Prompt and delayed spectroscopy of 199At
Jakobsson, U., Uusitalo, J., Juutinen, S., Leino, M., Nieminen, P., Andgren, K., Cederwall, B., Greenlees, P., Hadinia, B., Jones, P., Julin, R., Ketelhut, S., Khaplanov, A., Nyman, M., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., . . . Sorri, J. (2010). Prompt and delayed spectroscopy of 199At. Physical Review C, 82(4), Article 044302. https://doi.org/10.1103/PhysRevC.82.044302
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Physical Review CDate
2010Copyright
© 2016 American Physical Society
The neutron-deficient nucleus At199 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 At199 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 the 9/2− ground state, was measured to have a half-life of 70(20) ns. Our earlier version of the level scheme for At197 has been updated as well.
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