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PROGRESS REPORT FOR JANUARY, FEBRUARY, MARCH 1960 TO THE UNITED STATES ATOMIC ENERGY COMMISSION

Technical Report ·
OSTI ID:4131516
Sixty-one resonances in I/sup 127/ wereanalyzed up to an energy of 815 ev. In addition to the neutron width, 18 values of radiation width were obtained. The new proton beam deflection circuitry was successfully tested. A fast neutron scintillation counter, which employs pulse-shape analysis for gamma rejection, is being tested. The associated circuitry, having a gamma lead time of 0.4 to 0.5 mu sec, was developed. Measurements with the neutron spectrometer are described. Internal conversion electrons from the second excited state of CA/sup 42/ were observed in a magnetic spectrometer by proton inelastic scattering. Studies of F/sup 19/(He/sup 3/,d) and Li/sup 7/(He/sup 3/ d) at 3.5 Mev showed th at no new states appeared in Be/sup 8/ in the energy gap of escitation 3 to 12 Mev, and that the intensity distribution of the d-spectrum from Fe/sup 19/(He/sup 3/,d) is quite different from that of the n-spectrum leading to the same states in the Fe/sup 19/(d,n) reaction. The charge exchange reaction using (He/sup 3/,T) on mirror nuclei Be/sup 9/ and Li/sup 7/ was investigated. A beam pipe assembly that consists of a strong focusing electrostatic lens, diffusion pump, and gas target was constructed and tested. The lifetime of the first excited state of Hg/sup 138/ was measured using the double coincidence beta spectrometer. The anisotropy of the angular correlation between the 0.3 and 1.5 Mev gamma -rays of Ca/sup 42/ was investigated. A variable speed turntable assembly for preliminary Mossbauer effect studies was designed and constructed. A positioning unit for controlling the azimuth of a detector in a gamma - gamma angular correlation arrangement was designed. Development of a low-noise preamplifier is discussed. The ten-channel time-of- flight analyzer was completed after several modifications. A fast coincidence circuit was constructed snd tested. (For preceding period see CU(PNPL-202.) (W.D.M.)
Research Organization:
Columbia Univ., New York. Pegram Nuclear Physics Labs.
NSA Number:
NSA-14-026030
OSTI ID:
4131516
Report Number(s):
CU(PNPL)-203
Country of Publication:
United States
Language:
English

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Related Subjects

AMPLIFIERS-- BACKGROUND-- COINCIDENCE METHODS-- PLANNING
ANGULAR DISTRIBUTION-- ANISOTROPY-- CALCIUM 42-- COINCIDENCE METHODS-- GAMMA RADIATION-- PLANNING
ANGULAR DISTRIBUTION-- COINCIDENCE METHODS-- CONTROL-- DETECTION-- GAMMA RADIATION-- PLANNING
BEAMS-- COINCIDENCE METHODS-- DIFFUSION-- ELECTROSTATICS-- GASES-- LENSES-- PIPES-- PLANNING-- PUMPS-- TARGETS-- TESTING
BERYLLIUM 8-- COINCIDENCE METHODS-- DEUTERONS- - DISTRIBUTION-- ENERGY LEVELS-- ENERGY RANGE-- FLUORINE 19-- HELIUM 3-- ION BEAMS-- LITHIUM 7-- NEUTRONS-- NUCLEAR REACTIONS-- PLANNING-- SPECTRA
CALCIUM 42-- COINCIDENCE METHODS-- ELECTRONS-- ENERGY LEVELS-- INELASTIC SCATTERI
PHYSICS