Presentation is loading. Please wait.

Presentation is loading. Please wait.

Decay spectroscopy of very neutron-rich nuclei at RIBF Shunji NISHIMURA ( RIKEN Nishina Center ) for the EURICA * collaboration INPC2013 June 03 (*) …

Published byCory Pope Modified over 8 years ago

Similar presentations

Presentation on theme: "Decay spectroscopy of very neutron-rich nuclei at RIBF Shunji NISHIMURA ( RIKEN Nishina Center ) for the EURICA * collaboration INPC2013 June 03 (*) …"— Presentation transcript:

1 Decay spectroscopy of very neutron-rich nuclei at RIBF Shunji NISHIMURA ( RIKEN Nishina Center ) for the EURICA * collaboration INPC2013 June 03 (*) … EUROBALL RIKEN Cluster Array

2 Motivation (Decay Spectroscopy) Nuclear Structure – New magic number ? – Disappearance? – Shell quenching? – Deformation? Systematic Study Measurements by decay exp. - Decay curve : T 1/2 - Excited states : E(2 + ),.. - Isomeric states - Q  - Neutron emission (P n ) - Feedback to Nuclear Theory - Study of Nuclear Astrophysics - Feedback to Nuclear Theory - Study of Nuclear Astrophysics Inputs New closed shell nuclei ? Standard shell nuclei Deformed shell quenched nuclei ?

3 Location of Decay Station 238 U … 345 MeV/u, … Intensity = 5 – 12 pnA ! Decay Exp.

4 Beam Production at RIBF  ΔE-TOF-Bρ method using the focal plane detectors.  The implantation of an identified RI is associated with the following β-decay events that are detected in the same silicon pixel (DSSSD). 238 U 9 Be

5 EURICA Project at RIBF RIKEN RIBF (Japan) Euroball Cluster detectors Support structure Readout electronics used for GSI-RISING Installation completed in 2012 Feb. RI beam E  (keV) Effi. = 8% at 1MeV efficiency (%)

6 New Beta Counting System : WAS3ABi (Wide-range Active Silicon-Strip Stopper Array for Beta and ion detection) 8 layers of DSSSDs (40-strips x 60 strips) RIKEN/IBS/TU München In total, 14,400 pixels (19,200 pixels) Timing information is also used for reconstruction of hit position. Options: - Qbeta calorimeter in 2012. - Fast timing plastic scintillation detectors in 2013

7 Survey of Decay Properties with EURICA (Sn) N=82 ○ Beta-ray Half-lives Q  ○ Gamma-ray E(2+), E(4+),.. Isomeric states ○ Neutron emission ○ New isotopes ○ Beta-ray Half-lives Q  ○ Gamma-ray E(2+), E(4+),.. Isomeric states ○ Neutron emission ○ New isotopes 78Ni 7.5 days (SN)  Talk by Xu 81Cu 5.5 days (M.Niikura) 115Nb ~ 128Pd … 10 days H.Watanabe,G.Lorusso 98In,96Cd,94Ag … 6 days P.Boutachkov 136Sn,138Sn,132Cd … 5 days G.Simpson,A.Jungclaus)  Talk by A.Jungclaus 100Sn … 2013.06 (M.Lewitowicz/R.Gernhauser/SN) 73Sr … 2013.06 GLorusso 140Te … 4.5 days A.Odahara, Lozeva/Moon 158Nd, 154Ce, 150Ba … 5 days E.Ideguchi,G.Simpson 110Zr … 10 days (T.Sumikama) 70Fe.. 5 days (G.Venzoni)

8 Decay Spectroscopy in the vicinity of double magic 78 Ni (Z=28, N=50)

9 Beam production around 78 Ni region 80 Ni 77 Co 83 Cu New isotopes (Candidates) 84 Zn 87 Ga 88 Ge Spokesperson: S.Nishimura Half-lives unknown 78 Ni Additional 81 Cu data (Niikura exp.)  ~ 10 k of 78 Ni produced in total. Implantation rate = 20 ~ 50 pps 75 Fe 79 Ni production is.. A/Q Atomic number 73 Mn

10 78 Ni beta-decay half-life Gated on  -delayed γ Preliminary Hosmer (MSU) PRL (2006) Decay spectra obtained in WAS3ABi and with EURICA. What about N=51 ( 79 Ni)? Z=27 ( 77 Co)? 78 Ni ? 79 Ni Preliminary

