Level densities and $γ$-ray strength functions in $^{170,171,172}$Yb

Details Level densities and $γ$-ray strength functions in $^{170,171,172}$Yb Level densities and $γ$-ray strength functions in $^{170,171,172}$Yb

2004-12-13

arxiv.org/abs/nucl-ex/0412029v1

Phys.Rev. C70 (2004) 054611

Physics

Nuclear Physics

Nuclear Experiment

8 pages, 7 figures

Scientific paper

10.1103/PhysRevC.70.054611

Level densities and radiative strength functions in $^{171}$Yb and $^{170}$Yb nuclei have been measured using the $^{171}$Yb($^3$He,$^3$He$^\prime\gamma$)$^{171}$Yb and $^{171}$Yb($^3$He,$\alpha\gamma$)$^{170}$Yb reactions. New data on $^{171}$Yb are compared to a previous measurement for $^{171}$Yb from the $^{172}$Yb($^3$He,$\alpha\gamma$)$^{171}$Yb reaction. Systematics of level densities and radiative strength functions in $^{170,171,172}$Yb are established. The entropy excess in $^{171}$Yb relative to the even-even nuclei $^{170,172}$Yb due to the unpaired neutron quasiparticle is found to be approximately 2$k_B$. Results for the radiative strength function from the two reactions lead to consistent parameters characterizing the ``pygmy'' resonances. Pygmy resonances in the $^{170,172}$Yb populated by the ($^3$He,$\alpha$) reaction appear to be split into two components for both of which a complete set of resonance parameters are obtained.

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