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

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Presentation transcript:

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

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 ?

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

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

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 (%)

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 Fast timing plastic scintillation detectors in 2013

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 … (M.Lewitowicz/R.Gernhauser/SN) 73Sr … 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)

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

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

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

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

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

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

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

Sn Region Spokespersons: G.Simpson /A.Jungclaus/Gadea Analysis is in progress Sn, 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 ions ions Very short T 1/2 ! 136 Sn 138 Sn

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

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

Systematic of beta-decay half-lives for Cd isotopes G.Lorusso RIBF Reference EURICA Preliminary Cd has shorter T 1/ Cd has longer T 1/2 Pinedo & Langanke PRL (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: Discrepancy !!

Mid-shell region (2013 May)

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 Y beta-decay is used as start. Preliminary

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

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

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

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 … (M.Lewitowicz/R.Gernhaueser/SN) 73Sr … 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!

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