Article

Production of heavy actinides from interactions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>16</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>18</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ne</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>20</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ne</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>22</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Cm</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>248</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>

Diana LeeNuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720Hans von GuntenNuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720B. JacakNuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720M. NurmiaNuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720Yuanfang LiuNuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720Cheng LuoNuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720Glenn T. SeaborgNuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720Darleane C. HoffmanNuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

1982lv

ABI

Abstract

We have measured cross sections for the production of isotopes of Bk through No in bombardments of $^{248}\mathrm{Cm}$ with $^{16}\mathrm{O}$, $^{18}\mathrm{O}$, $^{20}\mathrm{Ne}$, and $^{22}\mathrm{Ne}$ ions at energies near the Coulomb barrier. In general, the peak of the mass-yield curve for each element is about two mass units larger for $^{18}\mathrm{O}$ and $^{22}\mathrm{Ne}$ than for $^{16}\mathrm{O}$ and $^{20}\mathrm{Ne}$, reflecting the neutron excess of the projectiles. The production cross sections and maxima of the actinide isotopic distributions are at least as favorable for production of neutron-rich actinides as those measured for irradiation of $^{238}\mathrm{U}$ and $^{248}\mathrm{Cm}$ with very heavy ions. The observation of so many neutron-rich products between the masses of the target and compound nucleus suggests a direct transfer reaction in which the product nuclide is formed with relatively low excitation which minimizes depletion from prompt fission.NUCLEAR REACTIONS $^{248}\mathrm{Cm}$($^{16,18}\mathrm{O}$,$X$), ($^{20,22}\mathrm{Ne}$,$X$) $E(^{16,18}\mathrm{O})=98, 97$ MeV, $E(^{20,22}\mathrm{Ne}=115, 116 \mathrm{MeV})$; measured $\ensuremath{\sigma}$ and isotopic distributions for $Z=97\ensuremath{-}102$.

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Identifiers

DOI: 10.1103/physrevc.25.286

Citations and references

Cited by 20 references

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