17-21 July 2017
Santiago de Compostela, Facultade de Química
Europe/Madrid timezone

Proton-neutron pairing studied with transfer reactions

17 Jul 2017, 17:55
Aula Química Física (Facultade de Química (USC))

Aula Química Física

Facultade de Química (USC)

Nuclear Physics Nuclear Physics I


Mr. Lay Valera José Antonio (Universidad de Sevilla)


Pairing correlations in nuclei is one of the most active fields in Nuclear Physics. It is crucial for understanding different processes and characteristics of nuclei such us superfluidity. We can easily found clear situations where neutrons form strongly correlated pairs with total angular momentum J=0 and isospin T=1. This produces a strong enhancement of two-neutron transfer reactions, thus being the main probe to test correlations. In N=Z nuclei one would expect to observe also a strong correlation between neutrons and protons. Here, we can find isovector pairs with J=0; T=1 but also isoscalar ones with J=1; T=0. However, the existence and magnitude of pn isoscalar pairing is still under debate. Many experiments on np transfer have been made along the N=Z line but very few performed and analyzed systematically along a major shell. In this contribution, we analyze (p,3He) and (3He,p) transfer reactions in N=Z sd-shell nuclei. The exclusive cross sections to the lowest 0+ and 1+ states in the odd-odd N=Z nuclei were populated in a series of experiments performed at Grand Raiden high-resolution spectrometer at the RCNP of the Osaka University. These data will be compared to 2nd-order DWBA calculations with proton-neutron amplitudes obtained in the Shell Model formalism by using USDB interaction. The preliminary analysis shows tentative cases where the pn isoscalar pairing is not negligible and need to be taken into account in order to reproduce the present experimental data.

Primary authors

Dr. Ayyad Yassid (Lawrence Berkeley National Laboratory) Mr. Lay Valera José Antonio (Universidad de Sevilla)


Prof. Brown B. A. (National Superconducting Cyclotron Laboratory, USA) Prof. Lee J. (University of Hong Kong) Prof. Macchiavelli A. O. (Lawrence Berkeley National Laboratory)

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