Reaction channel contributions to the triton optical potential

2021

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“…In a study of the pickup contribution to the 3 H OMP for 33 MeV 3 H on 48 Ca, we found R CS = 0.55, Ref. [29]. For 33 MeV 3 He on 48 Ca, we found R CS = 0.71 [28].…”

Section: Regularities In R Csmentioning

confidence: 73%

Reaction channel contributions to proton scattering at 65 MeV

2021

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“…The state CS is not necessarily equal to the change in reaction cross section (CS) and the relationship between the two can vary widely, Refs. [2,14,15], depending on the particular case. In cases where inelastic coupling is included together with reaction channel coupling [2,14,15], the relation between (CS) and State CS is quite different for pickup and inelastic collective coupling.…”

Section: Evaluating the Dppsmentioning

confidence: 99%

“…[2,14,15], depending on the particular case. In cases where inelastic coupling is included together with reaction channel coupling [2,14,15], the relation between (CS) and State CS is quite different for pickup and inelastic collective coupling. Various relationships have emerged for different cases and to facilitate comparisons, we present values of R CS defined as the ratio of (CS) to State CS.…”

Section: Evaluating the Dppsmentioning

confidence: 99%

“…In all cases in the present work, the increase in the reaction cross section exceeds the cross section to the pickup state or states. It seems that the pickup channels behave as a doorway to other processes [2,15].…”

Section: Evaluating the Dppsmentioning

confidence: 99%

“…The present cases are all such that CS (the change in reaction cross section) is much greater than the corresponding State CS, see Refs. [2,15] for a discussion of this. In the present case, comparison of CS values in lines 3 and 4 of Table I and also in lines 6 and 7 reveals that the increase in reaction CS when states are included together is somewhat less than the sum of CS values when both sets of states are not included.…”

Section: E Other Evidence Of Dynamical Nonlocalitymentioning

confidence: 99%

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Reaction channel contributions to the proton +Pb208 optical potential at 40 MeV

2022

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Reaction channel contributions to the triton + Pb208 optical potential

2023

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Background: Well-established coupled channel and coupled reaction channel (CRC) processes make contributions to elastic scattering that are not included in standard folding models of the optical model potential (OMP). Such contributions have been established for 3 He interacting with 208 Pb but the corresponding contributions for 3 H are expected to be different, particularly for pickup coupling. Purpose: To establish and characterize the contribution to the interaction potential between 3 H and 208 Pb that is generated by coupling to proton pickup (outgoing 4 He) channels; also to study the contribution of collective states and identify effects of dynamical nonlocality due to these couplings. Methods: CRC calculations, including coupling to collective states, will provide the elastic channel S-matrix S l j resulting from the included processes. Inversion of S l j will produce the local potential that yields, in a single channel calculation, the elastic scattering observables from the coupled channel calculation. Subtracting the bare potential from the inverted CRC potential yields a local and l-independent representation of the dynamical polarization potential (DPP). From the DPPs due to a range of combinations of channel couplings, the influence of dynamically generated nonlocality can be identified. Results: Coupling to 4 He channels makes a smaller contribution to the 3 H interaction than it does for incident 3 He. On the other hand coupling to inelastic channels makes a greater contribution than it does for 3 He. The nonadditivity of the DPPs implies their dynamical nonlocality. Conclusions: The DPPs established here challenge the notion that folding models, in particular local density models, provide a satisfactory description of elastic scattering of 3 H from nuclei. Coupling to proton pickup channels induces dynamical nonlocality in the 3 H OMP with implications for direct reactions involving 3 H. Departures from a smooth radial form for the 3 H OMP should be apparent in high quality fits to suitable elastic scattering data. Future theories of the interaction of 3 H with nuclei should include some representation of outgoing 4 He.