Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-06-13
Physics
Nuclear Physics
Nuclear Theory
12 pages (two columns), 13 figures (16 graphs), 3 tables, revtex4, bibTeX, pdfTeX
Scientific paper
We study the spin-parity distribution P(J$^{\pi}$,E) of $^{156}$Gd excited states above the neutron separation energy that are expected to be populated via the neutron pickup reaction $^{157}$Gd($^{3}$He,$^{4}$He)$^{156}$Gd. In general, modeling of the spin-parity distribution is important for the applicability of the surrogate reaction technique as a method of deducing reaction cross sections. We model excited states in $^{156}$Gd as rotational states built on intrinsic states consisting of a hole in the core where the hole represents neutron removal form a deformed single particle state. The reaction cross section to each excited state is calculated using standard reaction code that uses spherical reaction form-factor input. The spectroscopic factor associated with each form-factor is the expansion coefficient of the deformed neutron state in a spherical Sturmian basis consisting of the spherical reaction form-factors.
Dietrich Frank S.
Escher Jutta E.
Gueorguiev Vesselin G.
Kunz P. D.
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