Prompt and delayed spectroscopy of ²⁰³At : observation of a shears band and a 29/2+ isomeric state
Auranen, K.; Uusitalo, J.; Juutinen, S.; Badran, H.; Bisso, F. Defranchi; Cox, D.; Grahn, T.; Greenlees, P. T.; Herzáň, A.; Jakobsson, U.; Julin, R.; Konki, J.; Leino, M.; Lightfoot, A.; Mallaburn, M. J.; Neuvonen, O.; Pakarinen, J.; Papadakis, P.; Partanen, J.; Rahkila, P.; Sandzelius, M.; Sarén, J.; Scholey, C.; Sorri, J.; Stolze, S.; Wang, Y. K. (2017-12-22)
K. Auranen et al. Prompt and delayed spectroscopy of 203At: Observation of a shears band and a 29/2+ isomeric state. Phys. Rev. C 97, 024301. https://doi.org/10.1103/PhysRevC.97.024301
© 2018 American Physical Society.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe202003238868
Tiivistelmä
Abstract
Using fusion-evaporation reactions, a gas-filled recoil separator, recoil-gating technique and recoil-isomer decay tagging technique we have extended the level scheme of ²⁰³At (N = 118) significantly. We have observed an isomeric [τ=14.1(3)μs] state with a spin and parity of 29/2+. The isomeric state is suggested to originate from the π(h9/2)⊗∣∣²⁰²Po;11⁻⟩ coupling, and it is depopulated through 286 keV E2 and 366 keV E3 transitions. In addition, we have observed a cascade of magnetic-dipole transitions which is suggested to be generated by the shears mechanism.
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