Measurement of the 25Al(d,n)26Si\mathrm{^{25}Al(d,n)^{26}Si} reaction and impact on the 25Al(p,γ)26Si\mathrm{^{25}Al(p,\gamma)^{26}Si} reaction rate

The $\mathrm{^{25}Al(p,\gamma)^{26}Si}$ reaction is part of a reaction network with impact on the observed galactic $^{26}$Al abundance. A new determination of the proton strength of the lowest $\ell=0$ proton-resonance in $^{26}$Si is required to more precisely calculate the thermal reaction rate. To this end, the $\mathrm{^{25}Al(d,n)^{26}Si}$ proton-transfer reaction is measured in inverse kinematics using an in-flight radioactive beam at the RESOLUT facility. Excitation energies of the lowest $^{26}$Si proton resonances are measured and cross sections are determined for the lowest $\ell=0$ resonance associated with the $3^{+}_{3}$ state at 5.92(2) MeV. Coupled reaction channels (CRC) calculations using FRESCO are performed to extract the $\ell=0$ spectroscopic factor for the $3^{+}_{3}$ state. The proton width for the $3^{+}_{3}$ state in $^{26}$Si is determined to be $\Gamma_{p}$=2.19(45) eV and the $(p,\gamma)$ resonance strength for the $3^{+}_{3}$ state is extracted as 26(10) meV. This resonance dominates the $\mathrm{^{25}Al(p,\gamma)^{26}Si}$ reaction rate above 0.2 GK.Comment: 8 pages, 7 figure

Fusion enhancement at near and sub-barrier energies in 19^{19}O + 12^{12}C

Measuring the fusion excitation function for an isotopic chain of projectile nuclei provides a stringent test of a microscopic description of fusion. We report the first measurement of the fusion excitation function at near-barrier energies for the $^{19}$O + $^{12}$C system. The measured excitation function is compared with the fusion excitation function of $^{18}$O + $^{12}$C. A significant enhancement in the fusion probability of $^{19}$O ions with a $^{12}$C target as compared to $^{18}$O ions is observed. The experimental cross-sections observed at near-barrier energies are compared with a state-of-the-art microscopic model

One- and two-nucleon transfer in the <SUP>28</SUP>Si+<SUP>68</SUP>Zn system at energies below the Coulomb barrier

Excitation functions for one- and two-nucleon transfer in <SUP>28</SUP>Si+<SUP>68</SUP>Zn system have been measured at energies below the Coulomb barrier. The experiment was carried out by detecting the forward recoiling targetlike nuclei using the recoil mass separator, HIRA. With a pulsed beam, the time-of-flight of the recoils was measured and used to resolve the M/q ambiguity. This enabled the determination of the two-nucleon transfer yields. The role of one- and two-nucleon transfer in the sub-barrier fusion cross-section enhancement has been investigated. It turns out that the coupling of the positive Q-value two-neutron transfer channel results in a significant contribution to the enhancement. Coupling to both the transfer and the inelastic channels is able to explain the observed enhancement