Measurement of the magnetic moments of

Abstract

The isomeric state of 73 As (426 keV, 5.8 jusec) was produced and aligned by the reaction 71 Ga (a,2n) in a liquid metal target. The anisotropics of the depopulating y-rays were measured vs. the dc magnetic field applied perpendicular to the beam-detector plane. From the attenuation and rotation, we obtain g= +1.03 ± 0.11. Limits of <5 2 < 10-2 can be set to the multipole admixtures in both ^-transitions. The same technique was applied to the 123 /usee isomer of 206 Pb (2200 keV) produced by 204 Hg (a,2n). After estimating the relaxation time, g =-(0.035 + 0.020) is obtained.

Theoretical evaluation of the7,9Be 2s2p24P1/2,3/2,5/2hyperfine structure parameters and Be 2s2p3Poelectron affinity

“…The magnetic moment has been estimated recently by comparing HFSs of 2s 2 S 1/2 -2p 2 P o 1/2 for 7 Be + and 9 Be + , as obtained from collinear fast-beam laser spectroscopy with optical detection. The preliminary value reported in [6] is µ = −1.398 (15) µ N . The quadrupole moment of this isotope has been estimated to be −0.060 Q( 7 Be) −0.069b [1] from a set of parameters that reproduce simultaneously the most important properties of 7 Be, 7 Li and 8 B.…”

“…Atomic spectroscopy experiments can now be performed on unstable Be isotopes thanks to the ISOLDE facility at CERN [4]. In [4] isotope shift and hyperfine structure (HFS) measurements are announced for 7,9,10 Be II [5] and a preliminary value of the nuclear magnetic dipole moments of 7 Be has been reported in this context in [6].…”

“…In this latter reference, isotope shift and hyperfine structure measurements are announced [5] for 7,9,10 Be II and a preliminary value of the nuclear magnetic dipole moments of 7 Be has been reported in this context [6].…”