Spectroscopy of 209Ac and 207Ac

H. Kokkonen; K. Auranen; P.-A. Aden; A. 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 ²⁰⁹Ac and ²⁰⁷Ac

H. Kokkonen^*
, K. Auranen
, P.-A. Aden
, A. 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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

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 , 6⁢𝑛) ²⁰⁹Ac and ¹⁷⁵Lu ⁢(³⁶Ar ,4⁢𝑛)⁢ ²⁰⁷Ac
fusion-evaporation reactions. The ²⁰⁹Ac 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 ²⁰⁷Ac 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≤126 actinium isotope.

Original language	English
Article number	044309
Number of pages	9
Journal	Physical Review C
Volume	113
DOIs	https://doi.org/10.1103/yt44-ky4x
Publication status	Published - 13 Apr 2026

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2026 03 13 Kokkonen et al Spectroscopy acceptedAccepted author manuscript, 1.13 MB

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Kokkonen, H., Auranen, K., Aden, P.-A., Ahokas, A., Alwadie, N., Bogdanoff, V., Briscoe, A. D., Chadderton, J., Grahn, T., Greenlees, P. T., Hogg, B. J. M., Herzáň, A., Joukainen, H., Julin, R., Jutila, H., Khuyagbaatar, J., Landsman, W. N., Lazzaretto, D., Leino, M., ... White, D. (2026). Spectroscopy of ²⁰⁹Ac and ²⁰⁷Ac. Physical Review C, 113, Article 044309. https://doi.org/10.1103/yt44-ky4x

@article{b4a6d83d173a436dbeca4593d043cf3a,

title = "Spectroscopy of 209Ac and 207Ac",

abstract = "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 , 6⁢𝑛) 209Ac and 175Lu ⁢(36Ar ,4⁢𝑛)⁢ 207Ac fusion-evaporation reactions. The 209Ac 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 207Ac isotope was probed at the focal plane spectrometer of the separator and a 13/2+ (𝜋⁢𝑖13/2) isomeric state was observed for the first time in any 𝑁≤126 actinium isotope.",

author = "H. Kokkonen and K. Auranen and P.-A. Aden and A. Ahokas and N. Alwadie and V. Bogdanoff and Briscoe, \{A. D.\} and J. Chadderton and T. Grahn and Greenlees, \{P. T.\} and Hogg, \{B. J. M.\} and A. Herz{\'a}{\v n} and H. Joukainen and R. Julin and H. Jutila and J. Khuyagbaatar and Landsman, \{W. N.\} and D. Lazzaretto and M. Leino and J. Louko and A. McCarter and D. O'Donnell and J. Ojala and Page, \{R. D.\} and J. Pakarinen and P. Rahkila and P. Ruotsalainen and J. Sar{\'e}n and E. Uusikyl{\"a} and J. Uusitalo and D. White",

year = "2026",

month = apr,

day = "13",

doi = "10.1103/yt44-ky4x",

language = "English",

volume = "113",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

}

Kokkonen, H, Auranen, K, Aden, P-A, Ahokas, A, Alwadie, N, Bogdanoff, V, Briscoe, AD, Chadderton, J, Grahn, T, Greenlees, PT, Hogg, BJM, Herzáň, A, Joukainen, H, Julin, R, Jutila, H, Khuyagbaatar, J, Landsman, WN, Lazzaretto, D, Leino, M, Louko, J, McCarter, A, O'Donnell, D, Ojala, J, Page, RD, Pakarinen, J, Rahkila, P, Ruotsalainen, P, Sarén, J, Uusikylä, E, Uusitalo, J & White, D 2026, 'Spectroscopy of ²⁰⁹Ac and ²⁰⁷Ac', Physical Review C, vol. 113, 044309. https://doi.org/10.1103/yt44-ky4x

TY - JOUR

T1 - Spectroscopy of 209Ac and 207Ac

AU - Kokkonen, H.

AU - Auranen, K.

AU - Aden, P.-A.

AU - Ahokas, A.

AU - Alwadie, N.

AU - Bogdanoff, V.

AU - Briscoe, A. D.

AU - Chadderton, J.

AU - Grahn, T.

AU - Greenlees, P. T.

AU - Hogg, B. J. M.

AU - Herzáň, A.

AU - Joukainen, H.

AU - Julin, R.

AU - Jutila, H.

AU - Khuyagbaatar, J.

AU - Landsman, W. N.

AU - Lazzaretto, D.

AU - Leino, M.

AU - Louko, J.

AU - McCarter, A.

AU - O'Donnell, D.

AU - Ojala, J.

AU - Page, R. D.

AU - Pakarinen, J.

AU - Rahkila, P.

AU - Ruotsalainen, P.

AU - Sarén, J.

AU - Uusikylä, E.

AU - Uusitalo, J.

AU - White, D.

PY - 2026/4/13

Y1 - 2026/4/13

N2 - 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 , 6⁢𝑛) 209Ac and 175Lu ⁢(36Ar ,4⁢𝑛)⁢ 207Ac fusion-evaporation reactions. The 209Ac 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 207Ac isotope was probed at the focal plane spectrometer of the separator and a 13/2+ (𝜋⁢𝑖13/2) isomeric state was observed for the first time in any 𝑁≤126 actinium isotope.

AB - 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 , 6⁢𝑛) 209Ac and 175Lu ⁢(36Ar ,4⁢𝑛)⁢ 207Ac fusion-evaporation reactions. The 209Ac 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 207Ac isotope was probed at the focal plane spectrometer of the separator and a 13/2+ (𝜋⁢𝑖13/2) isomeric state was observed for the first time in any 𝑁≤126 actinium isotope.

U2 - 10.1103/yt44-ky4x

DO - 10.1103/yt44-ky4x

M3 - Article

SN - 2469-9985

VL - 113

JO - Physical Review C

JF - Physical Review C

M1 - 044309

ER -

Spectroscopy of 209Ac and 207Ac

Abstract

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Spectroscopy of ²⁰⁹Ac and ²⁰⁷Ac