Radioactive decay studies at TRISTAN. Progress report, January 1, 1983-September 30, 1984

Technical Report · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6383768

Walters, W B

Our study of nuclear structure of neutron-rich fission products at the on-line mass separator TRISTAN has continued at a strong pace during the past year. The study of the odd-odd La nuclides, /sup 142/ /sup 144/ /sup 146/ /sup 148/La, has been concluded with the preparation of the /sup 146/La level scheme. The systematic drop in position of the lowest 1/sup +/ levels and the abrupt increase in the number of levels that are strongly fed in ..beta.. decay in /sup 146/La can be used to pinpoint the onset of strong deformation in that nuclide. Or, that spread of ..beta.. strength can be attributed to the presence of low-lying octupole structures. New data have been presented on the lower odd-odd N=83 nuclides which indicate that the Pi g/sub 7/2/nu f/sub 7/2/ parabola which is a large particle hole parabola in /sup 140/La is quenched in /sup 138/Cs and inverted in /sup 136/I. The first results of a major new study of /sup 132/Sb and /sup 130/Sb levels populated in the decay of 40-s /sup 132/Sn and 2-min and 4-min /sup 130/Sn, respectively, are reported. These data indicate a 4/sup +/ ground state for /sup 130/Sb and reveal many new negative parity levels. Angular correlation and decay scheme data are reported for decay of /sup 139/Xe to levels of /sup 139/Cs. The results support 5/2/sup +/ and 3/2/sup +/ assignments for the 218- and 289-keV levels, respectively, and reveal a close doublet at 393 keV. Except for an extra low-lying level, a nearly level-for-level correspondence is observed with isotonic /sup 141/La, which is also under study. An angular correlation study of the levels of the 2-particle-4-hole nuclide /sup 116/Cd fed in the decay of 2/sup -/ and 5/sup +/ isomers of /sup 116/Ag has resolved the location of the two lowest excited 0/sup +/ levels and disclosed over 200 new ..gamma.. rays. The possibility of intruder levels in /sup 142/Ba is also under study.

• Research Organization: Maryland Univ., College Park (USA). Dept. of Chemistry
• DOE Contract Number: AS05-79ER10494
• OSTI ID: 6383768
• Report Number(s): DOE/ER/10494-5; ON: DE85003243
• Country of Publication: United States
• Language: English

Related Subjects

651722 -- Nuclear Properties & Reactions
A=90-149
Experimental-- Radioactive Decay-- (-1987)
651723* -- Nuclear Properties & Reactions
A=90-149
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
ANGULAR CORRELATION
ANGULAR MOMENTUM
ANTIMONY 130
ANTIMONY 132
ANTIMONY ISOTOPES
BARIUM 142
BARIUM 146
BARIUM ISOTOPES
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
CADMIUM 116
CADMIUM ISOTOPES
CESIUM 138
CESIUM 139
CESIUM 142
CESIUM ISOTOPES
CORRELATIONS
DATA
DAYS LIVING RADIOISOTOPES
DECAY
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FISSION PRODUCTS
GAMMA RADIATION
INFORMATION
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LANTHANUM 140
LANTHANUM 146
LANTHANUM ISOTOPES
MATERIALS
MINUTES LIVING RADIOISOTOPES
NEUTRON-RICH ISOTOPES
NUCLEAR STRUCTURE
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PARITY
PARTICLE PROPERTIES
RADIATIONS
RADIOACTIVE MATERIALS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RESEARCH PROGRAMS
SECONDS LIVING RADIOISOTOPES
SILVER 116
SILVER ISOTOPES
SPIN
STABLE ISOTOPES
TIN 130
TIN 132
TIN ISOTOPES
XENON 139
XENON ISOTOPES