Magnetic Moment and Spin of the Extremely Proton-Rich Nucleus 23Al

Abstract

The g-factor of the exteremely proton-rich nucleus 23 Al(T 1/2 = 0.47 s) has been measured for the first time, applying -NMR technique on this nucleus implanted in Si. The obtained |g| = (1.58 T 0.2) suggests that the spin of the ground state of 23 Al is 5 / 2. The magnetic moment is determined as |"| = (3.95 T 0.55) " N .

Measurement of the spin and magnetic moment ofAl23

“…The obtained g factor, |g| = 1.557 ± 0.088, clearly shows the spin and parity, J π = 5/2 + , for 23 Al, which is the same as that of its mirror partner, 23 Ne. The possible nuclear structure of 23 Al is also discussed. Studies of exotic nuclei far from the stability line have attracted much interest during the past two decades since the first observation of the neutron halo in 11 Li [1].…”

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For the first time, we obtained the g factor for the ground state of 23 Al by use of a β-NMR measurement. 23 Al has a small proton separation energy and is a potential proton-halo candidate.

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“…Recently, experimental evidence for the proton halo in very proton-rich nuclei has become available: 8 B [3][4][5], 17 Ne [6,7], and 26,27,28 P [8]. 23 Al is one of the potential candidates for a proton-halo nucleus, because its proton separation energy is quite small (125 keV). Recently, a large reaction cross section of 23 Al was measured at the intermediate energy (∼36A MeV), although the error was still large [9,10].…”

“…23 Al has a small proton separation energy and is a potential proton-halo candidate. The obtained g factor, |g| = 1.557 ± 0.088, clearly shows the spin and parity, J π = 5/2 + , for 23 Al, which is the same as that of its mirror partner, 23 Ne. The possible nuclear structure of 23 Al is also discussed.…”

“…23 Al is one of the potential candidates for a proton-halo nucleus, because its proton separation energy is quite small (125 keV). Recently, a large reaction cross section of 23 Al was measured at the intermediate energy (∼36A MeV), although the error was still large [9,10]. The authors of Ref.…”