Level density and $γ$-ray strength in $^{27,28}$Si

Details Level density and $γ$-ray strength in $^{27,28}$Si Level density and $γ$-ray strength in $^{27,28}$Si

2002-03-20

arxiv.org/abs/nucl-ex/0203013v3

J.Phys.G29:263-278,2003

Physics

Nuclear Physics

Nuclear Experiment

Totally 17 pages, 11 figures

Scientific paper

10.1088/0954-3899/29/2/303

A method to extract simultaneously level densities and $\gamma$-ray transmission coefficients has for the first time been tested on light nuclei utilizing the $^{28}$Si($^3$He,$\alpha\gamma)^{27}$Si and $^{28}$Si($^3$He,$^3$He'$\gamma)^{28}$Si reactions. The extracted level densities for $^{27}$Si and $^{28}$Si are consistent with the level densities obtained by counting known levels in the respective nuclei. The extracted $\gamma$-ray strength in $^{28}$Si agrees well with the known $\gamma$-decay properties of this nucleus. Typical nuclear temperatures are found to be $T\sim 2.4$ MeV at around 7 MeV excitation energy. The entropy gap between nuclei with mass number $A$ and $A\pm 1$ is measured to be $\delta S\sim 1.0 k_B$, which indicates an energy spacing between single-particle orbitals comparable with typical nuclear temperatures.

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