Radioactive decay studies at TRISTAN. Progress report, December 1, 1981-December 31, 1982

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6570862

Walters, W B

It was found possible to interpret the levels of the odd-odd N = 83 nuclides by parabolic fits to plots of multiplet splitting versus I(I + 1). Parameters are found that account for the splitting, displacement and inversion of these multiplets. It is concluded that the interaction between the odd proton and odd neutron in the N + 83 nuclides is largely a quadrupole interaction. Moreover, the effect of odd I-even I staggering that comes from the delta interaction is not significant. Using the parabolic parameters for /sup 140/La, it is possible to project the low-lying multiplets in /sup 142/La and compare them with the new level scheme that has been completed for /sup 142/La. The density of observed levels is in accord with the projection and the new 0.87 ..mu..s isomer lies at the vertex of one of the paraboli. The first PAC measurements at TRISTAN have been concluded and g factors determined for the first 2/sup +/ states in /sup 144/Ba and /sup 146/Ba. New level schemes for odd-odd /sup 146/La, /sup 148/La, and /sup 148/Pr reveal sharp differences in the behavior of the 1/sup +/ levels in Pr versus La as neutron pairs are added beyond the closed shell at N + 82. These changes are most important at N + 88. Two new isomers have been identified, a 5 ns level at 48 or 55 keV in /sup 141/La and an 870 ns level at 145 keV in /sup 142/La. Additional evidence for isomerism in /sup 148/Pr has been obtained by careful measurements of the half lives of several intense ..gamma.. rays and by measuring the intensity of /sup 148/Pr ..gamma.. rays as power is varied on the ion source.

• Research Organization: Maryland Univ., College Park (USA). Dept. of Chemistry
• DOE Contract Number: AS05-79ER10494
• OSTI ID: 6570862
• Report Number(s): DOE/ER/10494-4; ON: DE83005474
• Country of Publication: United States
• Language: English

Related Subjects

651722* -- Nuclear Properties & Reactions
A=90-149
Experimental-- Radioactive Decay-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
BARIUM 139
BARIUM 142
BARIUM 146
BARIUM 148
BARIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CERIUM 148
CERIUM ISOTOPES
DATA
DAYS LIVING RADIOISOTOPES
DECAY
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERS
ISOTOPES
LANTHANUM 140
LANTHANUM 142
LANTHANUM 146
LANTHANUM 148
LANTHANUM ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
PRASEODYMIUM 142
PRASEODYMIUM 148
PRASEODYMIUM ISOTOPES
PROMETHIUM 144
PROMETHIUM ISOTOPES
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RESEARCH PROGRAMS
SECONDS LIVING RADIOISOTOPES
STORAGE RINGS
TRISTAN STORAGE RINGS
YEARS LIVING RADIOISOTOPES