Author/Authors :
D Borremans، نويسنده , , S Teughels، نويسنده , , N.A. Smirnova، نويسنده , , D.L. Balabanski، نويسنده , , N Coulier، نويسنده , , J.-M Daugas، نويسنده , , F de Oliveira Santos، نويسنده , , G Georgiev، نويسنده , , M. Lewitowicz، نويسنده , , I. Matea، نويسنده , , Yu.E Penionzhkevich، نويسنده , , W.-D Schmidt-Ott، نويسنده , , Yu Sobolev، نويسنده , , M. Stanoiu، نويسنده , , K. Vyvey ، نويسنده , , G Neyens، نويسنده ,
Abstract :
The g-factor of the ground state of 31Al (T1/2=640 ms) has been measured by the β-NMR technique on a polarized secondary fragment beam at GANIL, Caen, France. The measured value of |g|=1.517(20) is compared with sd-shell model calculations, which allows the assignment of spin and parity Iπ=5/2+ to this state. The spectroscopy of neutron-rich Al isotopes on the border of the “island of inversion” is discussed in terms of the persistence of the N=20 shell closure for Z=13 nuclei.
Keywords :
Spin-polarization from projectile-fragmentation , Spin and parity , 31Al ground state g-factor , ?-NMR
