György Gyürky Institute for Nuclear Research (Atomki)

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Nuclear Astrophysics Experiments in ATOMKI Gy. Gyürky Institute of Nuclear Research (ATOMKI) Debrecen, Hungary.

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Presentation transcript:

Charged particle capture and elastic scattering experiments relevant to the astrophysical p-process György Gyürky Institute for Nuclear Research (Atomki) Debrecen, Hungary International Nuclear Physics Conference (INPC 2013), Firenze, Italy, 2-7 June 2013

Heavy element nucleosynthesys n capture - decay + decay s-process

Heavy element nucleosynthesys n capture - decay + decay r-process

Heavy element nucleosynthesis p-isotopes p-process n capture - decay + decay r-process 4

P-process: several sub-processes only groups of p-isotopes rp-process pn-process p-process -process -process proton capture reactions neutrino-induced reactions the whole mass range gamma-induced reactions

Gamma-process network T. Rauscher et al. Rep. Prog. Phys. 76, (2013) 066201 Gamma-process network (,n) 108Sn 109Sn 110Sn 111Sn 112Sn 113Sn 114Sn 115Sn 116Sn (,) (,p) 106Cd 108Cd

(,) reactions /from inverse (,)/ Lack of experimental data Strong sensitivity of the models W. Rapp et al., AJ 653, (2006) 474.

(,) experiments on heavy isotopes at Atomki, Debrecen, Hungary 127I(,)131Cs 121Sb(,)125I 115In(,)119Sb 107Ag(,)111In 191Ir(,)195Au 169Tm(,)173Lu 162Er(,)166Yb 130Ba(,)134Ce Starting Grant

Experiments 20 MeV cyclotron of Atomki, Debrecen, Hungary Activation method

130Ba(,)134Ce Z. Halász et al., Phys. Rev. C 85, 025804 (2012).

169Tm(,)173Lu G.G. Kiss et al., Phys. Lett. B 695, 149 (2011).

127I(,)131Cs G.G. Kiss et al., Phys. Rev. C 86, 035801 (2012).

Gamow windows* at T9 = 2.5 Extrapolations inevitable! 5.8-9 MeV 127I(,)131Cs 6.1-9.3 MeV 130Ba(,)134Ce Extrapolations inevitable! 7.2-10.2 MeV 169Tm(,)173Lu *T. Rauscher, PRC 81, 045807 (2010).

Cross section sensitivity on input parameters 127I(,)131Cs Gamow window Experimental data

Cross section sensitivity: (,n) reactions 127I(,n)131Cs Experimental data

(,n) cross section measurements: activation often possible

(,n) cross section measurements Z. Halász et al., Phys. Rev. C 85, 025804 (2012). 130Ba(,n)133Ce 130Ba(,)134Ce

(,n) sensitivity on optical potential 169Tm(,n)172Lu Experimental data McFadden & Satchler Demetriou et al. Fröhlich & Rauscher Avrigeanu & Avrigeanu Sauerwein et al. T. Rauscher et al., PRC 86, 015804 (2012).

Direct study of optical potential High precision, low energy elastic scattering experiments Suggestion for a new global potential systematic (,) elastic scattering experiments Starting Grant

Comparison with global potentials G.G. Kiss et al., Phys. Rev. C 80 (2009) 045807

Construction of local potentials

Towards a new global potential Based on scattering data Double folding + surface WS Few (5) adjustable parameters Optimized for low energy In progress... Local fit New global pot.

Further progress needed Study of possible astrophysical sites Charged particle induced reactions Experiments off-stability 96Ru(p,)97Rh reaction in inverse kinematics at ESR, GSI

Novel approaches with stable targets X-ray detection based activation Activation with AMS Thick target yield measurements Total cross section determination (from combining scattering and capture) Inelastic scattering measurements ...

Thank you for your attention! ATOMKI nuclear astrophysics group: Zs. Fülöp Gy. Gyürky Z. Halász G.G. Kiss E. Somorjai T. Szücs Z. Korkulu C. Yalcin A. Ornelas P. Mohr (external member from Schwäbisch Hall, Germany) In collaboration with: Kocaeli University, Turkey University of Lisbon, Portugal ... Continuous theoretical support from T. Rauscher (Uni. Basel, Switzerland) http://astro.atomki.hu/ 25

Nuclei in the Cosmos - XIII Debrecen, Hungary, 7-11 July 2014 http://www.nic2014.org/