M 1 and E 2 strength functions of barium from thermal neutron capture

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.42.207· OSTI ID:6505315

Islam, M A; Kennett, T J; Prestwich, W V ^[1]

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1. Department of Physics, McMaster University, Hamilton, ON (Canada)

Thermal-neutron-capture gamma rays from natural barium have been studied at the tangential facility of a reactor using a pair spectrometer. Precise transition, level, and neutron separation energies of six isotopes of barium are inferred. The separation energies are {ital S}{sub {ital n}}({sup 133}Ba)=7189.96{plus minus}0.36, {ital S}{sub {ital n}}({sup 135}Ba)=6972.21{plus minus}0.18, {ital S}{sub {ital n}}({sup 136}Ba)=9107.84{plus minus}0.04, {ital S}{sub {ital n}}({sup 137}Ba)=6905.78{plus minus}0.03, {ital S}{sub {ital n}}({sup 138}Ba) =8611.75 {plus minus}0.04, and {ital S}{sub {ital n}}({sup 139}Ba)=4723.44{plus minus}0.04 keV. The {ital M}1 strength functions of {sup 136}Ba and {sup 138}Ba are found to be (27{plus minus}7){times}10{sup {minus}9} and (5.7{plus minus}2.1){times}10{sup {minus}9} MeV{sup {minus}3}, the former being much higher and the latter much lower than the global average of 18{times}10{sup {minus}9} MeV{sup {minus}3}. The average {ital B}({ital E}2){bar {down arrow}} of {sup 136,138}Ba observed is 53{plus minus}35 {ital e}{sup 2}fm{sup 4}MeV{sup {minus}1}, which is 0.6{plus minus}0.4 times the value predicted by the Axel-Brink hypothesis.

• OSTI ID: 6505315
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 42:1; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ANGULAR MOMENTUM
BARIUM 132
BARIUM 134 TARGET
BARIUM 135 TARGET
BARIUM 136
BARIUM 136 TARGET
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ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
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GE SEMICONDUCTOR DETECTORS
HADRON REACTIONS
HADRONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
M1-TRANSITIONS
MEASURING INSTRUMENTS
MULTIPOLE TRANSITIONS
NEUTRON REACTIONS
NEUTRON SEPARATION ENERGY
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PARTICLE PROPERTIES
RADIATION DETECTORS
SEMICONDUCTOR DETECTORS
SPIN
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