Using accurate dynamic polarizabilities of Li, Na, K and, Rb atoms, we scrutinize the thermal Casimir-Polder interactions of these atoms with a single layered graphene. Considering the modified Lifshitz theory for material interactions, we reanalyze the dispersion coefficients (C3s) of the above atoms with graphene as functions of separation distance, gap parameter and temperature among which some of them were earlier studied by estimating dynamic polarizabilities of the above atoms from the single oscillator model approximation. All these C3 coefficients have been evaluated in the framework of the Dirac model. The interactions are described for a wide range of distances and temperatures to demonstrate the changes in behavior with the varying conditions of the system and also sensitivities in the interactions are analyzed by calculating them for different values of the gap parameter. From these analyses, we find a suitable value of the gap parameter for which the true nature of the interactions in graphene can be surmised more accurately.
We present magic wavelengths for the nS -nP 1/2,3/2 and nS -mD 3/2,5/2 transitions, with the respective ground and first excited D states principal quantum numbers n and m, in the Mg + , Ca + , Sr + and Ba + alkaline earth ions for linearly polarized lights by plotting dynamic polarizatbilities of the nS, nP 1/2,3/2 and mD 3/2,5/2 states of the ions. These dynamic polarizabilities are evaluated by employing a relativistic all-order perturbative method and their accuracies are ratified by comparing their static values with the available high precision experimental or other theoretical results. Moreover, some of the magic wavelengths identified by us in Ca + concurs with the recent measurements reported in [Phys. Rev. Lett. 114, 223001 (2015)]. Knowledge of these magic wavelengths are propitious to carry out many proposed high precision measurements trapping the above ions in the electric fields with the corresponding frequencies.PACS numbers: 32.10 Dk,31.15.Dv, 31.15 ap State-insensitive trapping techniques have lead to tremendous advancements in the manipulation and control of atoms in far detuned optical traps. In this approach, the atoms are trapped at the wavelengths (related to frequencies) of an external electric field at which the differential light shift of an atomic transition, that is intended to be probed, due to the Stark effects nullify. These wavelengths are specially referred to as magic wavelengths (λ magic s) [1]. It has been demonstrated earlier ability of trapping neutral atoms inside high-Q cavities at λ magic s in the strong coupling regime, which is important in the quantum computation and communication schemes [2]. This technique is now widely used to carry out many high precision measurements by eliminating large systematics due to stray electric fields. Another notable application of these wavelengths is to perform clock frequency measurements [3], especially for optical frequency standards [4], that are in turn useful to probe temporal and spatial variations of the fundamental constants [5] and improving global positioning systems [6]. Knowing λ magic s of atomic systems are also very useful in the field of quantum state engineering [7], extracting out precise values of the oscillator strengths [8], etc. because of which extensive studies, both experimentally and theoretically, have been carried out in many atoms recently [6,[9][10][11][12]. On the other hand, singly charged alkaline earth ions are advantageous to carry out very high precision measurements using ion trapping and laser cooling techniques. Some of the prominent examples are the optical frequency standards [13, 14], probing variation of fundamental constants [3, 5], parity non-conservation effects [15,16] etc. Advantages of these ions owe to their metastable D states that provide longer probe times during interrogation of measurements. To reduce system- * Email: arorabindiya@gmail.com † Email: bijaya@prl.res.in atics in these measurements, state insensitive measurements can be more pertinent that will require knowledge of ...
Three consecutive Coulomb excitation experiments were performed to measure the reduced transition probabilities in 120,122,124 Te by using a 58 Ni beam. For 120 Te the collectivity was remeasured with high precision yielding a B(E2; 0 + g.s. → 2 + 1 ) value of 0.666 (20) e 2 b 2 . From the B(E2) values connecting higher-lying states, the nuclear structure of 120,122,124 Te was determined and shows a rotational behavior quite in contrast with the vibrational structure of the level schemes. The data are compared with different models.
Two consecutive Coulomb excitation experiments were performed to excite the 2 + 1 states of 112,116 Sn using a 58 Ni beam. For 112 Sn a B(E2↑) value of 0.242(8) e 2 b 2 has been determined relative to the known value of 116 Sn. The present value is more precise than previous measurements and shows a clear discrepancy from the expected parabolic dependence between the doubly magic nuclei 100 Sn and 132 Sn. It implies that the reduced transition probabilities are not symmetric with respect to the midshell mass A = 116.
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