1 / 30

Latest results from MINIBALL at REX‐ISOLDE Overview physics case Last REX-ISOLDE campaign Perspectives with HIE-ISOL

Latest results from MINIBALL at REX‐ISOLDE Overview physics case Last REX-ISOLDE campaign Perspectives with HIE-ISOLDE Peter Reiter IKP, University of Cologne for the MINIBALL collaboration 3 RD EGAN Workshop 24 th – 27 th June, 2013, University of Liverpool.

stian
Télécharger la présentation

Latest results from MINIBALL at REX‐ISOLDE Overview physics case Last REX-ISOLDE campaign Perspectives with HIE-ISOL

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Latestresults from MINIBALL at REX‐ISOLDE • Overviewphysicscase • Last REX-ISOLDE campaign • Perspectiveswith HIE-ISOLDE • Peter Reiter • IKP, University of Cologne • for the MINIBALL collaboration • 3RD EGAN Workshop 24th – 27th June, 2013, University of Liverpool

  2. Outline - Physicscase- MINIBALL@REX-ISOLDE - Perspectives Shell Model Physics with MINIBALL@REX-ISOLDE “Island of inversion” N=20 Coulomb excitation & transfer reactions (Darmstadt, Cologne, Munich) 26,28,29,30Na 29,30,31,32Mg Phys. Lett. B, 700 ( 2011) 181 Phys. Rev. Lett. 105, 252501 (2010) Phys. Rev. Lett. 103, 012501 (2009) Phys. Rev. Lett. 94, 172501 (2005) Towards the doubly magic 78Ni with Coulomb excitation and nucleon transfer reactions around 68Ni (CERN, Leuven, Munich) 66,67,68Ni 67,68,69,70,71,73Cu 72,74,76,78,79,80Zn Phys. Rev. C 84, 064323 (2011) Phys. Rev. C 82, 064309 (2010) Phys. Rev. C. 79, 014309 (2009) Phys. Rev. Lett. 100, 112502 (2008) Phys. Rev. C. 78, 047301 (2008) Phys. Rev. Lett. 99, 142501 (2007) Phys. Rev. Lett. 98, 122701 (2007) transfer reactions at N=28 (Darmstadt, Munich) 46Ar

  3. Outline - Physicscase- MINIBALL@REX-ISOLDE - Perspectives Shell Model Physics with MINIBALL@REX-ISOLDE Towards the doubly magic 100Sn (Lund, CERN) 106,107,108,109,110Sn 107,108In 100,102,104Cd Phys. Rev. C 87, 017301 (2013) Phys. Rev. C 86, 031302(R) (2012) Eur. Phys. J. A (2012) 48: 105 Eur. Phys. J. A 44 (2010) 355 Phys. Rev. C 80, 054302 (2009) Phys. Rev. Lett. 101, 012502 (2008) Phys. Rev. Lett. 98, 172501 (2007) g-factors in Te isotopes (Darmstadt, Madrid) 132,134,136Te B(E2) measurements around 132Sn (Darmstadt, Munich) 122,123,124,128Cd 138,140,142,144Xe 140,142,148Ba

  4. Outline - Physicscase- MINIBALL@REX-ISOLDE - Perspectives Shapes & collectivity with MINIBALL@REX-ISOLDE Shapes and collectivity in the rare earth region (Darmstadt, Saclay, Oslo) 138,140Nd 140,142Sm 142Gd 144Dy Collectivity near Z=50 (York, Darmstadt) 116,118Te Shapes and collectivity between Kr and Sr (York, Cologne, Munich, Orsay, Liverpool, Grenoble, Saclay) 72Kr 88,92,94,96Kr 93,95,97,99Rb 96Sr Nucl. Phys. A 899 (2013) 1 Phys.Rev.Lett. 108, 062701 (2012) Phys.Rev.Lett. 98, 072501 (2007)

  5. Outline - Physicscase- MINIBALL@REX-ISOLDE - Perspectives Shapes & collectivity with MINIBALL@REX-ISOLDE Shapes and collectivity in light Po, Rn nuclei (York, Jyväskylä) 206Po 202,204Rn Octupole collectivity in heavy Rn, Ra isotopes (Liverpool) 220,222Rn 222,224Ra Nature 497 (2013) 199 Shapes in Hg, Pb, Po nuclei (Leuven, Liverpool, Jyväskylä) 182,184,186,188Hg 188,190,192,194,196,198Pb 196,198,200,202Po

  6. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives • RIB Production: • 1,4 GeVprotons • varioustargets • ionization • massseparation in GPS/HRS • 800 RIBs available • New • Astatine beam production and ionizationspectroscopy • S. Rothe et al., • Nat. Commun. 4:1835 doi: 10.1038/ncomms2819 (2013).

