Nuclear Energy Levels ofNa24

Abstract

The neutron cross section data up to 350 kev show a number of relatively large peaks and many smaller ones among the 86 peaks observed, the widths ranging from 0.2 to 6 kev. Approximately 50 small peaks were observed between 60 and 200 kev. Above 200 kev, each of the previously known peaks was resolved into two or more peaks and between these large peaks many narrower peaks were observed. The analyses show 9 $s$-wave levels and 46 $p$-wave levels, the remainder being $d$- and $f$-wave levels. A plot of the number of levels having energies $<~E_n$ as a function of the neutron energy $E_n$ shows an essentially linear distribution of the levels. As obtained from the reduced widths averaged over both values of $J$, the value of the strength function for $l=0\mathrm{}$ is 0.06; averaged over all values of $J$ for $l=1\mathrm{}$ it is 0.65; and for higher values of $l$ it is too large in comparison with the $p$-wave strength function.