g factor

[paper] Magnetic dipole moments of ^57,58,59Cu

Magnetic dipole moments of ^57,58,59Cu

T.E. Cocolios et al.

In-gas-cell laser spectroscopy of the isotopes ^{57,58,59,63,65}Cu has been performed at the LISOL facility using the 244.164-nm optical transition from the atomic ground state of copper. A detailed discussion on the hyperfine structure of ⁶³Cu is presented. The magnetic dipole moments of the isotopes ^57,58,59,65Cu are extracted based on that of ⁶³Cu. The new value μ=+0.479(13)μ_N is proposed for ⁵⁸Cu, consistent with that of a πp_3/2⊗νp_3/2 ground-state configuration. Spin assignments for the radioactive isotopes ^57,58,59Cu are confirmed. The isotope shifts between the different isotopes are also given and discussed.

Jan 28, 2010 by Theo g factor 0

[paper] g factors of first 2⁺ states of neutron-rich Xe, Ba, and Ce isotopes

g factors of first 2⁺ states of neutron-rich Xe, Ba, and Ce isotopes

C. Goodin et al.

10.1103/PhysRevC.79.034316

Using new techniques developed for measuring angular correlations with large detector arrays, the g factors of 2⁺ states in ^140,142Xe are measured for the first time by the method of correlation attenuation in randomly oriented magnetic fields. g factors in ¹⁴⁶Ba and ^146,148Ce are measured to establish the method by comparison with previous values. The results are discussed in terms of IBM-2 and rotation-vibration models.

Mar 26, 2009 by Theo experiment g factor 0

[paper] Quantum Monte Carlo calculations of magnetic moments and M1 transitions in A≤7 nuclei including meson-exchange currents

Quantum Monte Carlo calculations of magnetic moments and M1 transitions in A≤7 nuclei including meson-exchange currents

L.E. Marcucci et al.

doi: 10.1103/PhysRevC.78.065501

Green’s function Monte Carlo calculations of magnetic moments and M1 transitions including two-body meson-exchange current (MEC) contributions are reported for A≤7 nuclei. The realistic Argonne v₁₈ two-nucleon and Illinois-2 three-nucleon potentials are used to generate the nuclear wave functions. The two-body meson-exchange operators are constructed to satisfy the continuity equation with the Argonne v₁₈ potential. The MEC contributions increase the A=3,7 isovector magnetic moments by 16% and the A=6,7 M1 transition rates by 17–34%, bringing them into very good agreement with the experimental data.

Dec 10, 2008 by Theo g factor theory 0

[paper] Quadrupole moments of some nuclei around the mass of A∼80: ^{76,78,80,82,84}Kr and neighboring Se isotope

Quadrupole moments of some nuclei around the mass of A∼80: ^{76,78,80,82,84}Kr and neighboring Se isotope

N. Turkan et al.

doi: 10.1134/S1063778809060088

The quadrupole moments of ^{76,78,80,82,84,88}Kr and ^{74,76,78,80,82}Se isotopes are investigated in terms of the interacting boson model (IBM), and it was found that a good description of them can also be concluded in this model. Before the quadrupole moments were calculated, the positive-parity states and electromagnetic-transition rates (B(E2)) of even-mass Kr nuclei have also been obtained within the framework of IBM. It was seen that there is a good agreement between the presented results and the previous experimental data. The quadrupole moments of the neighboring Se isotopes were also obtained and it was seen that the results are satisfactorily agree well with the previous experimental data.

Apr 14, 2008 by Theo g factor 0

[paper] g factor of the exotic N=21 isotope ³⁴Al: probing the N=20 and N=28 shell gaps at the border of the "island of inversion"

g factor of the exotic N=21 isotope ³⁴Al: probing the N=20 and N=28 shell gaps at the border of the "island of inversion"

P. Himpe et al.

doi: 10.1016/j.physletb.2007.11.017

For the first time the g factor of an isotope beyond N=20 near the "island of inversion" has been measured. A ³⁴Al radioactive beam was produced in a one-neutron pickup reaction on a ³⁶S primary beam at 77.5 MeV/u, providing a large spin-polarization for application of the β-Nuclear Magnetic Resonance (β-NMR) method. The measured g factor of ³⁴Al, |g|=0.539(2), combined with results from earlier β-decay studies, allows to firmly assign a ground state spin/parity 4⁻. Comparison to large scale shell model calculations reveals that a dominant amount of intruder components is needed in the ³⁴Al wave function to account for the observed large magnetic moment μ=(+)2.156(16)μ_N. This reveals Z=13 to be a true "transition number" between the normal Z=14 Si isotopes and the abnormal Z=12 Mg isotopes. The sensitivity of this odd–odd ground state dipole moment to the N=20, as well as the N=28 gap, reveals that both are significantly reduced, despite Z=13 being outside the conventional island of inversion.

Jan 10, 2008 by Theo experiment g factor 0

[paper] Magnetic moments of ³⁰₁₃Al₁₇ and ³²₁₃Al₁₉

Magnetic moments of ³⁰₁₃Al₁₇ and ³²₁₃Al₁₉

H. Ueno et al.

doi: 10.1016/j.physletb.2005.04.037

Ground-state magnetic moments of ³⁰Al and ³²Al were measured
with the β-NMR method using radioactive-isotope beams spin-polarized in the projectile-fragmentation
reaction. Polarization of sizes |P|=0.5–1% were obtained in spite of the large numbers of nucleons
that are removed from the projectile ⁴⁰Ar, providing a promising prospect that
substantial polarizations are obtained even in fragment nuclei that are far removed from the projectile nucleus.
The obtained μ moments, |μ_exp(³⁰Al)|=3.010(7) μ_N
and |μ_exp(³²Al)|=1.959(9) μ_N, are in agreement with
shell model calculations within the sd valence space, although a reduction in the energy-gap between
the sd and pf states is predicted for ³²Al in recent theoretical studies.

Jun 2, 2005 by Theo g factor 0

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