17 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "nuclei"  
Results: 1 - 17
open access

ICF tritium production reactor

Description: The conceptual design of an ICF tritium production reactor is described. The chamber design uses a beryllium multiplier and a liquid lithium breeder to achieve a tritium breeding ratio of 2.08. The annual net tritium production of this 532 MW/sub t/ plant is 16.9 kg, and the estimated cost of tritium is $8100/g.
Date: February 28, 1985
Creator: Meier, W. R.; McCarville, T. J.; Berwald, D. H.; Gordon, J. D. & Steele, W. G.
Partner: UNT Libraries Government Documents Department
open access

Nucleonics of a Be-Li-Th blanket for the fusion breeder

Description: The nuclear performance of a candidate fission-suppressed, U233-producing blanket is assessed. It is predicted to have a breeding ratio (fusile + fissile) of 1.68 and produce U233 at a rate of 8030 kg/year from 3140 MW of DT fusion and a blanket coverage of 96%. Blanket energy multiplication is estimated to vary between 1.3 and 2.0 as the U233/Th232 ratio varies between 0 and 0.5%. Heterogeneous effects in the blanket's pebble-bed configuration were found to be important and more detailed analy… more
Date: March 28, 1983
Creator: Lee, J. D.
Partner: UNT Libraries Government Documents Department
open access

Entry State Distributions of Discrete Yrast Transitions in Heavy Ion Induced Fusion Reactions

Description: Gamma rays emitted during yrast transitions from compound nuclei are detected with a 4..pi.. multielement gamma ray detector system. Both total pulse height (H) and coincidence fold data (k) are obtained for each event. Results presented include entry state distribution states, k and H projections for some of these distributions, and k and H as a function of spin of the yrast transition. 5 figs. (DWL)
Date: May 28, 1985
Creator: Lee, I. Y.; Baktash, C.; Beene, J. R.; Fewell, M. P.; Halbert, M. L.; Johnson, N. R. et al.
Partner: UNT Libraries Government Documents Department
open access

The cascade ICF reactor with an x-ray and debris shield and a heavy-ion driver

Description: The use of a 1-kg solid-lithium x-ray and debris shield around each fusion fuel pellet prevents vaporization of, and destructive shock waves in, the Cascade blanket granules thereby increasing their lifetime. The shield vaporizes as it absorbs energy and the vapor flows into the blanket several centimeters. The shield also increases tritium breeding and enhances vacuum pumping of high Z materials that are vaporized in the fuel pellet. Using heavy ion beams allows illumination of the fuel pellet… more
Date: September 28, 1990
Creator: Pitts, John H. & Tabak, Max
Partner: UNT Libraries Government Documents Department
open access

Experimental prospects for the synthesis and detection of superheavy elements

Description: Schemes that could be used for detection of superheavy elements (SHE) are briefly discussed first. The question of producing SHE in other than complete fusion reactions (e.g., in deep inelastic reactions) is addressed at greater length. Production cross sections are estimated. A heavy ion lens spectrometer for the detection of reaction products is described. 18 figures, 3 tables. (RWR)
Date: March 28, 1978
Creator: Nitschke, J.M.
Partner: UNT Libraries Government Documents Department
open access

/sup 163/Dy as a solar neutrino detector

Description: The possibility of using /sup 163/Dy as a low threshold solar neutrino detector is discussed. Solar neutrino absorption cross sections are calculated, and expected capture rates presented.
Date: November 28, 1984
Creator: Bennett, C. L.
Partner: UNT Libraries Government Documents Department
open access

Debris collection from implosion of microballoons

Description: Recovery of krypton from implosion of glass microballoons has been studied in the development of a radiochemical diagnostic for determination of <rho r> /sub fuel/. Collection onto metal surfaces following implosions performed on the OMEGA laser with 1-3 TW (1-2 kJ) of 0.35 ..mu..m light is consistent with an ion implantation mechanism. The dependence of the intrinsic collection efficiency on the energy fluence to the collector surface and its variation in implosions carried out under the same … more
Date: March 28, 1986
Creator: Prussin, S.G.; Lane, S.M.; Richardson, M.C. & Noyes, S.G.
Partner: UNT Libraries Government Documents Department
open access

The Gamma-ray Albedo of the Moon

Description: We use the GEANT4 Monte Carlo framework to calculate the {gamma}-ray albedo of the Moon due to interactions of cosmic ray (CR) nuclei with moon rock. Our calculation of the albedo spectrum agrees with the EGRET data. We show that the spectrum of {gamma}-rays from the Moon is very steep with an effective cutoff around 3-4 GeV (600 MeV for the inner part of the Moon disk) and exhibits a narrow pion-decay line at 67.5 MeV, perhaps unique in astrophysics. Apart from other astrophysical sources, the… more
Date: September 28, 2007
Creator: Moskalenko, Igor V.; /Stanford U., HEPL; Porter, Troy A. & /UC, Santa Cruz
Partner: UNT Libraries Government Documents Department
open access

Production of beams of neutron-rich nuclei between Ca and Ni using the ion-guide technique

