Texture Science and Technology

Abstract

This project is directed at advancing research and development in texture and anisotropy at Los Alamos. We are recognized as a national and international leader in texture and anisotropy research. This recognition is based on our understanding involving both quantitative texture analysis and the understanding and modeling of processes under which texture develops. In addition to these resources, we have available the full troika of texture measurement techniques, namely, x-ray, electron diffraction, and neutron diffraction. The goals of this project were (1) to increase the utilization of texture and anisotropy both within and without the Laboratory programmatic, basic, and industrial related efforts; (2) to seek to improve our texture measurement and modeling capabilities; and (3) to maintain our recognition as an international leader through basic research. These goals were accomplished through the formation of a coherent focus on texture directed through the CMS to coordinate texture efforts at the Laboratory as well as advancing the field in analysis, measurement and interpretation. The "texture focus" has essentially four functions: One, to manage the physical measurement systems; two, to coordinate human resources at the lab; three, to serve as a resource for both external and internal users; and four, to advance the field of texture analysis at all levels and keep it at the forefront.

Leading neutron production in e+p collisions at HERA

“…3 One-pion-exchange model A successful description of the available data [24][25][26][27][28][29][30][31][32][33] on charge-exchange processes (p → n) in hadron-hadron interactions has been obtained using the exchange of virtual particles with the quantum numbers of the π, ρ, and a 2 mesons [13-17, 20, 21]. In such processes, the pion, due to its small mass, dominates the p → n transition amplitude, with its relative contribution increasing as |t| decreases.…”

“…Some theoretical models retain the QCD building blocks, quarks and gluons, as fundamental entities but add non-perturbative elements, such as soft color interactions [12]. Another approach interprets the production of forward baryons in terms of the exchange of virtual particles [13][14][15][16][17][18][19][20][21][22][23], which accounts for charge-exchange processes (p → n) in hadronic interactions [24][25][26][27][28][29][30][31][32][33]. In leading neutron production, the large diffractive peak in the cross section, which is observed in leading proton production [4,5], is absent.…”

Forward neutron production at the Fermilab Main Injector

“…For some of the published data, the measurements are at discrete production angles making it impossible to directly compare them with our results [20,21,22]. We have compared our measurements with the results from the NA49 experiment that measured neutron production from p+p collisions at 158 GeV/c [23].…”

Factorization breaking in dijet photoproduction with a leading neutron

“…A successful phenomenological description of the corresponding data has been given in the framework of reggeized isovector exchanges, such as π, ρ and a 2 with the pion dominating the p → n transition, in particular at small squared momentum transfer t between proton and neutron [12]. Unfortunately these cross sections are not given by pure Reggeexchange amplitudes.…”