Search results for "intruder states"

showing 2 items of 2 documents

Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes

2015

Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient Po196,198,200,202 isotopes at the REX-ISOLDE facility. A set of matrix elements, coupling the low-lying states in these isotopes, is extracted. In the two heaviest isotopes, Po200,202, the transitional and diagonal matrix elements of the 2+1 state are determined. In Po196,198 multistep Coulomb excitation is observed, populating the 4+1,0+2, and 2+2 states. The experimental results are compared to the results from the measurement of mean-square charge radii in polonium isotopes, confirming the onset of deformation from Po196 onwards. Three model descriptions are used to compare to the data. Calculati…

CHARGE RADIINuclear and High Energy PhysicsTRANSITION-PROBABILITYchemistry.chemical_elementCoulomb excitation[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]7. Clean energy01 natural sciences114 Physical sciencessymbols.namesakeMatrix (mathematics)NUCLEAR-DATA SHEETSCOULOMB-EXCITATION0103 physical sciencesSTATE PROPERTIESNuclear Physics - ExperimentNeutronfysiikka010306 general physicsEVEN-EVEN NUCLIDESMixing (physics)isotopesPoloniumINTRUDER STATESGAMMA-RAY SPECTROSCOPYPhysicsSPIN STATESisotoopitPO ISOTOPESIsotopeta114010308 nuclear & particles physicsBohr modelchemistryPhysics and AstronomysymbolsAtomic physicsInteracting boson modelphysicspolonium25.70.De 23.20.Js 25.60.−t 27.80.+w
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Experimental study of isomeric intruder ½+ states 197,203At

2017

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

astatiiniisomersintruder states
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