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This work presents work results of investigation of the isomeric yield ratios of the $^{110} Pd (\gamma,n)^{109m,g} Pd$, $^{110} Pd (n,2n) ^{109m,g} Pd$ and $^{108} Pd (n,\gamma) ^{109m,g} Pd$ reactions. The isomeric yield ratios were measured by the induced radioactivity method. Samples of natural Pd (Palladium metal foils) have been irradiated in the bremsstrahlung beam in the energy range of $10\div 35$ MeV with energy step of $1$ MeV. For $14$ MeV neutron irradiation, we used the NG-150 neutron generator. For the $(n, \gamma)$ reaction, experiments were carried out at the ВВЗ-СМ research reactor of the Institute of Nuclear Physics of the Academy of Sciences of the Republic of Uzbekistan.
The gamma spectra reactions products were measured with a spectroscopic system consisting of HPGe detector CANBERRA with energy resolution of $1.8$ keV at $1332$ keV gamma ray of $^{60} Co$, amplifier 2022 and multichannel analyzer 8192 connected to computer for data processing. The filling of the isomeric and ground levels was identified according to their $\gamma$ lines. The values of isomeric ratios for the reactions $(\gamma, n)$, $(n, 2n)$ and $(n, \gamma)$ are respectively: $0.063 \pm 0.003$ (at $E_{\gamma max} = 30$ MeV); $0.43 \pm 0.03$ (at $E_n=14.1$ MeV) and $9.1 \pm 0.8$. Using the isomer yield ratio and the total cross section of the $(\gamma, n)$ reaction on $^{110} Pd$ [1] received the cross sections of $(\gamma, n) ^m $ and $(\gamma, n) ^g $ reactions. The cross section isomeric ratios at $E_{\gamma}=E_m$ are estimated.
The isomeric cross-section ratios were determined in the case of the reaction $(n, 2n)$. In order to obtain the absolute values of the cross sections for the ground state and fot the isomeric state, use was made of methods based on comparing the yields of the reaction under study and the monitoring reaction. The reaction $^{27} Al (n,\alpha) ^{24} Na$ ($T_{1/2} = 15$ h, $E_{\gamma} = 1368$ keV). For reaction $(n, \gamma)$, $^{197} Au (n, \gamma)$ was used as a monitor reaction.
The experimental results have been discussed, compared with those of other authors as well as considered by the statistical model. Theoretical values of the isomeric yield ratios have been calculated by using code TALYS-1.6.
- A.V. Varlamov et al. Atlas of GDR. INDS(NDS)-394.// Vienna: IAEA, 1999.
| The speaker is a student or young scientist | No |
|---|---|
| Section | 2. Experimental and theoretical studies of nuclear reactions |
