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http://hdl.handle.net/11375/6183
Title: | Electric Quadrupole Radiation Strength in Neutron Capture |
Authors: | Islam, Aminul M. |
Advisor: | Prestwich, W.V. |
Department: | Physics |
Keywords: | Physics;Physics |
Publication Date: | Nov-1982 |
Abstract: | <p>A high resolution NaI(Tl) -Ge pair spectrometer has been used to detect the primary E2 transitions following thermal neutron capture in ¹⁴³Nd, ¹⁶²Dy, ¹⁶⁴Dy, ¹⁶⁵Ho, ¹⁶⁷Er, ¹⁷³Yb and ¹⁷⁹Hf. These data, as well as other thermal, resonance and average-resonance data have been analyzed to study the radiative quadrupole strength. Some calculations have been done to retrieve the E2 intensities from the average-resonance work. A quantitative theoretical expression for the quadrupole strength function on the basis of the giant quadrupole resonance model is deduced. A comparison between the experimental and theoretical values for nuclei spanning the mass region between A=12 to A=239 shows the presence of the influence of the GQR on the radiation strength. A depression in the quadrupole strength has been observed in the mass range 144</p> <p>The energy and intensity of all the observed high energy transitions in most of the nuclei under study are presented. A set of neutron separation energies of 15 isotopes of Nd, Gd, Dy, Ho, Er, Yb and Hf has been estimated. The thermal radiative capture cross section of ¹⁴N, a standard used in this work, is determined with improved precision.</p> |
URI: | http://hdl.handle.net/11375/6183 |
Identifier: | opendissertations/1512 2181 1264615 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
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fulltext.pdf | 3.45 MB | Adobe PDF | View/Open |
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