Measurements of {sup 142,144}Nd(n,{gamma}) cross sections at ORELA for astrophysical s-process studies

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We have completed measurements of the {sup 142, 144}Nd(n,{gamma}) cross sections from approximately 20 eV to 200 keV at the Oak Ridge Electron Linear Accelerator (ORELA) using a recently improved C{sub 6}D{sub 6} detector apparatus. {sup 142}Nd is an s-only isotope, i.e. it is only formed during the s-process. It has a closed neutron shell and therefore defines a step in the < {sigma} >N, curve from which the mean s-process neutron exposure can be calculated. In addition, {sup 144}Nd is the normalization point for the neodymium abundances. Also accurate (n,{gamma}) cross sections would help to determine the r- and ... continued below

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5 p.

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Guber, K.H.; Spencer, R.R. & Koehler, P.E. August 1, 1996.

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We have completed measurements of the {sup 142, 144}Nd(n,{gamma}) cross sections from approximately 20 eV to 200 keV at the Oak Ridge Electron Linear Accelerator (ORELA) using a recently improved C{sub 6}D{sub 6} detector apparatus. {sup 142}Nd is an s-only isotope, i.e. it is only formed during the s-process. It has a closed neutron shell and therefore defines a step in the < {sigma} >N, curve from which the mean s-process neutron exposure can be calculated. In addition, {sup 144}Nd is the normalization point for the neodymium abundances. Also accurate (n,{gamma}) cross sections would help to determine the r- and p-process residuals of these isotopes and will impact the interpretation of the recently discovered isotopic anomalies in silicon carbide grains from the Murchison meteorite. Our new (n, {gamma}) cross sections also show that reaction rate extrapolations for nuclei near closed neutron shells from measured values at 30 keV down to 8 keV can be inaccurate.

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5 p.

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INIS; OSTI as DE96013775

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  • 4. nuclei in the cosmos conference, South Bend, IN (United States), 20-27 Jun 1996

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  • Other: DE96013775
  • Report No.: CONF-9606248--2
  • Grant Number: AC05-96OR22464;FG05-87ER40361
  • Office of Scientific & Technical Information Report Number: 379115
  • Archival Resource Key: ark:/67531/metadc686979

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  • August 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • May 2, 2016, 4:28 p.m.

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Guber, K.H.; Spencer, R.R. & Koehler, P.E. Measurements of {sup 142,144}Nd(n,{gamma}) cross sections at ORELA for astrophysical s-process studies, article, August 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc686979/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.