29 research outputs found
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Progress report on research in nuclear physics, August 1, 1994--June 30, 1995
The progress on Grant No. DE-FG05-87ER40314 from August 1, 1994 to June 30, 1995, is summarized in this report. The activities for the past year were focused on the rare electron capture studies, using experimental facilities at Tennessee Technological University and Montana State University. Also discussed are the PC-based multiparameter data acquisition systems and the two-dimensional position-sensitive microchannel plate detector
4He decay of excited states in 14C
A study of the 7Li(9Be,4He 10Be)2H reaction at E{beam}=70 MeV has been
performed using resonant particle spectroscopy techniques and provides the
first measurements of alpha-decaying states in 14C. Excited states are observed
at 14.7, 15.5, 16.4, 18.5, 19.8, 20.6, 21.4, 22.4 and 24.0 MeV. The
experimental technique was able to resolve decays to the various particle bound
states in 10Be, and provides evidence for the preferential decay of the high
energy excited states into states in 10Be at ~6 MeV. The decay processes are
used to indicate the possible cluster structure of the 14C excited states.Comment: accepted for publication in PR
Electromagnetic transitions in neutron-rich Cl40
In-beam -rays from excited states of the neutron-rich (Tz=3) nucleus Cl40 have been identified in a threefold coincidence experiment in which rays and light charged particles were observed. The resulting decay scheme is presented, and implications for the structure of low-lying levels in Cl40 are discussed in light of recent data from charge-exchange and -decay work. The ordering of levels would seem to be quite different from the predictions of recent shell-model calculations
Yrast decays in K43
High-spin states in K43 were studied using the Be9(36S,pn)43K reaction. Threefold (p12) coincidence data and -ray intensity ratios were used to establish a decay scheme and identify negative- and positive-parity yrast decay chains. The 15/2- yrast state is relatively poorly aligned prior to decay. Energies of positive-parity levels predicted by Johnstone are in good agreement with experiment
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Research in nuclear physics
This report discusses the following topics: electron capture decay of {sup 179}Ta; search for 17-keV neutrinos in the Internal Bremsstrahlung Spectrum of {sup 125}I; and {beta}{sup +} decay and cosmic-ray half-life of {sup 91}Nb
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Radioisotope yields from 1.85-GeV protons on Mo and 1.85- and 5.0-GeV protons on Te
Radioisotope yields from 1.85-GeV proton interactions in a natural isotopic composition Mo target and those from 1.85- and 5.0-GeV protons in natural Te targets were measured at Lawrence Berkeley Laboratory`s Bevatron. The radioisotope yields were determined by {gamma}-counting the targets using a 100-cm{sup 3} coaxial Ge detector following the irradiations. Cross sections were determined for the production of 31 radioactive nuclides, ranging from Z = 35, A = 74, to Z = 43, A = 97, from the Mo target and for 47 radioactive nuclides, ranging from Z = 35, A = 75, to Z = 53, A = 130 from the Te targets
Conceptual Design of a Personal Aerial Vehicle Using Co- Flow Jet Airfoil
A flying wing personal aerial vehicle (PAV) is designed using a co-flow jet airfoil (CFJ); it is designed to take-off and land on regular roads and highways, at take-off speed of 60mph. The advantages of using CFJ throughout the entire PAV are the enhanced lift/stall margin and thrust generation. It has a targeted range of 500miles, at a cruise mach number of 0.3 at an altitude of 10,000ft with a payload of 3 passengers. The aspect ratio achieved is 2.5 with the addition of an elliptical wing to increase the wing span of the PAV. The mass flow of the jet that covers the surface of the wings needed is of 19kg/s, requiring a power of 684hp (510kW) to pump the jets to such mass flow rate. Given these conditions, the CFD analysis is still in progress. Nomenclature AR = aspect ratio b = wing span s = wing area PR = total pressure ratio m & = mass flow rate U = velocity V = velocity C m = momentum coefficient Ï = density Îł = ratio of specific heats I
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Evidence for the Emission of a 17-keV Neutrino in the {beta} Decay of {sup 14}C
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