Interactions of slow neutrons with the chromium isotopes

Abstract

Neutron transmission experiments and determinations of coherent scattering lengths were performed on natural chromium and enriched samples of 5~ S2Cr, 53Cr and 54Cr. By means of the Christiansen-filter-technique we obtained new values for the scattering lengths of the bound atoms: Data for incoherent and spin-state scattering and for the potential-scattering radius of the nuclei could be deduced from these results.

Neutron scattering lengths of the isotopes of thulium, ytterbium and lutetium

“…The small angle scattering from the target was eliminated by choosing a target position in the beam line from which all forward scattered neutrons hit the neutron detector. For details of the technique and data reduction we refer to [3]. The samples in form of oxides or fluorides of the elements have been desiccated by heating in an inert gas atmosphere up to temperatures listed in Table 1.…”

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

“…[3]. It is striking that many nuclei with masses in the region of 40 < A < 55 exhibit negative scattering lengths (reported in earlier papers for 43Ca [4] and for 5~ and 53Cr [5]; again reported in this paper for 48Ti, slV and 55Mn).…”

“…Details are described in [5] on the procedure to find the correct sample position from which practically no forward scattered neutrons hit the BF 3-detector. The total cross sections were determined from transmission experiments at various quasi-mono-energetic neutron beams.…”

Neutron interactions with germanium isotopes and amorphous and crystalline GeO2

“…The small angle scattering from powdered samples has been eliminated by a special arrangement of the target at a position from which all forward scattered neutrons hit the neutron detector. For details we refer to [9]. This device and the installations mentioned in the introduction for transmission measurements at 1.2 and 5.2 eV provide narrow neutron beams with diameters as small as 0.3 cm which are required for measurements on the small targets of isotopically enriched samples.…”