Spectroscopy of 209Ac and 207Ac
Journal article, 2026
Excited states of 209Ac and 207Ac 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 180Hf(35Cl, 6n) 209Ac and 175Lu(36Ar, 4n) 207Ac fusion-evaporation reactions. The 209Ac isotope was studied using in-beam spectroscopy. Prompt gamma rays were observed by the JUROGAM3 Ge-detector array and a level scheme was deduced. The 207Ac isotope was probed at the focal plane spectrometer of the separator and a 13/2+ (pi i13/2) isomeric state was observed for the first time in any N 126 actinium isotope.
Author
H. Kokkonen
University of Jyväskylä
K. Auranen
University of Jyväskylä
P. A. Aden
University of Jyväskylä
J. Ahokas
University of Jyväskylä
N. Alwadie
King Khalid Univ
University of Liverpool
V. Bogdanoff
University of Jyväskylä
A. D. Briscoe
University of Liverpool
J. Chadderton
University of Liverpool
T. Grahn
University of Jyväskylä
P. T. Greenlees
University of Jyväskylä
B. J. M. Hogg
University of the West of Scotland
A. Herzan
Slovak Academy of Sciences
Henna Joukainen
Subatomic, High Energy and Plasma Physics 1
R. Julin
University of Jyväskylä
H. Jutila
University of Jyväskylä
J. Khuyagbaatar
Helmholtz Association of German Research Centres
W. N. Landsman
University of Jyväskylä
D. Lazzaretto
University of Jyväskylä
M. Leino
University of Jyväskylä
J. Louko
University of Jyväskylä
A. McCarter
University of Groningen
University of Liverpool
D. O'Donnell
University of the West of Scotland
J. Ojala
University of Jyväskylä
R. D. Page
University of Liverpool
J. Pakarinen
University of Jyväskylä
P. Rahkila
University of Jyväskylä
P. Ruotsalainen
University of Jyväskylä
J. Saren
University of Jyväskylä
E. Uusikyla
University of Jyväskylä
J. Uusitalo
University of Liverpool
University of Jyväskylä
D. White
University of the West of Scotland
PHYSICAL REVIEW C
2469-9985 (ISSN) 2469-9993 (eISSN)
Vol. 113 4 044309Subject Categories (SSIF 2025)
Subatomic Physics
DOI
10.1103/yt44-ky4x