Cu decay into neutron-rich Zn isotopes: shell structure near 78Ni

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Presentation transcript:

Cu decay into neutron-rich Zn isotopes: shell structure near 78Ni Spokepersons: A. Illana Sison (KU Leuven) B. Olaizola Mampaso (UoGuelph)

Motivation Reduction of the proton f5/2 - f7/2 gap when filling ug9/2 protons neutrons g9/2 f7/2 f5/2 Z=28 N=40 p3/2 p1/2  Zn  Ni  Fe  Cr T. Otsuka et al., Phys. Rev. Lett. 95, 232502 (2005) INTC - 29th of June 2016

Physic case for the odd-even Zn What we want to study: No information about B(M1) and B(E2) in the 75,77,79Zn nuclei. Essential constrains for SM calculations. Level scheme for 79Zn was observed in a (d,p) reaction. Isomeric state in 79Zn needs more study. This state hinted to shape coexistence. R. Orlandi et al., Phys. Lett. B 740, 298-302(2015) X.F. Yang et al., Phys. Rev. Lett. 116, 182502(2016) INTC - 29th of June 2016

Physic case for the even-even Zn A lot of information in the level scheme for the most neutron-rich Zn isotopes is still missed M. Niikura et al., Phys. Rev. C 85, 054321(2012) P.R. John. PhD Thesis (2015) INTC - 29th of June 2016

Physic case for the even-even Zn  M. Niikura et al., Phys. Rev. C 85, 054321 (2012)  M. Zielińska., Private communication (2016) New inputs are needed! In 74Zn  Huge discrepancy between RDS and COULEX experiments. It changes the interpretation in the region. No lifetime measurements for 76,78Zn. Independent and reliable inputs are essential for the COULEX calculations. IS557 First HIE-ISOLDE experiment  National Nuclear Data Center (NNDC). DSAM experiments.  J. Van de Walle et al., Phys. Rev. C 79, 014309 (2009) - Coulex experiment  C. Louchart et al., Phys. Rev. C 87, 054302 (2013)  I. Čeliković et al., Act. Phys. Pol. B 44, 375-380 (2013)  S. Hellgartner, PhD Thesis, TU Munich (2015)  Y. Shiga et al., Phys. Rev. C 93, 024320 (2016) ▬ M. Honma et al., Phys. Rev. C 80, 064323 (2009) … S. Lenzi et al., Phys. Rev. C 82, 054301 (2010) ▬ J.-P. Delaroche et al., Phys. Rev. C 81, 014303 (2010) ▬ T. Osuka., Private communication (2016) INTC - 29th of June 2016

The influence of the bn branch 80Cu: Pn  60(20) % Huge impact in the theoretical models. High astrophysical importance. A. Korgul et al., Phys. Rev. C 86, 024307(2012) Z.Y. Xu, PhD Thesis (2014) INTC - 29th of June 2016

The setup Similar setup that this year: 4 HPGe clovers 2 LaBr3 scintillators. (Timing resolution  120 ps) 1 beta plastic scintillator INTC - 29th of June 2016

Fast-timing technique ZXN Z+1XN-1 β- g t ≈ 0 ps TStart TStop ΔT=TStop-TStart Time different between the beta plastic scintillator and the LaBr3 crystal. t > 10 ps Time distribution t  10 – 100 ps t > 70 ps H. Mach et al., Nucl. Instr. and Meth. A 280,49-72 (1989) INTC - 29th of June 2016

What we expect to measure b decay: 74-78Zn: To confirm and extend the level scheme. Looking for possible isomeric states. 79Zn: First decay scheme! Energy and half life of the isomeric state. bn branch: Confirm or increase the precision on Pn values Lifetimes: 74,76,78Zn: Determining the lifetimes for the 4+ and 2+ states. Upper limit for the 6 + state when it will be possible. 75,77,79Zn: Measuring for first time the B(E2) and B(M1) for the most relevant states. Gather more precise information on the isomeric states. INTC - 29th of June 2016

Counting rates and shifts Isotope* T1/2 Yield** [ions/mC] Intensity IDS [pps] Possible Cont. b-gLaBr-gLaBr [Counts/shift] b-gLaBr-gGe Shifts 74Cu 1.594 s 6.0·105 6.0·104 Ga 2.0·102 1.0·103 1 75Cu 1.222 s 1.5·105 1.5·104 5.1·103 76Cu 0.637 s 2.0·104 2.0·103 1.6·102 7.8·102 2 77Cu 468 ms 15 75 3 78Cu 335 ms 20 Ga & Rb 4.6 23 7 79Cu 188 ms 7.1 35 9 80Cu 114 ms  1  0.1 ? 24 shifts Contamination: Never > 1:200 Neutron converter! Calibration shits: 138Cs: 1 shift 88Rb: 1 shift 24Na: 0.1 shift Counts estimated for the g cascade: 74,76,78Zn: 4+  2+ and 2 +  0+ 75Zn: 7/2-  5/2- and 5/2 -  7/2+ 77Zn: 5/2+  3/2+ and 3/2 +  1/2- 79Zn: Only b-g coincidence for the 5/2 +  9/2+ Total: 26 shifts * RILIS for the Ionization ** Yields proton on target extracted from ISOLDE website. For a UCx target. INTC - 29th of June 2016

