magnetic moment

[paper] Nuclear structure of the even-even argon isotopes with a focus on magnetic moments

Nuclear structure of the even-even argon isotopes with a focus on magnetic moments

S.J.Q. Robinson et al.

10.1103/PhysRevC.79.054322″

We study the role of configuration mixing in the heavier even-even isotopes of argon. We begin by limiting the configurations of the even-even Ar isotopes to (d3/22)&pi (f7/2n)ν. There, due to the particular location in this shell-model space of 40Ar and 44Ar, we find that the spectra, B(E2)’s, and magnetic moments of these two nuclei are identical. Any deviation from this equality is direct evidence of configuration mixing. In a larger shell-model space there are significant differences between these two nuclei, with 44Ar being more collective. We also consider other even-even isotopes of argon and study how their nuclear structure effects evolve with N. We compare in the full 0ℏ ω space (sd)π (fp)ν the results of calculations with the WBT interaction and with the newer SDPF, denoted SDPF-U, interaction.

May 18, 2009 by theory 0

[paper] Charge radii and electromagnetic moments of Li and Be isotopes from the ab initio no-core shell model

Charge radii and electromagnetic moments of Li and Be isotopes from the ab initio no-core shell model

C. Forssén et al.

Recently, charge radii and ground-state electromagnetic moments of Li and Be isotopes were measured precisely. We have performed large-scale ab initio no-core shell model calculations for these isotopes using high-precision nucleon-nucleon potentials. The isotopic trends of our computed charge radii and quadrupole and magnetic-dipole moments are in good agreement with experimental results with the exception of the 11Li charge radius. The magnetic moments are in particular well described, whereas the absolute magnitudes of the quadrupole moments are about 10% too small. The small magnitude of the 6Li quadrupole moment is reproduced, and with the CD-Bonn NN potential, also its correct sign.

Feb 25, 2009 by theory 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 g factor theory 0

[paper] Correct use of the Gordon decomposition in the calculation of nucleon magnetic dipole moments

Correct use of the Gordon decomposition in the calculation of nucleon magnetic dipole moments

M. Mekhfi

doi: 10.1103/PhysRevC.78.055205

We perform the calculation of the nucleon dipole magnetic moment in full detail using the Gordon decomposition of the free quark current. This calculation has become necessary because of frequent misuse of the Gordon decomposition by some authors in computing the nucleon dipole magnetic moment.

Nov 26, 2008 by theory 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, |μexp(30Al)|=3.010(7) μN
and |μexp(32Al)|=1.959(9) μN, 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 g factor 0

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