Recoil in vacuum for Te ions: Calibration, models, and applications to radioactive-beamg-factor measurements

Abstract

In the light of new g factor results for the stable isotopes between 122 Te and 130 Te, the calibration and modeling of the recoil-in-vacuum (RIV) interaction for Te ions is reexamined, and the recent radioactive-beam g factor measurement on 132 Te by the RIV technique is reevaluated. The implications for further RIV g-factor measurements in the 132 Sn region are discussed.

Gyromagnetic ratios of excited states and nuclear structure near 132Sn

“…To date we have used a semiempirical method to define G k (|g|τ) [1,2,3,8,9]. It appears, however, that ab initio calculations of the relevant atomic physics may be possible in future [10,11].…”

“…The experimental method has been described elsewhere [1,2,3,7,8,9]. In short, beams with A ∼ 130 and energy ∼ 3 MeV/u were excited in inverse kinematics on carbon or titanium targets and then scattered out of the target into vacuum.…”

“…Anomalous magnetism, the M1 operator, and single-proton g factors Figure 1 shows the experimental [1,2,6,12,13] and theoretical [14,16,15,17] g(2 + 1 ) systematics for the Te isotopes near N = 82. There is quite good agreement between theory and experiment for 130 Te and 132 Te, however the theories do not agree for 134 Te where the experimental g factor falls between the predictions of the QRPA calculation [16] and the two shell model calculations [14,15].…”

“…Following on from the pioneering work on 132 Te [1,2], RIV g-factor measurements on the isotopes 124 Sn, 126 Sn and 128 Sn have also been published recently [3]. The measurements were performed at the Holifield Radioactive Ion Beam Facility (HRIBF).…”

Simple structures in complex nuclei versus complex structures in simple nuclei: a nuclear moments perspective

“…On the other hand 132 54 Te 80 , which has two valence protons and two neutron holes, has g ∼ Z/A [9,10]. This case will be discussed elsewhere [11].…”