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Persistent vibrational collectivity in neutron deficient 108Te
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Science and Engineering. Uppsala University.ORCID iD: 0000-0001-7578-1241
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Science and Engineering.ORCID iD: 0000-0003-1996-0805
Uppsala University.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Science and Engineering.ORCID iD: 0000-0002-1406-5695
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(English)Manuscript (preprint) (Other academic)
National Category
Subatomic Physics
Research subject
Physics, Atomic, Subatomic and Astrophysics
Identifiers
URN: urn:nbn:se:kth:diva-370735OAI: oai:DiVA.org:kth-370735DiVA, id: diva2:2002307
Note

QC 20250930

Available from: 2025-09-30 Created: 2025-09-30 Last updated: 2025-09-30Bibliographically 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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Note

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, ChongGhazi Moradi, FarnazCederwall, BoLiotta, Roberto

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