Thermal-neutron capture by silicon isotopes

We have studied primary and secondary {gamma} rays (46 in {sup 29}Si, 107 in {sup 30}Si, and 33 in {sup 31}Si) following thermal-neutron capture by the stable {sup 28}Si, {sup 29}Si, and {sup 30}Si isotopes. Almost all of these {gamma} rays have been incorporated into corresponding level schemes con...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 1992-09, Vol.46 (3), p.972-983
Main Authors: Raman, S, Jurney, ET, Starner, JW, Lynn, JE
Format: Article
Language:English
Subjects:
663220 - Electromagnetic Transitions- (1992-)
663430 - Nucleon-Induced Reactions & Scattering- (1992-)
663530 - Nuclear Mass Ranges- A=20-38- (1992-)
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
CROSS SECTIONS
DATA
E1-TRANSITIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXCITED STATES
EXPERIMENTAL DATA
FERMIONS
GAMMA SPECTRA
HADRON REACTIONS
HADRONS
HOURS LIVING RADIOISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
MULTIPOLE TRANSITIONS
NEUTRON REACTIONS
NEUTRONS
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
NUMERICAL DATA
RADIOISOTOPES
SILICON 28 TARGET
SILICON 29
SILICON 29 TARGET
SILICON 30
SILICON 30 TARGET
SILICON 31
SILICON ISOTOPES
SPECTRA
STABLE ISOTOPES
TARGETS
THERMAL NEUTRONS
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Description
Summary:We have studied primary and secondary {gamma} rays (46 in {sup 29}Si, 107 in {sup 30}Si, and 33 in {sup 31}Si) following thermal-neutron capture by the stable {sup 28}Si, {sup 29}Si, and {sup 30}Si isotopes. Almost all of these {gamma} rays have been incorporated into corresponding level schemes consisting of 12 excited levels in {sup 29}Si, 28 in {sup 30}Si, and 9 in {sup 31}Si. In each case, the observed {gamma} rays account for nearly 100% of all captures. The measured neutron separation energies for {sup 29}Si, {sup 30}Si, and {sup 31}Si are 8473.56{plus minus}0.04, 10609.24{plus minus}0.05, and 6587.40{plus minus}0.05 keV, respectively. The measured thermal-neutron capture cross sections for {sup 28}Si, {sup 29}Si, and {sup 30}Si are 169{plus minus}4, 119{plus minus}3, and 107{plus minus}3 mb, respectively. In all three cases, primary electric-dipole ({ital E}1) transitions account for the bulk of the total capture cross section. We have calculated these {ital E}1 partial cross sections using direct-capture theory. The agreement between theory and experiment is satisfactory.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.46.972