Laboratori Nazionali del Sud Start EXCYT status and perspectives L. CELONA on behalf the EXCYT collaboration Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud Via S. Sofia Catania – ITALY INFN-LNS, October 30th 2010

Laboratori Nazionali del Sud Facility Layout Maximun Energy: 2.5 ÷ 150 MeV (preacceleration energy up to 300 keV) Low emittance (<0.5  mm.mrad): clear-cut beam spot e low angular spread Easy variable beam energy (excitation function study) Low energy spread:  E/E =

Laboratori Nazionali del Sud The mass separator system consists on 2 stages, the first stage on two platforms at High Voltage (up to 250 kV). The design transmision efficiency is ~ 100% with a beam of  x =  y = 4π mm mrad (x 0 =y 0 =  0.2 mm, a 0 =b 0 =  0.2 mm). The mass resolution of each step is: (Pre-separator : 18° magnet and a set of 4 electrostatic quadrupoles) (  ) Pre  180 (Pre-separator : 18° magnet and a set of 4 electrostatic quadrupoles) (I stage: 2 magnets (77° e 90°) and 2 sets of 4 electrostatic quadrupoles) (  ) 1st  2000 (I stage: 2 magnets (77° e 90°) and 2 sets of 4 electrostatic quadrupoles) (II stage: 2 magnets (90°,  =2.6 m) and a set of 4 electrostatic quadrupoles) (  ) 2nd  (II stage: 2 magnets (90°,  =2.6 m) and a set of 4 electrostatic quadrupoles) Isobaric mass separator

Laboratori Nazionali del Sud Pre-separator

Laboratori Nazionali del Sud First and Second stage of the isobaric mass separator LEBI Second stage exit On the HV Platform LEBI To second stage separator CEC

Laboratori Nazionali del Sud Beam lines to the Tandem TANDEM Experimental rooms

Laboratori Nazionali del Sud LEBI: Low Energy Beam Imager / Identifier The device can be placed at three different positions, depending on the application. Stable (pilot) beams hit directly the CsI(Tl) scintillating plate to produce the 2D transversal profile. RIBs are implanted onto a thin mylar tape placed in front of the plate to avoid its contamination. The emitted radiation (mainly  and  rays) crosses the plate producing the light spot. CsI (Tl) plate, 1 – 2 mm PMT Hamamatsu R1924A Plastic scintillator (BC 408, 6 x 6 x 5 cm 3 ) up down Diagnostics for Low Energy RIBs RIBs can be implanted also in front of a large plastic scintillator, used for counting and spectroscopy of beta particles emitted from the radionuclides.

Laboratori Nazionali del Sud 8 Li + decay with LEBI

Laboratori Nazionali del Sud Ion beams produced 13 C  12 C 98WPIS 8 Li 5  10 4 pps (5.4  KeV) 13 C  12 C 82WPIS 9 Li (6  KeV) 13 C  12 C 82WPIS 21 Na (6  KeV) With a primary beam power of 200 watt and some mechanical improvements on target and in the beam transmission through the Tandem a yield of pps might be expected on target. Bad matching Through 47% % On target 8 Li 3+ Primary beam power 13 C 45 AMeV 100watt CEC (10 keV) 8 Li - 2.8% Through platforms 8 Li - Through 2 nd stage Tandem entrance % % % LEBI1 (pps) 8 Li + Good NOT OPTIMIZED

Laboratori Nazionali del Sud BIGBANG Measurement of the 8 Li( ,n) 11 B cross section at E cm = MeV Key reaction in the inhomogeneous Big-Bang model M. La Cognata et al. Physics Letters B 664 (2008) M. La Cognata et al. Astrophysical Journal, 706 (2009) L251 RCS Measurement of the 8 Li + 28 Si total reaction cross section at near barrier energies to determine the size of the unstable Li isotopes Data analysis in progress RSM Measurement of the  - 8 Li elastic scattering excitation functions in reverse kinematics to search for cluster states in 12 B Data analysis in progress CHIMERA-EXCYT Study of 10 Li resonances through the 9 Li(d,p) 10 Li reaction Beam line equipped with diagnostics 06/ Li10.8 W  1.8E6 pps Weak intensity of primary beam (max 20 W), problem of transport over HV platforms and through the tandem. MAGNEX-RIB Exploratory attempt to investigate 8 He states using the ( 8 Li, 8 Be) charge exchange reaction Not yet performed pps required Experiments

Laboratori Nazionali del Sud Work in progress… 1)Improvement of primary beam stability: maximum operations foreseen 200 W. 2)Beam transmission improvements through the Tandem. 3)Further test to optimize transport efficiences in preseparator and tandem coupling line. 4)Maintenance on remote handling systems, water and air treatments, other technological infrastructures.

Laboratori Nazionali del Sud R&D Activities on TIS 1)Better undestanding of diffusion-effusion models and new target design to improve the mechanical stability and to ensure long term operations. 2)Development of HPIS and of the new PIS with Rhenium body to have access to other chemical species ( 15 O and Be included). 3)New target materials (e.g. Foams, Fibers, Ta foils) 4)Careful study of the primary beam in combination with the target material to improve the yields of the desired species. The collaboration with SPES Target Group will play an important role in the achievement of the goals.

Laboratori Nazionali del Sud PIS (Re and W body) and FEBIAD FEBIAD PIS (Re body) R&D Activities on TIS

Laboratori Nazionali del Sud Possible Future beams 8 Li PIS2  10 5 pps (2  KeV) 9 Li PIS1  10 4 pps (1  KeV) 21 Na PIS3  10 4 pps (3  KeV) 11 Be HPIS1  10 2 pps (1  KeV) 27 Si HPIS1  10 3 pps (1  KeV) 25 Al HPIS1  10 3 pps (1  KeV) 11 C HPIS1  10 3 pps (1  KeV) 15 O HPIS2  10 6 pps (2  KeV)

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Laboratori Nazionali del Sud Li + Li - Cs vapour Charge-exchange cell Cs keV 7Li- keV 8Li- keV 7Li- keV 8Li- Eff=5.5%