Title: Multi-quasiparticle sub-nanosecond isomers in 178W
Authors: RUDIGIER MATTHIASWALKER P.M.CANAVAN RHIANNPODOLYAK Z.REGAN P. HSÖDERSTRÖM P.-A.LEBOIS M.WILSON J. N.JOVANCEVIC NIKOLABLAZHEV A.BENITO J.BOTTONI S.BRUNET M.CIEPLICKA-ORYNCZAK N.COURTIN S.DOHERTY D.T.FRAILE L.M.HADYNSKA-KLEK K.HEINE M.ISKRA L.W.JOLIE J.KARAYONCHEV V.KENNINGTON A.KOSEOGLOU P.LOTAY G.LORUSSO G.NAKHOSTIN M.NITA C.OBERSTEDT STEPHANQI LIQIANGRÉGIS J.-M.SÁNCHEZ-TEMBLEQUE V.SHEARMAN R.WITT W.VEDIA V.ZELL K.O.
Citation: PHYSICS LETTERS B vol. 801 p. 135140
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2020
JRC N°: JRC117359
ISSN: 0370-2693 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC117359
DOI: 10.1016/j.physletb.2019.135140
Type: Articles in periodicals and books
Abstract: We report on the first measurement of the half-lives of K(pi) = 11- and 12+ four-quasiparticle states in the even-even nucleus W-178. The sub-nanosecond half-lives were measured by applying the centroid shift method to data taken with LaBr3 scintillator detectors of the NuBall array at the ALTO facility in Orsay, France. The half-lives of these states only became accessible by the combination of several experimental techniques - scintillator fast timing, isomer spectroscopy with a pulsed beam, and the event-by-event calorimetry information provided by the NuBall array as a whole. The measured half-lives are 476(44)ps and 275(65)ps for the I(pi) = 11- and 12+, respectively. The decay transitions include weakly hindered E1 and E2 branches directly to the ground-state band, bypassing the two-quasiparticle states. This is the first such observation for an E1 transition. The interpretation of the small hindrance hinges on mixing between the ground-state band and the t-band.
JRC Directorate:Nuclear Safety and Security

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