intag peter butler, jra-06 intag i3 eurons jra-06 instrumentation for tagging (intag)

INTAG

Peter Butler, JRA-06 INTAG

I3 EURONS JRA-06 INstrumentation for TAGging (INTAG)

http://europa.eu.int/comm/research/fp6/index_en.html

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I3 EURONSJRA-06 (INTAG)

Description of Work:Task 1: Improvement of RDT method

Focal plane RDT detectorsPrompt radiation spectrometers for RDTRDT detector exploitation

Task 2: Application of tagging method to ISOL beams Magnetic pre-selection Tests with target detectors Magnetic separator design

Task 3: Application of tagging method to in-flight separated beams Ge detectorsTracking detectors

Task 4: Z,A-identification for medium-mass and heavy nuclei Gas detectors Silicon Detectors

Objectives:The main objective of this Joint Research Activity is the improvement of nuclear tagging techniques. INTAG will be concerned with the development of instrumentation (separators and detectors) that is used to identify the radioactive nuclei with respect to their atomic number Z and mass number A. This is expected to increase the experimental peak-to-background ratio in specific cases by several orders of magnitude


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P Butler------- M Gorska------M Rejmund----R Julin---------E Fioretto-----L Fraile--------P Van Duppen--

C Theisen-----G Dûchene-----

M Hass--------P NapiorkowskiJ Simpson-----


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The GREAT spectrometer with a planar Ge and a large Clover Ge detector was used to identify the decay of K- isomers in superheavy elements.

A proof of principle- experiment of the beta- tagging method, has been applied. A new scintillator detector has been tested

First in-beam tests by using TNT digitisation card have been carried out.

Design work for a new type spectrometer (SAGE) for simultaneous in-beam electron- and gamma-ray detection has been started

U-Jyväskylä, U-Liverpool, CCLRC-Daresbury, CEA-Saclay

Contribution from U-York

TASK 1


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K-Isomer tagging: 250Fm

Jyväskylä,Liverpool


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Recoil-beta tagging: 74Rb

Jyväskylä,York


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SAGE electron/ gamma-ray spectrometer

Jyväskylä,Liverpool


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The new RFQ cooler and buncher has been assembled in an offline laboratory. First injection tests on the RFQ cooler have taken place.

Isomeric beams have been successfully separated using RILIS and post-accelerated at REX-ISOLDE for Coulomb Excitation experiments.

A new version of the Coulomb excitation code GOSIA, GOSIA2, has been developed.

CERN, GANIL, KU-Leuven, U-Liverpool, CCLRC-Daresbury, IN2P3, U-Warsaw, Weizmann, U-Jyväskylä

Contributions from U-Manchester, LPC Caen, U-Edinburgh, TU-Munich and U-York

TASK 2


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68Cu1+ beam

68Cu 6- beam

68,70Cu Coulex

ISOLDE,Leuven

6-

1+


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I3 EURONS RF Cooler & HRS project

Laser spectroscopy

HRS upgrade

Cooler+ HRS

without cooling with cooling

ISOLDE,Manchester


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REX-TRAP project

40K 40Ca

Mass resolution 5 x 104

Operation cycle combines a mass-independent quadrupolar cooling with a mass-independent dipolar excitation

ISOLDE


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Conceptual design prepared for Ge planar stack array, and a test crystal was bought.Tracking algorithm designed and tested on one triple Ge-stack prototype detector

Conceptual design prepared for tracking detectors. Test of diamond tracking detectors was performed. First tests of the existing detectors were performed with fast and slow radioactive beams.

GSI, IN2P3, U-Warsaw, KU-Leuven, IPHC Strasbourg, U-Jyväskylä

Contributions from IFJ Krakow, University of Huelva, University of Seville

TASK 3


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Diamond detector tests for slow beams

GSI,Seville

Single crystalCVD detector


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Magnetic coils

Metal testing Mask

Emissive foil

Secondary Electron Detector

Incoming ions

Ions E(MeV/A)

dE/dx(MeV/mm)

Efficiency Time resolution(FWHM ps)

Heavy Fission frag.Average Z~53

0.6 13800 100% 250

Light fission frag.Average Z~45

1 13200 100% 250

76Ge 2 10500 100% 500

24Mg 12 1050 85% 800

12C 10 320 75% 1000

Alpha 1.5 160 40%(70%*)

1200*

Tests of SeD detectors at GANIL

GANIL,Saclay,Seville


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HPGe Planar Detector Stack for DESPEC Array: Design & Simulation

GSI


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Two Focal Plane Detectors for the PRISMA spectrometer are being tested. A prototype Secondary Electron Detector has been built. The front end electronics system for this is under construction and first tests have been done.

Position sensitive Si strip detectors purchased and design of the recoil tagging detector for the PRISMA spectrometer in Gas-Filled Mode completed. Assembling of the recoil tagging detector and associated electronics in progress.

Development of an highly segmented windowless Si wall with ASIC’s electronics for VAMOS using the Recoil Tagging and Recoil Decay Tagging modes in progress.

INFN-LNL, CCLRC-Daresbury, CEA-Saclay, GANIL

Contributions from U Manchester, U Padova

TASK 4


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(i) Se-D prototype and associated ASICs electronics.

Detectors at the focal plane of the PRISMA developed in order to improve its sensitivity for very heavy-ions at low energies and light-ions

INFN-LNL,Manchester


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(ii) New PPACs developed at LNL.

INFN-LNL


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The MUSETT segmented silicon array at the focal plane

of VAMOS adapted to the detection of very-heavy and

low velocity ions.

