Phys.Rev. C 92, 054617 (2015)

T.A.Werke, D.A.Mayorov, M.C.Alfonso, E.E.Tereshatov, C.M.Folden, III

Hot fusion-evaporation cross sections of ⁴⁴Ca-induced reactions with lanthanide targets

NUCLEAR REACTIONS ¹⁵⁸Gd(⁴⁴Ca, 3n), (⁴⁴Ca, 4n), (⁴⁴Ca, 5n), (⁴⁴Ca, 6n), E=177.6, 184.2, 185.7, 188.4, 191.3, 196.0; ¹⁵⁹Tb(⁴⁴Ca, 3n), (⁴⁴Ca, 4n), (⁴⁴Ca, 5n), (⁴⁴Ca, 3np), (⁴⁴Ca, 4np), (⁴⁴Ca, 5np), E=184.7, 189.8, 196.3, 200.5, 208.0; ¹⁶²Dy(⁴⁴Ca, 3n), (⁴⁴Ca, 4n), (⁴⁴Ca, 5n), (⁴⁴Ca, 2np), (⁴⁴Ca, 3np), (⁴⁴Ca, 4np), (⁴⁴Ca, 5np), E=183.7, 188.9, 195.4, 199.5, 207.1; measured reaction products, σ(E) using Momentum Recoil Achromat Spectrometer (MARS) at Cyclotron Institute of Texas A and M University. Comparison with theoretical model calculations with and without consideration of collective enhancements to level density (CELD), and with experimental σ(E) for ⁴⁵Sc induced reactions on the same targets; deduced little evidence for cross-sectional enhancement due to shell stabilization of compound nucleus.

RADIOACTIVITY ^197,198Po(α)[from ¹⁵⁸Gd(⁴⁴Ca, 5n), (⁴⁴Ca, 4n), E≈5 MeV/nucleon]; ¹⁹⁹At, ^199mPo(α)[from ¹⁵⁹Tb(⁴⁴Ca, 4n), (⁴⁴Ca, 3np), E≈5 MeV/nucleon]; ²⁰²Rn, ²⁰²At(α)[from ¹⁶²Dy(⁴⁴Ca, 4n), (⁴⁴Ca, 3np), E≈5 MeV/nucleon]; Measured Eα, and T_1/2 of ¹⁹⁹At, ²⁰²Rn decays. Comparison with evaluated data in the chart of nuclides on NNDC webpage.

doi: 10.1103/PhysRevC.92.054617