Half-life measurement of the yrast 1^x = 2⁺ In ¹⁵²sm

Abstract

The half-life of the excited 2⁺ state at 121 keV in ¹⁵²Sm has been investigated using the fast-timing cerium-doped lanthanum-bromide (LaBr3(Ce)) scintillator detectors of the RoSPHERE gamma-ray spectrometer at IFIN- HH Bucharest. The half-life was deduced by fitting the exponential slope of the decay spectra ΔT and via the centroid shift methods. Results from both methods are in agreement with the global half-life value of 1.403(11) ns reported for the 2⁺ yrast state of ¹⁵²Sm.

Keywords: RoSPHERE, Coincidence, Gamma-ray array, Spectrometer, high-purity germanium, lanthanum tribromide scintillators, slope methods, centroid shift methods and time difference.