Cluster scattering in the non-local model

Abstract

Scattering of weakly bound nuclei with a pronounced cluster structure is strongly affected by their breakup. Usually, this mechanism is accounted for in a three-body model with pairwise potentials. The interaction potentials between complex systems are non-local due to the existence of excitation channels and antisymmetrization. However, a common practice is to use local optical potentials in cluster scattering studies. To assess the validity of replacing non-local optical potentials by their local equivalents, we extend the local-equivalent continuum-discretized coupled-channel (LECDCC) approach proposed by us for deuteron scattering in [Phys. Rev. C98, 011601(R) (2018)] to the case of cluster scattering. We consider the case of ⁶Li + ¹²⁰Sn at 27 and 60 MeV, and compare the angular distributions and reaction cross sections for elastic and breakup cross sections with those obtained in the standard continuum-discretized coupled-channel (CDCC) method with local equivalents of non-local potentials. We found that while elastic scattering is not significantly affected by non-locality, the breakup observables could be affected by up to 20% depending on kinematical conditions of their observation.

1 Introduction

The phenomenon of clustering has been known in nuclear physics for a long time. It is present in most light nuclei where two neutrons and two protons gain from gathering into an α-particle [1]. α-clustering also occurs in even–even N = Z nuclei [2]. A special class of clustering, the halo nuclei, has been found around neutron and proton driplines [3]. More generally, clustering can occur in excited nuclear states close to the thresholds of particle emission channels. It influences cross sections of nuclear reactions involving them. Many such reactions are of importance for stellar nucleosynthesis [4], thus contributing much to shaping the world we live in.

Scattering of weakly bound nuclei with a pronounced cluster structure is at the frontier of modern experimental nuclear research [5, 6]. The information obtained from these studies is affected by the choice of theoretical models used to predict and/or analyze the measured observables. It has been known for a long time that theoretical models should include cluster breakup. To account for this important reaction mechanism, the scattering problem is often described in a three-body model with pairwise interactions, which are always chosen to be local. However, the general Feshbach theory states that interactions between complex systems are non-local [7]: they depend on the inter-nuclear separation both before and after collision. Non-locality comes both from removing the target excitation from consideration and from antisymmetrization between nucleons from both the target and projectile. It most naturally emerges in all ab initio calculations [8]. Therefore, an assessment of validity of replacing non-local optical potentials by their local equivalents in cluster scattering calculations is a timely and vital task needed to correctly understand the uncertainties in observables due to optical potential choices.

We first note that two-body scattering with non-local interactions is very well studied. Phenomenological non-local potentials are often considered in the Perey–Buck model [9], for which the localization procedure has been established [9, 10]. Two-body scattering problems with non-local potentials of a general form can be treated easily by the R-matrix approach with a Lagrange mesh [11]. Many other methods of solving the non-local Schrödinger equation exist, examples of which, as well as references to other works, could be found in [12–14]. The solutions of two-body non-local scattering problems can be used to model wave functions both in the entrance and exit channels of various nuclear reactions when calculating their cross sections. Examples of such calculations are reviewed in [15] for the case of transfer reactions.

Three-body scattering problems with non-local potentials have been extensively studied for the case of three nucleons. They are usually solved either with the help of the Faddeev method [16, 17] or by using hyperspherical harmonics expansions [18, 19]. The Faddeev treatment of non-locality has also been extended to the case of deuteron scattering (d, d), transfer (d, p), and (p, d) reactions from heavy targets [20–22]. It was shown there that using local-equivalent nucleon-target potentials does not reproduce exact non-local calculations. Moreover, including non-locality in nucleon–target potentials significantly improves the description of experimental differential cross sections of these reactions as compared to those obtained in studies with local-equivalent nucleon optical potentials. These findings, together with the rapid development of microscopic models for optical potentials, have motivated the present study.

Modeling cluster scattering with non-local potentials requires a special theoretical technique. The Faddeev approach of [20–22] was applicable to (d, d) and (d, p) reactions because the two-body description of n − A and p − A bound states for the carefully selected target A works well. When applied for cluster scattering, Faddeev approach’s requirement to achieve correct asymptotic conditions in all channels could be unachievable due to the complexity of the problem. In addition, there is no clarity in choosing two-body interaction potentials that would describe simultaneously bound and scattering states in the two-body subsystems. The normalization to unity of the two-body bound states in the Faddeev approach may not correspond to reality. For these reasons, we use the idea of [23], where the continuum-discretized coupled-channel (CDCC) approach [24, 25] was extended to provide an approximate three-body treatment of optical potentials’ non-locality in the n + p + A problem. Following [23], we derive a leading-order local-equivalent continuum-discretized coupled-channel (LECDCC) model for the case of scattering of nuclei with a well-pronounced two-cluster structure. We then compare the LECDCC predictions to those obtained in standard CDCC with local-equivalent potentials. We perform calculations for a popular choice of the projectile, ⁶Li, which is well represented by the α − d cluster structure.

