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Prompt and delayed spectroscopy of 203At:observation of a shears band and a 29/2+ isomeric state

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Prompt and delayed spectroscopy of 203At:observation of a shears band and a 29/2+ isomeric state

http://urn.fi/urn:nbn:fi-fe202003238868
Teksti
Auranen, K. (K.) ; Uusitalo, J. (J.) ; Juutinen, S. (S.) ; Badran, H. (H.) ; Bisso, F. D. (F. Defranchi) ; Cox, D. (D.) ; Grahn, T. (T.) ; Greenlees, P. T. (P. T.) ; Herzáň, A. (A.) ; Jakobsson, U. (U.) ; Julin, R. (R.) ; Konki, J. (J.) ; Leino, M. (M.) ; Lightfoot, A. (A.) ; Mallaburn, M. J. (M. J.) ; Neuvonen, O. (O.) ; Pakarinen, J. (J.) ; Papadakis, P. (P.) ; Partanen, J. (J.) ; Rahkila, P. (P.) ; Sandzelius, M. (M.) ; Sarén, J. (J.) ; Scholey, C. (C.) ; Sorri, J. (J.) ; Stolze, S. (S.) ; Wang, Y. K. (Y. K.)
American Physical Society

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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