152m1Eu(8 ?)– 152m2Eu(0 ?) produced in (γ, n) photonuclear reaction in the giant dipole resonance region]]>

摘要

In this work, the isomeric ratio of_(152m1)Eu(8_(?))–_(152m2)Eu(0_(?)) produced from the_(153)Eu(γ, n)_(152)Eu reaction have been measured in the whole giant dipole resonance region by the activation method. In order to improve the accuracy of the experimental results, the necessary corrections were made in the gamma activity measurements and data analysis. The results were discussed and compared with the similar data from literature to examine the excitation energy, the spin difference and the nuclear reaction channel effects and can be used for the interpretation on the structure of the nucleus and the mechanisms of nuclear reactions. The data for bremsstrahlung end-point energies of 19–23?MeV are first-time measurements.