Neutron Capture Cross Sections

These
experiments have used the OSU nuclear reactor to produce radioactive species by
neutron capture. From the activity (decay rate) of the resulting radioisotopes,
it is possible to deduce the cross section (probability) for neutron
capture. These results have both theoretical and practical
importance. From the theoretical standpoint, the cross section is a
fundamental property of the nucleus whose values can be calculated and compared
with experiment as a test of the applicability of different models of nuclear
structure. The practical importance of precise knowledge of the cross
sections includes the production of radioisotopes for medical uses and the
calculation of shielding and activation of materials exposed to neutrons.

The photos below show our detector laboratory and the reactor core. The
blue glow comes from Cerenkov radiation emitted by charged particles
(electrons) whose speeds exceed the speed of light in the water that serves as
shielding in the reactor.

Here are some recent publications from this research:

"Neutron Capture Cross Section of
^{44}Ti," R. Ejnisman, I. D. Goldman, K.
S. Krane, P. Mohr, Y. Nakazawa,
E. B. Norman, T. Rauscher, and J. Reel, *Phys. Rev. C* **58**, 2531
(1998).

“Measurement of Neutron Cross Sections
for Medical Isotopes,” S. E. Binney, K. S. Krane, M. A. Garland, G. A. Pertmer,
and S. Mirzadeh,” *Trans. American
Nuclear Society* **86**, 167 (2002).

“Neutron Capture
Cross Section of ^{102}Pd,” C. L. Duncan and K. S. Krane,
*Phys. Rev.C* **71**, 054322 (2005).

“Neutron Capture
Cross Sections of ^{112,116,122,124}Sn,” K. S. Krane
and J. Sylvester, *Phys. Rev. C* **73**, 054312 (2006).

“Neutron Capture Cross Sections of ^{148}Gd
and the Decay of ^{149}Gd,” M. G. Rios, R. Casperson,
K. S. Krane, and E. B. Norman, *Phys. Rev. C* **74**,
044302 (2006).

“Neutron Capture
Cross Sections of Even-Mass Tellurium Isotopes,” M. C. Eastman and K. S. Krane, *Phys. Rev. C*
**77**, 024303 (2008).

“Neutron Capture by
Ru: Neutron Cross Sections of ^{96,102,104}Ru and *g*-ray Spectroscopy in the Decays of ^{97,103,105}Ru,”
K. S. Krane, *Phys.
Rev. C* **81**, 044310 (2010).

“Gamma-ray
Spectroscopy in the Decays of ^{80m}Br and ^{82g}Br,” K. S. Krane, *Applied
Radiation and Isotopes* **69**, 201
(2011).

“Gamma-Ray Energies in the Decay of ^{38}Cl,”
K. S. Krane, M. L. Keck, E. B. Norman, and A. P. Shivprasad, *Applied
Radiation and Isotopes* **70**, 740
(2012).

“The Decays of ^{70,72}Ga to
Levels of ^{70,72}Ge and the Neutron Capture Cross Sections of Ga,” K.
S. Krane, *Applied
Radiation and Isotopes* **70**, 1649
(2012).

“Neutron Capture Cross
Sections of ^{184,189,190,192}Os and the Decays of ^{185}Os, ^{190}Os* ^{m}*,

“Neutron Capture
Cross Sections of ^{130,132,134,136,138}Ba,” A. Y. Dauenhauer and K. S.
Krane, *Physical Review C* **85**, 064301 (2012).

“Neutron Capture
Cross Sections of ^{136,138,140,142}Ce and the Decays of ^{137}Ce,”
S. Torrel and K. S. Krane, *Physical
Review C* **86**, 034340 (2012).

“Neutron Capture by ^{94,96}Zr
and the Decays of ^{97}Zr and ^{97}Nb,” K. S. Krane, *Applied
Radiation and Isotopes* **94**, 60
(2014).

“Neutron Capture Cross Sections of ^{194}Hg
and the Decays of ^{195}Hg,” S. F. Dorsett and K. S. Krane, *Applied** Radiation and Isotopes* **96**, 83 (2015).

Much of this research has been carried
out by undergraduate physics majors for their senior thesis projects.
Here is a list of undergraduate and graduate theses that have resulted from
this work:

“Thermal Neutron
Capture Cross Sections of ^{68}Ge and ^{148}Gd,” Maribel Gomez
Rios, (M.S., 1999).

“The Neutron Capture Cross Section of ^{208}Pb,”
Miriam Lambert, (Honors B.S., 2000)

“Measurement of the Thermal Neutron
Absorption Cross Section of ^{160}Tb,” Jeremy Wolf (B.S., 2001)

“Measurements of Neutron Activation in
Palladium Isotope 102,” Christopher Duncan (B.S., 2001)

“Measurement of the Thermal Neutron
Absorption Cross-section of ^{194}Hg and ^{194}Au,” Skye
Dorsett (B.S., 2001)

“Neutron Activation Analysis of ^{195m}Pt
and ^{117m}Sn,” Rachel Bartlett (B.S., 2002)

“Measuring the Neutron Capture Cross
Section of ^{148}Gd,” Robert J. Casperson
(B.S., 2004)

“Using Angular Correlation to
Determine Decay Behavior in Nuclei Through the
Analysis of Coincidence Sum Peaks,” Werner W. Hager IV (Honors B.S., 2004)

“Measurements of Sn Neutron Activation
Cross Sections Through Neutron Activation Analysis,”
Jeremy Sylvester (B.S., 2005)

“Neutron Capture Cross Sections and
Resonance Integrals of Tellurium Isotopes,” Micah C. Eastman (B.S., 2006)

“Neutron Capture Cross Sections and
Resonance Integrals of Cadmium Isotopes,” Ken Takahashi (B.S., 2008)

“Neutron Capture Cross Sections,
Resonance Integrals and Half-lives of Barium Isotopes,” Alex Dauenhauer (B.S., 2010)

“Neutron Capture Cross Sections and
Half-lives of Cerium Isotopes,” Sol Torrel (B.S.,
2010)

“Neutron Capture Cross Sections of
Cadmium Isotopes,” Allison Gicking (B.S., 2012)

“Measuring Neutron Absorption Cross
Sections of Natural Platinum via Neutron Activation Analysis,” Nick Petersen
(B.S., 2012)

“X-ray Emissions in Measurements of
the Neutron Capture Cross Sections for the Production of ^{197}Hg and ^{197}Pt
and Scoping the Science Parameter Space of Future X-ray Astrophysics Calorimeter
Missions,” Mason L. Keck (Honors B.S., 2012)