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Prompt and delayed spectroscopy ofAt199
2010
Physical Review C
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The neutron-deficient nucleus 199 At has been studied through γ -ray and electron spectroscopy, using the recoil-decay tagging technique. Two experiments were conducted, using a gas-filled recoil separator with a focal-plane spectrometer alone and together with a germanium-detector array at the target position. The resulting level scheme for 199 At includes a new isomer with a half-life of 0.80(5) µs and a spin and parity of (29/2 + ). The 13/2 + isomer, which de-excites via an M2 transition to
doi:10.1103/physrevc.82.044302
fatcat:yjugeboz6fagnow2o7vu6qubeq