations.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-10-01 | Physics Letters B |