Neutron Induced Cross Sections for Radiochemistry for Isotopes of Arsenic

Abstract

We have developed a set of modeled nuclear reaction cross sections for use in radiochemical diagnostics. Local systematics for the input parameters required by the Hauser-Feshbach statistical model were developed and used to calculate neutron induced nuclear reaction cross sections for isotopes of Arsenic (Z = 33) in the mass range 71 ≤ A ≤ 77.

Neutron Induced Cross Sections for Radiochemistry for Isotopes of Nickel, Copper, and Zinc

“…This optical model has produced favorable comparisons to measured total neutron cross sections in the regions of scandium, titanium, vanadium, chromium, manganese, and iron (Kelley et al 2005), arsenic (Kelley et al 2006), bromine and krypton (Hoffman et al 2004a), and iodine and xenon (Hoffman et al 2004b). Additionally, comparisons made in (Koning & Delaroche 2003) indicate that this optical potential does very well in replicating total cross sections, differential elastic cross sections, and analysing power measurements for both incident neutrons and protons.…”

“…In previous efforts we have performed similar analysis for several other neutron and/or charged particle detector sets, including 79 Br producing 79 Kr (Hoffman et al 2004a), 127 I producing 127 Xe (Hoffman et al 2004b), stable europium producing [147][148][149][150]152,154 Eu and 151,153 Gd (Hoffman et al 2004c) (Kelley et al 2005), and stable 75 As producing 73,74 As (Kelley et al 2006). This paper details the unclassified cross section modeling effort.…”

“…The theoretical techniques embodied by the STAPRE-H95 code used in our modeling effort, including the Hauser-Feshbach model, width fluctuation correlations, and the exciton preequilibirium model, have been thoroughly documented in previous reports (Hoffman et al 2004a-c;Kelley et al 2005Kelley et al ,2006 and will not be repeated here. In §2 we present the input parameters used in our modeling effort and detail the development of systematics for level density parameters and gamma ray transmission coefficient normalizations.…”

“…The demarcation point will be roughly between the energy range of the known excited levels of a given compound nucleus (the low energy domain), and near the neutron binding energy (the high energy domain). The process of developing local systematics for the level density has been thoroughly described in previous papers (Hoffman et al 2004a;Hoffman et al 2004b;Hoffman et al 2004c;Kelley et al 2005;Kelley et al 2006), and we will only touch on the more salient points in the present work. For the high energy domain, we describe the level density assuming a backshifted Fermi gas formula,…”

Modeled Neutron Induced Nuclear Reaction Cross Sections for Radiochemistry in the region of Iriduim and Gold

“…Previous papers treated the regions of bromine and krypton (Hoffman et al 2004a), iodine and xenon (Hoffman et al 2004b), samarium, europium, and gadolinium (Hoffman et al 2004c), scandium, titanium, vanadium, chromium, manganese, and iron (Kelley et al 2005), arsenic (Kelley et al 2006a), nickel, copper, and zinc (Kelley et al 2006b), and yttrium, zirconium, niobium, and molybdenum (Hoffman et al 2006c). Here we focus on neutron-induced reactions proceeding on targets of iridium and gold.…”