We start by formulating a three-body model for cluster scattering in Section 2, followed by developing LECDCC at the leading order in Section 3. In Section 4, we apply the formalism to the case of ⁶Li + ¹²⁰Sn scattering using non-local Sao Paulo potentials [26–28] comparing LECDCC with traditional CDCC, in which local-equivalent potentials are used. Section 5 summarizes the work undertaken and draws conclusion. Appendix provides additional mathematical details relevant to formalism development.

2 Three-body model for cluster scattering

Let us consider scattering of the nucleus C composed by two clusters C₁ and C₂ from the target A. We assume that this problem can be well-described by the three-body wave function Ψ(r, R), which depends on coordinates and , shown in Figure 1. We also assume that the interaction between any pair c of nuclei, chosen from C₁, C₂, and A, is described by a two-body Schrödinger equation:with non-local nuclear potential and the local Coulomb interaction . The three-body Schrödinger equation in this case is written as follows (see Appendix for derivation):where T_r and T_R are the kinetic energy operators associated with the coordinate r and R, respectively, E = E₃ − E_c.m., where E₃ is the three-body energy in the laboratory system, while γ₁ = C₂/(C₁ + C₂), γ₂ = C₁/(C₁ + C₂), and μ_c = CA/(C + A). The two Jacobians areWe will assume for simplicity that the clusters and targets have zero spin. The three-body Schrödinger Eq. 2 is solved within the CDCC framework using the expansionwhere ϕ_i is the C₁ − C₂ bound state wave function or a continuum bin, obtained in the non-local C₁ − C₂ model and χ_i is the wave function of the relative motion of the bin i with respect to the target A. It satisfies the equationwhere U_C is the local C − A Coulomb potential and

FIGURE 1

In this paper, we will consider phenomenological non-local potentials in each pair c choosing them in the Perey–Buck form [9],where x = r − r′ and X = (r + r′)/2, andwhere β is the range of non-locality.

Usually, the non-locality range β for nucleon scattering is around 0.85–0.9 fm; for deuterons, it is fm, and for α-particles, it is fm. This is because in most cases, the clusters C₁ and C₂ are not the same, and different non-locality ranges are required in each pair c. Moreover, non-local potentials themselves could be represented by several terms of the Perey–Buck type with different non-locality ranges, such as in the non-local dispersive optical model (NLDOM) in [29]. Therefore, we consider pairwise potentials given bywhere the index c is associated with a chosen pair of nuclei (clusters) and j is associated with a non-locality range β_j. When dealing with potentials (9), we use the experience of handling NLDOM potentials in constructing the local-equivalent adiabatic model for (d, p) reactions from Ref. [30].

3 Leading-order local-equivalent CDCC

Our aim is to find an equivalent local potential model that gives the same scattering phase shifts as the non-local model (18) does. We will follow Refs. [23, 31] to perform this. We will exploit the fact that the non-locality ranges are small. To simplify the R.H.S. of Eq. 6, we use the Perey–Buck presentation (7) of the non-local potentials and . After introducing a new variable, associated with cluster i,Equation 5 can be rewritten aswhereIn previous d + A studies [30, 31], the following step was the introduction of a new variable and neglecting s/(A+ 2) in the arguments of U_nA and U_pA potentials. However, a similar strategy would result in the appearance of in the arguments of these potentials. In the case of C₂ ≠ C₁, this term could be important, especially for scattering of one-nucleon halo nuclei such as ¹¹Be or ¹⁵C. Therefore, a different strategy is adopted here. In the term associated with cluster C₁, a new variable is introduced. In the term associated with cluster C₂, the integration variable r is replaced by −r, followed by the introduction of . It giveswhereBecause of the short range of H_j(s), the wave function can be represented by the leading-order expansion that retains only spherical components in s (see [31]):in whichwhere μ is the reduced mass of A + C (not to be confused with dimensionless reduced mass number μ_C of the previous section). Then, the coupled system of equations takes the formwhereEquation 18 could be rewritten in the following form:Then, imposing the requirement that the local-equivalent coupling potentials satisfywe obtain a system of the transcendental matrix equationsforin which . The system of Eq. 22 could be solved using the Newton method, as was solved in [23], and then, could be read into a CDCC reaction code such as FRESCO [32]. The continuum bins can have different values of orbital momentum. The partial wave decomposition of for general orbital momentum for cluster scattering is presented in Appendix.

