Two-nucleon T = 0 transfer reactions in the 0p shell

Stretched states inB12,13with the(d,α)reaction

“…The angular distributions from the present data may be compared with those from the 16 O(d, α) 14 N reaction measured by van der Woude and de Meijer at E d =20 MeV/nucleon [6]. In that case, the angular distribution for the 1 + state at 3.95 MeV, which would correspond to the transition to the 12 B ground state, was fit dominantly by ℓ=0 transfer with a secondary maximum at an angle very similar to that for the peak in the 14 for 14 N and 12 B are also very similar for similar angle ranges.…”

“…It has been known for many years that the (d, α) and (α, d) reactions are highly selective [1][2][3][4][5][6]. This selectivity emerges from a combination of nuclear structure and kinematic considerations and favors the removal or addition of two nucleons in the same shell-model orbit with their angular momenta completely aligned in the J=2j state.…”

“…For example, Rivet et al [2] and Lu et al [3] made assignments for (0d 2 5/2 ) 5 + and (0f 2 7/2 ) 7 + states in nuclei from 14 N to 42 Sc populated in the (α, d) reaction, clearly demonstrating this effect. In the p shell, Van residual nuclei [6]. While extremely useful, these properties of deuterontransfer reactions have not yet been utilized with the more exotic nuclei accessible with rare-isotope beams.…”

“…5 represent a calculation assuming a single-step direct pair transfer reaction performed using the code PTOLEMY. The deuteron optical-model parameters are the same as those used in [14,15], and the alpha-particle parameters are from [6]. It is known that the angular distributions for two-nucleon transfer can be difficult to reproduce with distorted-wave Born approximation (DWBA) calculations [4,6,21].…”

“…The deuteron optical-model parameters are the same as those used in [14,15], and the alpha-particle parameters are from [6]. It is known that the angular distributions for two-nucleon transfer can be difficult to reproduce with distorted-wave Born approximation (DWBA) calculations [4,6,21]. These calculations are intended only to display qualitative indications of the approximate shapes to be expected from direct deuteron transfer with a single ℓ value.…”