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arxiv: 2605.16533 · v1 · pith:HCB7CYB3new · submitted 2026-05-15 · ⚛️ nucl-th

One- and two-nucleon transfer in ¹¹⁶Sn+⁶⁰Ni: A coupled reaction channel analysis

Pith reviewed 2026-05-19 21:30 UTC · model grok-4.3

classification ⚛️ nucl-th
keywords heavy ion collisionsnucleon transfercoupled reaction channelsshell modelspectroscopic amplitudesdouble folding potentialquasielastic scatteringtwo-nucleon transfer
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0 comments X

The pith

Microscopic coupled reaction channel calculations reproduce one- and two-nucleon transfer data in the 116Sn + 60Ni system without arbitrary normalization of cross sections.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper performs a detailed CRC study of the 116Sn + 60Ni heavy-ion system to examine quasielastic scattering together with one- and two-nucleon transfer channels. It employs microscopic double-folding São Paulo potentials and incorporates all relevant inelastic and transfer couplings selected according to observed gamma-ray transitions. One-nucleon spectroscopic amplitudes are taken from large-scale shell-model calculations, while two-nucleon transfer is tested through sequential, microscopic-cluster, and extreme-cluster routes. The calculations achieve close agreement with measured probabilities for quasielastic scattering and one-neutron transfer, with one-proton transfer best matched by experimental amplitudes and two-nucleon transfer best matched by the extreme-cluster picture. This demonstrates that a fully microscopic treatment of these processes is possible inside the CRC framework.

Core claim

The central claim is that microscopic CRC calculations using double-folding São Paulo potentials, guided by observed γ-ray transitions and shell-model spectroscopic amplitudes, successfully describe quasielastic scattering, one-neutron transfer, one-proton transfer, and two-nucleon transfer in the 116Sn + 60Ni system without any arbitrary scaling of the cross sections, with the extreme cluster mechanism providing the best description of the two-nucleon data.

What carries the argument

Microscopic coupled reaction channel (CRC) framework with double-folding São Paulo potentials and spectroscopic amplitudes obtained from large-scale shell-model calculations.

If this is right

  • Quasielastic scattering and one-neutron transfer probabilities match the measured values without adjustment.
  • One-proton transfer is best reproduced when experimental spectroscopic amplitudes are used.
  • Two-nucleon transfer data are best described by the extreme cluster mechanism.
  • Microscopic CRC calculations can be carried out for heavy-ion transfers without recourse to arbitrary normalization factors.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same microscopic approach could be applied to other heavy-ion pairs to generate predictions for unmeasured transfer channels.
  • Larger shell-model spaces made possible by increased computing power would allow systematic checks on the sensitivity of the results to truncation.
  • Success here suggests that similar CRC treatments may eventually reduce the need for phenomenological scaling in reaction models used for astrophysical nucleosynthesis networks.

Load-bearing premise

All important inelastic and transfer couplings are captured by the observed gamma-ray transitions and the shell-model spectroscopic amplitudes remain sufficiently accurate even with the practical limit on the number of included states.

What would settle it

High-precision measurements of additional transfer or inelastic channels that deviate substantially from the CRC predictions while the same potentials and couplings are retained.

Figures

Figures reproduced from arXiv: 2605.16533 by Chandra Kumar, S. Nath.

Figure 1
Figure 1. Figure 1: FIG. 1. Overlaps of the Ni-like and the Sn-like nuclei consid [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Quasielastic scattering excitation function for th [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Comparison between the experimental (filled circles [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Comparison between the experimental (filled circles [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Comparison between the experimental (filled squares [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Comparison between the experimental (filled squares [PITH_FULL_IMAGE:figures/full_fig_p010_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Theoretical 1 [PITH_FULL_IMAGE:figures/full_fig_p010_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. The effect of coupling to different indirect paths [PITH_FULL_IMAGE:figures/full_fig_p011_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Absorption effects in (a) 1 [PITH_FULL_IMAGE:figures/full_fig_p012_9.png] view at source ↗
read the original abstract

Recent studies of multi-nucleon transfer in heavy ion collisions have employed both macroscopic and microscopic models. Although macroscopic approaches offer useful insights, microscopic analyses of high-precision experimental data provide a more reliable framework for understanding the nucleon transfer mechanisms. The present study aims to carry out a comprehensive theoretical investigation of the $^{116}$Sn+$^{60}$Ni system using microscopic coupled reaction channel (CRC) calculations. The calculations employ microscopic double-folding S$\tilde{a}$o Paulo potentials, incorporating all relevant inelastic and transfer couplings guided by observed $\gamma$-ray transitions, wherever available. For the one-nucleon transfer channels, spectroscopic amplitudes are also obtained from large-scale shell-model calculations. In the case of two-nucleon transfer, sequential, microscopic cluster and extreme cluster mechanisms are considered to reproduce the data. Results for quasielastic scattering and one-neutron ($1n$) transfer show excellent agreement with experimental data. Measured one-proton ($1p$) transfer probabilities are best described by incorporating experimental spectroscopic amplitudes in the CRC calculations. For transfer of two-nucleons, the extreme cluster mechanism is found to best reproduce the data. This study highlights that microscopic description of one- and two-nucleon transfer between two heavy ions in the CRC framework, without taking recourse to arbitrary normalization of the cross sections, is quite feasible. Nonetheless, lack of experimental corroboration for all the transitions included in the calculations and practical limits of computational resources, affecting accuracy of shell-model results and causing a cap on the number of states, leave room for further refinement of the results.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 1 minor

