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Byun, Youngshin accepted dissertation 11-13-13 Fa 13.pdf (7.54 MB)
ETD Abstract Container
Abstract Header
Study of Nuclear Level Density and γ-Strength Function in
90
Zr,
196
Pt, and
197
Pt
Author Info
Byun, Youngshin
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1384464244
Abstract Details
Year and Degree
2013, Doctor of Philosophy (PhD), Ohio University, Physics and Astronomy (Arts and Sciences).
Abstract
Nuclear level density and γ-strength functions have been investigated with two independent experimental methods; one is the evaporation method for
90
Zr by the (d,n) reaction on
89
Y and the other one is the Oslo method for
196
Pt and
197
Pt by the (p,pγ) and (d,pγ) reactions on
196
Pt, respectively. The experimental cross sections of
89
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
+
, 4
-
, and 5
-
of
90
Zr via direct reactions. The experimental level density of
90
Zr is compared with the Fermi-gas and the constant temperature models. We also found the step structure located at E
x
= 4 MeV, resulting from the breaking of Cooper pairs. The measured strength function of
197
Pt was compared to the experimental data of
198
Au taken from Ref. [1]. The extracted parameters of the pygmy resonance for
197
Pt show good agreement with the ones for
198
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
196
Pt(p,pγ) reaction are found in the coincidence matrix of
196
Pt. The new coincidence matrix, which is free of those Al peaks, was obtained by putting a gate on the 2
+
to 0
+
γ-transition populating the ground state of
196
Pt. As a result, consistent results were obtained between
197
Pt and
196
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
197
Pt and
196
Pt well.
Committee
Steven Grimes, PhD (Advisor)
Alexander Voinov, PhD (Advisor)
Douglas Green, PhD (Committee Member)
Carl Brune, PhD (Committee Member)
Daniel Phillips, PhD (Committee Member)
Pages
148 p.
Subject Headings
Nuclear Physics
Keywords
Nuclear Level Density
;
Gamma-Strength Function
;
Evaporation Method
;
Oslo Method
;
Pygmy resonance
Recommended Citations
Refworks
EndNote
RIS
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Citations
Byun, Y. (2013).
Study of Nuclear Level Density and γ-Strength Function in
90
Zr,
196
Pt, and
197
Pt
[Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1384464244
APA Style (7th edition)
Byun, Youngshin.
Study of Nuclear Level Density and γ-Strength Function in
90
Zr,
196
Pt, and
197
Pt.
2013. Ohio University, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1384464244.
MLA Style (8th edition)
Byun, Youngshin. "Study of Nuclear Level Density and γ-Strength Function in
90
Zr,
196
Pt, and
197
Pt." Doctoral dissertation, Ohio University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1384464244
Chicago Manual of Style (17th edition)
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Document number:
ohiou1384464244
Download Count:
1,719
Copyright Info
© 2013, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.