NEW LIFETIME MEASUREMENTS IN THE RUTHENIUM CHAIN: INVESTIGATING THE EVOLUTION OF TRIAXIALITY

J. S. Heines; V. Modamio; A. Görgen; W. Korten; J. Ljungvall; G. Pasqualato; E. Clément; J. Dudouet; A. Lemasson; S. Ansari; J. M. Allmond; T. Arici; K. S. Beckmann; A. M. Bruce; D. Doherty; A. Esmaylzadeh; E. R. Gamba; L. Gerhard; J. Gerl; G. Georgiev; D. P. Ivanova; J. Jolie; Y. H. Kim; L. Knafla; A. Korichi; P. Koseoglou; M. Labiche; S. Lalkovski; T. Lauritsen; H. J. Li; L. G. Pedersen; S. Pietri; D. Ralet; J. M. Regis; M. Rudigier; S. Saha; E. Sahin; S. Siem; P. Singh; P. A. Söderström; C. Theisen; T. Tornyi; M. Vandebrouck; W. Witt; M. Zielińska

doi:10.5506/APhysPolBSupp.18.2-A22

NEW LIFETIME MEASUREMENTS IN THE RUTHENIUM CHAIN: INVESTIGATING THE EVOLUTION OF TRIAXIALITY

J. S. Heines
, V. Modamio
, A. Görgen
, W. Korten
, J. Ljungvall
, G. Pasqualato
, E. Clément
, J. Dudouet
, A. Lemasson
, S. Ansari
, J. M. Allmond
, T. Arici
, K. S. Beckmann
, A. M. Bruce
, D. Doherty
, A. Esmaylzadeh
, E. R. Gamba
, L. Gerhard
, J. Gerl
, G. Georgiev

D. P. Ivanova, J. Jolie, Y. H. Kim, L. Knafla, A. Korichi, P. Koseoglou, M. Labiche, S. Lalkovski, T. Lauritsen, H. J. Li, L. G. Pedersen, S. Pietri, D. Ralet, J. M. Regis, M. Rudigier, S. Saha, E. Sahin, S. Siem, P. Singh, P. A. Söderström, C. Theisen, T. Tornyi, M. Vandebrouck, W. Witt, M. Zielińska

Nuclear Structure and Nuclear Astrophysi

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

Abstract

We have used the recoil distance Doppler-shift method to measure lifetimes of excited states in ¹⁰⁸Ru, ¹¹⁰Ru, and ¹¹²Ru. Excited states in these nuclei were populated by fusion–fission reactions between a ²³⁸U beam and a ⁹Be target in an experiment at GANIL. Fission fragments were identified event by event in the VAMOS++ spectrometer, while γ-rays were detected by the Advanced Gamma Tracking Array (AGATA). The lifetimes in the ground state band are consistent with rotational structures and constant B(E2) values indicate that the deformation does not change significantly across the chain of studied ruthenium nuclei. Preliminary results for lifetimes of states in the γ-band indicate a well deformed triaxial shape with a γ parameter close to 30^◦ in ¹¹⁰Ru, with a slight change towards oblate deformation in ¹¹²Ru.

Original language	English
Article number	A22
Journal	Acta Physica Polonica B, Proceedings Supplement
Volume	18
Issue number	2
DOIs	https://doi.org/10.5506/APhysPolBSupp.18.2-A22
State	Published - 2025

Funding

The authors would like to thank the AGATA and VAMOS++ collaborations. We are grateful for the help from J. Goupil and the GANIL technical staff for their work in setting up the apparatuses and the good quality beam. The authors would also like to thank G. Fremont for preparing the target and degrader foils. J.S.H., V.M., and A.G. acknowledge support from the Norwegian Research Council projects 325714 and 341985. S.L. acknowledges support by project No. BG-RRP-2.004-0008-C01. P.A.S. acknowledges the support of the Institute of Atomic Physics, Măgurele, Romania, contract number ELI-RO/RDI/2024-002 (CIPHERS), and the Romanian Ministry of Research and Innovation under research contract PN 23 21 01 06.

