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The N 28 shell closure has been investigated via the 46 Ard; p 47 Ar transfer reaction in inverse kinematics. Energies and spectroscopic factors of the neutron p 3=2 , p 1=2 , and f 5=2 states in 47 Ar were determined and compared to those of the 49 Ca isotone. We deduced a reduction of the N 28 gap by 330(90) keV and spin-orbit weakenings of ' 102 and 45(10)% for the f and p states, respectively. Such large variations for the f and p spin-orbit splittings could be accounted for by thedoi:10.1103/physrevlett.97.092501 pmid:17026356 fatcat:h4urg2j7lzhbpla2viua5ltj6e