Статья

Excitation functions for 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">Ca</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>40</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">Ca</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>48</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>ions 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>

Darleane C. HoffmanIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545M. M. FowlerIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545W. R. DanielsIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545H. R. von GuntenIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545Diana LeeIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545K. J. MoodyIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545Κ. Ε. GregorichIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545Robert B. WelchIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545G. T. SeaborgIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545W. BrüchleIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545M. BrüggerIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545H. W. GäggelerIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545M. SchädelIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545K. SümmererIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545G. WirthIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545Th. BlaichIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545G. HerrmannIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545N. HildebrandIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545J. V. KratzIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545Martin LerchIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545N. TrautmannIsotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

1985lv

ABI

Аннотация

Excitation functions have been measured for production of isotopes of Bk through Fm in bombardments of $^{248}\mathrm{Cm}$ with 234- to 294-MeV $^{40}\mathrm{Ca}$ ions and with 239- to 318-MeV $^{48}\mathrm{Ca}$ ions. The maxima of the isotopic distributions for these elements occur at only 2 to 3 mass numbers larger for $^{48}\mathrm{Ca}$ than for $^{40}\mathrm{Ca}$ reactions. The shapes of the distributions and the half-widths of about 2.5 mass numbers are quite similar to those observed previously for reactions of $^{16}\mathrm{O}$, $^{18}\mathrm{O}$, $^{20}\mathrm{Ne}$, and $^{22}\mathrm{Ne}$ with $^{248}\mathrm{Cm}$. In general, the excitation functions for $^{40}\mathrm{Ca}$ show maxima near the Coulomb barrier while those for $^{48}\mathrm{Ca}$ are about 20 MeV above the barrier. The cross sections decrease rather slowly with increasing projectile energy over the energy range studied, indicating that the additional projectile energy is not manifested as excitation energy of these actinide products.

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Идентификаторы

DOI: 10.1103/physrevc.31.1763

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