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M1 and E2 transition rates from core-excited states in semi-magic 94Ru
KTH, School of Engineering Sciences (SCI), Physics. Istanbul University Vezneciler/Fatih, Istanbul, Turkey.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0002-1406-5695
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Lifetimes of high-spin states have been measured in the semi-magic (N=50) nucleus 94Ru. Excited states in 94Ru were populated in the 58Ni(40Ca, 4p)94Ru fusion-evaporation reaction at the Grand Accelerateur National d’Ions Lourds (GANIL) accelerator complex. DSAM lifetime analysis was performed on the Doppler broadened line shapes in energy spectra obtained from γ-rays emitted while the residual nuclei were slowing down in a thick 6 mg/cm2 metallic 58Ni target. In total eight excited-state lifetimes in the angular momentum range I = (13 − 20)ħ have been measured, five of which were determined for the first time. The deduced corresponding B(M1) and B(E2)reduced transition strengths are discussed within the framework of large-scale shell model calculations to study the contribution of different particle-hole configurations, in particular for analyzing contributions from core-excited configurations.

National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-217351OAI: oai:DiVA.org:kth-217351DiVA: diva2:1155849
Note

QC 20171109

Available from: 2017-11-09 Created: 2017-11-09 Last updated: 2017-11-10Bibliographically approved
In thesis
1. Lifetime Measurements of Excited States in the Semi-Magic Nucleus 94Ru
Open this publication in new window or tab >>Lifetime Measurements of Excited States in the Semi-Magic Nucleus 94Ru
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Lifetimes of highly excited states in the semi-magic (N=50) nucleus 94Ru were deduced from an analysis of the Doppler broadened transition line shapes. Excited states in 94Ru were populated in the 58Ni(40Ca, 4p)94Ru fusion-evaporation reaction at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator complex situated in Caen, France. Doppler Shift Attenuation Method (DSAM) lifetime analysis was performed on the Doppler broadened peaks in energy spectra from γ-rays emitted while the residual nuclei were slowing down in a thick 6 mg/cm2 metallic 58Ni target. In total eight excited-state lifetimes in the angular momentum range I = (13 − 20)ħ have been measured, five of which were determined for the first time. The deduced corresponding B(M1) and B(E2) reduced transition strengths are discussed within the framework of large-scale shell model calculations.

Abstract [sv]

Livstider för exciterade tillstånd i den semimagiska (N = 50) atomkärnan 94Ru har uppmätts från en analys av Doppler-breddade övergångslinjer. Exciterade tillstånd i 94Ru har populerats i 58Ni(40Ca, 4p)94Ru fusion-evaporationsreaktioner vid partikelacceleratorn Grand Accélérateur National d’Ions Lourds (GANIL), Caen, Frankrike. Livstidsanalys utfördes med hjälp av Dopplerskiftsattenueringsmetoden (DSAM) på linjer i energispektra uppmätta från gammastrålning som emitterades medan de högt exciterade atomkärnorna bromsades ned i ett homogent metalliskt strålmål av 6 mg/cm2 tjocklek. Mätmetoden har verifierats med hjälp av data från en mätning utförd med en alternativ metod. Livstider för sammanlagt åtta exciterade tillstånd i spinn-intervallet I = (13 − 20)ħ har uppmätts, varav fem bestämdes för första gången. Ur dessa har härletts B(M1) och B(E2) övergångssannolikheter vilka diskuteras inom ramen för storskaliga skalmodellsberäkningar.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 33 p.
Series
TRITA-FYS, ISSN 0280-316X ; 2017:73
Keyword
nuclear structure, lifetime measurements, doppler shift attenuation method, thick target
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-217356 (URN)978-91-7729-601-0 (ISBN)
Presentation
2017-11-23, FB-55, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 14:00 (English)
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Supervisors
Note

QC 20171110

Available from: 2017-11-10 Created: 2017-11-09 Last updated: 2017-11-10Bibliographically approved

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