DNP, Hawaii 2014 Non-local potentials in nuclear reactions Luke Titus and Filomena Nunes Michigan State University.

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Presentation transcript:

DNP, Hawaii 2014 Non-local potentials in nuclear reactions Luke Titus and Filomena Nunes Michigan State University

Big science questions How did matter come into being and how does it evolve? Neutron capture on unstable nuclei needed for understanding possible site of r- process: (d,p)/(p,d) reactions offer an indirect tool to extract this information FRIB theory manifesto, Balantekin et al, MPLA 2014 (arXiv: )

Examples of using (d,p) to study unstable nuclei Schmitt et al, PRL 108, (2012), PRC 88, (2013) ADWA 10 Be(d,p) MeV K. Jones et al, Nature 465 (2010) 454, PRC 84, (2011) d( 132 Sn, 133 MeV/u Halo nuclei Neutron rich doubly magic nuclei

Reaction theory: from many body to few body  isolating the important degrees of freedom in a reaction  connecting back to the many-body problem  effective nucleon-nucleus interactions (non-local and energy dependent)

Non-local potential? Phenomenological optical potentials are usually made local U(R) Microscopically derived optical potentials are non-local U(R,R’) Does non-locality make a difference in the reaction? Can we constrain non-locality with reactions?

Non-local Perey and Buck potential in (d,p) Solve the single channel scattering problem with non-local optical potential Solve the single channel bound state problem with non-local mean field Construct the (p,d) amplitude within DWBA Perey and Buck type non-locality Perey correction factor: if the local momentum approximation is valid F. Perey and B. Buck, Nucl. Phys. 32, 353 (1962). N. Austern, Phys. Rev. 137, 752 (1965)

Non-local Perey and Buck potential: effect on (p,d) Titus and Nunes, PRC 89, (2014)

Non-local Perey and Buck potential: effect in (p,d) Titus and Nunes, PRC 89, (2014)

Dispersive Optical Potential (DOM) Mahzoon et al, Phys Rev Lett 112, (2014)

Non-local DOM potential: effect on (p,d) Ross et al., in preparation, SEE REU POSTER PotentialPerey-BuckDOM Energy (MeV) Non-Local relative to local Corrected relative to local Non-Local relative to local 2042 %1 %21 % 3550 %6 %32 % 5028 %2 %20 % 40 Ca(p,d) MeV

Summary and Outlook Impact of non-locality in nuclear reactions DWBA tests show strong sensitivity to non-locality (20-30% change in cross section) need to upgrade best reaction theories to handle non-local interactions use state-of-the-art ab-initio methods with correlations to derive non-local optical potentials

thankyou! Alaina Ross (MSU) supported by NSF, DOE-NT, NNSA Luke Titus (MSU)

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