1 / 15

Perspectives for Nuclear Spectroscopy at the UNILAC

Perspectives for Nuclear Spectroscopy at the UNILAC. J. Gerl, M. Gorska GSI Darmstadt, Germany UNILAC Workshop GSI 22.8.2016. Focus of GS: Spectroscopy employing RIBs at SIS/FRS. VEGA - RISING – PRESPEC – HISPEC/DESPEC. Nuclear Shell structure N ≈ Z N>>Z Nuclear shapes

helgeson
Download Presentation

Perspectives for Nuclear Spectroscopy at the UNILAC

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. Perspectives forNuclear Spectroscopy at the UNILAC J. Gerl, M. Gorska GSI Darmstadt, Germany UNILAC Workshop GSI 22.8.2016

  2. 15 Focus of GS: Spectroscopy employing RIBs at SIS/FRS VEGA - RISING – PRESPEC – HISPEC/DESPEC • Nuclear Shell structure • N ≈ Z • N>>Z • Nuclear shapes • Quadrupole, Octupole, Triaxiality • Shape transitions • High K-isomers • Collective modes • N>>Z : GDR soft mode • Nuclear Symmetries • mirror-isospin, pn-pair correlation Nuclear astrophysics • r, rp process Relativistic Coulomb excitation, Fragmentation and Decay studies using Rare Isotope Beams and high-resolution  Spectroscopy

  3. 15 Complementary Experiments at UNILAC • Nuclear Shell structure • N ≈ Z • N>>Z • Nuclear shapes • Quadrupole, Octupole, Triaxiality • Shape transitions • High K-isomers • Collective modes • N>>Z : GDR soft mode • Nuclear Symmetries • mirror-isospin, pn-pair correlation Nuclear astrophysics • r, rp process Multiple Coulomb excitation, Transfer, Deep inelastic reactions, Fusion evaporation, Fission and Decay studies using Stable Isotope Beams and high-resolution  Spectroscopy

  4. 15 100Sn as example for multitude of techniques • Fusion symmetric reaction EXOGAM, EUROBALL, GASP.. + Ancillaries - in-beam MSEPat GSI - β decay - spin-gap isomers Argonne/OakRidge - α-decay • Fragmentation GSI, RIBF, NSCL, GANIL - Coulex -Transfer - Isomers - β decay

  5. 15 Spin gap and seniority isomers below N = Z = 50 with RISING and GSI - ISOL • proton – neutron hole-hole interaction in pn g9/2-n • core excitation in large-scale SM in pn g9/2-1 (d5/2 ,g7/2)1 Fusion evaporation reactions best to avoid missing isomers!

  6. 15 NUSTAR instrumentationforspectroscopy HISPEC -LYCCA heavy ioncalorimeterwithToFcapabilityin operation -AGATA gammaspectrometerin operation -Hyde light particlearrayprototype -NEDA Neutron detectorarrayprototype -EDAQ dedicatedelectronicsand DAQ based on severalbranches DESPEC -AIDA activeimplantationdeviceprototype -MONSTER neutronToFarrayunderconstruction -BELEN neutrondetecionarrayin operation -DTASDecay Total Absorption Spectrometerin operation -DEGAS Ge Array gammaspectrometerin development -FATIMA Fast timingarrayin operation -EDAQ dedicatedelectronicsand DAQ based on severalbranches

  7. 15 DEGAS DetectorRealization TDR approved in 7.2015 Design work finished scrutinizedby IFIN-HH Ge Array with 28 Triples Holding bars Connectors Top Deck (Support electronics, power supply and µPC) Middle deck (Ge-PA + HV) Bottom Deck (BC electronics, later Ge-DAQ) Backcatcher Crystal capsule HPGe Crystal Pre-series construction started Funding: Phase I 100% secured Phase II 80% secured

  8. 15 Example: Isomerism in 94Pd • Reaction: 40Ca (~170 MeV) + 58Ni (>2 mg/cm2) -> 2p2n + 94Pd • DEGAS+NEDA+FATIMA • Time differencebetween two coincident γ rays detected in FATIMAγ ray(s) in DEGASand a 2n gate in NEDA Total cross section ~1b Interesting exit channel ~1μb Particle selection

  9. 15 Typical fusion evaporation cross section distributions Narrow resonances eg. 104Sn: Ebeam = 3.6-4.4 MeV/u 50Cr + 58Ni -> 108Te* Tunable beam energy required

  10. 15 At the catcher: εp~55% εα~10% εn~25% εγ~3.5% Prompt and delayed spectroscopy in 98Cd 58Ni + 46Ti → 104Sn* → 98Cd + α2n 8+ 2428 6+ 2281 2083 4+ 1395 2+ 0+ 0 M.Górska et al., Phys. Rev. Lett. 79 (1997) 2415 R. Grzywacz et al., ENAM 98 AIP CP 455 (1998) 430 Similar set-up needed at X7

  11. 15 Example: Lifetime of heavy nuclei • Evolution ofcollectivity in heavy nuclei •  transferreaction • e.g. 12C(204Pb, 208Po)8Be • Ebeam = 5.9 MeV/u M. Reese, GSI

  12. 15 Spin-oriented isomers probing nuclear moments Pulsed beam – nuclear reaction on target – TDPAD (Time Dependent Perturbed Angular Distribution) of  rays H. Watanabe, RIKEN

  13. 15 Example: g-factors from isomer decays H. Watanabe, RIKEN

  14. 15 Requirements for Gamma spectroscopy at UNILAC • Prompt measurements: • broad range of beam isotopes • exactly tunable beam energy (3-7 MeV/u) • long pulses (DC beam) • high duty cycle • moderate intensities • broad range of targets • Fusion evaporation, Deep inelastic, Transfer, multiple Coulex • Delayed measurements: • broad range of beam isotopes • exactly tunable beam energy (3-7 MeV/u) • short pulses possible • moderate to high duty cycle • moderate to high intensities • broad range of targets • Fusion evaporation, Deep inelastic, Fission

  15. 15 Gamma Spectroscopy Programme at UNILAC • Complementary to HISPEC/DESPEC runs at GSI/FRS and FAIR/Super-FRS • Requested beam time: 4-8 weeks/a • Location: X7 cave (SHIP, TASCA in collab. with SHE groups) • Instrumentation: Detectors from HISPEC/DESPEC (in the 11 months/a without RIB availability) • Attractive for the NUSTAR physics community Substabtial addition to scientific output of nuclear spectroscopy at GSI

More Related