Natalia Cieplicka-Oryńczak

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Presentation transcript:

Natalia Cieplicka-Oryńczak Angular correlations of g rays from 206Tl produced in thermal neutron capture Natalia Cieplicka-Oryńczak Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland Shapes and Symmetries in Nuclei: from Experiment to Theory , 6-10 November 2017, Gif-sur-Yvette, France

Physics motivation Why the 206Tl nucleus? The ideal nucleus for testing the shell-model calculations: couplings between valence proton hole and valence neutron hole Very good system for studying phonon (3– of 208Pb)-valence holes coupling Z=82 N=126 208Pb 206Tl

Experiment – ILL Grenoble (28/01 – 06/02/2017) 205Tl(n,g)206Tl reactions neutron flux 108n/(s  cm2) 1.9-g target of 205Tl (99.9% enriched) 221 hours of measurements Capture state at neutron binding energy 1/2+ (0+,1+) 6.5 MeV 205Tl We expect to populate the states with spins values from 0 to 3 0– 8 HPGe clovers of FIPPS array (32 crystals) – coincidence measurements of gamma rays 206Tl

g-coincidences – first results gate 305 305

g-coincidences – first results gate 4660 4660 266 305 1844 649 1195 1578 1209 1042 1844 649 305 266

g-coincidences – first results gate 5017-305 5017 330 852 1182 1486 852 1182 635 330 305 305

Angular correlations of g rays 1 2  The angular correlation function for a pair of coincident g rays connecting the nuclear states with spins Ji  J  Jf is usually expressed as: W(Θ) = 1 + A2 P2(cos Θ) + A4P4(cos Θ) Θ – the angle between the direction of emission of two g rays Pn(cos Θ) – Legendre polynomials An=qnA(1)A(2) – the coefficients which depend on the attenuation factor qn as well as on the multipolarities of 1 and 2 g rays and the spins of involved nuclear states 8 detectors of FIPPS were arranged into ring around the target at every 45° so the analysis of angular correlations of gamma rays could be performed Angles between the cristals => 20 experimental points

Angular correlations of g rays 0+,1+ 649 5854 E1 ? Multipolarity of the 5854-keV g ray (theoretical values for different spin hipothesis): E1 0+  1–  A2 = 0.5, A4 = 0.0 E1 1+  1–  A2 = -0.25, A4 = 0.0 1 – 649 M1 0 –

Angular correlations of g rays 0+,1+ 5143 0 – (0,1,2)– 1360 1055 1 – 305

Angular correlations of g rays 0 – 1360 M1 711 1 – 649 M1 649 0 –

Angular correlations of g rays 0+,1+ E1 5505 2– (2,3)– 998 (3) – 3 – 801 (M1) M1 535 2 – 266

Angular correlations of g rays (1 –) 1486 (M1+E2) 837 1 – 649 M1 649 0 –

Theoretical calculations ? 132Sn 208Pb 3s 1/2 2d 3/2 1h 11/2 2d 5/2 1g 7/2 3p 1/2 2f 5/2 3p 3/2 1i 13/2 2f 7/2 1h 9/2 p n 206Tl: one proton-hole one neutron-hole nucleus The 206Tl nucleus, having just one proton-hole and one neutron-hole with respect to the best known doubly magic core 208Pb, is an ideal system for testing old and developing new shell model interactions in the south-west quadrant of the nuclear chart with respect to 208Pb. Rydstrom, 206Pb, 206Tl, and 206Hg (Nucl. Phys A512,217(1990)): adjusting some diagonal matrix elements to reproduce more accurately the energies in 206Pb: neutron-hole, neutron-hole (also for 206Tl: proton-hole, neutron-hole, and 206Hg: proton-hole proton-hole). Shell-Model calculations with Kuo-Herling interactions

Theoretical calculations 132Sn 208Pb 3s 1/2 2d 3/2 1h 11/2 2d 5/2 1g 7/2 3p 1/2 2f 5/2 3p 3/2 1i 13/2 2f 7/2 1h 9/2 0 – 2 – 1 – 3 – (2,3) – (1,2) – (0) – (2) – (1,2,3) – (1) – p n 206Tl: one proton-hole one neutron-hole nucleus The 206Tl nucleus, having just one proton-hole and one neutron-hole with respect to the best known doubly magic core 208Pb, is an ideal system for testing old and developing new shell model interactions in the south-west quadrant of the nuclear chart with respect to 208Pb. Rydstrom, 206Pb, 206Tl, and 206Hg (Nucl. Phys A512,217(1990)): adjusting some diagonal matrix elements to reproduce more accurately the energies in 206Pb: neutron-hole, neutron-hole (also for 206Tl: proton-hole, neutron-hole, and 206Hg: proton-hole proton-hole). Shell-Model calculations with Kuo-Herling interactions

Thank you for your attention! Summary The new data from 205Tl(n,g)206Tl experiment at FIPPS will allow to extend the level scheme of 206Tl. Angular correlations of gamma rays will help with spin assignments to the excited states. The level structure of 206Tl investigated in neutron-capture reactions is very good testing ground for the future theoretical calculations around the 208Pb core. Thank you for your attention!