Energy-Level Structure of Ca41 from the Ca40(d, p)Ca41 Reaction

Abstract

The level structure of the nucleus ${\mathrm{Ca}}^{41}$ has been studied by the ${\mathrm{Ca}}^{40}(d, p){\mathrm{Ca}}^{41}$ reaction at an incident deuteron energy of 7.00 MeV. Angular distributions have been measured for 120 levels below an excitation energy of 6.83 MeV, and those levels showing forward-stripping angular distributions have been analyzed using the distorted-wave Born approximation. Results on excitation energies, captured-neutron orbital angular momenta, and transition strengths are given for these levels. The data were further analyzed in terms of the shell model, and the unperturbed single-particle level positions with their corresponding spectroscopic factors were determined. For the ($1f_{\frac{7}{2}}$) single-particle level at $E_x=0.0\mathrm{}$ MeV, $S=1.0\mathrm{}$; ($2p_{\frac{3}{2}}$), $E_x=2.07\mathrm{}$ MeV, $S=1.22\mathrm{}$; ($2p_{\frac{1}{2}}$), $E_x=4.13\mathrm{}$ MeV, $S=1.17\mathrm{}$; ($1f_{\frac{5}{2}}$), $E_x=5.50\mathrm{}$ MeV, $S=0.48\mathrm{}$; ($1g_{\frac{9}{2}}$), $E_x>~4.98$ MeV, $S=0.07\mathrm{}$; ($2d_{\frac{5}{2}}$), $E_x>6.8\mathrm{}$ MeV, $S=0.15\mathrm{}$; and ($3s_{\frac{1}{2}}$), $E_x>6.8\mathrm{}$ MeV, $S=0.05\mathrm{}$. The possible role of ($1d_{\frac{3}{2}}$) and ($2s_{\frac{1}{2}}$) shell-model hole states is also discussed.