Author:
Pellumaj J.,Gottardo A.,Goasduff A.,Bazzacco D.,Brugnara D.,Bottoni S.,Capra S.,de Angelis G.,Gozzelino A.,Ha J.,Lenzi S.M.,Marchi T.,Menegazzo R.,Mengoni D.,Nannini A.,Napoli D.R.,Pérez-Vidal R.M.,Pigliapoco S.,Recchia F.,Rezynkina K.,Valiente-Dobón J.J.,Zanon I.,Ziliani S.,Zhang G.,Carturan S.,Loriggiola M.
Abstract
Abstract
Quadrupole interaction involving protons and neutrons drives the nucleus into deformed configurations at low excitation energies. Intruder states appear in N=49 isotones, reaching a minimum at around 500 keV in 83Se. Since 83Se is in the mid of the proton shell (Z=28-40), it is a good candidate to study the properties of particle-hole intruder states lowered in energy by large quadrupole correlations. Moreover, it will also allow one to estimate the degree of N=50 core breaking in the ground state of Se isotopes. The lifetime of the 540-keV 1/2+ state and 1100-keV 3/2+ state of 83Se were measured using the Recoil Distance Method and the Doppler Shift Attenuation Method respectively. A beam of 82Se, with intensity 0.02 pnA, accelerated to 270 MeV from the Tandem accelerator at LNL-INFN, was sent into a deuterated polyethylene foil (C2D4), evaporated on a 6 mg/cm2 gold layer. The GALILEO γ-array was coupled to the SPIDER silicon array, allowing one to obtain the needed channel selectivity through particle-γ coincidence measurements.
Subject
Computer Science Applications,History,Education