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Lifetime measurements of low-lying states in odd-mass isotopes 117,119Te and the nature of vibration in Te isotopes
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Science and Engineering. Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden.ORCID iD: 0000-0001-7578-1241
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Science and Engineering.ORCID iD: 0000-0003-1996-0805
Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden.ORCID iD: 0000-0001-6996-7605
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Science and Engineering.ORCID iD: 0000-0002-1406-5695
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2025 (English)In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 112, no 1, article id 014321Article in journal (Refereed) Published
Abstract [en]

With the recent lifetime measurements of the 2 + states in Te 116 and Te 118 , the evolution of the collectivity in the midshell region of the Te isotopic chain is starting to reveal itself. However, more information on the structure of the ground-state bands and the nature of the collectivity can be gathered from studying the odd-mass systems, in which lifetimes have not been extensively studied.

The purpose of the present work is to investigate the structure of low-lying excited states of the ν h 11 / 2 band in the odd-mass systems Te 117 and Te 119 , that correspond to the ground-state band in even-even Te.

Lifetimes of low-lying states in the ν h 11 / 2 band of Te 117 are measured for the first time and remeasured in Te 119 , using the recoil distance Doppler shift technique, and analyzed with the differential decay curve method in coincidence mode.

The lifetimes and B (E2) values of the first two transitions, 15 / 2 − → 11 / 2 − and 19 / 2 − → 15 / 2 − , in the ν h 11 / 2 band, are determined in both Te 117 and Te 119 . From the lifetimes, the B (E2) values and corresponding B 4 / 2 ratios are determined. The results are compared to systematics in both even- A and odd- A Te isotopes, as well as with theoretical results from the large-scale shell model and interacting boson model calculations.

While the energy levels of Te 117 and Te 119 , similarly to Te 118 , exhibit textbook vibrational behavior, the unexpectedly small B 4 / 2 ratios of these odd-mass nuclei point to a puzzling discrepancy and question the vibrational nature of these states.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2025. Vol. 112, no 1, article id 014321
National Category
Subatomic Physics
Research subject
Physics, Atomic, Subatomic and Astrophysics
Identifiers
URN: urn:nbn:se:kth:diva-370731DOI: 10.1103/fmgd-tj4wISI: 001538620200003Scopus ID: 2-s2.0-105019760320OAI: oai:DiVA.org:kth-370731DiVA, id: diva2:2002285
Note

QC 20251106

Available from: 2025-09-30 Created: 2025-09-30 Last updated: 2025-11-13Bibliographically approved
In thesis
1. From ideal vibrations to possible anomalies: Insights from tellurium lifetime measurements and modelling
Open this publication in new window or tab >>From ideal vibrations to possible anomalies: Insights from tellurium lifetime measurements and modelling
2025 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work presented in this thesis explores the structure of tellurium (Te) isotopes throughprecise measurements of nuclear lifetimes. Lifetime measurements offer a way of probing theinner structure of the atomic nucleus through its close connection to transition probabilities andcollectivity. The Te isotopic chain acts as an ideal laboratory for studying collectivity in generaland quadrupole vibrations in particular. However, previous measurements have left key gapswhich hindered further understanding of nuclear collectivity and the evolution of structure bothnear the midshell region and towards the most neutron deficient Te nuclei. This work aims to fill those gaps by providing new lifetime data for both even-A (108Te, 118Te) and odd-A (117Te,119Te) isotopes and interpret them using theoretical models.Two experiments were conducted at the JYFL accelerator laboratory in Jyväskylä, Finland. Excited states in Te isotopes were populated using fusion-evaporation reactions. The RecoilDistance Doppler Shift (RDDS) method was the primary tool used for lifetime measurements. In the case of the very neutron deficient 108Te, Recoil Decay Tagging (RDT) helped in isolating the gamma rays associated with its decay. Lifetimes of the 2+ → 0+ and 4+ → 2+ transitions were measured in 118Te with improved precision. With this reduced uncertainty in the B(E2) values of 118Te, together with new lifetime measurements in the odd-mass nuclei 117Te and 119Te presented in this work, the evolution of the structure in midshell region Te is starting to emerge. In 108Te, a new measurement of the 4+→ 2+ lifetime allowed for the calculation of the B4/2 ratio, an important indicator of collectivity. These results contribute towards resolving the unexplained B4/2 anomaly seen in several isotopes, among them 114Te. Finally, a newly developed Python package for IBM/IBFM calculations ispresented, together with results from applications within the Te chain.

Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, 2025. p. 93
Series
TRITA-SCI-FOU ; 2025:50
Keywords
Nuclear physics, gamma spectroscopy, nuclear structure, half-life, shell model, lifetime, collectivity, interacting boson model, vibration, RDDS, DDCM, Kärnfysik, gammaspektroskopi, kärnstruktur, halveringstid, medellivslängd, skalmodell, kollektivitet, vibration, RDDS, DDCM
National Category
Subatomic Physics
Research subject
Physics, Atomic, Subatomic and Astrophysics
Identifiers
urn:nbn:se:kth:diva-370739 (URN)978-91-513-2591-0 (ISBN)
Public defence
2025-10-31, Pärlan, Albano hus 1, plan 6, Roslagsvägen 26, 114 19, Stockholm, 10:00 (English)
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QC 20250930

Available from: 2025-09-30 Created: 2025-09-30 Last updated: 2025-12-16Bibliographically approved

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Ahlgren Cederlöf, EbbaBäck, TorbjörnQi, ChongAtaç, Almina

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Ahlgren Cederlöf, EbbaBäck, TorbjörnNyberg, J.Qi, ChongAtaç, AlminaCalverley, T.Cox, D. M.Doncel, M.Grahn, T.Hilton, J.Konki, J.Papadakis, P.Rahkila, P.Sarén, J.Subramaniam, P.Valiente-Dobón, J. J.
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