GANIL,Saclay


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I3 EURONS MEETINGS

start-up meeting January 27, 2005 Jyväskylä

INFN-UK meeting on task 4 March 19, 2005 LNL

SC meeting June 8-9, 2005 Saclay

MINIBALL working meeting September 26-27, 2005 CERN

REX-ISOLDE working meeting November 21-22, 2005 CERN

SC meeting January 23, 2006

Workshop and SC meeting May 26, 2006 LNL Recoil Separator meeting June 21, 2006 Leuven

SC meeting November 20, 2006

Workshop and SC meeting May 24-25, 2007 GSI


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FINIS


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I3 EURONSTask 1: Improvement of RDT method

(Jyväskylä)

Extend the method from α-decay tagging to β-γ tagging, for the study of N~Z nuclei. Requires high granularity and small signal detection. General testing of the method will be carried out using the focal plane spectrometer (segmented Si – Ge array).

Subtask “Focal plane RDT detectors": Extension of GREAT and other focal plane spectrometers to include segmented planar Ge and large clover Ge (Daresbury, Liverpool); extension of the RDT method from -decay tagging to tagging (Daresbury, Jyväskylä, Liverpool); conceptual design of ASICs (Saclay).

Subtask “Prompt radiation spectrometers for RDT": Digitisation of signals from detectors for prompt radiation (Daresbury, Jyväskylä, Liverpool); development of new prompt radiation spectrometers (Daresbury, Jyväskylä, Liverpool).

Subtask “RDT detector exploitation”: Marry extended GREAT to focal plane of RITU, in-beam testing; provide RITU expertise and accelerated beams (Jyväskylä).


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Task 2: Application of tagging method to ISOL beams (ISOLDE)

Apply the RDT method to ISOL beams. Improve in-beam and radioactive decay studies of short-lived exotic nuclei, selected using (i) laser ionization, (ii) magnetic separation before and/or after secondary reaction, (iii) RDT, for ISOL beams. Requires better magnetic selectivity of the ISOLDE-HRS separator. Close links will also be made with the LASER JRA. A design study will be made for a magnetic spectrometer that will transport particular reaction products following the secondary reaction.

Subtask “Magnetic pre-selection": Design of beam emittance meters and upgrade of ISOLDE HRS also using beam cooling, provide accelerated radioactive ion beams (ISOLDE). Application of ion selection using laser resonance techniques (Leuven).

Subtask "Tests with target detectors": Development of prototype large solid-angle Bragg spectrometer for application to weak radioactive beams (Liverpool, Daresbury, ISOLDE). Test of 12-fold segmented Ge detector in weak radioactive beams (Leuven) and development of tracking algorithms (Strasbourg). Analysis of Coulex (Warsaw).

Subtask "Magnetic separator design": Design of magnetic separator for selection of reaction products after secondary target (GANIL, Weizmann, Leuven, Jyväskylä, Liverpool).


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Task 3: Application of tagging method to in-flight separated beams

(GSI)

Radioactive decay studies and Coulomb excitation of short-lived exotic nuclei, selected by RDT, following fragmentation of relativistic beams, slowing or stopping of beams. Studies to determine the optimum configuration for a RDT set-up for studying multiple Coulomb excitation and transfer reactions following slowing down of fragmentation products. Investigate the role of large energy spread, emittance and beam size, and tracking. Networking between INTAG and the RHIB JRA necessary. Subtask "Tracking detectors": Development of tracking detectors for fragmentation beams; test of prototype transmission detectors; provide radioactive ion beams (GSI, Warsaw, Leuven). Investigate influence of the fragment beam emittance on angular distribution measurements, look for possible corrections using fragment tracking at the FRS (Leuven). Design studies of optimal RDT set-ups (GSI, Warsaw, Leuven). Activities connected close to HISPEC/DESPEC.

Subtask "Ge detectors": Development of segmented Ge planar detectors, of algorithms for pulse shape analysis and event tracking (Strasbourg). Implementation of large energy spread, emittance and beam size vs. analysis of Coulex data using the GOSIA code (Warsaw).


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Task 4: Z,A-identification for medium-mass and heavy nuclei (Legnaro)

Z, A determination for medium-mass and heavier nuclei using PRISMA at INFN, Legnaro and VAMOS at GANIL, Caen. Development of ionisation and tracking detectors effective for slow, heavy ions allowing unique identification of reaction products. Study application of pulse-shape analysis in Si detectors. Development of suitable transmission position-sensitive detector with minimal stopping power.

Subtask "Gas detectors": Development of a secondary-electron gas detector with a thin emissive film to be used in conjunction with PRISMA in order to detect low energy heavy-ions and/or light ions at the focal plane of the magnetic spectrometer; bench tests of the detector in UK and its in-beam commissioning at LNL (Daresbury, Saclay, Legnaro). Further development of large area MCP and MWPPAC; bench tests and in-beam commissioning at LNL (Legnaro). Development of detectors and algorithms of tracking and identification of charged particles in magnetic spectrometers (GANIL).

Subtask “Silicon Detectors": Application of methods to identify low-energy ions using silicon detectors (Saclay), development of low noise ASICs (Saclay, GANIL). Development of a recoil tagging system based on Si strip detectors for the gas-filled mode operation of PRISMA; bench tests of the tagging detector and its in-beam commissioning at LNL (Legnaro).


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intag peter butler, jra-06 intag i3 eurons jra-06 instrumentation for tagging (intag)

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