Single particle effects in precompound reactions

Journal Article · Thu Nov 01 04:00:00 EST 1984 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.30.1480· OSTI ID:6264667

Scobel, W; Blann, M; Komoto, T T; Trabandt, M; Grimes, S M; Hansen, L F; Wong, C; Pohl, A B.A.

Double differential cross sections have been measured with time of flight techniques at 16 angles between 3.5/sup 0/ and 159/sup 0/ (lab) for the inclusive production of neutrons from reactions of 25 MeV protons with /sup 50,52,53/Cr, /sup 54,56,58/Fe, /sup 59/Co, /sup 60/Ni, /sup 63/Cu, /sup 89/Y, /sup 90,91,92,94/Zr, /sup 92,94,95,96,97,98,100/Mo, /sup 110/Pd, and /sup 159/Tb and of 18 MeV protons with /sup 90,91,92,94/Zr. The spectra from /sup 90,91,92,94/Zr targets are compared with qualitative and quantitative predictions based on proton-particle--neutron-hole state densities generated from different sets of single particle states using the recursion method of Williams et al. An end point gap of nearly 4 MeV in the /sup 91/Zr(p,n) spectrum may be understood quantitatively in terms of such an extreme single particle model argument. The experimental peak structure shows reasonably good agreement with the calculated results. It is shown that precompound spectra exhibit pronounced structure which is dependent upon nuclear structure effects for near closed shell nuclei, and that these effects should and do disappear rapidly with nuclear deformation, as predicted earlier by Williams et al.

• Research Organization: Lawrence Livermore National Laboratory, University of California, Livermore, California 94550
• OSTI ID: 6264667
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 30:5; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CHARGED-PARTICLE REACTIONS
CHROMIUM 50 TARGET
CHROMIUM 52 TARGET
CHROMIUM 53 TARGET
CHROMIUM ISOTOPES
COBALT 59 TARGET
COPPER 63 TARGET
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HADRON REACTIONS
INTERMEDIATE MASS NUCLEI
IRON 54 TARGET
IRON 56 TARGET
IRON 58 TARGET
IRON ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MOLYBDENUM 100 TARGET
MOLYBDENUM 92 TARGET
MOLYBDENUM 94 TARGET
MOLYBDENUM 95 TARGET
MOLYBDENUM 96 TARGET
MOLYBDENUM 97 TARGET
MOLYBDENUM 98 TARGET
MOLYBDENUM ISOTOPES
NICKEL 60 TARGET
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PALLADIUM 110 TARGET
PRECOMPOUND-NUCLEUS EMISSION
PROTON REACTIONS
RADIOISOTOPES
STABLE ISOTOPES
TARGETS
TERBIUM 159 TARGET
YTTRIUM 89 TARGET
ZIRCONIUM 90
ZIRCONIUM 91
ZIRCONIUM 92
ZIRCONIUM 94
ZIRCONIUM ISOTOPES