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10.5506/APhysPolBSupp.18.2-A22

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Heines, J. S., Modamio, V., Görgen, A., Korten, W., Ljungvall, J., Pasqualato, G., Clément, E., Dudouet, J., Lemasson, A., Ansari, S., Allmond, J. M., Arici, T., Beckmann, K. S., Bruce, A. M., Doherty, D., Esmaylzadeh, A., Gamba, E. R., Gerhard, L., Gerl, J., ... Zielińska, M. (2025). NEW LIFETIME MEASUREMENTS IN THE RUTHENIUM CHAIN: INVESTIGATING THE EVOLUTION OF TRIAXIALITY. Acta Physica Polonica B, Proceedings Supplement, 18(2), Article A22. https://doi.org/10.5506/APhysPolBSupp.18.2-A22

@article{13daf6838e2d4e37a80635e7b015dba1,

title = "NEW LIFETIME MEASUREMENTS IN THE RUTHENIUM CHAIN: INVESTIGATING THE EVOLUTION OF TRIAXIALITY",

abstract = "We have used the recoil distance Doppler-shift method to measure lifetimes of excited states in 108Ru, 110Ru, and 112Ru. Excited states in these nuclei were populated by fusion–fission reactions between a 238U beam and a 9Be target in an experiment at GANIL. Fission fragments were identified event by event in the VAMOS++ spectrometer, while γ-rays were detected by the Advanced Gamma Tracking Array (AGATA). The lifetimes in the ground state band are consistent with rotational structures and constant B(E2) values indicate that the deformation does not change significantly across the chain of studied ruthenium nuclei. Preliminary results for lifetimes of states in the γ-band indicate a well deformed triaxial shape with a γ parameter close to 30◦ in 110Ru, with a slight change towards oblate deformation in 112Ru.",

author = "Heines, \{J. S.\} and V. Modamio and A. G{\"o}rgen and W. Korten and J. Ljungvall and G. Pasqualato and E. Cl{\'e}ment and J. Dudouet and A. Lemasson and S. Ansari and Allmond, \{J. M.\} and T. Arici and Beckmann, \{K. S.\} and Bruce, \{A. M.\} and D. Doherty and A. Esmaylzadeh and Gamba, \{E. R.\} and L. Gerhard and J. Gerl and G. Georgiev and Ivanova, \{D. P.\} and J. Jolie and Kim, \{Y. H.\} and L. Knafla and A. Korichi and P. Koseoglou and M. Labiche and S. Lalkovski and T. Lauritsen and Li, \{H. J.\} and Pedersen, \{L. G.\} and S. Pietri and D. Ralet and Regis, \{J. M.\} and M. Rudigier and S. Saha and E. Sahin and S. Siem and P. Singh and S{\"o}derstr{\"o}m, \{P. A.\} and C. Theisen and T. Tornyi and M. Vandebrouck and W. Witt and M. Zieli{\'n}ska",

year = "2025",

doi = "10.5506/APhysPolBSupp.18.2-A22",

language = "English",

volume = "18",

journal = "Acta Physica Polonica B, Proceedings Supplement",

issn = "1899-2358",

number = "2",

}

Heines, JS, Modamio, V, Görgen, A, Korten, W, Ljungvall, J, Pasqualato, G, Clément, E, Dudouet, J, Lemasson, A, Ansari, S, Allmond, JM, Arici, T, Beckmann, KS, Bruce, AM, Doherty, D, Esmaylzadeh, A, Gamba, ER, Gerhard, L, Gerl, J, Georgiev, G, Ivanova, DP, Jolie, J, Kim, YH, Knafla, L, Korichi, A, Koseoglou, P, Labiche, M, Lalkovski, S, Lauritsen, T, Li, HJ, Pedersen, LG, Pietri, S, Ralet, D, Regis, JM, Rudigier, M, Saha, S, Sahin, E, Siem, S, Singh, P, Söderström, PA, Theisen, C, Tornyi, T, Vandebrouck, M, Witt, W & Zielińska, M 2025, 'NEW LIFETIME MEASUREMENTS IN THE RUTHENIUM CHAIN: INVESTIGATING THE EVOLUTION OF TRIAXIALITY', Acta Physica Polonica B, Proceedings Supplement, vol. 18, no. 2, A22. https://doi.org/10.5506/APhysPolBSupp.18.2-A22

TY - JOUR

T1 - NEW LIFETIME MEASUREMENTS IN THE RUTHENIUM CHAIN

T2 - INVESTIGATING THE EVOLUTION OF TRIAXIALITY

AU - Heines, J. S.

