Scattering and resonance properties of the interaction of slow neutrons with the isotopes of silicon and sulfur

Abstract

Neutron scattering lengths and, partly, absorption and free scattering cross sections were determined for natural silicon and sulfur and for their isotopes with the masses 28, 29, 30, 32, 33 and 34 Transmission experiments with neutrons of 510 geV, 1.26 eV and 5.19 eV energy resulted in data for the absorption and free scattering cross sections of the natural elements Si and S. From all these results a complete set of scattering parameters could be deduced for each nucleus. By comparing these data with resonance parameters we obtained additional information about resonance properties and potential scattering.

Thermal neutron scattering parameters for light nuclei (A=12 to 27)

“…These differences are shown as a function of the nuclear mass number A in Fig. 2 completed with data at higher A taken from a previous work [5]. The variation of R' in the range of A >22 corresponds to the expectations based on the optical model.…”

Interaction of slow neutrons with nuclides of scandium, titanium, vanadium and manganese

“…The mean scattering length of Mn, obtained from measurements on various manganese compounds (last column of Table 1) was b = -3.750 (18) fm, in agreement with the value of [12], which is a previous unpublished communication from our institute.…”

“…For higher certainty we also compared the results on solid samples with measurements on a Sc203-compound which was dried at 1270 K in air atmosphere. -The solid samples of Ti and V had a metallic purity of 99.95% and [ 17] and some other unpublished measurements, bsi = 4.148 (1) fin [ 18], bso , = 26.08 (2) fm [ 17,18], bcl = 9.5792(8) fm [19] and bBr = 6.77(2) fm [20] (116) a abundance of the Ti-isotope all samples are air-dried variation in the density give rise to a mixture of crystalline modifications d obtained with b0= 5.807(3) fm [17] and some other unpublished measurements 99.97%, respectively. To eliminate a possible gas content they were heated up to about 1700 K in ultra high vacuum.…”