Neutron cross section measurements using the ORELA: /sup 86/Kr(n,x), /sup 40/Ca(n,x), /sup 22/Ne(n,. gamma. ), /sup 189/Os(n,n'), /sup 186/ /sup 187/ /sup 188/ /sup 189/Os(n,x), /sup 189/Os(n,. gamma. ), /sup 148/ /sup 149/ /sup 150/Sm(n,. gamma. ), /sup 179/Ta(n,. gamma. ), /sup 86/ /sup 87/ /sup 88/Sr(n,x), /sup 40/Ar(n,x), the stable tellurium isotopes (n,. gamma. ) and /sup 205/Tl(n,x). Progress report, September 1, 1983-August 31, 1984

Technical Report · Sat Sep 01 04:00:00 EDT 1984

OSTI ID:6395348

Winters, R R

The research performed during this reporting period has resulted in (1) publication of two papers dealing with the optical model and with /sup 187/Os(n,n') for astrophysics; (2) preparation and submission of two papers describing measurements of /sup 148/ /sup 149/ /sup 150/Sm(n,..gamma..) and /sup 60/Ni(n,x) cross sections; (3) mesurement of the /sup 189/Os(n,n') cross sections at energies of astrophysical interest; (4) measurement of the /sup 189/Os(n,..gamma..) cross sections over a range of energies pertinent to astrophysical interest; (5) extraction of the tantalum target from an ORELA target assembly and arranging shipment of the radioactive tantalum to Kernforschungszentrum, West Germany, in preparation for a measurement of the /sup 179/Ta(n,..gamma..) cross sections; and (6) acquistion of a smart terminal computer workstation. Preliminary results from our /sup 189/Os measurements are consistent with the cross sections calculated using the same optical model reported by Hershberger et al. for /sup 187/Os. Hence the effect of the first excited state in /sup 187/Os on the use of the Re/Os beta decay as a stellar nucleosynthesis chronometer is very nearly as estimated by Woosley and Fowler. The duration of galactic nucleosynthesis is now estimated from the Re/Os chronmeter as approx. 11.3 byr. and the age of the universe as approx. 17 byr. 19 references.

• Research Organization: Denison Univ., Granville, OH (USA)
• DOE Contract Number: AC02-76ER02696
• OSTI ID: 6395348
• Report Number(s): DOE/ER/02696-25; ON: DE85002059
• Country of Publication: United States
• Language: English

Related Subjects

651725 -- Nuclear Properties & Reactions
A=90-149
Experimental-- Nuclear Reactions & Scattering-- (-1987)
651825* -- Nuclear Properties & Reactions
A=150-189
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
CAPTURE
CROSS SECTIONS
DATA
ELECTRON CAPTURE RADIOISOTOPES
EXPERIMENTAL DATA
HADRON REACTIONS
INELASTIC SCATTERING
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
NEUTRON REACTIONS
NICKEL 60 TARGET
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
ODD-EVEN NUCLEI
OSMIUM 189 TARGET
RADIOISOTOPES
RESEARCH PROGRAMS
SAMARIUM 148 TARGET
SAMARIUM 149 TARGET
SAMARIUM 150 TARGET
SCATTERING
TANTALUM 179
TANTALUM ISOTOPES
TARGETS
YEARS LIVING RADIOISOTOPES