Decay studies of neutron-deficient nuclei near the Z =64 subshell: sup 141 Dy, sup 141 Tb, sup 141 Gd sup g + m , and sup 141 Eu sup m

Journal Article · Tue Oct 31 23:00:00 EST 1989 · Physical Review (Section) C: Nuclear Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevC.40.2249· OSTI ID:5015267

Gilat, J; Nitschke, J M; Wilmarth, P A; Firestone, R B ^[1]

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1. Nuclear Science Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (US)

The {beta}/{gamma} and delayed proton decays of mass separated {ital A}=141 isotopes with {ital Z}=63--66 were investigated with an on-line mass separator. Branching ratios have been redetermined for the total {beta} decay of the 2.7(3) s, (11/2){sup {minus}} isomer {sup 141}Eu{sup {ital m}} at 96.5 keV (13{sub {minus}2}{sup +4}%), and for the direct {beta} feeding of the 1.58 keV (3/2){sup +} level of {sup 141}Sm in the decay of 40-s {sup 141}Eu{sup {ital g}} (73(5)%). Detailed decay schemes have been constructed for the decays of the (11/2){sup {minus}} isomer {sup 141}Gd{sup {ital m}} (11(2)% isomeric transition) and the (1/2){sup +} ground state, {sup 141}Gd{sup {ital g}}. Half-lives of 24.5(5) s and 14(4) s, respectively, have been determined for these isomers. A delayed proton branch of 0.03(1)% was identified in the decay of {sup 141}Gd{sup {ital g}}. A detailed decay scheme was also constructed for 3.5(2)-s {sup 141}Tb and a {ital J}{sup {pi}}=(5/2{sup {minus}} ) was assigned to its ground state, at variance with the systematics of heavier, odd-mass Tb isotopes. All {gamma}-ray assignments to the various isotopes are based on {ital x}{gamma} and {gamma}{gamma} coincidences and on half-life measurements. A 0.9(2)-s half-life for {sup 141}Dy was determined from its delayed proton decay. All spin assignments proposed in this paper are discussed in terms of Nilsson level diagrams and nuclear shapes.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5015267
• Journal Information: Physical Review (Section) C: Nuclear Physics; (USA), Journal Name: Physical Review (Section) C: Nuclear Physics; (USA) Vol. 40:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ANGULAR MOMENTUM
BARYONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BRANCHING RATIO
COINCIDENCE SPECTROMETRY
DECAY
DELAYED PROTONS
DYSPROSIUM 141
DYSPROSIUM ISOTOPES
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EUROPIUM 141
EUROPIUM ISOTOPES
EVEN-ODD NUCLEI
FERMIONS
GADOLINIUM 141
GADOLINIUM ISOTOPES
GAMMA DECAY
GAMMA RADIATION
HADRONS
HALF-LIFE
HEAVY ION ACCELERATORS
HILACS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LINEAR ACCELERATORS
NUCLEAR DECAY
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
PROTON-EMISSION DECAY
PROTONS
RADIATIONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SECONDS LIVING RADIOISOTOPES
SPIN
SUPERHILAC
TERBIUM 141
TERBIUM ISOTOPES