61 research outputs found
E1 transitions between spin-dipole and Gamow-Teller giant resonances
The branching ratios for E1 transitions between the spin-dipole (SD) and
Gamow-Teller (GT) giant resonances in Nb and Pb are evaluated.
Assuming the main GT-state has the wave function close to that for the "ideal"
GT-state, we reduced the problem to calculate the SD and GT strength functions.
These strength functions are evaluated within an extended continuum-RPA
approach.Comment: 8 pages, submitted to Phys. Rev.
Inelastic Proton Scattering to M_1 States in 12-C, 24-Mg, and 28-Si at 62 MeV
This work was supported by National Science Foundation Grants PHY 76-84033A01, PHY 78-22774, and Indiana Universit
Splitting of the Dipole and Spin-Dipole Resonances
Cross sections for the 90,92,94Zr(p,n) reactions were measured at energies of
79.2 and 119.4 MeV. A phenomenological model was developed to describe the
variation with bombarding energy of the position of the L=1 peak observed in
these and other (p,n) reactions. The model yields the splitting between the
giant dipole and giant spin dipole resonances. Values of these splittings are
obtained for isotopes of Zr and Sn and for 208Pb.Comment: 14 pages, 4 figure
Neutron Matter Distributions from Quasi-Elastic (p,n) Reactions
Supported by the National Science Foundation and Indiana Universit
The Isospin Makeup of the Giant Resonances from (p,n) Reaction Studies at Intermediate Energies
This work was supported by National Science Foundation Grant PHY 75-00289 and Indiana Universit
(p,n) Experiments at IUCF
This work was supported by National Science Foundation Grants PHY 76-84033A01, PHY 78-22774, and Indiana Universit
Do Hadronic Charge Exchange Reactions Measure Electroweak L = 1 Strength?
An eikonal model has been used to assess the relationship between calculated
strengths for first forbidden beta decay and calculated cross sections for
(p,n) charge exchange reactions. It is found that these are proportional for
strong transitions, suggesting that hadronic charge exchange reactions may be
useful in determining the spin-dipole matrix elements for astrophysically
interesting leptonic transitions.Comment: 14 pages, 5 figures, Submitted to Physical Review
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Isospin dependent terms in the N-N force at low q from (p,n) reactions. [/sup 26/Mg(p,n)/sup 26/Al, 80 and 120 MeV: neutron spectra, angular dist]
The /sup 26/Mg(p,n)/sup 26/Al reaction to resolved final states is used to select out a spin-isospin component and an isospin component in the effective nucleon-nucleus interaction and to compare the strengths of these components at different energies. It is found that (V/sub sigma tau//V/sub tau/)/sup 2/ = 1.7 at 80 MeV and 4.6 at 120 MeV. 5 figures
Structural Analysis of the QCM Aboard the ER-2
As a result of recent supersonic transport (SST) studies on the effect they may have on the atmosphere, several experiments have been proposed to capture and evaluate samples of the stratosphere where SST's travel. One means to achieve this is to utilize the quartz crystal microbalance (QCM) installed aboard the ER-2, formerly the U-2 reconnaissance aircraft. The QCM is a cascade impactor designed to perform in-situ, real-time measurements of aerosols and chemical vapors at an altitude of 60,000 - 70,000 feet. The ER-2 is primarily used by NASA for Earth resources to test new sensor systems before they are placed aboard satellites. One of the main reasons the ER-2 is used for this flight experiment is its capability to fly approximately twelve miles above sea level (can reach an altitude of 78,000 feet). Because the ER-2 operates at such a high altitude, it is of special interest to scientists interested in space exploration or supersonic aircraft. Some of the experiments are designed to extract data from the atmosphere around the ER-2. For the current flight experiment, the QCM is housed in a frame that is connected to an outer pod that is attached to the fuselage of the ER-2. Due to the location of the QCM within the housing frame and the location of the pod on the ER-2, the pod and its contents are subject to structural loads. In addition to structural loads, structural vibrations are also of importance because the QCM is a frequency induced instrument. Therefore, a structural analysis of the instrument within the frame is imperative to determine if resonance and/or undesirable deformations occur
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