Summary. The manuscript presents coupled reaction channel (CRC) calculations for quasielastic scattering and one- and two-nucleon transfer in the 116Sn + 60Ni system using microscopic double-folding São Paulo potentials. Spectroscopic amplitudes for one-nucleon transfers are taken from large-scale shell-model calculations or experiment, while two-nucleon transfers consider sequential, microscopic cluster, and extreme cluster mechanisms. All relevant inelastic and transfer couplings are included based on observed γ-ray transitions. The calculations achieve excellent agreement with data for quasielastic and 1n channels, best describe 1p data with experimental amplitudes, and favor the extreme cluster mechanism for 2n transfer, all without arbitrary overall normalization of cross sections. The authors conclude that fully microscopic CRC descriptions of these processes are feasible, while noting limitations from incomplete experimental data and computational caps on shell-model states.

Significance. If the absolute-scale agreement holds under more complete calculations, the work demonstrates that microscopic inputs (shell-model spectroscopic amplitudes plus São Paulo folding) can yield parameter-free predictions for heavy-ion transfer cross sections in the CRC framework. This is a notable advance over approaches that routinely introduce overall normalization factors, and the identification of the extreme cluster mechanism for 2n transfer provides a concrete, testable preference among competing two-nucleon mechanisms. The explicit inclusion of couplings guided by γ data and the absence of free scaling parameters strengthen the reliability of the extracted physics.

major comments (1)
  1. [Abstract] Abstract: The central claim that microscopic CRC calculations reproduce the data in absolute scale without arbitrary normalization rests on the accuracy of the truncated shell-model spectroscopic amplitudes. The manuscript itself flags that computational limits cap the number of included states and that not all transitions have experimental corroboration; if omitted higher-lying states carry appreciable strength, the absolute magnitudes would shift and the no-normalization result could require re-examination.
minor comments (1)
  1. [Abstract] The São Paulo potential is denoted with an unusual tilde in the abstract (S$tilde{a}$o); this should be corrected to the standard São Paulo notation for clarity.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the positive evaluation and the constructive comment on the abstract. We address the point below and will incorporate a revision to strengthen the presentation of our caveats.

read point-by-point responses
  1. Referee: [Abstract] Abstract: The central claim that microscopic CRC calculations reproduce the data in absolute scale without arbitrary normalization rests on the accuracy of the truncated shell-model spectroscopic amplitudes. The manuscript itself flags that computational limits cap the number of included states and that not all transitions have experimental corroboration; if omitted higher-lying states carry appreciable strength, the absolute magnitudes would shift and the no-normalization result could require re-examination.

    Authors: We agree that the absolute-scale agreement depends on the completeness of the included shell-model states. The manuscript already notes the computational truncation and incomplete experimental corroboration both in the abstract and in the concluding discussion. To make this caveat more prominent in the central claim, we will revise the abstract to state explicitly that the calculations achieve good agreement without normalization using the presently accessible shell-model space, while underscoring that additional higher-lying states could modify the absolute magnitudes. This change will temper the wording without altering the demonstrated feasibility of the microscopic CRC approach. revision: yes

Circularity Check

0 steps flagged

No circularity: absolute cross sections follow from independent shell-model amplitudes and São Paulo potentials

full rationale

The derivation computes CRC cross sections from microscopic double-folding São Paulo potentials plus spectroscopic amplitudes taken from separate large-scale shell-model calculations (or experiment for 1p). No overall normalization factor is introduced or fitted; the reported agreement with data is therefore an output of those external inputs rather than a quantity defined or adjusted to match the target observables. Selection among sequential, microscopic-cluster, and extreme-cluster mechanisms for 2n transfer is ordinary model comparison, not a reduction of the central claim to its own fitted parameters. Acknowledged limits on basis size and missing experimental corroboration affect predictive robustness but do not create a self-definitional or self-citation loop inside the reported chain.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The analysis rests on standard nuclear reaction theory and established microscopic models; no new free parameters or invented entities are introduced beyond those already present in the São Paulo potential and shell-model frameworks.

axioms (2)
  • domain assumption The microscopic double-folding São Paulo potential accurately describes the core interaction between the nuclei.
    Used as the base potential for all CRC calculations.
  • domain assumption Large-scale shell-model calculations supply reliable spectroscopic amplitudes for one-nucleon transfers.
    Employed for 1n and 1p channels where experimental values are unavailable.

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