Decay studies of neutron-deficient odd-mass At and Bi isotopes
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Authors
Kettunen, H.
Enqvist, T.
Eskola, K.
Grahn, T.
Greenlees, P. T.
Helariutta, K.
Jones, P
Julin, R.
Juutinen, S.
Kankaanpää, H.
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EDP Sciences
Abstract
Alpha-decay properties of the isotope ¹⁹¹At were investigated for the first time and the decay properties of ¹⁹³At and ¹⁹⁵At were studied with improved accuracy. The nuclei were produced in fusion-evaporation reactions of ⁵⁴Fe and ⁵⁶Fe ions with ¹⁴¹Pr and ¹⁴²Nd targets. The fusion products were separated in-flight using the gas-filled recoil separator RITU and implanted into a position-sensitive silicon detector. The isotopes were identified using position, time and energy correlations between the implants and subsequent alpha decays. New information concerning the low-lying states in the corresponding alpha-decay daughter nuclei ¹⁸⁷Bi, ¹⁸⁹Bi and ¹⁹¹Bi was also gained using alpha-gamma coincidences.
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The European Physical Journal A