  7. 6- 6- 722  1+ 242 68Cu  1+ 0 101  3-  6- 0  1+ (g.s.) 6- (g.s.) 3- 70Cu 1+ Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Isomericbeams @ ISOLDE • techniquebased on in-sourcelaserspectroscopy • (Fedosseev, V. N. et al. Rev. Sci. Instrum. 83, 02A903 (2012)) • set the laserfrequency to select and maximize the productionof the isomer of interest g-Spectroscopy withCu isomer beams: I. Stefanescuet al. PRL 98, 122701 (2007), E. Rapisarda et al. PRC 84, 064323 (2011) • newcase123Sn beam T. Kroell et al., experiment IS524

  8. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives • Charge breeding: • coolingandbunchingofthe • RIB in theREXTRAP • breedingtohighercharge • states in theEBIS to A/q<4.5 • breeding time upto 400 ms • A/q selection RIB preparation @ REX-ISOLDE • Re-acceleration • accelerationoftheions in the • REX-LINAC • beam energy: 0,8-3,0 MeV/u • AccelerationuptoRa achieved

  9. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives MINIBALL Coulomb excitation setup • segmented Si detectorforparticledetection (DSSSD) • 16 rings (front side) • 96 strips (back side) • angle coverage: θlab = 16-55° • ΔE-E measurementpossible (pad) N. Warr, et al., Eur. Phys. J. A (2013) 49: 40

  10. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives IS524 - Coulex of 123Cd Physics aim: Enhanced quadrupole collectivity observed in 122,124Cd (IS411) S. Ilieva et a., to be published Coupling of odd neutron to even core è reveals which orbitals contribute to collectivity Additional finding from JYFLTRAP: Level scheme needs major revision as 11/2- isomer is not at 316 keV but 144(4) keV A. Kankainen et al., Phys. Rev. C 87, 024307 xxx?? 591 250 409 347 374 (123) (9/2+) 691 (5/2+,7/2+) 591 (9/2-) 440 (5/2+) 463 (5/2+,7/2+) 409 11/2- 316 116 (1/2+) 116 3/2+ 0 H. Huck et al., PRC 40, 1384 (1989) A.-L. Hartig, Th. Kröll, et al, TU Darmstadt

  11. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives IS524 - Coulex of 123Cd • First Coulex of odd Cd isotope • at REX-ISOLDE • Beam intensity: ≈ 9 ·104/s • Beam composition: • - 100% Cd • - RILIS beam • - ratio g.s./isomer varied by RILIS setting • (thanks to B. Marsh) • - ≈ 66% 123mCd and ≈ 33% 123Cd PRELIMINARY Energy [keV] • Observables: • cross section (è B(E2)’s), g -ray angular distributions (è spin/parity), ... • First results: • New transition observed: 463 keV, ... • Branchings and intensities are not consistent with level scheme in literature • Analysis by Anna-Lena Hartig (MSc project) [Th. Kröll, S. Ilieva, S. Bönig, M. Thürauf, M. Scheck]

  12. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives Oblate shape in 72Kr - a rarity that gives a deeper understanding of effective nucleon-nucleon interaction Spokesperson: B.S. Nara Singh, IS478, proposed in 2007 104Pd 2 mg/cm2 CD+PAD 72Kr at 200 MeV Considerable efforts over 5 years – beam development and several attempts ~ 28 % effect ~150 counts in 710 keVline May 2012 http://npg.york.ac.uk/structure_current.html B.S. Nara Singh, U of York for the IS478 collaboration

  13. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives Shape transition and coexistence in neutron-deficient rare earth nuclei: Coulomb excitation of 140Sm A.Görgen et al. Univ. Oslo ground-state deformation Gogny HFB (0+) Qs 4+ • ISOLDE IS495 (July 2012) • beam • 140Sm @ 2.85 A MeV • RILIS • 2105 pps @ Miniball • target • 94Mo, 2 mg/cm2 B(E2) B(E2) 2+ Qs B(E2) Prolate configuration mixing caclculation Oblate J.-P. Delaroche et al. Phys. Rev. C 81, 014303 (2010) 0+ Doppler correction projectile Doppler correction target

  14. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives IS495: Differential cross sections – GOSIA analysis preliminary M.Klintefjord, et al., Univ. Oslo

  15. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives Mixed symmetry states in N=80 isotones Present situation & Predictions QPM, IBM Shell model What is the predictive power? • QPM: single 2+ MSS of 140Nd • SM: fragmented 2+ MSS of 140Nd Identify and quantitatively study MSSs of 140Nd and 142Sm Single 2+ MSS of132Te, 134Xe, 136Ba Fragmented 2+ MSS of138Ce QPM and SM reproduce situation in N=80 C. Bauer, N. Pietralla, et al, TU Darmstadt

  16. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives 140Nd,142Sm – MINIBALL 140Sm 142Sm 140Nd 142Sm 140Nd result C. Bauer, et al., Phys. Rev. C in press

  17. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives Results: new B(E2) valuesN=80 Isotone: 140Nd and 142Sm 50 50 82 82 1h11/2 3s1/2 2d3/2 2d5/2 1g7/2 n p • comparisonwith • quasi-particlephononcalculations (N. Lo Iudiceet al., PRC 77, 044310 (2008)) • large-scale shell model calculations (D. Bianco et al., PRC 85, 034332 (2012))

