HITES, June 2012 Status of reaction theory for studying rare isotopes Filomena Nunes Michigan State University.

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Presentation transcript:

HITES, June 2012 Status of reaction theory for studying rare isotopes Filomena Nunes Michigan State University

what are we after? Effective NN force? Limits of stability? Shell evolution? Deformation? Clusterization? Decay modes? …

Facility for rare isotope beams FRIB

nucleosynthesis in the nuclear chart

what are we after? Reaction probes need reliable reaction theory!

reducing the many body to a few body problem  isolating the important degrees of freedom in a reaction  keeping track of all relevant channels  connecting back to the many-body problem  effective nucleon-nucleus interactions (or nucleus-nucleus) (energy dependence/non-local?)  many body input (often not available)  reliable solution of the few-body problem

ambiguities in optical potentials Schmitt et al, PRL 108, (2012) DWBA entrance channel DWBA exit channel ADWA 10 Be(d,p) MeV

Three classes of theories (Witek’s talk) 3 rd rate – theory forbids 2 nd rate – theory explains after the fact 1 st rate – theory predicts 1 st rate – need to know errors!

differences between three-body methods 3 jacobi coordinate sets Faddeev AGS: all three Jacobi components are included elastic, breakup and rearrangement channels are fully coupled computationally expensive Deltuva and Fonseca, Phys. Rev. C79, (2009). CDCC: only one Jacobi component elastic and breakup fully coupled (no rearrangement) computationally expensive Austern, Kamimura, Rawistcher, Yahiro et al.

elastic scattering: comparing CDCC with Faddeev Upadhyay, Deltuva and Nunes, PRC 85, (2012) d+ 10 Be 71 MeV d+ 12 C d+ 48 Ca 56 MeV 12 MeV21.4 MeV 40.9 MeV

breakup: comparing CDCC with Faddeev Upadhyay, Deltuva and Nunes, PRC 85, (2012)

breakup: comparing CDCC with Faddeev Upadhyay, Deltuva and Nunes, PRC 85, (2012)

differences between three-body methods 3 jacobi coordinate sets Faddeev AGS: all three Jacobi components are included elastic, breakup and rearrangement channels are fully coupled computationally expensive Deltuva and Fonseca, Phys. Rev. C79, (2009). ADWA: only one Jacobi component elastic and breakup fully coupled (no rearrangement) adiabatic approximation for breakup only applicable to obtain transfer cross sections runs on desktop – practical CDCC: only one Jacobi component elastic and breakup fully coupled (no rearrangement) computationally expensive Johnson and Tandy NP (1974) Austern, Kamimura, Rawistcher, Yahiro etc, Prog. Theo. Phys (1986)

transfer (d,p): comparing ADWA, CDCC & Faddeev 10 Be(d,p) 11 Be(g.s.) 71 MeV 12 C(d,p) 12 C(g.s.) 48 Ca(d,p) 48 Ca(g.s.) 56 MeV 12 MeV 21.4 MeV 40.9 MeV PRC 84, (2011), PRC 85, (2012)

transfer: comparing ADWA, CDCC & Faddeev Upadhyay, Deltuva and Nunes, PRC 85, (2012)

error bar on extracted structure from theory [Jenny Lee et al, PRL 2009] [Gade et al, PRL 93, ]

transfer data for Ar isotopes finite range adiabatic methods are used to obtained spectroscopic factors Faddeev calculations are used to determined error in reaction theory [FN, Deltuva, Hong, PRC83, (2011)]

transfer versus knockout [Jenny Lee et al, PRL 2009] [Gade et al, Phys. Rev. Lett. 93, ] [FN, Deltuva, Hong, PRC83, ]

Conclusions CDCC/ADWA versus Faddeev Transfer with ADWA or CDCC (d,p) o good agreement around 10 MeV/u o agreement for ADWA best for l=0 final states o deteriorates with increasing beam energy o ambiguities in optical potentials have larger impact at higher E Breakup with CDCC (d,pn) o good agreement at E>20 MeV/u o poor convergence at lower energies o CDCC does not describe some configurations

thankyou! collaborators: June Hong(MSU), Arnas Deltuva (Lisbon), TORUS collaboration: Charlotte Elster (Ohio), Akram Mukhamedzhanov (Texas A&M), Ian Thompson (LLNL), Jutta Escher (LLNL) and Goran Arbanas (ORNL) Antonio Fonseca (Lisbon), Ron Johnson and Jeff Tostevin (Surrey), This work was supported by DOE-NT, NNSA and NSF our group at MSU: Ngoc Nguyen, Muslema Pervin, Luke Titus, Neelam Upadhyay

thankyou!

reaction methods: CDCC versus Faddeev formalism Faddeev Formalism CDCC Formalism

CDCC model space Upadhyay, Deltuva and Nunes, PRC 85, (2012)

Faddeev calculations: details Upadhyay, Deltuva and Nunes, PRC 85, (2012)

Sensitivity to interactions At low energies, L dependence of NN interaction important At high energies, spin-orbit in optical potential important Upadhyay, Deltuva and Nunes, PRC 85, (2012)