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

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

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

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 ρ = density γ = ratio of specific heats I