ALPHA-GAMMA ANGULAR CORRELATION MEASUREMENTS WITH LIQUID SOURCES
Alpha-gamma angular correlation measurements were made with solid sources of Am/sup 243/ and with liquid sources containing either Am/sup 243/ or an even-even alpha emitter in dilute perchloric acid solutions. Even-even alpha emitters studied are U/sup 232/, Th/sup 230/, and Ra/sup 226/ . Thicknesses of the soli d sources were controlled so that the neptunium recoils from one source were stopped in Am/sub 2/O/sub 3/, while recoils from the other sources were stopped in the aluminum, gold, or mica backing on which the sources were vaporized. The liquid sources were films consisting of 3 microliters of solution placed between a rubber hydrochloride membrane and a microscope cover glass, 1 cm/sup 2/ in circular cross section. The perchloric acid concentration of the liquid sources ranged from 0.5 to 3.0 molar. All of the angular correlations obtained with solid Am/sup 243/ sources were attenuated, the average attenuation coefficients being 0.29 450 deg C in a 0.01 for sources in which recoils were stopped in Am/sub 2/O/sub 3/, 0.20 450 deg C in a 0.01 for sources in which recoils were stopped in mica, 0.52 450 deg C in a 0.02 for sources in which recoils were stopped in gold, and 0.67 450 deg C in a 0.01 for sources in which recoils were stopped in aluminum. Unattenuated angular correlations were obtained with liquid sources containing Am/sup 243/ in 0.5 M and 1.0 M HClO/sub 4/ . For liquid sources containing Am/sup 243/ in 3.0 M HClO/sub 4/, the correlation was attenuated, with an average attenuation coefficient of 0.86 450 deg C in a 0.01. Attenuated angular correlations were also found with liquid sources containing an even-even nuclide in dilute aqueous solutions The average attenuation coefficients for the even-even nuclide liquid sources were G/sub 2/ = 0.75 450 deg C in a 0.05 and G/sub 4/ = 0.86 450 deg C in a 0.03 for U/sub 232/ , G/sub 2/= 0.64 450 deg C in a 0.06 and G/sub 4/= 0.84 450 deg C in a 0.04 for Th/ sup 230/, and G/sub 2/ = 0.76 450 deg C in a 0.11 and G/sub 4/ = 0.90 450 deg C in a 0.07 for Ra/sup 226/. The postulate that the measured angular correlation function for Am/sup 243/ is attenuated by the same amount as the correlation functions for the even-even nuclides is found to be untenable since it requires unreasonable alpha mixing ratios or unreasonable admixtures of M2 to E1 gamma radiation in the Am/sup 243/ decay process. The attenuation observed with even-even nuclide sources is believed to be consistent with the postulate of a time-dependent electric interaction. 81 references. (auth)
- Research Organization:
- Argonne National Lab., Ill.
- DOE Contract Number:
- W-31-109-ENG-38
- NSA Number:
- NSA-17-021734
- OSTI ID:
- 4727695
- Report Number(s):
- ANL-6685
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALPHA PARTICLES
ALUMINUM
AMERICIUM 243
AMERICIUM OXIDES
ANGULAR DISTRIBUTION
BIBLIOGRAPHY
DECAY
EVAPORATION
FILMS
GAMMA RADIATION
GLASS
GOLD
LIQUIDS
MEMBRANES
MICA
NEPTUNIUM
NUMERICALS
PARTICLE SOURCES
PERCHLORIC ACID
RADIUM 226
RECOILS
RUBBER
SOLIDS
SOLUTIONS
THICKNESS
THORIUM 230
URANIUM 232
WATER