AU - Modamio, V.

AU - Görgen, A.

AU - Korten, W.

AU - Ljungvall, J.

AU - Pasqualato, G.

AU - Clément, E.

AU - Dudouet, J.

AU - Lemasson, A.

AU - Ansari, S.

AU - Allmond, J. M.

AU - Arici, T.

AU - Beckmann, K. S.

AU - Bruce, A. M.

AU - Doherty, D.

AU - Esmaylzadeh, A.

AU - Gamba, E. R.

AU - Gerhard, L.

AU - Gerl, J.

AU - Georgiev, G.

AU - Ivanova, D. P.

AU - Jolie, J.

AU - Kim, Y. H.

AU - Knafla, L.

AU - Korichi, A.

AU - Koseoglou, P.

AU - Labiche, M.

AU - Lalkovski, S.

AU - Lauritsen, T.

AU - Li, H. J.

AU - Pedersen, L. G.

AU - Pietri, S.

AU - Ralet, D.

AU - Regis, J. M.

AU - Rudigier, M.

AU - Saha, S.

AU - Sahin, E.

AU - Siem, S.

AU - Singh, P.

AU - Söderström, P. A.

AU - Theisen, C.

AU - Tornyi, T.

AU - Vandebrouck, M.

AU - Witt, W.

AU - Zielińska, M.

PY - 2025

Y1 - 2025

N2 - We have used the recoil distance Doppler-shift method to measure lifetimes of excited states in 108Ru, 110Ru, and 112Ru. Excited states in these nuclei were populated by fusion–fission reactions between a 238U beam and a 9Be target in an experiment at GANIL. Fission fragments were identified event by event in the VAMOS++ spectrometer, while γ-rays were detected by the Advanced Gamma Tracking Array (AGATA). The lifetimes in the ground state band are consistent with rotational structures and constant B(E2) values indicate that the deformation does not change significantly across the chain of studied ruthenium nuclei. Preliminary results for lifetimes of states in the γ-band indicate a well deformed triaxial shape with a γ parameter close to 30◦ in 110Ru, with a slight change towards oblate deformation in 112Ru.

AB - We have used the recoil distance Doppler-shift method to measure lifetimes of excited states in 108Ru, 110Ru, and 112Ru. Excited states in these nuclei were populated by fusion–fission reactions between a 238U beam and a 9Be target in an experiment at GANIL. Fission fragments were identified event by event in the VAMOS++ spectrometer, while γ-rays were detected by the Advanced Gamma Tracking Array (AGATA). The lifetimes in the ground state band are consistent with rotational structures and constant B(E2) values indicate that the deformation does not change significantly across the chain of studied ruthenium nuclei. Preliminary results for lifetimes of states in the γ-band indicate a well deformed triaxial shape with a γ parameter close to 30◦ in 110Ru, with a slight change towards oblate deformation in 112Ru.

UR - https://www.scopus.com/pages/publications/105004182815

U2 - 10.5506/APhysPolBSupp.18.2-A22

DO - 10.5506/APhysPolBSupp.18.2-A22

M3 - Article

AN - SCOPUS:105004182815

SN - 1899-2358

VL - 18

JO - Acta Physica Polonica B, Proceedings Supplement

JF - Acta Physica Polonica B, Proceedings Supplement

IS - 2

M1 - A22

ER -

NEW LIFETIME MEASUREMENTS IN THE RUTHENIUM CHAIN: INVESTIGATING THE EVOLUTION OF TRIAXIALITY

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