G.S. Mani

Absolute cross-sections for some (n, p), (n, α) and (n, 2n) reactions

Abstract The reactions Al 27 (n, α)Na 24 , Mg 24 (n, p)Na 24 , Si 28 (n, p)Al 28 , Co 59 (n, p)Fe 59 , Co 59 (n, 2n) Co 58 , Co 59 (n, α)Mn 56 , Ni 58 (n, p)Co 58 and Ni 58 (n, 2n)Ni 57 have been studied by an activation method from 12.5–21.0 MeV neutron energy. A method of calibrating well-type crystals to obtain absolute efficiency is described. The results for absolute cross-sections obtained by this method for the above reactions are compared with statistical model calculations in which the nuclear transmission coefficients have been derived from an average optical potential extracted from the scattering data.

Elastic scattering of 50 MeV Protons by Nuclei in the range from 42Ca to 208Pb

Abstract Differential cross sections for elastic scattering of 50 MeV protons by nineteen nuclei spread over the range from 42Ca to 208Pb were measured. Polarization measurements for some of these nuclei were also done. The data was analysed in terms of standard optical model. The extraction of the symmetry term from the variation of the real part of the potential with mass number A and isospin T is discussed.

The Li6(d, α)α reaction

The Li/sup 6/(d, alpha ) alpha reaction was studied up to 5 Mev deuteron energy. A level in Be/sup 8/ at 25.3 Mev excitation was observed having probably J = 2 plus or minus and T = 0. (auth)

Study of the reaction Li7(p, α)α up to 12 MeV proton energy

Abstract The Li7(p, α)α reaction has been studied up to 12 MeV proton energy. Four alpha emitting states in Be8 are observed. The results are discussed in terms of reaction mechanism and levels in Be8.

Spin assignments to excited states of 56Fe using inelastic proton scattering

Abstract Inelastic proton scattering from 56Fe at 49.35 MeV has been studied with protons from a linear accelerator. Angular distributions for thirty excited states up to an excitation of 7.5 MeV in 56Fe were obtained. Spin and parity assignments to most of the states were made using DWBA analysis with first order collective form factors. The structure of this nucleus is discussed in the light of the present data.

Elastic scattering of 50 MeV protons by light nuclei

Abstract Differential cross-section and polarisation measurements have been made for elastic scattering of 50 MeV protons by 6Li, 7Li and 9Be. An optical-model analysis of the data is presented. The parameters of the optical-model potential obtained compares reasonably well with those obtained for heavier nuclei.

THE Li

Abstract The Li7(p, α)α reaction has been studied up to 4.8 MeV proton energy. The angular distribution has been fitted to a polynomial of the form C(E)(1+A(E)cos2θ+B(E)cos4θ). The coefficients A(E) and B(E) show enormous variation above 4.0 MeV proton energy. The results are discussed in terms of levels in Be8. The results indicate also the presence of direct interaction.

sup 6

The Li/sup 6/(p, alpha )He/sup 3/ reaction was studied up to 5 Mev proton energy. The excitation curve and angular distributions were measured from 2.0 to 5.0 Mev proton energy in steps of about 100 kev. The possible existence of a positive parity state of Be/sup 7/ around 4.0 Mev proton energy is indicated. (auth)Abstract The Li6(p, α)He3 reaction has been studied up to 5 MeV proton energy. The excitation curve and angular distributions were measured from 2.0 to 5.0 MeV proton energy in steps of about 100 keV. The possible existence of a positive parity state of Be7 around 4.0 MeV proton energy is indicated.

(d,

Abstract Inelastic scatterin of 49.35 MeV protons by 58 Fe has been studied. The angular distribution has been measured for fourteen excited states. Spin and parity assignments to most of the states were made using DWBA analysis with first-order collective form factors.

alpha

Abstract The excitation curves for the reactions C12(d, d)C12, C12(d, p0)C13, C12(d, p1)C13∗, C12 (d, p2)C13∗ and C12(d, p3)C13∗ have been measured at two angles, 143.5° and 155° in the laboratory system, for deuteron energies from 0.9 to 5.0 MeV. The data give evidence for a large resonant contribution in deuteron reactions with C12 even at 5 MeV. A number of new levels have been found in N14 at excitation energies from 11 to 15 MeV.