4 Application to ⁶Li scattering

We apply the aforementioned formalism to ⁶Li+¹²⁰Sn scattering at two ⁶Li incident energies, 27 MeV and 60 MeV, near and above the Coulomb barrier, respectively. ⁶Li has a well-developed α − d cluster structure due to its small deuteron separation energy of 1.47 MeV. Since a non-local potential for α-d scattering is not available, to describe the continuum states of the ⁶Li projectile, we used a local model with the same potential as in [33] to generate α-d continuum bins. This model describes the α-d s-wave phase shifts and reproduces the experimental excitation energy and width of the 3⁺ resonance (E* = 2.186 MeV) of ⁶Li. The ⁶Li+¹²⁰Sn study around the Coulomb barrier in [33] has shown that this low-energy resonance in the d-wave continuum plays an important role. Therefore, the CDCC expansion considered a basis with l_αd = 0 and 2. For the d-wave component, the continuum wave functions were weighted by the T-matrix in order to better describe the resonance [32]. The calculations have been performed, ignoring the spin of the deuteron.

To calculate the couplings potentials U_ii′(R), we used six bins for each α-d partial wave, which was deemed sufficient. The maximum α-d energy E_αd was 30 MeV for the calculation at 60 MeV since the contribution of the last bin to the breakup cross section was very small. As for the calculation at 27 MeV, the maximum value of only 6 MeV was possible due to instability of calculations with higher E_αd. Variations of the maximum of E_αd lead to differences in the elastic cross section of less than 4% in the whole angular range. Convergence of the cross sections was reached by varying the matching radius R_m and maximum total angular momentum J. The optimal value R_m = 150 fm was obtained for both ⁶Li incident energies, while the maximum total angular momentum J was 300 and 100 for ⁶Li energies of 60 and 27 MeV, respectively.

For α-¹²⁰Sn and d-¹²⁰Sn optical potentials, we used the Sao Paulo potential (SPP) [26–28]. This potential is given by Eqs 7, 8 with the non-locality parameter β = 4ℏ/(μ_Cc), chosen the same as in [28]. The SPP uses for U_i(X) the double-folding model both for real and imaginary parts, assuming that they are proportional. The two-point Fermi distribution [28] was chosen for model density of ¹²⁰Sn. The deuteron density was taken from the systematics found in [28], while that for the α-particle was a sum of Gaussians taken from [34]. For the imaginary part, we used the standard renormalization coefficient 0.78. The local-equivalent potential of SPP (LESPP) is obtained by solving the transcendental equation [28]The solution is energy-dependent. All three-body models employing optical potentials use them only at a chosen fixed energy equal to a certain fraction of the projectile energy E. For example, in d − A scattering, this would be half the incoming deuteron energy for nucleon–target potential. For cluster scattering, the fixed energy of the C_i − A potential is proportional to its mass, . We compare the standard CDCC calculations with LESPP to those obtained in LECDCC developed in this work. We made sure that for β → 0, they coinside with standard local folding potential calculations when breakup is neglected.

Figure 2 shows selected coupling potentials calculated in standard CDCC with LESPP and in LECDCC. The and couplings, shown in Figures 2A, B for ⁶Li incident energies of 27 and 60 MeV, respectively, are very similar in the surface region, around R ≈ 8–12 fm. At R = 0 fm, their real parts differ by 4% at 27 MeV and by 19% at 60 MeV, but imaginary parts of are more than twice smaller than those of . A similar situation occurs for diagonal couplings between d-wave bin states with the first 2⁺ resonance (see Figure 2C). We have only plotted it for the ⁶Li energy of 60 MeV because the differences there are expected to be higher. Non-diagonal couplings between these states, and , are also very similar at the surface. However, the difference in the internal region is more significant.

FIGURE 2

Despite a significant difference in the coupling potentials U_ii′(R) within the short range of the optical potentials, the elastic scattering angular distributions calculated in LECDCC turned out to be very similar to those obtained in standard CDCC with LESPP. Therefore, we only show their ratio in Figure 3. For an incident energy of 27 MeV, the difference between the two approaches does not exceed 4% in the whole angular range. At 60 MeV, numerical noise has not allowed us to unambiguously determine this ratio at angles larger than 90°. Below 90°, the difference between LECDCC and LESPP does not exceed 8%. We also observe some oscillations in the LECDCC/LESPP ratio, resulting from tiny oscillations in both these differential cross sections, which are slightly out of phase. These oscillations are caused by a small near-far-side interference, which results in a small Fraunhofer diffraction pattern.

