dc.contributor.author | Ojala, Joonas | |
dc.date.accessioned | 2023-01-27T11:28:54Z | |
dc.date.available | 2023-01-27T11:28:54Z | |
dc.date.issued | 2023 | |
dc.identifier.isbn | 978-951-39-9288-0 | |
dc.identifier.uri | https://jyx.jyu.fi/handle/123456789/85223 | |
dc.description.abstract | Structures in <sup>186</sup>Pb have been under extensive investigation for several decades.
<sup>186</sup>Pb is the system having a low-lying triplet of zero-spin states, which are assigned
with different shapes (spherical, prolate and oblate). This nucleus has been
previously studied using α-decay and in-beam γ-ray spectroscopic methods but
the transitions near the ground state remained a mystery due to the large conversion
coefficient. In this thesis, the low-lying structure of <sup>186</sup>Pb was experimentally
investigated by combined γ-ray and electron spectrometer, SAGE, and utilising
the recoil-decay tagging method. As a result, the E0 2<sup>+</sup><sub>2</sub> → 2<sup>+</sup><sub>1</sub> and 4<sup>+</sup>
<sub>2</sub> → 4<sup>+</sup><sub>1</sub>
interband transitions could be assessed. Also, the feeding of the first excited 0<sup>+</sup>
<sub>2</sub>
state was observed for the first time. Results allowed for reassigning the shapes of
0<sup>+</sup> states in <sup>186</sup>Pb, which provide input for new theoretical calculations.
Recent developments for in-beam γ-ray spectroscopy at the Accelerator Laboratory
of Jyväskylä forms part of this thesis work. The properties of the JUROGAM 3
germanium array, such as energy resolution, add-back factor and photopeak
detection efficiency, can be found in the fifth chapter. Also, the sum-peak method
to determine the absolute photopeak detection efficiency of a germanium array is
explained in this chapter. The issue with pile-up marking in the DAQ system is
also raised to notify other potential users. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | |
dc.publisher | Jyväskylän yliopisto | |
dc.relation.ispartofseries | JYU dissertations | |
dc.rights | In Copyright | |
dc.title | Combined γ-ray and electron spectroscopy : study of shape coexistence in 186Pb | |
dc.type | Diss. | |
dc.identifier.urn | URN:ISBN:978-951-39-9288-0 | |
dc.contributor.tiedekunta | Faculty of Mathematics and Science | en |
dc.contributor.tiedekunta | Matemaattis-luonnontieteellinen tiedekunta | fi |
dc.contributor.yliopisto | University of Jyväskylä | en |
dc.contributor.yliopisto | Jyväskylän yliopisto | fi |
dc.relation.issn | 2489-9003 | |
dc.rights.copyright | © The Author & University of Jyväskylä | |
dc.rights.accesslevel | openAccess | |
dc.type.publication | doctoralThesis | |
dc.format.content | fulltext | |
dc.rights.url | https://rightsstatements.org/page/InC/1.0/ | |