11 Beta-decay half-lives around 78 Ni FRDM+QRPA KTUY+GT2 77 Co 78 Ni 79 Ni Z=28 N=50 FRDM+QRPA KTUY+GT2 Shorter half-lives beyond 78 Ni ( N=50 and Z=28) RIBF Preliminary

12 Systematic study of T 1/2 around 78 Ni  To be reported by Z.Xu in this session !

13 Decay properties around double magic 132 Sn ( Z=50, N=82 )

14 133Cd J. Hakala et al., Phys. Rev. Lett. 109 (2012) 032501 masses T 1/2 Decay properties around 132 Sn region

15 136-138 Sn Region Spokespersons: G.Simpson /A.Jungclaus/Gadea Analysis is in progress. - 136Sn, 138Sn isomers - A milisecond  -decaying high-spin trap in 129 Cd  Talk by A.Jungclaus tomorrow ! 136 Sn 129 Cd 138 Sn Unknown T 1/2 G. Simpson, G.Gey, A.J.,. submitted to Phys. Rev. Lett. 136 Sn 138 Sn 875.000 ions 5.000 ions Very short T 1/2 ! 136 Sn 138 Sn

16 Decay Spectroscopy around 128 Pd and 115 Nb New IsotopesSpokespersons: H.Watanabe/G.Lorusso New isomers in 126 Pd, 128 Pd!

17 Most Neutron-Rich N=82 Isomer with EURICA (r-Process waiting point) H. Watanabe, G. Lorusso et al., to be published delayed  -ray spectrum EURICA Preliminary A.Jungclaus, PRL99, (2007) No evidence for shell quenching T 1/2 of Cd isotopes

18 Systematic of beta-decay half-lives for Cd isotopes G.Lorusso RIBF Reference EURICA Preliminary - 127-130 Cd has shorter T 1/2 - 131 Cd has longer T 1/2 Pinedo & Langanke PRL 83 4502 (1999) Cd isotopes Significant impact to r-process calculation. New data will give new feedback to SM calc. 130 Cd 129 Ag 128 Pd 127 Rh ? QuestionSM adjustment with previous T 1/2 … Z.Niu, et al. arXiv: 1210.0680 Discrepancy !!

19 Mid-shell region (2013 May)

20 Complementary LaBr 3 array for fast timing with EURICA ● For short life-times a LaBr 3 array for fast timing has been installed to complement the HPGe detectors The LaBr 3 detectors are a part of the FATIMA project at FAIR (Surrey and Brighton) 106,108 Zr  T.Sumikama, F.Browne, A.Bruce 104 Zr Decay spectrum of 140keV γ-ray 18 detectors φ1.5” x 2” Beta-decay of 104 Y  104 Zr 2+2+ 104 Y beta-decay is used as start. Preliminary

21 Shape evolution in neutron-rich A~140 nuclei beyond doubly-magic 132 Sn A. Odahara (Osaka), R. Lozeva (Strasbourg), C.B. Moon (Hoseo) A/QA/Q Te Xe proton number neutron number doubly-magic nucleus 132 Sn (Z=50, N=82) 54 Xe 52 Te

22 Search for K-isomers (Z ~ 60) β4β4 β2β2 P. Möller et al., At. Data Nuc. Data Tab. 59, 185 (1995) 156 Nd

23 EURICA U-beam Campaigns 2012 Nov.-Dec.2013 May Collaboration: Tohoku, Univ. Tokyo, Brighton Univ. Debrecen, Joseph Fourier, Osaka Univ. Peking, LPSC, IBS, Oslo, Consejo Sup. De Inv. Cientificas, IPN Orsay, Padova, Leuven, SKKU, INFN, ANU, Koeln, TU Muenchen, Fisica, Legnaro, ATOMKI, INFN-Milano, INFN-Firenze, INFN-LNL, Univ. di Padova, Surrey, GSI, ANL, Yale, Milano, Univ. Madrid, Tech. Univ. Darmstadt, Univ. Istanbul, CNS, CEA, RCNP, Univ. Notre Dame, Inst. voor Kern-en Stralings Fysica, Hoseo Univ., Univ. Tsukuba, Inst. Plurid. Hubert Curien, and RIKEN

