Emission of gamma rays shifted from resonant absorption by electron-nuclear double transitions in
 151
 Eu
 2+
 :CaF
 2

Olariu, Silviu; Carroll, J. J.; Collins, C. B.

doi:10.1209/epl/i1997-00130-3

Cited by 14 publications

(5 citation statements)

References 6 publications

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“…[27] As in the case of the Weisskopf estimates, the probabilities in Eqs. ( 12), (13) may differ from the real transition probabilities by about two orders of magnitude.…”

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confidence: 97%

Emission of γ rays by x-ray electron-nuclear transitions

Olariu

Zoran

1997

Phys. Rev. C

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The X-ray electron-nuclear double transitions (XENDT) are processes in which a transition effected by an inner atomic electron takes place simultaneously with a nuclear electromagnetic transition. We give expressions for the cross sections of electric and magnetic XENDTs of various multipole orders. We calculate the rate of deexcitation of isomeric nuclei induced by XENDTs for the case when the holes in the atomic shells are produced by incident ionizing electrons and find that the induced nuclear deexcitation rate becomes comparable to the natural decay rate for ionizing fluxes of the order of 10 14 W cm −2 . We show that for E1 and M1 nuclear processes for which there is a matching between the electron and the nuclear transition energies, the XENDTs can be used to produce pulses of Mössbauer radiation, with yields of the order of 10 4 Bq mA −1 .

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“…[27] As in the case of the Weisskopf estimates, the probabilities in Eqs. ( 12), (13) may differ from the real transition probabilities by about two orders of magnitude.…”

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confidence: 97%

Emission of γ rays by x-ray electron-nuclear transitions

Olariu

Zoran

1997

Phys. Rev. C

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“…The experimental results have been explained in terms of a quantum interference effect involving nuclear level anticrossing due to the presence of a combined magnetic dipole and electric quadrupole interaction. [16] in Mössbauer spectra, gamma-microwave double resonance [13,17,18], or gamma-optical double resonance [19]. Recently, interesting proposals have been discussed to obtain lasing for gamma rays by utilizing coherent effects [20][21][22][23].…”

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confidence: 99%

Controlling Absorption of Gamma Radiation via Nuclear Level Anticrossing

et al. 2002

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A significant reduction of absorption for single gamma photons has been experimentally observed by studying Mössbauer spectra of 57 Fe in a FeCO 3 crystal. The experimental results have been explained in terms of a quantum interference effect involving nuclear level anticrossing due to the presence of a combined magnetic dipole and electric quadrupole interaction. [16] in Mössbauer spectra, gamma-microwave double resonance [13,17,18], or gamma-optical double resonance [19]. Recently, interesting proposals have been discussed to obtain lasing for gamma rays by utilizing coherent effects [20][21][22][23]. In this Letter, we report on experiments demonstrating the EIT effect at the singlephoton level via the level (anti)crossing technique. A theory of the one-photon interaction with a nucleus has been developed to describe the experimental results. The obtained results open an interesting perspective to extend coherent effects to nuclear transitions. Figure 1 represents the main results of the paper. It shows the observed Mössbauer spectrum of a single crystal of FeCO 3 at a temperature of 30.5(5) K which corresponds to a magnetic hyperfine field of B 15:1 3 T. At this field the hyperfine levels jm 1=2i and jm ÿ3=2i anticross. For the transitions connected to the anticrossing levels, a deficit of absorption of 25% is observed at the peak velocity. It means that some transparency is induced by interference, similar to EIT observed in optics.The experiments were performed by using a conventional Mössbauer setup. It includes a source of gamma radiation ( 57 CoRh), an absorber of FeCO 3 cleaved on the f1014g faces (optical thickness is of the order 10), and a detector. The absorber was mounted on a target holder which allows for a precise temperature control at the target position in the interval 4-600 K. Besides the magnetic hyperfine field, the Fe 2 nucleus in the FeCO 3 crystal [24,25] is subjected to a large axially symmetric electric field gradient (EFG) which results in a well-resolved quadrupole doublet. The level structures of the source and the absorber are shown in Fig. 2. In a magnetic field, the levels might shift to the position where their energies coincide; this situation is referred to as level crossing. But due to the presence of additional fields, the energies of levels might never be equal, and it is the case of level anticrossing.If the magnetic field is collinear with the EFG axis, the axial symmetry is preserved and the m states are eigenfunctions of the total nuclear Hamiltonian if the z axis is chosen along the symmetry axis. However, in such a mineral containing impurities and defects, one can expect a small distribution of fields which are responsible for the

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“…[18]). Here we will consider Figure 13 Four-level energy level scheme of the compound nuclear-electron system [20].…”

Section: Second Model Of An Electron-nuclear System: Modification Of mentioning

confidence: 99%

“…Soon afterwards, this concept of LWI was tried to be utilized in the nuclear domain [16][17][18][19][20][21][22]. Here it should also be mentioned that a concept of a gamma laser has been considered, which makes use of the cinematic shift and splitting of spectral lines of gamma transitions observed in an ensemble of free nuclei owing to recoil [23].…”

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confidence: 99%

Towards more relaxed conditions for a gamma‐ray laser: Methods to realize induced transparency for nuclear resonant gamma radiation

Odeurs¹,

Hoy

Rostovtsev

et al. 2010

Laser & Photonics Reviews

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Nuclear quantum optics deals with the resonant interaction of gamma-radiation and nuclei, generally incorporated in a solid-state material. Single gamma-rays interact with an ensemble of nuclei. The properties of the resonantly forward-scattered gamma-radiation depend on the details of the interaction. An external modification of the nuclear energies will influence the interactions, and hence the properties of the radiation. Several techniques are proposed to reduce the resonant absorption of the gamma-rays, creating a nuclear medium that is partially transparent: nuclear-level-mixing induced transparency, modification of nuclear levels by means of an optical laser, phase-shift-induced transparency. Interference is crucial in all this. The partial transparency could be exploited to study special effects such as slow gamma-radiation and gain without population inversion. It could also be of importance for the realization of a gamma-ray laser.Less than expected absorption of gamma rays at nuclear level crossing (red arrow).

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Emission of gamma rays shifted from resonant absorption by electron-nuclear double transitions in ¹⁵¹ Eu ²⁺ :CaF ₂

Cited by 14 publications

References 6 publications

Emission of γ rays by x-ray electron-nuclear transitions

Emission of γ rays by x-ray electron-nuclear transitions

Controlling Absorption of Gamma Radiation via Nuclear Level Anticrossing

Towards more relaxed conditions for a gamma‐ray laser: Methods to realize induced transparency for nuclear resonant gamma radiation

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Emission of gamma rays shifted from resonant absorption by electron-nuclear double transitions in 151 Eu 2+ :CaF 2

Cited by 14 publications

References 6 publications

Emission of γ rays by x-ray electron-nuclear transitions

Emission of γ rays by x-ray electron-nuclear transitions

Controlling Absorption of Gamma Radiation via Nuclear Level Anticrossing

Towards more relaxed conditions for a gamma‐ray laser: Methods to realize induced transparency for nuclear resonant gamma radiation

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Product

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Emission of gamma rays shifted from resonant absorption by electron-nuclear double transitions in ¹⁵¹ Eu ²⁺ :CaF ₂