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Title: 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

Abstract

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 delayedmore » proton decay. All spin assignments proposed in this paper are discussed in terms of Nilsson level diagrams and nuclear shapes.« less

Authors:
; ; ;  [1]
  1. Nuclear Science Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (US)
Publication Date:
OSTI Identifier:
5015267
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Physical Review (Section) C: Nuclear Physics; (USA)
Additional Journal Information:
Journal Volume: 40:5; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; DYSPROSIUM 141; BETA DECAY; GAMMA DECAY; PROTON-EMISSION DECAY; EUROPIUM 141; GADOLINIUM 141; ENERGY LEVELS; TERBIUM 141; BRANCHING RATIO; COINCIDENCE SPECTROMETRY; DELAYED PROTONS; ENERGY-LEVEL TRANSITIONS; GAMMA RADIATION; HALF-LIFE; PARITY; SPIN; SUPERHILAC; ACCELERATORS; ANGULAR MOMENTUM; BARYONS; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; DECAY; DYSPROSIUM ISOTOPES; ELECTROMAGNETIC RADIATION; ELECTRON CAPTURE RADIOISOTOPES; ELEMENTARY PARTICLES; EUROPIUM ISOTOPES; EVEN-ODD NUCLEI; FERMIONS; GADOLINIUM ISOTOPES; HADRONS; HEAVY ION ACCELERATORS; HILACS; INTERMEDIATE MASS NUCLEI; IONIZING RADIATIONS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LINEAR ACCELERATORS; NUCLEAR DECAY; NUCLEI; NUCLEONS; ODD-EVEN NUCLEI; PARTICLE PROPERTIES; PROTONS; RADIATIONS; RADIOISOTOPES; RARE EARTH ISOTOPES; RARE EARTH NUCLEI; SECONDS LIVING RADIOISOTOPES; TERBIUM ISOTOPES; 651820* - Nuclear Properties & Reactions, A=150-189, Experimental

Citation Formats

Gilat, J, Nitschke, J M, Wilmarth, P A, and Firestone, R B. 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. United States: N. p., 1989. Web. doi:10.1103/PhysRevC.40.2249.
Gilat, J, Nitschke, J M, Wilmarth, P A, & Firestone, R B. 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. United States. https://doi.org/10.1103/PhysRevC.40.2249
Gilat, J, Nitschke, J M, Wilmarth, P A, and Firestone, R B. 1989. "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". United States. https://doi.org/10.1103/PhysRevC.40.2249.
@article{osti_5015267,
title = {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},
author = {Gilat, J and Nitschke, J M and Wilmarth, P A and Firestone, R B},
abstractNote = {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.},
doi = {10.1103/PhysRevC.40.2249},
url = {https://www.osti.gov/biblio/5015267}, journal = {Physical Review (Section) C: Nuclear Physics; (USA)},
issn = {0556-2813},
number = ,
volume = 40:5,
place = {United States},
year = {Wed Nov 01 00:00:00 EST 1989},
month = {Wed Nov 01 00:00:00 EST 1989}
}