Photon Strength Functions and Spin Assignments in 95,96Mo from radiative neutron capture

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dc.contributor.advisor Gary E. Mitchell, Committee Chair en_US Sheets, Steven en_US 2010-04-02T19:02:51Z 2010-04-02T19:02:51Z 2007-05-08 en_US
dc.identifier.other etd-01082007-173654 en_US
dc.description.abstract The $ˆ{94,95}$Mo(n,$gamma$) reaction was studied for neutron energies from thermal to 16 keV. The research was performed at the Detector for Advanced Neutron Capture Experiments (DANCE) at the Los Alamos National Laboratory. The primary motivation for these measurements was to test an enhancement observed in the low energy behavior of the photon strength function in $ˆ{93-98}$Mo by the Olso Cyclotron group. The gamma ray distribution and average gamma cascade multiplicity were measured following resonant neutron capture. These spectra were compared to simulations performed with the statistical model code DICEBOX. Results for a variety of photon strength function and level density models were simulated and compared to experiment. Models of the photon strength function with an Oslo-type enhancement below 1 MeV were unable to reproduce experimental spectra. However, good agreement was found between DANCE spectra and simulations that postulate a low-lying resonance in the photon strength function intermediate in strength between the KMF model and an Oslo-type photon strength function. A second experiment to measure the gamma ray spectra from thermal neutron capture at the Rez facility in Prague was performed with results consistent with the DANCE experiment. New spin assignments were made for resonances in $ˆ{95,96}$Mo using the multiplicity of gamma ray cascades and the gamma ray spectral shape. In $ˆ{96}$Mo 56 resonances were observed with 17 resonances given a new spin assignment and 22 resonances given a tentative spin assignment. For $ˆ{95}$Mo a total of thirty nine resonances were observed with 21 given a parity assignment. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject spin assignments en_US
dc.subject photon strength funtion en_US
dc.subject neutron capture en_US
dc.title Photon Strength Functions and Spin Assignments in 95,96Mo from radiative neutron capture en_US PhD en_US dissertation en_US Physics en_US

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