Figure 1 (IMAGE)
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Schematic figure of the experimental setup. (a) A Mo-92 beam impinges on a primary beryllium target, producing several nuclides, including Mo-86. The secondary beam then collides with a secondary beryllium target, generating excited states of Mo-86 and Mo-84. (b) The excited nuclei transition to the ground state, emitting gamma rays, which are detected by the high-purity germanium detector array GRETINA. A tantalum foil is placed behind the secondary target to reduce the velocity of in-flight ions, so that some of the gamma rays are emitted before passing through the foil, while the others are emitted afterwards. The gamma-ray spectrum requires Doppler correction because the beam is so fast, approximately 30% of the speed of light. After Doppler correction for one of the two speeds (fast/slow), the gamma-ray spectrum appears as two peaks, as shown in the figure. (Ha et al., Nature Communications)
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