FIFTY-FIFTH PROGRESS REPORT THROUGH OCTOBER 31, 1959
6 7 D J > 8 7 9 8 7 < 9 9 ported on certain aspects of flame photometry, photometric titrations in nonaqueous media, coulometric generation of sulfhydryl reagents and fused salt electrochemistry. Continuing progress is also reported in studies on lower valence states of indium, polarography of silver and mercury complexes, thermometric titrations, irreversible electrode processes, and absorption and luminescence spectra of chelates in gas chromatography. New studies include work on multi-electron electrode reactions, nonaqueous polaography of metals, electrolytic and foam chromatography. Nuclear Chemistry (Inorganic) Group. Research efforts are reported on physico-chemical studies of ion-exchange and solvent extraction systems, and nuclear chemical studies of the fission process and charged particle reactions. Nuclear Chemistry (Organic) Group. Research is reported on mechanism of substitution of triphenylmethyl halides in benzene. Data on dimerization of acetic acid in benzene and on the complexing constant between acetic acid and tertiary amine in benzene at 25 deg C are tabulated. The solubilities of methyl halides in water and D/sub 2/O at 29.4 and 40.3 deg were measured. Methyl chloride and methyl bromide were also studied at 49.6 deg C. Results are presented tabularly. Other research waa conducted on the mechanism of the Cannizzaro reaction, methyl halide ground and transition states in water solution, acid catalysis of methyl fluoride hydrolysis, displacement mechanism in silicon compounds, and selectivity in carbene reaction. Cosmic Ray Group. Activities reported include operation details of the high counting rate meson monitor, large air shower experiments, and polarization of cosmic ray mu-mesons. Discussions of activities of high-energy gamma-ray experiments are also included along with a description of work on plasma probes. High Energy Accelerator Physics Group. An experiment is reported to measure the photo-production of neutral pi-mesons from complex nuclei by 250 Mev gamma rays at forward angles. Data are included on the angular distribution of neutral mesons from calcium, carbon, and lead. Other activities are reported on a study of pi -capture in complex nuclei, sirgle quantam annihilation of positrons, search for a neutral spin one meson in the pi mass range, and development of a method of analyzing the angular distributions and polarization of high energy protons. Bubble Chamber Group. Installation and operation of the 15-inch methyl iodide chamber and 20,000 gauss magnet are reported. Effort was also directed toward designing and building hardware to mount a 9-inch propane chamber inside the magnet with which it will be used. Linear Accelerator Group. Measurements of the cross sections involved in the photodisintegration of Be/sup 9/ at 2.5 to 17 Mev were completed. Data on the reaction processes are included. In other work, neutron spectra at 115 degrees from 17.0 Mev bremsstrahlung were measured for lithium, nitrogen, and fluorine, and from 17.55 Mev bremsstrahlung for oxygen. Rockefeller Generator Group. Preliminary trials with the pulsed generator include generator loading, ion source modulation, measurement of burst duration, and lifetime measurements of Sm/sup 154/ first excited state. Other activities include generator modifications, and preparation of experimental equipment. ONR Generator Group. Data taken during the period included those on energy levels of silicon isotopes from inelastic protonscattering. Various other nuclear reactions such as O/sup 16/(p, alpha )N/sup 13/, Si/sup 30/(p, alpha )Al/sup 27/, and Co/sup 59/(d,p)Co/su p 60/ were studied, and selenium energy levels were investigated. Data on the levels of Ne/sup 21/ and Ne/sup 23/ are also included along with those of F/sup 18/. Radioactivity Group. Coincidence experiments for measurirg nuclear gyromagnetic ratios demonstrated a scheme of measurement which appears to be the most con
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge. Lab. for Nuclear Science
- DOE Contract Number:
- AT(30-1)-2098; NASW-37; NASW-75; AND AT(30-1)-905
- NSA Number:
- NSA-14-014613
- OSTI ID:
- 4140910
- Report Number(s):
- TID-5766
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- United States
- Language:
- English
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PROGRESS REPORT NO. 53: FOR PHYSICS, JUNE 1, 1958 THROUGH AUGUST 31, 1958 AND FOR CHEMISTRY, JUNE 1, 1958 THROUGH OCTOBER 31, 1958
PROGRESS REPORT NO. 51 FOR THE PERIOD SEPTEMBER 1, 1957 THROUGH NOVEMBER 30, 1957
Related Subjects
ACCELERATORS- ANGULAR DISTRIBUTION- BEAMS- CALCIUM- CARBON- ENERGY RANGE- LEAD- MEASURED VALUES- MEV RANGE- NUCLEI- PHOTONS- PHOTOPRODUCTION- PIONS- TARGETS
ACCELERATORS- ENERGY LEVELS- EXCITATION- HALF-LIFE- ION SOURCES- MEASURED VALUES- MODULATION- PULSES- REACTOR FUELING- SAMARIUM 154
ACCELERATORS- ENERGY LEVELS- FLUORINE 18- INELASTIC SCATTERING- MEASURED VALUES- NEON 21- NEON 23- PROTON BEAMS- SCATTERING- SELENIUM- SILICON ISOTOPES
ALPHA BEAMS- CYCLOTRONS- EMISSION- GAMMA RADIATION- INELASTIC SCATTERING- - MEASURED VALUES- SCATTERING
ALPHA PARTICLES- ALUMINUM 27- NUCLEAR REACTIONS- PROTON BEAMS