Abstract
The isomeric yield ratios in the production of nat Fe(γ ,xnp)52m,g Mn have been measured with photonuclear reactions. The high purity natural Fe metallic foils were used and irradiated with bremsstrahlung beams of end point energy 50-, 60-, and 70-MeV. The bremsstrahlung beams are produced with high energy electron beam struck with 0.1mm thin tungsten target. The activation method has been used and hence the induced activities in the irradiated foils were measured by off-line γ -ray spectrometric technique using HPGe detector coupled to a PC-based 4K MCA. The experimental values of isomeric ratios are compared with the theoretical values by statistical model code TALYS. The detail of the formation of isomers by photonuclear reactions together with the literature values of the investigated nuclides are compared and discussed.
Highlights
Investigation of the properties of excited nuclear states of a nuclear reaction gives the information on the probability of excitation, the energy, and spin distributions
The relative population of isomeric state and unstable ground state of a nucleus is termed as the isomeric ratio (IR), which can be expressed as m/ g, where m and g are the cross-sections for production of isomeric and unstable ground states
Since the isomeric and the ground state differ in spins, the isomeric ratio can be represented as a ratio of cross-sections for the production of high to low spin state, i.e., IR = high−spin/ low−spin [1,2,3]
Summary
Investigation of the properties of excited nuclear states of a nuclear reaction gives the information on the probability of excitation, the energy, and spin distributions. In case of bremsstrahlung photon irradiation, due to the continuity of the photon energy spectrum, the IR can be represented through the yields of two states, i.e., IR ≡ Yhigh−spin/Ylow−spin. This ratio depends on the spin of the target nucleus, and the intake angular momentum determined by the mass and the energy of projectile particles. In simple terms, it is dependent on the distributions of angular momenta in various stages of the reaction
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