FIGURE 3

The breakup cross sections are more strongly influenced by non-locality. The differential s-wave, d-wave, and total breakup cross sections are shown in Figure 4. One can see that these cross sections are dominated by the d-wave breakup and that treating non-locality at the leading order in CDCC increases these cross sections. At an incident energy of 27 MeV, this increase is most noticeable at the main peak around 40°, while at 60 MeV, the increase occurs at most angles. The LECDCC/LESPP ratio for angle-integrated breakup cross sections is shown in Figure 5 as a function of bin energy. One can see that the non-locality effect can reach 20% in the breakup cross sections for both incident energies for higher energy bins. Since this effect is bin-dependent, it is possible that the non-locality effect can strongly depend on kinematic conditions of breakup observation.

FIGURE 4

FIGURE 5

Finally, we found that the total breakup cross sections σ_bu and reaction cross sections σ_reac are less affected by non-local effects. These cross sections are collected in Table 1, showing about 0.1% difference in σ_reac between LESPP and LECDCC calculations. For σ_bu, this difference is 3% and 5% for 27 and 60 MeV, respectively.

The non-local effects in ⁶Li elastic scattering turned to be much smaller than those associated with deuteron scattering — the simplest nucleus with a cluster structure. We have identified the reason why this happens, which is the Coulomb barrier (for smaller angles) and strong absorption that make the reaction mechanism less sensitive to the interactions in the nuclear interior. Since both LESPP and LECDCC potentials are very similar at the surface, the cross sections should be similar as well. We repeated both calculations reducing the imaginary part by 50% for an ⁶Li incident energy of 60 MeV. The difference between LESPP and LECDCC has increased to 20% at 60° and become an order of magnitude greater after 100°. However, the elastic cross sections in this angular range are small. The difference in breakup cross sections exceeded 20% after E_αd = 5 MeV. The angular distribution for the breakup cross section also presents larger differences with a reduced absorption, of ∼10%–20% for small angles and larger than 50% for angles larger than 60°. The difference in reaction cross sections remains small.

5 Summary and conclusion

To assess the validity of a standard approach which replaces non-local optical potentials by their local equivalents in cluster scattering calculations, we developed a leading-order method to include the non-locality of pairwise optical potentials into a three-body Hamiltonian describing cluster scattering. This resulted in a coupled system of transcendental equations for local-equivalent coupling potentials that could be fed into standard CDCC equations. The application to ⁶Li +¹²⁰Sn scattering at the incident energy of 27 and 60 MeV has shown that elastic scattering is not much affected by non-locality, while breakup cross sections in some kinematical regions could increase the differential cross sections up to 20%.

Both elastic and breakup observables are determined by scattering phase shifts in all CDCC channels, which determine asymptotics of the channel wave functions. The LECDCC has been constructed to provide phase-equivalent solutions to non-local problems. At small distances, the LECDCC local CDCC channel functions should differ more strongly from each other. Therefore, the cross sections of other reactions that are more sensitive to internal parts of the three-body wave function than the projectile breakup, such as transfer reactions, could be more affected by the non-locality.

Using non-local optical potentials to describe various nuclear reactions induced by nuclei with the pronounced cluster structure requires further development of techniques to solve the three-body Schrödinger equation. For such reactions, beyond-leading-order effects could be very important. It is well-known that in the region of strong nuclear interaction, a two-body scattering wave function, obtained in a non-local model, is smaller than that obtained in the leading-order local-equivalent model by a quantity called the Perey factor [35]. The Perey factor also appears in the three-body model with velocity-dependent potentials [36]. However, incorporating the Perey effect into the LECDCC scheme is not easy. Therefore, it would make sense to try solving the non-local CDCC exactly. The obstacle on this path is the absence of formalism for non-local CDCC couplings. The easiest way to develop such formalism is to extend the non-local adiabatic model proposed for (d, p) in [37], but it would be applicable only to non-localities of the Perey–Buck type. Optical potentials coming from ab initio calculations have a more complicated structure, and including them into the CDCC approach requires a major effort, which will become an important task for future research.

Finally, this paper considered only the processes in which the target A was not excited. Many experiments with weakly bound projectiles involve nuclei, both the target and projectile, with low-lying excited states that play an important role in the reaction mechanism. It has just been demonstrated that using non-local optical potentials with core excitation achieves a considerably more successful description of the experimental data on (d, p) reactions as compared to previous studies with local potentials [38]. When nuclear excitations are explicitly included in coupled-channel calculations, the imaginary part that describes absorption is usually reduced. One can expect that non-local effects could be stronger in coupled-channel calculations with reduced absorption. The LECDCC introduced here could be readily extended to include core excitations to study these effects.

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