A. Illana1, B. Olaizola2, L. M. Fraile3, M. Huyse1, P. Van Duppen1, P A. Illana1, B. Olaizola2, L.M. Fraile3, M. Huyse1, P. Van Duppen1, P. Garrett2, A.N. Andreyev4, J. Benito3, T. Berry5, M. Carmona3, H. De Witte1, G. Fernandez-Martinez6, H.O.U. Fynbo7, A. Gottardo8, P.T. Greenlees9, L.J. Harkness-Brennan10, S. Ilieva6, D.S. Judson10, J. Konki9, T.Kröll6, J. Kurcewicz11, I. Lazarus12, R. Lica11;13, M. Lund7, M. Madurga11, N. Marginean13, R. Marginean13, I. Marroquín14, C. Mihai13, D. Mücher2, E. Nacher14, A. Negret13, C.R. Nita13, R. Orlandi15, R.D. Page10, S. Pascu13, A. Perea14, Zs. Podolyak5, V. Pucknell12, E. Rapisarda16, P. Rahkila9, F. Rotaru13, C. Sotty13, O. Tengblad14, V. Vedia3, R. Wadsworth4, J.J. Valiente-Dobon17, N. Warr18 (IDS Collaboration) 1KU Leuven, Instituut voor Kern- en Stralingsfysica, Leuven, Belgium. 2Department of Physics, University of Guelph, Guelph ON, Canada. 3Grupo de Física Nuclear, Facultad de CC. Físicas, Universidad Complutense, Madrid, Spain. 4University of York, Dept. Phys., York, United Kingdom. 5University of Surrey, Surrey, United Kingdom. 6Technische Universität Darmstadt, Darmstadt, Germany. 7Department of Physics and Astronomy, Aarhus University, Aarhus C, Denmark. 8Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Orsay, France. 8University of Jyvaskyla, Department of Physics, University of Jyväskylä, Jyväskylä, Finland. 10Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom. 11ISOLDE, CERN, Switzerland. 12STFC Daresbury, Daresbury, United Kingdom. 13”Horia Hulubei" National Institute of Physics and Nuclear Engineering, Bucharest, Romania . 14Instituto de Estructura de la Materia, CSIC, Madrid, Spain. 15Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Japan. 16Paul Scherrer Institut, Villigen, Switzerland. 17INFN, Laboratori Nazionali di Legnaro, Legnaro, Italy. 18Institut für Kernphysik, Universitätt zu Köln, Köln, Germany INTC - 29th of June 2016

THANKS FOR YOUR ATTENTION

What contamination will we expect? Case A = 78: m/Dm ~ 3236 (73) Neutron converter +HRS will reduce all the Rb contaminant Ga contaminant: A = 75 ~ 1:5 and A = 77 < 1:50. INTC - 29th of June 2016

Our study has a big impact for understanding the r-process. Motivation Our study has a big impact for understanding the r-process. Why? b decay, half-lives and the b-delayed neutron emission around the waiting points are essential inputs for the theoretical model predictions. R.A. Surman et al., capture Gamma-ray spectroscopy and related topics, 41, 304-313(2013) INTC - 29th of June 2016

Centroid shift technique INTC - 29th of June 2016

Convolution technique INTC - 29th of June 2016

Known about: 74Zn INTC - 29th of June 2016 J. Van Roosbroeck et al., Phys. Rev. C 71, 054307 (2005) INTC - 29th of June 2016

Known about: 76,78Zn INTC - 29th of June 2016 J. Van Roosbroeck et al., Phys. Rev. C 71, 054307 (2005) A. Korgul et al., Phys. Rev. C 86, 024307(2012) INTC - 29th of June 2016

74Zn on 208Pb at 4.0 MeV/u 74Zn 2+ → 0+ 74Zn 4+ → 2+ 74Ga Cont. ? INTC - 29th of June 2016

76Zn on 208Pb at 4.0 MeV/u 76Zn 2+ → 0+ 76Ga Cont. 76Zn 4+ → 2+ ? INTC - 29th of June 2016

Known about: 77Zn INTC - 29th of June 2016 S.V. Ilyushkin et al., Phys. Rev. C 80, 054304 (2009) INTC - 29th of June 2016

Known about: 75Zn INTC - 29th of June 2016 S.V. Ilyushkin et al., Phys. Rev. C 83, 014322 (2011) INTC - 29th of June 2016

Known about: 79Zn INTC - 29th of June 2016 R. Orlandi et al., Phys. Lett. B 740, 298-302 (2015) INTC - 29th of June 2016

INTC - 29th of June 2016