6533b828fe1ef96bd1289216
RESEARCH PRODUCT
Experimental study of isomeric intruder ½+ states 197,203At
Kalle AuranenJuha UusitaloSakari JuutinenHussam BadranFederica Defranchi BissoDaniel CoxTuomas GrahnPaul GreenleesAndrej HerzanU. JakobssonRauno JulinJoonas KonkiMatti LeinoAlexandra LightfootM. MallaburnOlavi NeuvonenJanne PakarinenPhilippos PapadakisJari PartanenPanu RahkilaMikael SandzeliusJan SarénCatherine ScholeyJuha SorriSanna Stolzesubject
astatiiniisomersintruder statesdescription
A newly observed isomeric intruder ½ + state [ T ½ = 3.5 ( 6 ) ms ] is identified in 203 At using a gas-filled recoil separator and fusion-evaporation reactions. The isomer is depopulated through a cascade of E 3 and mixed M 1 / E 2 transitions to the 9 / 2 − ground state, and it is suggested to originate from the π ( s ½ ) − 1 configuration. In addition, the structures above the ½ + state in 203 At and 197 At are studied using in-beam γ -ray spectroscopy, recoil-decay tagging, and recoil-isomer decay tagging methods. The ½ + state is fed from 3 / 2 + and 5 / 2 + states, and the origin of these states are discussed. peerReviewed
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-01-01 |