24 RIBF Accelerator - High intensity radioactive beam - U-beam … ~10 pnA, Xe-beam … > 20 pnA BigRIPS/ZeroDegree Beam-line - Large acceptance beam line - Cocktail beam & Particle identification Decay Station - High efficiency gamma-ray detectors (Euroball Ge detectors) - High efficiency beta-ray detectors (DSSSD: WAS3ABi) Collaboration and Future - Proposals, manpower, detectors A lots of new results are coming from RIBF. ○ Beta-ray Half-lives Q  ○ Gamma-ray E(2+), E(4+),.. Isomeric states ○ Neutron emission ○ New isotopes ○ Beta-ray Half-lives Q  ○ Gamma-ray E(2+), E(4+),.. Isomeric states ○ Neutron emission ○ New isotopes 78Ni 7.5 days (SN)  Talk by Xu 81Cu 5.5 days (M.Niikura) 115Nb ~ 128Pd … 10 days H.Watanabe,G.Lorusso 98In,96Cd,94Ag … 6 days P.Boutachkov 136Sn,138Sn,132Cd … 5 days G.Simpson,A.Jungclaus)  Talk by A.Jungclaus 100Sn … 2013.06 (M.Lewitowicz/R.Gernhaueser/SN) 73Sr … 2013.06 GLorusso 140Te … 4.5 days A.Odahara, Lozeva/Moon 158Nd, 154Ce, 150Ba … 5 days E.Ideguchi,G.Simpson 110Zr … 10 days (T.Sumikama) 70Fe.. 5 days (G.Venzoni) SUMMARY A lots of interesting results are coming from EUIRCA at RIBF!

25 Thank you. We acknowledge the EUROBALL Owners Committee for the Loan of germanium detectors and the PreSpec Collaboration for The readout electronics of the cluster detectors. (*Equipments should be back to GSI by 2014 December. ) Part of the WAS3ABi was supported by the Rare Isotope Science Project which is funded by the MEST and NRF of Korea. Acknowledgement GSI supports: I.Kojouharov, H.Schaffner, N.Kurz

Download ppt "Decay spectroscopy of very neutron-rich nuclei at RIBF Shunji NISHIMURA ( RIKEN Nishina Center ) for the EURICA * collaboration INPC2013 June 03 (*) …"

Similar presentations

Search for key nuclear structure states below 132 Sn M. Górska, M. Pfützner, H. Grawe et al.

Search for key nuclear structure states below 132 Sn M. Górska, M. Pfützner, H. Grawe et al.
Daisuke Kameda BigRIPS team, RIKEN Nishina Center

Daisuke Kameda BigRIPS team, RIKEN Nishina Center
Emergence of Exotic Phenomena in Unstable Nuclei –how to observe them-

Emergence of Exotic Phenomena in Unstable Nuclei –how to observe them-
Exploring the drip lines: where are the proton and neutron drip lines exotic decay modes: - two-proton radioactivity -  -delayed multi-particle emission.

Exploring the drip lines: where are the proton and neutron drip lines exotic decay modes: - two-proton radioactivity -  -delayed multi-particle emission.
1. Isospin Symmetry and Coulomb Effects Towards the Proton Drip-Line RISING Experiment performed October 2003 Keele, GSI, Brighton, Lund, Daresbury, Surrey,

1. Isospin Symmetry and Coulomb Effects Towards the Proton Drip-Line RISING Experiment performed October 2003 Keele, GSI, Brighton, Lund, Daresbury, Surrey,
From Magic 208 Pb to the 170 Dy Mid-Shell Paddy Regan WNSL, Yale University, New Haven, CT and Dept. of Physics, University of Surrey, UK

From Magic 208 Pb to the 170 Dy Mid-Shell Paddy Regan WNSL, Yale University, New Haven, CT and Dept. of Physics, University of Surrey, UK
ROGER CABALLERO FOLCH, Barcelona, 9 th November 2011.

ROGER CABALLERO FOLCH, Barcelona, 9 th November 2011.
Beta decay and Structure of Exotic Nuclei near 78 Ni Alexander Lisetskiy NSCL,JINA,MSU.

