Neutron spectra and angular distributions from the reactions /sup 181/Ta(p,n)/sup 181/W and /sup 181/Ta(n,n')/sup 181/Ta

Journal Article · Thu Dec 01 04:00:00 EST 1977 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:6711744

Biryukov, N S; Zhuravlev, B V; Kornilov, N V; Rudenko, A P; Sal'nikov, O A; Trykova, V I

Spectra and angular distributions have been measured for neutrons from the reactions /sup 181/Ta(n,n')/sup 181/Ta at initial neutron energy 9.1 +- 0.2 MeV and /sup 181/Ta(p,n)/sup 181/W for E/sub p/=10.2 +- 0.2 MeV. The neutron spectra were measured by the time-of-flight method in the 150-cm cyclotron at our Institute at angles 30, 60, 90, 120, and 150/sup 0/. It is shown that for identical excitation energy of the nuclei the integrated spectrum of inelastically scattered neutrons has a more energetic form than the neutron spectrum from the (p,n) reaction, and an analysis of the spectra carried out in terms of the model of pre-equilibrium nuclear decay showed that the difference in the fraction of nonequilibrium processes is significantly greater than predicted by the model. The angular distribution of inelastically scattered neutrons has a strong asymmetry in the high energy part, while in the (p,n) reaction it is symmetric within experimental error about 90/sup 0/. This apparently indicates that direct processes whose contribution to the spectrum in the (p,n) reaction is substantially smaller are responsible for the high-energy portion of the spectrum.

• Research Organization: Physics and Power Engineering Institute, Obninsk
• OSTI ID: 6711744
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 26:6; ISSN SJNCA
• Country of Publication: United States
• Language: English

Related Subjects

651825* -- Nuclear Properties & Reactions
A=150-189
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
ELECTRON CAPTURE RADIOISOTOPES
ENERGY RANGE
EVEN-ODD NUCLEI
HADRON REACTIONS
HEAVY NUCLEI
INELASTIC SCATTERING
ISOTOPES
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRON REACTIONS
NEUTRON SPECTRA
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PRECOMPOUND-NUCLEUS EMISSION
PROTON REACTIONS
RADIOISOTOPES
SCATTERING
SPECTRA
TANTALUM 181 TARGET
TARGETS
TIME-OF-FLIGHT METHOD
TIME-OF-FLIGHT METHOD INELASTIC SCATTERING
TUNGSTEN 181
TUNGSTEN ISOTOPES