Study of Nuclear Level Density and γ-Strength Function in 90Zr, 196Pt, and 197Pt

Bibliographic Details
Main Author:	Byun, Youngshin
Language:	English
Published:	Ohio University / OhioLINK 2013
Subjects:	Nuclear Physics Nuclear Level Density Gamma-Strength Function Evaporation Method Oslo Method Pygmy resonance
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1384464244

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou13844642442021-08-03T06:20:21Z Study of Nuclear Level Density and γ-Strength Function in <sup>90</sup>Zr, <sup>196</sup>Pt, and <sup>197</sup>Pt Byun, Youngshin Nuclear Physics Nuclear Level Density Gamma-Strength Function Evaporation Method Oslo Method Pygmy resonance Nuclear level density and γ-strength functions have been investigated with two independent experimental methods; one is the evaporation method for <sup>90</sup>Zr by the (d,n) reaction on <sup>89</sup>Y and the other one is the Oslo method for <sup>196</sup>Pt and <sup>197</sup>Pt by the (p,pγ) and (d,pγ) reactions on <sup>196</sup>Pt, respectively.The experimental cross sections of <sup>89</sup>Y(d,n) were compared with EMPIRE calculations. Comparison indicates that the energy dependence of the neutron evaporation cross sections is consistent with the one from theoretical calculation but the magnitude of our experimental data points is lower than calculations by a factor of 2. In the measured cross section, broad peaks are also observed at the outgoing neutron energies of 8.5-10 MeV and 10-11.5 MeV for the bombarding deuteron energies of 6 and 7.5 MeV, respectively. These peaks might be produced due to strongly populated states 0<sup>+</sup>, 4<sup>-</sup>, and 5<sup>-</sup> of <sup>90</sup>Zr via direct reactions. The experimental level density of <sup>90</sup>Zr is compared with the Fermi-gas and the constant temperature models. We also found the step structure located at E<sub>x</sub> = 4 MeV, resulting from the breaking of Cooper pairs.The measured strength function of <sup>197</sup>Pt was compared to the experimental data of <sup>198</sup>Au taken from Ref. [1]. The extracted parameters of the pygmy resonance for <sup>197</sup>Pt show good agreement with the ones for <sup>198</sup>Au, implying that both nuclei have the similar nuclear structure. However, several pronounced lines due to contamination by the aluminum exposed to a proton beam in the <sup>196</sup>Pt(p,pγ) reaction are found in the coincidence matrix of <sup>196</sup>Pt. The new coincidence matrix, which is free of those Al peaks, was obtained by putting a gate on the 2<sup>+</sup> to 0<sup>+</sup> γ-transition populating the ground state of <sup>196</sup>Pt. As a result, consistent results were obtained between <sup>197</sup>Pt and <sup>196</sup>Pt data. Comparing to theoretical models, we can conclude that the Lorentzian with the energy dependent damping width with the varying temperature and the generalized Lorentzian model with the constant temperature reproduce the measured γ-strength functions for <sup>197</sup>Pt and <sup>196</sup>Pt well. 2013 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1384464244 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1384464244 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Nuclear Physics Nuclear Level Density Gamma-Strength Function Evaporation Method Oslo Method Pygmy resonance
spellingShingle	Nuclear Physics Nuclear Level Density Gamma-Strength Function Evaporation Method Oslo Method Pygmy resonance Byun, Youngshin Study of Nuclear Level Density and γ-Strength Function in <sup>90</sup>Zr, <sup>196</sup>Pt, and <sup>197</sup>Pt
author	Byun, Youngshin
author_facet	Byun, Youngshin
author_sort	Byun, Youngshin
title	Study of Nuclear Level Density and γ-Strength Function in <sup>90</sup>Zr, <sup>196</sup>Pt, and <sup>197</sup>Pt
title_short	Study of Nuclear Level Density and γ-Strength Function in <sup>90</sup>Zr, <sup>196</sup>Pt, and <sup>197</sup>Pt
title_full	Study of Nuclear Level Density and γ-Strength Function in <sup>90</sup>Zr, <sup>196</sup>Pt, and <sup>197</sup>Pt
title_fullStr	Study of Nuclear Level Density and γ-Strength Function in <sup>90</sup>Zr, <sup>196</sup>Pt, and <sup>197</sup>Pt
title_full_unstemmed	Study of Nuclear Level Density and γ-Strength Function in <sup>90</sup>Zr, <sup>196</sup>Pt, and <sup>197</sup>Pt
title_sort	study of nuclear level density and γ-strength function in <sup>90</sup>zr, <sup>196</sup>pt, and <sup>197</sup>pt
publisher	Ohio University / OhioLINK
publishDate	2013
url	http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1384464244
work_keys_str_mv	AT byunyoungshin studyofnuclearleveldensityandgstrengthfunctioninsup90supzrsup196supptandsup197suppt
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Study of Nuclear Level Density and γ-Strength Function in <sup>90</sup>Zr, <sup>196</sup>Pt, and <sup>197</sup>Pt

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