Decay of /sup 146/Tb and the lowest 2/sup +/ state in /sup 146/Gd

Journal Article · Mon Sep 01 00:00:00 EDT 1980 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.22.1341· OSTI ID:5188245

Toth, K S

A recent in-beam study indicates that the first-excited state in the N=82 nucleus, /sup 146/Gd, is 3/sup -/, rather than 2/sup +/ as systematics had indicated. A subsequent investigation, which utilized /sup 144/Sm(..cap alpha..,2n..gamma..) excitation function measurements, has provided evidence that the lowest 2/sup +/ state in /sup 146/Gd lies at 1971 keV, about 392 keV above the 3/sup -/ level. It seems therefore that, as in the case of /sup 16/O, /sup 40/Ca, and /sup 208/Pb where the first-excited states are not 2/sup +/, /sup 146/Gd may have a doubly closed-shell structure. Previously, we investigated levels in /sup 146/Gd populated in the decay of 23-s /sup 146/Tb. Data from these decay studies were reexamined, and a weak 1971.8-keV ..gamma.. ray was observed to follow the decay of /sup 146/Tb. This transition most probably deexcites the 2/sup +/ /sup 146/Gd level seen in the /sup 144/Sm(..cap alpha..,2n..gamma..) reaction. In the light of the newly available information, a modified /sup 146/Tb decay scheme is presented and discussed.

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• OSTI ID: 5188245
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 22:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ANGULAR MOMENTUM
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DECAY
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
ENERGY SPECTRA
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
GADOLINIUM 146
GADOLINIUM ISOTOPES
GAMMA SPECTRA
HALF-LIFE
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
NEUTRON SPECTRA
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
PARITY
PARTICLE PROPERTIES
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SAMARIUM 144 TARGET
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
SPECTRA
SPIN
TARGETS
TERBIUM 146
TERBIUM ISOTOPES