Radiative Strength Functions in 172Yb below 8 Me V [electronic resource]
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| Online Access: |
Online Access (via OSTI) |
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| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2002.
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| Subjects: |
| Abstract: | We have measured prompt γ rays after thermal and resonant neutron capture in ¹⁷¹Yb. The γ rays were measured with three high resolution (≈3 keV) and high efficiency (two ≈80% Ge(HP) and one ≈200% segmented Clover) detectors. We have obtained singles and two-fold coincidence spectra as function of neutron energy using the time-of-flight technique. Two-fold coincidences where the summed energy adds up to the neutron binding energy B{sub n} or to B{sub n} minus the energy of the first excited stated (≈79 keV) will be used to determine the multipolarity of the pygmy resonance in ¹⁷²Yb. This pygmy resonance is a resonant structure in the radiative strength function around ≈3 MeV in deformed rare earth nuclei [1]. The following goals were met: (1) We have shown the feasibility of prompt, high-resolution γ spectroscopy at FP14 after thermal as well as resonant neutron capture. (2) Online analysis shows that sufficient statistics (≈7000 counts) are expected in each of the two relevant peaks in the summed-energy spectrum. Analysis of the experiment is in progress. It still remains to show that the multipolarity of the pygmy resonance can be determined experimentally from two-step cascade intensities. |
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| Item Description: | Published through SciTech Connect. 02/06/2002. "ucrl-id-147425" Schiller, A; Becker, J A; Bernstein, L A; Garrett, P E; Hill, T S; McNabb, D P; Younes, W; Tavukcu, E; Vomov, A; Guttormsen, M; Rekstad, J; Siem, S. |
| Physical Description: | PDF-FILE: 5 ; SIZE: 0.2 MBYTES pages. |