Beta decay and Structure of Exotic Nuclei near 78 Ni Alexander Lisetskiy NSCL,JINA,MSU.
First spectroscopy of 64 Cr and the collectivity of neutron-rich nuclei at N~40 CEA Saclay: A. Obertelli, F. Flavigny, A. Gillibert, A. Goergen, W. Korten,

First spectroscopy of 64 Cr and the collectivity of neutron-rich nuclei at N~40 CEA Saclay: A. Obertelli, F. Flavigny, A. Gillibert, A. Goergen, W. Korten,
GT (  ) : Weak Process: Important roles in the Universe Combined Analysis of Mirror GT Transitions for the study of Proton-Rich Far-Stability Nuclei.

GT (  ) : Weak Process: Important roles in the Universe Combined Analysis of Mirror GT Transitions for the study of Proton-Rich Far-Stability Nuclei.
DESPEC Report: NuSTAR Management Meeting 12 th July 2010 DeSPEC Project formally started April 2010. Full array of (~)36 LaBr 3 detectors and mechanical.

DESPEC Report: NuSTAR Management Meeting 12 th July 2010 DeSPEC Project formally started April Full array of (~)36 LaBr 3 detectors and mechanical.
Experimental Nuclear Physics in ATOMKI Debrecen. Cyclotron laboratory in ATOMKI, Debrecen.

Experimental Nuclear Physics in ATOMKI Debrecen. Cyclotron laboratory in ATOMKI, Debrecen.
Relativistic Coulomb excitation of nuclei near 100 Sn C.Fahlander, J. Eckman, M. Mineva, D. Rudolph, Dept. Phys., Lund University, Sweden M.G., A.Banu,

Relativistic Coulomb excitation of nuclei near 100 Sn C.Fahlander, J. Eckman, M. Mineva, D. Rudolph, Dept. Phys., Lund University, Sweden M.G., A.Banu,
Rare ISotope INvestigation at GSI Status of the relativistic beam campaign Introduction Fast beam physics program Experimental methods Status and perspectives.

Rare ISotope INvestigation at GSI Status of the relativistic beam campaign Introduction Fast beam physics program Experimental methods Status and perspectives.
Proton and Two-Proton Decay of a High-Spin Isomer in 94 Ag Ernst ROECKL GSI Darmstadt and Warsaw University.

Proton and Two-Proton Decay of a High-Spin Isomer in 94 Ag Ernst ROECKL GSI Darmstadt and Warsaw University.
N. Saito The RISING stopped beam physics meeting Technical status of RISING at GSI N. Saito - GSI for the RISING collaboration Introduction Detector performance.

N. Saito The RISING stopped beam physics meeting Technical status of RISING at GSI N. Saito - GSI for the RISING collaboration Introduction Detector performance.
In-beam γ-ray spectroscopy of very neutron-rich N = 32 and 34 nuclei D. Steppenbeck, 1 S. Takeuchi, 2 N. Aoi, 3 H. Baba, 2 N. Fukuda, 2 S. Go, 1 P. Doornenbal,

In-beam γ-ray spectroscopy of very neutron-rich N = 32 and 34 nuclei D. Steppenbeck, 1 S. Takeuchi, 2 N. Aoi, 3 H. Baba, 2 N. Fukuda, 2 S. Go, 1 P. Doornenbal,
Futoshi Minato JAEA Nuclear Data Center, Tokai Theoretical calculations of beta-delayed neutrons and sensitivity analyses 1.

Futoshi Minato JAEA Nuclear Data Center, Tokai Theoretical calculations of beta-delayed neutrons and sensitivity analyses 1.
Recent Results in Fragmentation Isomer Spectroscopy with RISING Paddy Regan Dept. of Physics University of Surrey Guildford, GU2 7XH, UK

Recent Results in Fragmentation Isomer Spectroscopy with RISING Paddy Regan Dept. of Physics University of Surrey Guildford, GU2 7XH, UK
Decay Spectroscopy Working Group Nuclear Structure Theory Morten Hjorth-Jensen – Shell Structure and Interactions Ivan Borzov – Theory of  Decay Applications.

Decay Spectroscopy Working Group Nuclear Structure Theory Morten Hjorth-Jensen – Shell Structure and Interactions Ivan Borzov – Theory of  Decay Applications.

Similar presentations

Ads by Google