Author:

Keywords:

Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Nuclear, Physics, Particles & Fields, Physics, beta-NMR/NQR, g factor, Quadrupole moment, Al-34m, QUADRUPOLE-MOMENTS, MAGNETIC-MOMENTS, SHELL, COLLECTIVITY, DEFORMATION, SPIN, ELECTRIC QUADRUPOLE-MOMENT, SHELL CLOSURE, GROUND-STATE, INELASTIC-SCATTERING, STABILITY, 0105 Mathematical Physics, 0201 Astronomical and Space Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 49 Mathematical sciences, 51 Physical sciences

Abstract:

© 2018 The Author(s) The nuclear g factor and quadrupole moment (Q s ) have been measured for the low-lying isomeric 1 + state of 34 Al, using the β-detected nuclear magnetic resonance (β-NMR) and quadrupole resonance (β-NQR) methods. Spin-polarized 34 Al isotopes were produced in a one-neutron pickup reaction induced by a 36 S beam on a 9 Be target at a kinetic energy of 77.5 MeV/nucleon, and were collected with the LISE fragment separator at GANIL. The measured g factor (|g| in a range of 1.757±0.014) and quadrupole moment (|Q s |=38(5) mb) are in good agreement with shell-model calculations using effective interactions. The similarity between the g factor of 34m Al and that of 32 Al confirms a dominant neutron 2p1h configuration π(d 5/2 ) −1 ⊗ν(d 3/2 ) −1 (f 7/2 ) 2 of 34m Al. In addition, the enhanced quadrupole moment of 34m Al relative to that of 32 Al suggests that the neutron 1p1h excitation across the N=20 shell gap introduces extra nucleon–nucleon correlation and deformation.