Issue 10 Volume 41 May 16, 2003

antiproton production cross section. The LAQGSM model has been shown to reproduce well nuclear reactions and hadronic
data in the range 0.01-800 GeV/nucleon.
Author
Nuclear Reactions; Cosmic Rays; Antiprotons; Particle Interactions; Mathematical Models; Astronomical Models
20030033899 Aristotle Univ. of Thessaloniki, Greece
Pulse Shaping for Localized Magnetic Resonance Tagging
Ikonomidou, V. N.; Sergiadis, G. D.; October 25, 2001; 5 pp.; In English
Report No.(s): AD-A410475; No Copyright; Avail: CASI; A01, Hardcopy
Magnetic resonance tagging is usually achieved by means of a train of non-selective radio-frequency pulses separated by
gradient pulses. Thus, the modulation of the M(sub z) magnetization component expands all over the imaging plane. It has
been proposed that the use of selective excitation pulses may limit the modulation only to regions of interest, thus preserving
anatomical data in the rest of the image. In this paper, we intend to expand the tagging k-space concept in order to account
for pulse selectivity, and offer a prediction and design tool for localized MR tagging sequences.
DTIC
Magnetic Resonance; Pulses
20030033936 Lawrence Livermore National Lab., Livermore, CA
Electron, Photon, and Ion Beams from the Relativistic Interaction of Petawatt Laser Pulses with Solid Targets
Hatchett, S. P.; Brown, C. G.; Cowan, T. E.; Henry, E. A.; Johnson, J.; Nov. 12, 1999; In English
Report No.(s): DE2002-790963; UCRL-JC-135029; No Copyright; Avail: National Technical Information Service (NTIS)
We have studied, in some detail, the x-ray emission from solid, thick (approximately 1 mm) Au targets illuminated by the
Petawatt laser. We report here on the characteristics of the bremsstrahlung and what it reveals about the hot electron flow
within the target. In the process of attempting to observe relativistic (hereafter hot) electron emission from solid, thin (50-125
micrometer) Au and plastic (CH) targets we discovered extraordinarily luminous beams of ions from the backs of these targets.
We discuss below the characteristics of the ion beams and our ideas on the mechanism generating them.
NTIS
Bremsstrahlung; Ion Beams; Pulsed Lasers; Targets
20030034687 Duke Univ., Durham, NC, USA
Evaluation of a Recoil-Escape Fiber Target Using 94Mo(p,n)94mTc to Produce 94TcO4- Precursor for Radiolabeled
Compounds Useful in Positron Emission Tomography
Illan, C. D.; Wieland, B. W.; Oct 2001; 5 pp.; In English
Report No.(s): AD-A410506; No Copyright; Avail: CASI; A01, Hardcopy
A variety of compounds radiolabeled with 99mTc(140 keV gamma T(sub 1/2)=6 hours) are widely used in nuclear
medicine imaging. These compounds can also be radiolabeled using positron-emitting precursor 94mTcO4 (T(sub 1/2)=53
minutes) and used with Positron Emission Tomography (PET) to measure tissue concentrations in mu Ci/cm3, and produce
kinetic data useful to understand the mechanism of drug action. This work-in-progress evaluates a novel accelerator target for
producing 94mTc. Positron emitters have been produced with fiber targets, using the principle of recoil escape in which the
target atoms are in a solid form, while recovering the product radionuclide ion by stopping it in a liquid or a gas. The recoil
ion is transported out of the target, leaving the remaining target material to be used repeatedly in subsequent production runs.
Our proposed target is based on this method.
DTIC
Technetium; Positrons; Tomography
20030036907 Lawrence Livermore National Lab., Livermore, CA
Target Design Activities for Inertial Fusion Energy at Lawrence Livermore Laboratory
Tabak, M.; Callahan-Miller, D.; Herrmann, M.; Hatchett, S.; Lindl, J. D.; Sep. 19, 2000; 16 pp.; In English
Report No.(s): DE2002-792755; UCRL-ID-137692; No Copyright; Avail: Department of Energy Information Bridge
We studied a variety of targets to be driven by ion beams or lasers in the past year. In order to relax target fabrication
requirements, expand the allowed beam phase space volume and meet some radiological safety requirements, we continued
to extend the set of the distributed radiator target designs for heavy ion beams. The hydrodynamic stability of a high gain
directly driven laser target recently proposed at the Naval Research Laboratory has been studied. Because target chambers are
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