CERN-ISCC Meeting “Storage Ring Facility at HIE-ISOLDE” Klaus Blaum 3rd Nov 2011

Important steps: 1) TSR@ISOLDE Workshop at the Max-Planck-Institute for Nuclear Physics 28.-29.10.2010 (34 participants) 2) Presentation of the TSR@ISOLDE LOI at the CERN INTC- Meeting 02.02.2011 (about 60 coauthors) 3) Presentation of the scientific (Yuri Litvinov) and technical Fredrik Wenander) part of the TSR@ISOLDE Project at the STORI 2011 conference 4) TSR@ISOLDE Meeting at MPIK in order to discuss the open questions related to the preparation of the TDR for the INTC meeting (28.10.2011) 5) TDR for the TSR@ISOLDE project almost ready for submission, which is planned for the February 2012 INTC Meeting (> 120 coauthors, about 20 institutions)

Presently 125 pages!

The heavy ion storage ring TSR at MPIK Heidelberg Circumference: 55m TSR Max Planck Institute Heidelberg Circumference: 55m The heavy ion storage ring is shown on these transparency The beam coming from the post accelerator is injected trough the beam line shown on the right side The same straight section is also used or slow extraction The left straight section is used for electron cooling. The third one for experiment. The last one for diagnostics and for RF system. Multiturn injection is used to fill the storage ring with ions . TSR@HIE-ISOLDE LOI Jan 2011 TDR in progress (K. Blaum, Y. Litvinov)

Some technical details: Typical storage energy for 12C6+: E = 72 MeV  6 MeV/u Vacuum: ~10-11 mbar Acceptance ellipse of the TSR: 120 mm mrad  well suited for REX-ISOLDE Multiturn injection  mA of stored beam possible Electron cooler  transverse cooling time of ~1s RF acceleration and deceleration possible Typical storage times: p @ 21 MeV: 60 h 9Be1+ @ 7 MeV: 16 s 12C6+ @ 73 MeV: 7470 s 35Cl17+ @ 202 MeV: 318 s 197Au51+ @ 710 MeV: 23 s

Physics cases discussed in the TSR@ISOLDE TDR Half-life measurements of 7Be in different atomic charge states Capture reactions for astrophysical p-process Nuclear astrophysics through transfer reactions Nuclear structure through transfer reactions Long-lived isomeric states Atomic effects on nuclear half-lives Di-electronic recombination on exotic nuclei Atomic physics experiments Neutrino physics (Laser spectroscopy experiments in the storage ring)

Two possible locations at ISOLDE for the ring 10m restriction F/CH border F CH Courtesy of Erwin Siesling

Jura (west) side 23.3m 24.6m Building costs: ~ 3MCHF 8

Jura (west) side Proposed layout to fit the TSR at the west side: 23.3m 24.6m 3m Proposed layout to fit the TSR at the west side: - Installation above the CERN infrastructure-tunnel (not negotiable to move the tunnel: houses essential CERN signals and infrastructure) - Tilted beamline coming up from the machine 9

Surface & Weight 10 10 Total surface TSR floor: 24.6x23.3m=573m2 of which 20x20m (400m2) reserved for the ring (final position of the ring within the building to be defined) TSR floor approx . 3m above Hie Linac floor Level of the center of beam at 1.77m above TSR floor 12m Total surface available basement: 12mx24.6m=295m2 to house power-supplies and additional racks (total 29m length floor space for the TSR equipment and 7m for the e-target equipment + 10 standard 19’’ racks and ECOOL HV cage 4x4m2) 10 10

Further information: Detailed estimation of the costs and manpower requirements are in preparation.  preliminary values by MPIK exist; information from CERN needed Funding requests to the different agencies are under discussion (e.g. UK) Ideal time schedule: Building ready end of 2013, move of the ring in 2014, commissioning and start in 2015. Financial support by the ISOLDE Collaboration is needed in order to realize this project.

Some speculations on the EC-decay of 7Be A.V. Gruzinov, J.N. Bahcall, ApJ 490 (1997) 437 S. Kappertz et al., AIP Conf. Proc. Vol. 455 (1998) 110 Ionization of 7Be in the Sun can be ~ 20-30 % Negative magnetic moment of 7Be 7Be + e-  7Li + ne 7Be + p  8B + g 7Be is a key nuclide to calculate the high-energy neutrino flux from the Sun TSR@ISOLDE would be the best place to perform these experiments! Y. Litvinov, MPIK and GSI

Reaction Studies for Astrophysical Applications ESR Gas jet Particle detectors Measurements of (p,) or (α,) rates in the Gamow window of the p-process in inverse kinematics. Advantages: Applicable to radioactive nuclei Detection of ions via in-ring particle detectors (low background, high efficiency) Knowledge of line intensities of product nucleus not necessary Applicable to gases Proof-of-principle experiment: 96Ru (p,g)97Rh Similar experiments possible at TSR@ISOLDE!

Preliminary result @ 11 MeV – upper limit Ignore (p,n) component – resulting in an upper limit for (p,) σPG ~ 4.0 mb Non-smoker: 3.5 mb Similar experiments with radioactive beams feasable at HIE-ISOLDE + TSR. HIE-ISOLDE energy range fits perfectly!

Transfer Reaction Studies: Physics cases Transfer around the island of inversion 32Mg(d,p) T1/2 = 86 ms, 3103 pps  not possible (half lives) Transfer towards 78Ni 68Ni(d,p) T1/2 = 29 s, 5104 pps Limit given by atomic charge exchange Transfer around 100Sn 102Sn(p,d) T1/2 = 4.5 s, 102 – 103 pps ?? Could be feasible! But probably not at 10 MeV/u Transfer around 132Sn 134Sn(d,p) T1/2 = 1 s, 104 pps ? R. Raabe, K.U. Leuven

Transfer Reaction Studies: Physics cases Shape coexistence in n-poor Pb region Still unique @ ISOLDE (Bi, Tl never post-accelerated so far) Beam losses?? 1E2 1E3 1E2 5E3 5E4 2E5 1E6 2E6 1E3 1E4 1E5 1E6 1E2 3E3 1E4 7E4 1E5 2E5 R. Raabe, K.U. Leuven

Nuclear Excitation by Electron Capture an as-yet unobserved process difficulty: NEEC competes with much stronger, but non- resonant process of radiative capture: X-ray emitted, instead of nuclear excitation. electrons nucleons electrons nucleons - nuclear analogue of dielectronic recombination - inverse of electron conversion [A. Palffy et al., Phys. Rev. Lett. 99 (2007) 172502] Proposed candidate 93Mo P. Walker, Surrey

Neutrino physics studies Ideal test facility for the accumulation and storage of 6He