Nuclear moments of neon isotopes in the range fromNe17at the proton drip line to neutron-richNe25

Abstract

Nuclear moments of odd-A neon isotopes in the range 17 A 25 have been determined from optical hyperfine structures measured by collinear fast-beam laser spectroscopy. The magnetic dipole moments of 17 Ne, 23 Ne, and 25 Ne, as well as the electric quadrupole moment of 23 Ne, are either reported for the first time or improved considerably. The measurements also decide for a 1/2 + ground state of 25 Ne. The behavior of the magnetic moments of the proton drip-line nucleus 17 Ne and its mirror partner 17 N suggests isospin symmetry. Thus, no clear indication of an anomalous nuclear structure is found for 17 Ne. The magnetic moments of the investigated nuclei are discussed in a shell-model approach.

Atomic parameters for the $2{p}^{5}3p\;{}^{2}{[3/2]}_{2}-2{p}^{5}3s\;{}^{2}{[3/2]}_{2}^{o}$ transition of Ne I relevant in nuclear physics

“…In addition, the effect of the Breit interaction is remarkable in the 2p 5 3p 2 [3/2] 2 level, while tiny in the 2p 5 3s 2 [3/2] o 2 . For the magnetic dipole hyperfine interaction constants, the present results differ from previous experimental values [6,24] by less than 2% and 3% for the lower and upper levels, respectively. Furthermore, our values of the electric field gradient for 2p 5 3s 2 [3/2] o 2 is in excellent agreement with the results of Sundholm and Olsen [10] using the finite-element multiconfiguration Hartree-Fock method.…”

“…The results are displayed in Table 2 as well as other values available [24,8,10,6,25]. Among these, Q values for 21 Ne reported by Grosof et al [24] and Ducas et al [8] were obtained by fitting the measured hyperfine splittings.…”

“…Using our electric field gradient value (q = −4.681), we extracted the nuclear quadrupole moments for 21 Ne and 23 Ne, respectively, from the most recent measurements of the electric quadurpole hyperfine interaction constants [6], using the following relation Q = B 234.9647q (21) in which Q, B and q are expressed in barns, MHz and a.u., respectively. The results are displayed in Table 2 as well as other values available [24,8,10,6,25].…”

“…The magnetic dipole and the electric quadrupole moments and the charge radii of the nuclei were deduced from these measurements in combination with atomic parameters. Nevertheless, the latter were obtained either by empirical methods [8,6,9,7] or by ab initio calculations but with some approximations [10].…”

“…However, the evidence for 17 Ne was not conclusive due to conflicting theoretical and experimental results. Experiments were carried out at ISOLDE/CERN to measure hyperfine structures and isotope shifts of the transition 2p 5 3s 2 [3/2] o 2 − −2p 5 3p 2 [3/2] 2 (λ = 614.5 nm) of 17 Ne and other unstable neon isotopes up to the neutron-rich 28 Ne by using fast-beam collinear laser spectroscopy [5,6,3,7]. The magnetic dipole and the electric quadrupole moments and the charge radii of the nuclei were deduced from these measurements in combination with atomic parameters.…”