Excitation function and isomeric cross-section ratio for theNi61(p,α)58Com,gprocess
| Autor: | Sándor Sudár, F. Szelecsényi, S. M. Qaim |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Physical Review C. 48:3115-3118 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.48.3115 |
| Popis: | Excitation functions were measured by the stacked-foil technique for $^{61}\mathrm{Ni}$(p,\ensuremath{\alpha}${)}^{58}$${\mathrm{Co}}^{\mathit{m}}$ and $^{61}\mathrm{Ni}$(p,\ensuremath{\alpha}${)}^{58}$${\mathrm{Co}}^{\mathit{m}+\mathit{g}}$ reactions using 88.84% enriched $^{61}\mathrm{Ni}$ from threshold up to 18.6 MeV. Thin samples of $^{61}\mathrm{Ni}$ were prepared by electrodeposition on gold foils. The radioactivity of the activation products was determined via high resolution x- and \ensuremath{\gamma}-ray spectrometry. From the measured experimental data isomeric cross-section ratios [${\mathrm{\ensuremath{\sigma}}}_{\mathit{m}}$/${\mathrm{\ensuremath{\sigma}}}_{\mathit{m}+\mathit{g}}$] were deduced. Statistical model calculations taking into account precompound effects were performed for the strong $^{61}\mathrm{Ni}$(p,xn) channels as well as for the weak $^{61}\mathrm{Ni}$(p,\ensuremath{\alpha}) process. The experimental $^{61}\mathrm{Ni}$(p,xn) and $^{61}\mathrm{Ni}$(p,\ensuremath{\alpha}) excitation functions are described well by the calculation over the whole investigated energy range. The isomeric cross-section ratio for the isomeric pair $^{58}\mathrm{Co}^{\mathit{m},}$g formed in the $^{61}\mathrm{Ni}$(p,\ensuremath{\alpha}) process is also reproduced well by the model calculation, provided the input level scheme and the spin distribution are properly taken into account. |
| Databáze: | OpenAIRE |
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