Level densities and gamma-ray strength functions in 170,171,172-Yb [electronic resource]
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| Online Access: |
Online Access (via OSTI) |
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| 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,
2004.
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| Subjects: |
| Abstract: | Level densities and radiative strength functions in ¹⁷¹Yb and ¹⁷°Yb nuclei have been measured using the ¹⁷¹Yb(³He³Heγ)¹⁷¹Yb and ¹⁷¹Yb(³He,αγ)¹⁷°Yb reactions. New data on ¹⁷¹Yb are compared to a previous measurement for ¹⁷¹Yb from the ¹⁷²Yb(³He,αγ)¹⁷¹Yb reaction. Systematics of level densities and radiative strength functions in {sup 170,171,172}Yb are established. The entropy excess in ¹⁷¹Yb relative to the even-even nuclei {sup 170,172}Yb due to the unpaired neutron quasiparticle is found to be approximately 2k{sub B}. Results for the radiative strength function from the two reactions lead to consistent parameters characterizing the ''pygmy'' resonances. Pygmy resonances in the {sup 170,172}Yb populated by the (³He,α) reaction appear to be split into two components for both of which a complete set of resonance parameters are obtained. |
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| Item Description: | Published through SciTech Connect. 07/28/2004. "ucrl-tr-205726" Agvaanluvsan, U; Schiller, A; Becker, J; Bernstein, L; Garrett, P; Guttormsen, M; Mitchell, G; Rekstad, J; Siem, S; Voinov, A; Younes, W. |
| Physical Description: | PDF-file: 16 pages; size: 0.4 Mbytes. |