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RESEARCH PRODUCT
Prompt and delayed spectroscopy ofAt199
Catherine ScholeyPanu RahkilaUlrika JakobssonPeter M. JonesMikael SandzeliusBo CederwallK. AndgrenPanu RuotsalainenJan SarénJuha UusitaloSteffen KetelhutPaul GreenleesMarkus NymanMatti LeinoJuha SorriRauno JulinBaharak HadiniaPauli PeuraSakari JuutinenAnton KhaplanovPaivi Nieminensubject
PhysicsNuclear and High Energy PhysicsAngular momentumGamma spectroscopyParity (physics)Nuclear isomerAtomic physicsNuclear ExperimentSpectroscopyGround stateElectron spectroscopyRadioactive decaydescription
The neutron-deficient nucleus $^{199}\mathrm{At}$ has been studied through $\ensuremath{\gamma}$-ray and electron spectroscopy, using the recoil-decay tagging technique. Two experiments were conducted, using a gas-filled recoil separator with a focal-plane spectrometer alone and together with a germanium-detector array at the target position. The resulting level scheme for $^{199}\mathrm{At}$ includes a new isomer with a half-life of 0.80(5) $\ensuremath{\mu}$s and a spin and parity of ($29/{2}^{+}$). The $13/{2}^{+}$ isomer, which de-excites via an $M2$ transition to the $9/{2}^{\ensuremath{-}}$ ground state, was measured to have a half-life of 70(20) ns. Our earlier version of the level scheme for $^{197}\mathrm{At}$ has been updated as well.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-10-06 | Physical Review C |