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|Title:||Half-life measurements in 164,166Dy using γ-γ fast-timing spectroscopy with the ν-Ball spectrometer|
|Authors:||CANAVAN RHIANN; RUDIGIER MATTHIAS; REGAN P. H; LEBOIS M.; WILSON J. N.; JOVANCEVIC NIKOLA; SÖDERSTRÖM P.-A.; COLLINS S. M.; THISSE D.; BENITO J.; BOTTONI S.; BRUNET M.; CIEPLICKA-ORYNCZAK N.; COURTIN S.; DOHERTY D.T.; FRAILE L.M.; HADYNSKA-KLEK K.; HAEFNER G.; HEINE M.; ISKRA L.W.; KARAYONCHEV V.; KENNINGTON A.; KOSEOGLOU P.; LOTAY G.; LORUSSO G.; NAKHOSTIN M.; NITA C.; OBERSTEDT STEPHAN; PODOLYAK Z.; QI LIQIANG; REGIS J.-M.; SANCHEZ-TEMBLEQUE V.; SHEARMAN R.; VEDIA V.; WITT W.|
|Citation:||PHYSICAL REVIEW C vol. 101 p. 024313|
|Publisher:||AMER PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||We report on the measurement of lifetimes of excited states in the near-mid-shell nuclei 164,166Dy using the gamma-ray coincidence fast-timing method. The nuclei of interest were populated using reactions between an 18O beam and a gold-backed isotopically enriched 164Dy target of thickness 6.3 mg/cm2 at primary beam energies of 71, 76, and 80 MeV from the IPN-Orsay laboratory, France. Excited states were populated in 164Dy, 166Dy, and 178,179Wfollowing Coulomb excitation, inelastic nuclear scattering, two-neutron transfer, and fusion-evaporation reaction channels respectively. Gamma rays from excited states were measured using the ν-Ball high-purity germanium (HPGe)-LaBr3 hybrid γ -ray spectrometer with the excited state lifetimes extracted using the fast-timing coincidence method using HPGe-gated LaBr3-LaBr3 triple coincident events. The lifetime of the first Iπ = 2+ excited state in 166Dy was used to determine the transition quadrupole deformation of this neutron-rich nucleus for the first time. The experimental methodology was validated by showing consistency with previously determined excited state lifetimes in 164Dy. The half-lives of the yrast 2+ states in 164Dy and 166Dy were 2.35(6) and 2.3(2) ns, respectively, corresponding to transition quadrupole moment values of Q0 = 7.58(9) and 7.5(4) eb, respectively. The lifetime of the yrast 2+ state in 166Dy is consistent with a quenching of nuclear quadrupole deformation at β ≈ 0.35 as the N = 104 mid-shell is approached.|
|JRC Directorate:||Nuclear Safety and Security|
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