The branching ratio of 223Ac decay by spontaneous 14C emission was measured and a search for 15N clusters was performed. After exposure of a hemispherical array of solid-state nuclear track detectors, 347 14C events were identified and no 15N events. B(14C) = λ(14C)/λ(α) = (3.2 ± 1.0) x 10-11 is consistent with a favoured ground state to ground state transition. As no nitrogen tracks were found, only an upper limit could be inferred for 15N emission, B(15N) = λ(15N)/λ(α) ≤ 2.2 x 10-13 (confidence limit 90%), consistent with an unfavoured transition. Intense 227Pa sources were produced for this study, using the reaction 232Th(p,6n)227Pa. This offered an opportunity to compare the measured source strength with predictions based on published excitation function data.
Cluster emission in the radioactive decay of 223Ac / A. Guglielmetti, D. Faccio, G.F. Steyn, R. Bonetti, S.P. Tretyakova, S.V. Shishkin, A.A. Ogloblin, G.A. Pik Pichak, C. Vermeulen, N.P. van der Meulen, T.N. van der Walt, D. Mcgee - In: Proceedings of the 12. international conference on nuclear reaction mechanisms : Varenna (Italy), Villa Monastero, 15-19 June 2009. 2 / [a cura di] F. Cerutti, A. Ferrari. - Geneva : CERN, 2010. - ISBN 978-92-9083-341-3. - pp. 307-316 (( Intervento presentato al 12. convegno International conference on nuclear reaction mechanisms tenutosi a Varenna nel 2009.
Cluster emission in the radioactive decay of 223Ac
A. GuglielmettiPrimo
;R. Bonetti;
2010
Abstract
The branching ratio of 223Ac decay by spontaneous 14C emission was measured and a search for 15N clusters was performed. After exposure of a hemispherical array of solid-state nuclear track detectors, 347 14C events were identified and no 15N events. B(14C) = λ(14C)/λ(α) = (3.2 ± 1.0) x 10-11 is consistent with a favoured ground state to ground state transition. As no nitrogen tracks were found, only an upper limit could be inferred for 15N emission, B(15N) = λ(15N)/λ(α) ≤ 2.2 x 10-13 (confidence limit 90%), consistent with an unfavoured transition. Intense 227Pa sources were produced for this study, using the reaction 232Th(p,6n)227Pa. This offered an opportunity to compare the measured source strength with predictions based on published excitation function data.
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