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Nuclear Excitation by Two-Photon Electron Transition.

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A new nuclear excitation mechanism, nuclear excitation via two-photon electron transitions (NETP), is proposed. This NETP mechanism shows comparable probabilities to other nuclear excitation methods, suggesting experimental feasibility.

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Area of Science:

  • Atomic physics
  • Nuclear physics
  • Quantum electrodynamics

Background:

  • Nuclear excitation typically occurs through electron transitions or electron capture.
  • Two-photon processes are fundamental in quantum electrodynamics but less explored for nuclear excitation.

Purpose of the Study:

  • To propose and theoretically investigate a novel mechanism for nuclear excitation via two-photon electron transitions (NETP).
  • To calculate the probability of NETP for a specific atomic ion and assess its experimental observability.

Main Methods:

  • Theoretical calculations of two-photon decay probabilities.
  • Focus on the E1E1 1s2s^{1}S_{0}→1s^{2}^{1}S_{0} two-photon decay of a He-like ^{225}Ac^{87+} ion.
  • Resonant excitation of a specific nuclear state at 40.09(5) keV.

Main Results:

  • The NETP mechanism is theoretically demonstrated.
  • Calculated NETP probability for ^{225}Ac^{87+} is P_{NETP}=3.5×10^{-9}.
  • This probability is comparable to established nuclear excitation mechanisms.

Conclusions:

  • The proposed NETP mechanism is a viable pathway for nuclear excitation.
  • Experimental observation of NETP is feasible and warrants further investigation.
  • This finding opens new avenues for studying nuclear properties via atomic transitions.