ANGULAR-MOMENTUM EFFECTS ON NEUTRON EMISSION BY Dy AND TB COMPOUND NUCLEI

Technical Report · Sat Sep 01 04:00:00 EDT 1962

OSTI ID:4649294

Simonoff, G N; Alexander, J M

Three reactions producing 4.1-hr Tb/sup 149/ from Tb compound nuclei and nine reactions producing Dy products from Dy compound nuclei were studied as a function of energy. Incident particles were B/sup 10/, B/sup 11/, C/sup 12/, and O/sup 16./ of energ y 4 to 10.4 Mev amu. Measurements of the average recoil range give strong evidence that all these reactions proceed by compound-nucleus formation. From angular distribution data on the final heavy products for all these reactions the average total energies of photons and neutrons for each reaction were derived. In the Tb reactions the average total photon energy is always less than 12 Mev. In the Dy reactions the average total photon energy varies linearly with total available energy from nearly 0 to about 30 Mev. These large differences in total photon energy are attributed to differences in the angular momenta of the initial compound nuclei. The rate of increase of the average kinetic energy of all neutrons (from Dy systems) is approximately proportional to the square root of the excitation energy. For a given excitation energy of the Dy systems the average total photon energy does not appear to vary with average angular momentum. (auth)

• Research Organization: California. Univ., Berkeley. Lawrence Radiation Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-17-036666
• OSTI ID: 4649294
• Report Number(s): UCRL-10099(Rev.)
• Country of Publication: United States
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BORON 10
BORON 11
CARBON 12
DYSPROSIUM
EMISSION
ENERGY
EXCITATION
LIFETIME
MEASURED VALUES
MEV RANGE
MOMENTUM
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
OXYGEN 16
PHOTONS
PHYSICS
RECOILS
TERBIUM 149
VELOCITY