Evolution of the Ar isotopic chain: the N=28 shell gap south of 48Ca

D Mengoni,T Pawłat,L Angus,S Lunardi,E Farnea,S Aydin,E Fioretto,A Goergen,G Montagnoli,L Corradi,A Algora,A Obertelli,A Gadea,S Leoni,G Benzoni,E Grodner,W Królas,B Rubio,A Gottardo,F Recchia,G Pollarolo,D Bazzacco,D Montanari,S Szilner,G De Angelis,P Mason,F Scarlassara,J Wrzesiński,R Broda,Α Dewald ,Th Pissulla ,A M Stefanini ,C A Ur ,D R Napoli ,S M Lenzi ,E Šahin ,P G Bizzeti ,J F Smith ,J J Valiente-Dobón ,P Wady ,A M Bizzeti‐Sona ,F C L Crespi

doi:10.1016/j.nuclphysa.2010.01.020

Abstract

The lifetimes of the first excited states of the Z = 18 44Ar and 46Ar isotopes have been determined using a novel technique that combines the Recoil Distance Doppler Shift method with the CLARA-PRISMA spectrometers for Multinucleon Transfer Reactions. The B(E2) values extracted for the 2 + → 0 + transitions in both nuclei, as well as for higher excites states in 44Ar, are discussed and compared with the available experimental results and with the new large-scale shell-model calculations.

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