[en] This report documents the ITI/EPRI prediction of Standard Problem 10 for submittal to the United States Nuclear Regulatory Commission. The analysis and submittal were completed prior to NRC's release of test data. The RETRAN computer code and state-of-the-art models were used to analyze the first 20 seconds of LOFT Test L2-3 which was a 200% cold leg break blowdown of a nuclear heated core at a nominal power of 36.7 MW. The experimental data were added to this report after submittal of the prediction and are shown in overlay comparison plots with the RETRAN prediction parameters

[en] The program LIFETIME is designed to extract lifetimes of nuclear levels from Doppler-shift recoil-distance experiments by performing a least-square fit to the experimental data (shifted and unshifted photopeak intensities and branching ratios). Initial populations of levels and transition rates between levels are treated as variable parameters. In terms of these parameters the population of each level as a function of time is determined by the Bateman equations, and the shifted and unshifted intensities are calculated. 19 refs., 5 figs

No abstract available

[en] Muons bound to actinide nuclei may induce prompt nuclear fission. Following atomic muon capture, some of the inner-shell atomic transitions proceed by inverse internal conversion, i.e. the atomic transition energy is transferred to the nucleus resulting in excitation of giant multipole resonces which exhibit a large fission width. The muon is not annihilated in this process and may be used to study the viscosity of nuclear matter during fission. We study the time-development of the muonic wavefunction by solving the Dirac equation on a 3-D cartesian lattice using the B-Spline collocation method. The muon attachment probability to the light fission fragment is sensitive to the nuclear energy dissipation between the outer fission barrier and the scission point. We compare our theoretical results for 237-Np and 238-U to experimental data measured at the Paul Scherrer Institute

[en] The results are presented of a comparison between analytical predictions of the first LOFT nuclear test (L2-2) and subsequent test results. The test prediction was made with the RETRAN thermal hydraulic computer code. LOFT test L2-2 was a full area, double-ended, cold leg break simulation, with the core operating at 24.88 MW (maximum linear heat generation of 26.37 kW/M). The validity and usefulness (for comparison with analysis) of the experimental results as reported by EG and G Idaho, Inc., are also reviewed

[en] The new colliding-beam heavy-ion accelerators, designed to investigate nuclear matter at high temperatures and densities, have motivated great interest during the last decade concerning possible new electromagnetic phenomena. One of the most interesting of these processes is the sparking of the vacuum to produce lepton-antilepton pairs. The process of electron capture from vacuum pair production is a principal beam-loss mechanism for highly charged relativistic ions in a storage ring, and thus must be considered in the design and the operation of these machines. In this paper, the author presents calculated impact-parameter-dependent probabilities and cross sections for muon capture from vacuum production in collisions of relativistic heavy ions by solving the time-dependent Dirac equation in unrestricted three-dimensional space using lattice-collocation techniques. Calculations are performed for muon-pair production with capture into the K-shell in collisions of ¹⁹⁷Au + ¹⁹⁷Au at collider kinetic energies of 2 GeV per nucleon

[en] Absolute cross sections for reaction products in the 38.5 to 51.0 MeV ¹⁶O bombardment of ⁶⁵Cu are reported. Gamma spectroscopy was used to identify the products. Results are compared with predictions for the statistical decay from compound nuclei. (3 figures) (U.S.)

No abstract available

[en] The energy levels in ¹⁴⁴Nd have been investigated in detail via the ¹⁴³Nd(n,γ) reaction with thermal and resonance neutrons. In thermal measurements, about 500 gamma rays in the 0.1 to 6.5 MeV region have been identified. The resonance measurements were able to distinguish many gamma rays which were questionable in the thermal studies. (n,γ) reactions with ¹¹⁸Sn, ¹²⁰Sn, and ¹²²Sn have also been investigated, and the ¹²¹Sn level scheme is presented. (2 figures) (U.S.)

[en] This report presents the results of a comparison between analytical predictions of four non-nuclear LOFT tests and the subsequent test results. The test predictions were made with the RELAP thermal hydraulic computer code. The LOFT tests included L1-1, L1-2, L1-3A, and L1-4, all of which were non-nuclear blowdown tests conducted with a core simulator in the reactor vessel. The validity and usefulness (for comparison with analysis) of the experimental results as reported by EG and G Idaho are also reviewed