Thermal-neutron capture by silicon isotopes

Journal Article · Tue Sep 01 00:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.972· OSTI ID:7011791

Raman, S ^[1]; Jurney, E T; Starner, J W; Lynn, J E ^[2]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

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.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7011791
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 46:3; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663220 -- Electromagnetic Transitions-- (1992-)
663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
663530 -- Nuclear Mass Ranges-- A=20-38-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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 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