Electromagnetic moments of neutron-rich nuclei measured with polarized radioactive ion beams

Shell-model calculations for neutron-rich carbon isotopes with a chiral nucleon-nucleon potential

“…2 are the only observed bound states. We see that the theory 10 [15], ±1.758 ± 0.030 nm [16], and ±0.758 ± 0.004 nm [17], respectively.…”

“…1, it can be seen that our calculations underestimate the experimental data. It is worth noting that this discrepancy may be "healed" by downshifting the single-particle spectrum so as to reproduce the experimental ground-state energy of 15 C relative to 14 C. The results obtained with this downshift (−427 keV) are reported in Fig. 1 by the black dashed line.…”

“…2 are the only observed bound states. We see that the theory provides a satisfactory description of these states, apart from the inversion between the J π = 5 n.m., to be compared with the experimental values ±1.720 ± 0.009 [15] n.m., ±1.758 ± 0.030 n.m. [16], and ±0.758 ± 0.004 n.m. [17], respectively. In Tables III we report the effective reduced singleneutron matrix elements of the M 1 operator.…”

“…In this work, however, we have adopted a different approach employing single-particle energies obtained from the Ŝ-box calculation. In this connection, it is worth noting that the observed lowest J π = 1 2 + , 5 2 + , 3 2 + states in 15 C are not pure single-particle states [13]. In Table I our calculated single-particle energies are reported.…”

Electromagnetic form factors of one neutron halos with spin 1/2+ ground state

“…Experimentally only the magnitude of the magnetic moment is known as κ (exp) φ = (1.720 ± 0.009) [33]. Assuming a shell-model configuration with a valence s-wave neutron dominating the 15 C ground state wave function with 97-98% probability, a tentative experimental value κ (exp) φ = −(1.77 ± 0.05) [33] was extracted. From this we can extract L M = −2.0.…”