Resonance fluorescence with nuclei: Hg109

Transmission nuclear resonance fluorescence measurements of 238U in thick targets

“…Transmission experiments have previously neglected notch refilling because target areal densities were generally significantly smaller than in this experiment [4,9,10]. Thinner target thicknesses are better for measurement of resonant state parameters, but the target thicknesses selected for this experiment were intended to be representative of nuclear fuel assemblies.…”

“…NRF signatures are most commonly measured by either a backscatter or a transmission measurement [9,10]. In both measurement techniques, a source photon beam is used to induce nuclear excitations in a target.…”

Physical cryptographic verification of nuclear warheads

“…The widths of these absorption resonances are ∼1 eV FWHM and are described by a Dopplerbroadened Breit-Wigner formulation (13). Most of the resonances are ∼10 keV or more apart, with the energies of each resonance being unique to each isotope.…”

A novel source of tagged low-energy nuclear recoils

“…A detailed discussion of NRF can be found in [17]. The excited nucleus may decay through various allowed channels (Γ i ), but the branch (Γ 0 ) to the ground state will be the focus of this paper.…”

“…Table III gives calculated interaction rates if a pulsed γ-source producing 10 5 γ/sec with a one percent energy resolution, characteristic of the High Intensity Gamma-ray Source in high resolution mode (2.79 MHz spill frequency) [18], were incident on this detector. The rate of NRF events (Ṙ) is numerically calculated using the Doppler broadened resonance cross-section [17]. The incident flux and spill frequency of the γ-source are used to calculate ∆, the fraction of NRF events not lost due to pileup with background interactions Eq.…”