Description: Since several elements between Z = 20-28 are refractory in their nature, their neutron-rich isotopes are rarely available as low energy Radioactive Ion Beams (RIB) in ordinary Isotope Separator On-Line facilities [1-4]. These low energy RIBs would be especially interesting to have available under conditions which allow high-resolution beta-decay spectroscopy, ion-trapping and laser-spectroscopy. As an example, availability of these beams would open a way for research which could produce interes… more
Date: September 28, 2004
Creator: Perajarvi, K.; Cerny, J.; Hager, U.; Hakala, J.; Huikari, J.; Jokinen, A. et al.
Partner: UNT Libraries Government Documents Department
open access

Hartree-Fock Mean-Field Models Using Separable Interactions

Description: An effective two-body nuclear interaction is presented which is a sum of terms separable in coordinate space. Calculations are made using this interaction of some doubly closed-shell spherical nuclei using many-body perturbation theory with the Hartree-Fock state as a reference state. It is demonstrated that the interaction gives good bulk properties in finite nuclei.
Date: June 28, 1999
Creator: Stevenson, P.; Stone, J. R. & Strayer, M. R.
Partner: UNT Libraries Government Documents Department
open access

Radiative Strength Functions and Level Densities

Description: Radiative strength functions and level densities have been extracted from primary {gamma}-ray spectra for {sup 27,28}Si, {sup 56,57}Fe, {sup 96,97}Mo, and several rare earth nuclei. An unexpectedly strong ({approx} 1 mb MeV) resonance at 3 MeV in the radiative strength function has been observed for well-deformed rare earth nuclei. The physical origin of this resonance and its connection to the scissors mode is discussed.
Date: August 28, 2002
Creator: Schiller, A.; Becker, J. A.; Bernstein, L. A.; Voinov, A.; Guttormsen, M.; Hjorth-Jensen, M. et al.
Partner: UNT Libraries Government Documents Department
open access

Radiographic x-ray flux monitoring during explosive experiments by copper activation

Description: During radiographic experiments involving explosives, it is valuable to have a method of monitoring the x-ray flux ratio between the dynamic experiment and an x-ray taken of a static object for comparison. The standard method of monitoring with thermoluminescent detectors suffers the disadvantages of being sensitive to temperature, shock, uv radiation, cleanliness and saturation. A flux monitoring system is being studied which is not subject to any of the above disadvantages and is based upon t… more
Date: January 28, 1986
Creator: Goosman, David R.
Partner: UNT Libraries Government Documents Department
open access

A new one-detector analysis method for rapid high precision plutonium isotopic measurements

Description: A new method has been developed that achieves plutonium isotopic analysis precisions of better than 2% in counting times of only a few minutes, using only the 59- to 208-keV energy region of a spectrum. This breakthrough was achieved by developing a unique but highly accurate method for delineating the overall ''intrinsic'' efficiency curve, including the plutonium K-shell absorption discontinuity at 121 keV. Consequently, the measured 129- and 148-keV peak intensities can now be used to reliab… more
Date: October 28, 1986
Creator: Gunnink, R.
Partner: UNT Libraries Government Documents Department
open access

Application of the Extended Pairing Model to Heavy Isotopes

Description: The binding energies of three isotopic chains ({sup 100-130}Sn, {sup 152-181}Yb, and {sup 181-202}Pb) are studied using the extended pairing model. By using the exact solvability of the model one determines the pairing strength G(A) that reproduces the experimental binding energies. For these isotopic chains, log (G(A)) has a smooth systematic behavior. In particular, G(A) for the Pb and Sn isotopes can be described by a two parameter expression that is inversely proportional to the dimensional… more
Date: September 28, 2004
Creator: Gueorguiev, V G; Pan, F & Draayer, J P
Partner: UNT Libraries Government Documents Department
open access

Excitation of a quantal and a classical gas in a time-dependent potential

Description: We report on computer simulations of oscillating Woods-Saxon or cavity potentials filled with either a classical or a quantal gas of independent particles. We have now available of the order of 600 excitation histories of such gases undergoing usually one period of oscillation (but sometimes several), classified according to frequency and multipolarity of the oscillation and of the degree of diffuseness of the potential. We are still in the process of displaying and interpreting some of the res… more
Date: September 28, 1994
Creator: Blocki, J.; Brut, F.; Skalski, J. & Swiatecki, W. J.
Partner: UNT Libraries Government Documents Department
open access

The Core of NGC 6240 from Keck Adaptive Optics and HST NICMOS Observations

Description: We present results of near infrared imaging of the disk-galaxy-merger NGC 6240 using adaptive optics on the Keck II Telescope and reprocessed archival data from NICMOS on the Hubble Space Telescope. Both the North and South nuclei of NGC 6240 are clearly elongated, with considerable sub-structure within each nucleus. In K' band there are at least two point-sources within the North nucleus; we tentatively identify the south-western point-source within the North nucleus as the position of one of … more
Date: June 28, 2004
Creator: Max, C. E.; Canalizo, G.; Macintosh, B. A.; Raschke, L.; Whysong, D.; Antonucci, R. et al.
Partner: UNT Libraries Government Documents Department
open access

Recent searches for superheavy elements at the superhilac. [Cross section limits for Z = 110 to 118]

Description: The results of the search for superheavy elements are negative with respect to the finding of such elements. However, by assuming 2 spontaneous fission events as the lower limit of detection, the limits to their formation cross sections are calculated and plotted. It is noted that the half-life limits, also shown are easily within the huge uncertainties of the theoretical predicted half lives for any superheavy element nuclides produced in the experiment. 19 references. (JFP)
Date: March 28, 1978
Creator: Hulet, E. K.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen