Two-photon decay of K-shell vacancy states in heavy atoms

Ilakovac, K.; Uroić, Milivoj; Majer, Marija; Pašić, Selim; Vuković, Branko

doi:10.1016/j.radphyschem.2005.07.008

Cited by 15 publications

(11 citation statements)

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“…Apart from the one-photon bound-bound transitions, the two-photon decays of metastable ionic states have also attracted much interest since the analysis of its properties may reveal unique information about the complete spectrum of the ion, including negative energy (positron) solutions of Dirac's equation. Until now, however, most two-photon studies were focused on measuring the total and energy-differential decay rates [4][5][6][7][8][9][10] which were found in good agreement with theoretical predictions, based on relativistic calculations [11][12][13][14][15][16][17][18][19][20]. In contrast, much less attention has been previously paid to the angular and polarization correlations between the emitted photons.…”

Section: Introductionmentioning

confidence: 95%

Angular correlations in the two-photon decay of heliumlike heavy ions

et al. 2010

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The two-photon decay of heavy, helium-like ions is investigated based on second-order perturbation theory and Dirac's relativistic equation. Special attention has been paid to the angular emission of the two photons (i.e., how the angular correlation function depends on the shell structure of the ions in their initial and final states). Moreover, the effects from the (electric and magnetic) nondipole terms in the expansion of the electron-photon interaction are discussed. Detailed calculations have been carried out for the two-photon decay of the 1s2s 1 S 0 , 1s2s 3 S 1 , and 1s2p 3 P 0 states of helium-like Xe 52+ , Au 77+ , and U 90+ ions.A. SURZHYKOV et al. PHYSICAL REVIEW A 81, 042510 (2010)

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Section: Introductionmentioning

confidence: 95%

Angular correlations in the two-photon decay of heliumlike heavy ions

et al. 2010

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“…Starting from the early work by Göppert-Mayer [1] and Breit and Teller [2], a large number of theoretical studies were carried out to estimate the total as well as the energy-and angle-differential (two-photon) decay rates [3][4][5][6][7][8][9][10]. When compared with experimental data [11][12][13][14][15], these studies revealed important information on relativistic, quantum electrodynamics, and many-body phenomena in atomic systems. Besides structure-related investigations, more recent interest focuses on the quantum correlations between the emitted photons, which can be used to probe fundamental aspects of modern quantum theory.…”

Section: Introductionmentioning

confidence: 99%

Quantum correlations in the two-photon decay of few-electron ions

et al. 2011

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A theoretical study of the polarization entanglement of two photons emitted in the decay of metastable ionic states is performed within the framework of density matrix theory and second-order perturbative approach. Particular attention is paid to relativistic and non-dipole effects that become important for medium- and high-$Z$ ions. To analyze these effects, the degree of entanglement is evaluated both in the dipole approximation and within the rigorous relativistic theory. Detailed calculations are performed for the two-photon $2s_{1/2}\to 1s_{1/2}$ transition in hydrogen-like, as well as for the $1s_{1/2}\, 2s_{1/2} \; {}^1S_0 \to 1s_{1/2}^2 \; {}^1S_0$, $1s_{1/2} \, 2s_{1/2} \; {}^3S_1\to 1s_{1/2}^2 \; {}^1S_0$ and $1s_{1/2} \, 2p_{1/2} \; {}^3P_0\to 1s_{1/2}^2 \; {}^1S_0$ transitions in helium-like ions

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“…This makes the two-photon decay probability to a unique observable which is sensitive to the whole structure of the investigated many-body system and allows to obtain insights beyond the properties of single states like energy and transition strengths. In atomic physics this quantity was studied extensively from the theoretical [Mok04] as well as from the experimental side [Ila06] and has indeed proven to be a valuable observable.…”

Section: Introductionmentioning

confidence: 99%

The Two-Photon Decay of the 11-/2 Isomer of 137Ba and Mixed-Symmetry States of 92,94Zr and 94Mo

Walz¹

2016

Springer Theses

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The first part of this thesis covers the two-photon decay of the 11 2 − isomer in 137 Ba. Clear evidence of this exotic decay mode is found, which opens up the possibility to use the twophoton decay probability as a general tool to investigate the structure of atomic nuclei. Details on the experiment are given, and the major challenges to successfully perform this difficult experiment are outlined. The two-photon decay experiment was conducted with the new LaBr 3 -detector ball which was setup from scratch in the framework of this thesis. The properties and performance of this powerful detector system -consisting of 18 large LaBr 3 -detectors -are discussed.Furthermore, proton scattering at 200 MeV has been performed on the nuclei 92,94 Zr, 94,96 Mo and 70 Zn. The measured cross sections are compared to calculations in the framework of the Quasi-Particle Phonon Model (QPM). Conclusions about the validity of the QPM results are drawn. A comparison of the excitation cross sections of the 2 + 1 states and the one-phonon quadrupole states with mixed neutron and proton symmetry (2 + ms ) allows to prove the special character of the 2 + ms states independently of electromagnetic transition strengths. The possible existence of 3 − and 4 + states with mixed proton and neutron symmetry is discussed. Furthermore the origin of collectivity of low-lying states in spherical nuclei is investigated in the QPM. Zusammenfassung

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Two-photon decay of K-shell vacancy states in heavy atoms

Cited by 15 publications

References 50 publications

Angular correlations in the two-photon decay of heliumlike heavy ions

Angular correlations in the two-photon decay of heliumlike heavy ions

Quantum correlations in the two-photon decay of few-electron ions

The Two-Photon Decay of the 11-/2 Isomer of 137Ba and Mixed-Symmetry States of 92,94Zr and 94Mo

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