(p, pN) reactions analyzed with the Transfer to the Continuum formalism. The “quenching” puzzle and application to Borromean nuclei.

Tuesday 13 November 2018, 10.00AM

Speaker(s): Mario Gomez Ramos, Sevilla

1 Departamento de FAMN, Facultad de F ́ısica, Universidad de Sevilla,Apdo. 1065, E-41080 Sevilla, Spain

Nucleon removal (p, pN) reactions at intermediate energies (∼100s MeV) have gained renewed attention in recent years as a tool to extract information from exotic nuclei, thanks to the availability of exotic beams with which to perform these reactions in inverse kinematics.

These reactions are expected to be sensitive to deeper parts of the removed-nucleon wave function than knockout reactions with heavier targets, so they are expected to give complementary information to these reactions, regarding the single-particle properties of stable and exotic nuclei.

In particular, campaigns of (p, pN) reactions on chains of oxygen isotopes as well as carbon and nitrogen have been recently performed. One of the main objectives behind these experiments is the analysis of the puzzle of the reduction of the spectroscopic strength. This reduction has been shown to have a strong dependence on isospin asymmetry in heavy-ion knockout reactions. However, this strong dependence has not been reproduced in recent transfer experiments.

As such (p, pN) reactions, thanks to their simplicity are an excellent probe to tip the balance to favour one of these descriptions.

In this work, we analyze all published results from the R3B collaboration using our newly-developed Transfer to the Continuum formalism [1] and we find a small dependence of the reduction or “quenching” factors with isospin asymmetry [2], in accordance with the result from transfer experiments. We study the dependence of the results with the various inputs of the calculation, analyzing their robustness and the more relevant ambiguities.

We also present an extension of the formalism to consider (p, pN) reactions on Borromean systems. In this extension we describe consistently the original Borromean system and the unbound two-body residual core, resulting in a description of the reaction able to provide predictions for the overall cross section as well as the relative weights of the different components. We show results for the (p, pn) reaction on 11Li, and present models able to reproduce experimental data both for this reaction and the transfer reaction 11Li(p, d) 10Li [3,4].

[1] A. M. Moro, Phys. Rev. C 92, 044605 (2015)
[2] M. Gomez-Ramos and A. M. Moro Phys. Lett. B 785, 511 (2018)
[3] M. Gomez-Ramos, J. Casal and A. M. Moro Phys. Lett. B 772, 115 (2017)
[4] J. Casal, M. Gomez-Ramos and A. M. Moro Phys. Lett. B 767, 307 (2017)

Location: P/T 111