Nuclear excitation by electronic transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>189</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Os</mml:mi></mml:math>

Ahmad, I.; Dunford, R. W.; Esbensen, H.; Gemmell, D. S.; Kanter, E. P.; Rütt, U.; Southworth, S. H.

doi:10.1103/physrevc.61.051304

Cited by 43 publications

(20 citation statements)

References 17 publications

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“…The most recent and reliable experimental results on NEET have been performed on 197 Au [4,19], 189 Os [20,21] and 235 U [22]. The NEET probability for the 77.351 keV 197 Au nuclear transition that corresponds to an atomic K → M transition in neutral atoms was determined to be (5.0 ± 0.6) × 10 −8 [4].…”

Section: Introductionmentioning

confidence: 99%

Overlapping resonances in nuclei coupling to the atomic shells

Arigapudi

Pálffy

2012

Phys. Rev. A

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The resonant process of nuclear excitation by electron transition (NEET) in highly charged ions is investigated. In NEET, a bound electronic decay transition occurs with the simultaneous excitation of the nucleus, provided that the energies of the atomic and nuclear transition match. By varying the atomic charge state, the atomic transition energy can be tuned to a better match of the nuclear transition energy. We propose a new way to create the atomic hole in highly charged ions by dielectronic capture of a free electron. In order to derive the cross section for the three-step process composed by dielectronic capture, nuclear excitation by electron transition, and the subsequent nuclear decay, a Feshbach projection operator formalism is developed. With the help of this formalism, the resonances in nuclei coupling to the atomic shell and the possible interference between several direct and resonant electronic and nuclear processes such as radiative recombination, dielectronic recombination and nuclear excitation by electron capture are described.

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Section: Introductionmentioning

confidence: 99%

Overlapping resonances in nuclei coupling to the atomic shells

Arigapudi

Pálffy

2012

Phys. Rev. A

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“…2) for the coefficients, a α and a β , can be solved analytically [7] and this leads to an exact, if somewhat complex, expression for P NEET (=P β ). For small κ, this expression reduces to…”

Section: Neetmentioning

confidence: 99%

“…The Following the derivation of Ref. [7], the theoretical expression for the electromagnetic (M1 or E2) coupling matrix element is…”

Section: Neetmentioning

confidence: 99%

“…The solution [1,7,8,20] was to perform the experiments using an intense monochromatic x-ray beam with an energy just above the ionization energy needed to create the initial atomic vacancies, but with the energy carefully chosen not to coincide with excited nuclear states (due attention also being given to the energies of harmonics of the fundamental beam energy).…”

Section: Neetmentioning

confidence: 99%

“…At the APS we have looked for NEET in 189 Os [7,8] and have attempted to verify the x-ray triggering of the decay of 178 m2 Hf [6]. At SPring-8, Kishimoto et al [1] have observed NEET in 197 Au, and other experimenters [4] have reported the observation of triggering in 178 m2 Hf.…”

Section: Introductionmentioning

confidence: 99%

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Nuclear Transitions Induced by Synchrotron X-rays

Gemmell¹

2003

AIP Conference Proceedings

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Abstract. We discuss two rare but interesting processes by which synchrotron x-rays with energies up to about 100 keV may be used to induce nuclear transitions.In the NEET (Nuclear Excitation by Electronic Transition) process, an intense x-ray beam is employed to make vacancies, e.g. K-holes, in the atoms of a specific nuclear isotope. When a vacancy is filled by an electronic transition from a higher atomic level, there is some probability that instead of the usual x-ray or Auger emission, the nucleus of the atom itself will be excited. This is then followed by a nuclear decay exhibiting characteristic gamma-rays or other types of radiation, with time delays typical of the nuclear states involved. The probability for NEET increases when the energies of the atomic and the nuclear transitions become close. We address some theoretical aspects of the process and describe experimental efforts to observe it in 189 Os and 197 Au.The second process to be discussed is the possibility of "triggering" the decay of a nuclear isomer by irradiation with an x-ray beam. We focus on the case of the 31-year, 2.4-MeV, 16+ isomer of 178 Hf. There has been speculation that if one could isolate gram quantities, say, of this isomer and then have the capability to accelerate its decay in a controlled way, one would have a powerful triggerable source of enormous energy. This could be used to generate explosions, for rapid irradiations, or for more general energy-storage applications, depending on the rate of energy release. We describe attempts to observe this process.

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