Determining the lifetime of the first 4+ state in 182Pt

In this work the mean lifetime of the First 4+ state in 182Pt was determined by using the Recoil Distance Doppler-Shift method. The studied nuclei were produced in the 86Kr(100Mo, 4n)182Pt fusion-evaporation reaction. The RDDS method exploits the fact that the observed γ-ray energy depends on the ve...

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Main Author: Stolze, Sanna
Other Authors: Matemaattis-luonnontieteellinen tiedekunta, Faculty of Sciences, Fysiikan laitos, Department of Physics, University of Jyväskylä, Jyväskylän yliopisto
Format: Master's thesis
Language:eng
Published: 2011
Subjects:
Online Access: https://jyx.jyu.fi/handle/123456789/37452
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author Stolze, Sanna
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Fysiikan laitos Department of Physics University of Jyväskylä Jyväskylän yliopisto
author_facet Stolze, Sanna Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Fysiikan laitos Department of Physics University of Jyväskylä Jyväskylän yliopisto Stolze, Sanna Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Fysiikan laitos Department of Physics University of Jyväskylä Jyväskylän yliopisto
author_sort Stolze, Sanna
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description In this work the mean lifetime of the First 4+ state in 182Pt was determined by using the Recoil Distance Doppler-Shift method. The studied nuclei were produced in the 86Kr(100Mo, 4n)182Pt fusion-evaporation reaction. The RDDS method exploits the fact that the observed γ-ray energy depends on the velocity of the emitting nucleus. Using a degrader foil after the target enables measuring the intensities of γ-rays emitted before and after the degrader. The recoil-gated γγ spectra were analyzed separately for each target-to-degrader distance and the lifetime was determined with the Differential Decay Curve Method, which takes into account the lifetimes of the feeding states. The lifetime of the 4+ state in 182Pt was determined to be τ = 40:8(14) ps. This corresponds to a transition quadrupole moment of |Qt| = 6:90(12) eb. When comparing the quadrupole moment to other N = 104 isotones it is clear, even when taking into account the charge dependence of the quadrupole moment, that the quadrupole moment of the prolate 4+ state in 186Pb is significantly larger. Also the quadrupole moments decrease with decreasing Z. Before drawing any final conclusions about the collectivity of the prolate band in 182Pt it is neccessary to determine the lifetimes of other yrast excited states at low energies.
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The studied nuclei were produced in the 86Kr(100Mo, 4n)182Pt fusion-evaporation reaction. The RDDS method exploits the fact that the observed \u03b3-ray energy depends on the velocity of the emitting nucleus. Using a degrader foil after the target enables measuring the intensities of \u03b3-rays emitted before and after the degrader. The recoil-gated \u03b3\u03b3 spectra were analyzed separately for each target-to-degrader distance and the lifetime was determined with the Differential Decay Curve Method, which takes into account the lifetimes of the feeding states. The lifetime of the 4+ state in 182Pt was determined to be \u03c4 = 40:8(14) ps. This corresponds to a transition quadrupole moment of |Qt| = 6:90(12) eb. When comparing the quadrupole moment to other N = 104 isotones it is clear, even when taking into account the charge dependence of the quadrupole moment, that the quadrupole moment of the prolate 4+ state in 186Pb is significantly larger. 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spellingShingle Stolze, Sanna Determining the lifetime of the first 4+ state in 182Pt Fysiikka Physics 4021 fysiikka
title Determining the lifetime of the first 4+ state in 182Pt
title_full Determining the lifetime of the first 4+ state in 182Pt
title_fullStr Determining the lifetime of the first 4+ state in 182Pt Determining the lifetime of the first 4+ state in 182Pt
title_full_unstemmed Determining the lifetime of the first 4+ state in 182Pt Determining the lifetime of the first 4+ state in 182Pt
title_short Determining the lifetime of the first 4+ state in 182Pt
title_sort determining the lifetime of the first 4+ state in 182pt
title_txtP Determining the lifetime of the first 4+ state in 182Pt
topic Fysiikka Physics 4021 fysiikka
topic_facet 4021 Fysiikka Physics fysiikka
url https://jyx.jyu.fi/handle/123456789/37452 http://www.urn.fi/URN:NBN:fi:jyu-201202271303
work_keys_str_mv AT stolzesanna determiningthelifetimeofthefirst4+statein182pt