  18. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives Generalized seniority Shape coexistence Change in nuclear structure in neutron deficient Po isotopes Laser spectroscopy at ISOLDE (π1h9/2)2 N = 116 T.E. Cocolios et al. PRL 106:052503 (2011) Transition expected around 200Po A.M. Oros et al NPA 645:107 (1999) N. Kesteloot, et al., Univ. of Leuven R. Julin et al JPG 27:R109 (2001)

  19. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives Coulomb excitation196,198,200,202Po N. Kesteloot, et al., Univ. of Leuven 196Po 198Po 605 keV 2+0+198Po 463 keV 2+0+196Po 871 keV 2+0+94Mo 556 keV 2+0+104Pd 200Po 202Po 677 keV 2+0+202Po 666 keV 2+0+200Po

  20. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives 224Ra (+120Sn) Coulomb excitation • Heaviest • REX-ISOLDE beam • - B(E3, 0+↦3-) L.P. Gaffney, P. A. Butler, M. Scheck, A. B. Hayes, F. Wenander,et al., Nature 497, 199-204 (2013) doi:10.1038/nature12073

  21. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives Permanent EDM violates both T & P symmetries Atomic EDM moment • ‘For a NR system made up of point, charged particles which interact electro-statically with each other and with an arbitrary external field, the shielding is complete.’ • L.I. Schiff, Phys. Rev. 132 (1963) 2194 • Theoreticians search for loopholes in: • relativistic effects (electron) • finite-size effects of nucleus can break the symmetry (nucleus) • magnetic interactions (electron–nucleus) • non-EM exotica in electron-nucleon interaction Nuclear pear-shapes can enhance the “Schiff moment”by ~ 3 orders of magnitude Search candidates are odd-ARn(TRIUMF) and Ra (ANL, ISOLDE)

  22. Outline - Physicscase- MINIBALL@REX-ISOLDE- Coulomb excitation - Perspectives 221Rn Results so far 221Rn, 6x103ion/s30 hour beam time 120Sn target, 2 mg/cm2 223.5 keV Kα1, Kα2 ↓ 22.5 keV 7/2+, 0 keV Kβ1 ↓ 223.5 ↓ 201.0 ↓ 289.3 ↓ George O’Neill, et al., University of Liverpool

  23. Outline - Physicscase- MINIBALL@REX-ISOLDE- Perspectives SPEDE - SPectrometer for Electron DEtection Si detector in backwards geometry Allows conversion electron spectroscopy – complete picture

  24. Outline - Physicscase- MINIBALL@REX-ISOLDE - Perspectives The MINIBALL T-REX setup T-REX: Si detectorarrayforTransfer experimentsatREX-ISOLDE • large solid angle (58% of 4π) • position sensitive • PID (ΔE-E): p, d, t, α, • … and e- from β-decay (!) Technical details: Barrel: 140 mm ΔE / 16 resistivestrips 1000 mm E / pad Backward CD: 500 mm ΔE / DSSSD 500 mm E / pad RIB V. Bildstein, K. Wimmer, Th. Kröll, R. Gernhäuser et al. (fundedby TU München, KU Leuven, U Edinburgh, CSNSM Orsay, TU Darmstadt)

  25. Outline - Physicscase- MINIBALL@REX-ISOLDE- Transfer reaction - Perspectives d(66Ni,67Ni)p – the 68Ni region (N=40) J. Diriken, P. van Duppen, R. Raabe, et al.; IKS-KU Leuven for the IS469 collaboration

  26. Outline - Physicscase- MINIBALL@REX-ISOLDE- Transfer reaction - Perspectives d(66Ni,67Ni)p – the 68Ni region (N=40) • proton gated g-spectrum • g-transitions up to 5800 keV • p-g-g coincidence analysis • p-gprompt-gdelayedanalysis High resolution of MINIBALL allows to resolve states and to analyse angular distribution J. Diriken, et al.; PRL submitted

  27. Outline - Physicscase- MINIBALL@REX-ISOLDE- Transfer reaction - Perspectives d(66Ni,67Ni)p – the 68Ni region (N=40) -1 np1/2 ng9/2 nd5/2 nd5/2 Partial level scheme,17 levels identified and characterized J. Diriken, et al.; PRL submitted

  28. S. Bottoni, S. Leoni, et al.; INFN -,Uni. Milano for the IS536 collaboration

  29. Outline - Physicscase- MINIBALL@REX-ISOLDE- Island of Inversion - Perspectives HIE-ISOLDE • intensity upgrade • energy upgrade 1.2 MeV/u 3 MeV/u 5.5 MeV/u 2015 8 MeV/u 10 MeV/u 2016

  30. Outline - Physicscase- MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives • Summary • REX-ISOLDE versatile accelerator • MINIBALL physics case covers • nuclei up to Radium • First years: Shell model physics • Recent developments: • - Coulex with isomeric and heavy beams • - transfer reactions & g-ray spectroscopy • Major perspective: HIE-ISOLDE l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l

More Related