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), Vol. 42:1; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARIUM 132
NEUTRON REACTIONS
BARIUM 134 TARGET
BARIUM 135 TARGET
BARIUM 136
STRENGTH FUNCTIONS
BARIUM 136 TARGET
BARIUM 137 TARGET
BARIUM 138
BARIUM 138 TARGET
CAPTURE
GE SEMICONDUCTOR DETECTORS
M1-TRANSITIONS
NEUTRON SEPARATION ENERGY
SPIN
THERMAL NEUTRONS
ALKALINE EARTH ISOTOPES
ANGULAR MOMENTUM
BARIUM ISOTOPES
BARYON REACTIONS
BARYONS
BINDING ENERGY
ELEMENTARY PARTICLES
ENERGY
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
FERMIONS
FUNCTIONS
HADRON REACTIONS
HADRONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MEASURING INSTRUMENTS
MULTIPOLE TRANSITIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PARTICLE PROPERTIES
RADIATION DETECTORS
SEMICONDUCTOR DETECTORS
STABLE ISOTOPES
TARGETS
651720* - Nuclear Properties & Reactions
A=90-149
Experimental