Title: Half-life measurements in 164,166Dy using γ-γ fast-timing spectroscopy with the ν-Ball spectrometer
Authors: CANAVAN RHIANNRUDIGIER MATTHIASREGAN P. HLEBOIS M.WILSON J. N.JOVANCEVIC NIKOLASÖDERSTRÖM 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 STEPHANPODOLYAK Z.QI LIQIANGREGIS J.-M.SANCHEZ-TEMBLEQUE V.SHEARMAN R.VEDIA V.WITT W.
Citation: PHYSICAL REVIEW C vol. 101 p. 024313
Publisher: AMER PHYSICAL SOC
Publication Year: 2020
JRC N°: JRC120466
ISSN: 2469-9985 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC120466
DOI: 10.1103/PhysRevC.101.024313
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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