115852412
Y* Production in Sigma--Nucleus Reactions
121791568
A Study of K+ d Elastic Scattering in the Region of 600-MeV/c to 900-MeV/c
Measurements of the differential cross section for the coherent elastic scattering process ${K}^{+}d\ensuremath{\rightarrow}{K}^{+}d$ are presented at four momenta from 600 MeV/c to 890 MeV/c for $0.03l|t|l0.25$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$. Comparisons are made with previous work and with predictions from partial-wave analyses.
122920202
Phi Factory Detector Requirements
122547006
MEASUREMENT OF THE LOCAL PRODUCTION OF MUONS UNDERGROUND.
39080260
Modified soft annihilation model of anomalous dilepton and photon production and its comparison with data.
The soft annihilation model of the production of anomalous prompt photons and dileptons in multiparticle production processes is modified by the inclusion of a gluon component in the intermediate parton state, improving the agreement with data.
1196260
Fast, long-wavelength scintillators and waveshifters
Studies are presented of new blue-green to red emitting scintillator and waveshifter materials for tracking and calorimetry applications for the detection of ionizing radiation. Materials include plastic scintillators, liquid scintillators, and plastic scintillating and waveshifting fibers. Program goals are to develop faster and more efficient detection media for a variety of experimental applications
42616403
Fission fragment mass and energy distributions as a function of incident neutron energy measured in a lead slowing-down spectrometer
A new method of measuring fission fragment mass and energy distributions as a function of incident neutron energy in the range from below 0.1 eV to 1 keV has been developed. The method involves placing a double-sided Frisch-gridded fission chamber in Rensselaer Polytechnic Institute's lead slowing-down spectrometer (LSDS). The high neutron flux of the LSDS allows for the measurement of the energy-dependent, neutron-induced fission cross sections simultaneously with the mass and kinetic energy of the fission fragments of various small samples. The samples may be isotopes that are not available in large quantities (submicrograms) or with small fission cross sections (microbarns). The fission chamber consists of two anodes shielded by Frisch grids on either side of a single cathode. The sample is located in the center of the cathode and is made by depositing small amounts of actinides on very thin films. The chamber was successfully tested and calibrated using 0.41+-0.04 ng of {sup 252}Cf and the resulting mass distributions were compared to those of previous work. As a proof of concept, the chamber was placed in the LSDS to measure the neutron-induced fission cross section and fragment mass and energy distributions of 25.3+-0.5 mug of {sup 235}U. Changes inmore » the mass distributions as a function of incident neutron energy are evident and are examined using the multimodal fission mode model.« less
119347300
K+ -> pi+ mu+ mu- in E865 at BNL
Preliminary values for the K+ -> pi+ mu+ mu- branching ratio and form factor are reported, based on 400 events, a factor of 2 more in total events and 100 times the present world sample of fully reconstructed events. The results are consistent with previous results on the pi+ e+ e- mode. However, the relatively large slope of the form factor in q^2, lambda = 0.182+/-0.01+/-0.007, required to fit the pi+ e+ e- data and to give consistency between the pi+ e+ e- and pi+ mu+ mu- branching ratios, is larger than expected in simple models of the decays. The K+ -> pi+ mu+ mu- branching ratio we find, (9.23 +/- 0.6 stat +/- 0.58 syst)x10^-8, is the most precise measurement of this mode and is approximately 3.2 sigma larger than the previous measurement. These pi+ l+ l- results are inconsistent with O(p^4) Chiral Perturbation Theory but compatible with O(p^6). Systematic studies for both modes are still in progress.