α-decay spectroscopy of the N = 130 isotones 218Ra and 220Th : mitigation of α-particle energy summing with implanted nuclei

E. Parr, J.F. Smith, P.T. Greenlees, K. Auranen, P.A. Butler, R. Chapman, D.M. Cox, D.M. Cullen, L.P. Gaffney, T. Grahn, E.T. Gregor, L. Grocutt, A. Herzáin, R.-D. Herzberg, D. Hodge, U. Jakobsson, R. Julin, S. Juutinen, J. Keatings, J. KonkiM. Leino, P.P. McKee, C. McPeake, D. Mengoni, A.K. Mistry, K.F. Mulholland, B.S. Nara Singh, G.G. O'Neill, J. Pakarinen, P. Papadakis, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, M. Scheck, C. Scholey, M. Siciliano, M. Smolen, J. Sorri, P. Spagnoletti, K.M. Spohr, S. Stolze, M.J. Taylor, J. Uusitalo

Research output: Contribution to journalArticle

43 Downloads (Pure)

Abstract

An analysis technique has been developed in order to mitigate energy summing due to sequential short-lived α decays from nuclei implanted into a silicon detector. Using this technique, α-decay spectroscopy of the N=130 isotones 218Ra (Z=88) and 220Th (Z=90) has been performed. The energies of the α particles emitted in the 218Ra→214Rn and 220Th → 216Ra ground-state-to-ground-state decays have been measured to be 8381(4) keV and 8818(13) keV, respectively. The half-lives of the ground states of 218Ra and 220Th have been measured to be 25.99(10) μs and 10.4(4) μs, respectively. The half-lives of the ground states of the α-decay daughters, 214Rn and 216Ra, have been measured to be 259(3) ns and 161(11) ns, respectively. Fine structure in the α decay of 218Ra has been observed for the first time, populating the 695-keV 2+1 state in 214Rn. The fine-structure α decay has an α -particle energy of 7715(40) keV and branching ratio bα=0.123(11)%.
Original languageEnglish
Article number044323
JournalPhysical Review C
Volume100
Issue number4
DOIs
Publication statusPublished - 30 Oct 2019

    Fingerprint

Cite this

Parr, E., Smith, J. F., Greenlees, P. T., Auranen, K., Butler, P. A., Chapman, R., Cox, D. M., Cullen, D. M., Gaffney, L. P., Grahn, T., Gregor, E. T., Grocutt, L., Herzáin, A., Herzberg, R-D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Keatings, J., ... Uusitalo, J. (2019). α-decay spectroscopy of the N = 130 isotones 218Ra and 220Th : mitigation of α-particle energy summing with implanted nuclei . Physical Review C, 100(4), [044323]. https://doi.org/10.1103/PhysRevC.100.044323