Spectroscopy of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Ac</mi><mprescripts></mprescripts><none></none><mn>209</mn></mmultiscripts></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Ac</mi><mprescripts></mprescripts><none></none><mn>207</mn></mmultiscripts></math>

H. Kokkonen; K. Auranen; P.-A. Aden; J. Ahokas; N. Alwadie; V. Bogdanoff; A. D. Briscoe; J. Chadderton; T. Grahn; P. T. Greenlees; B. J. M. Hogg; A. Herzáň; H. Joukainen; R. Julin; H. Jutila; J. Khuyagbaatar; W. N. Landsman; D. Lazzaretto; M. Leino; J. Louko; A. McCarter; D. O'Donnell; J. Ojala; R. D. Page; J. Pakarinen; P. Rahkila; P. Ruotsalainen; J. Sarén; E. Uusikylä; J. Uusitalo; D. White

doi:10.1103/yt44-ky4x

Spectroscopy of ${}^{209}{Ac}$ and ${}^{207}{Ac}$

H. Kokkonen ^1,*, K. Auranen ^1,†, P.-A. Aden ¹, J. Ahokas ¹, N. Alwadie^2,3, V. Bogdanoff¹, A. D. Briscoe³, J. Chadderton ³, T. Grahn ¹ et al.

P. T. Greenlees ¹, B. J. M. Hogg ⁴, A. Herzáň ⁵, H. Joukainen ^1,‡, R. Julin ¹, H. Jutila ¹, J. Khuyagbaatar⁶, W. N. Landsman¹, D. Lazzaretto ¹, M. Leino ¹, J. Louko ¹, A. McCarter ^3,§, D. O'Donnell ⁴, J. Ojala ¹, R. D. Page ³, J. Pakarinen¹, P. Rahkila ¹, P. Ruotsalainen ¹, J. Sarén ¹, E. Uusikylä¹, J. Uusitalo^1,3, and D. White ⁴

¹Accelerator Laboratory, Department of Physics, University of Jyväskylä, FI-40014 Jyväskylä, Finland
²Department of Physics, College of Science, King Khalid University, Abha 61421, Saudi Arabia
³University of Liverpool, Department of Physics, Oliver Lodge Laboratory, Liverpool L69 7ZE, United Kingdom
⁴School of Computing, Engineering, and Physics Sciences, University of the West of Scotland, Paisley PA1 2BE, United Kingdom
⁵Institute of Physics, Slovak Academy of Sciences, Bratislava 84511, Slovakia
⁶GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany

^*Contact author: henna.e.kokkonen@jyu.fi
^†Contact author: kalle.e.k.auranen@jyu.fi
^‡Present address: Department of Physics, Chalmers University of Technology, Göteborg 412 96, Sweden.
^§Present address: Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, Groningen 9747 AA, The Netherlands.

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Phys. Rev. C 113, 044309 – Published 13 April, 2026

DOI: https://doi.org/10.1103/yt44-ky4x

Abstract

Excited states of ${}^{209}{Ac}$ and ${}^{207}{Ac}$ were observed, for the first time, by employing a highly selective recoil-decay tagging method and the recoil ion transport unit (RITU) gas-filled recoil separator. The nuclei were produced in the ${}^{180}{Hf} ({}^{35}{Cl}, 6 n) {}^{209}{Ac}$ and ${}^{175}{Lu} ({}^{36}{Ar}, 4 n) {}^{207}{Ac}$ fusion-evaporation reactions. The ${}^{209}{Ac}$ isotope was studied using in-beam spectroscopy. Prompt $γ$ rays were observed by the JUROGAM3 Ge-detector array and a level scheme was deduced. The ${}^{207}{Ac}$ isotope was probed at the focal plane spectrometer of the separator and a $13 / 2^{+}$ ( $π i_{13 / 2}$ ) isomeric state was observed for the first time in any $N \leq 126$ actinium isotope.

Physical Review C

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Spectroscopy of ${}^{209}{Ac}$ and ${}^{207}{Ac}$

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Spectroscopy of Ac209 and Ac207

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Spectroscopy of ${}^{209}{Ac}$ and ${}^{207}{Ac}$