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JRA-06 INstrumentation for TAGging (INTAG)
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JRA-06 (INTAG)
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
Description of Work Task 1 Improvement of RDT
method Focal plane RDT detectors Prompt
radiation spectrometers for RDT RDT 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
detectors Tracking detectors Task 4
Z,A-identification for medium-mass and heavy
nuclei Gas detectors Silicon
Detectors  
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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 Napiorkowski J Simpson-----
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TASK 1
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
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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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TASK 2
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
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68,70Cu Coulex
68Cu 6- beam
68Cu 1 beam
ISOLDE,Leuven
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RF Cooler HRS project
without cooling with cooling
Laser spectroscopy
HRS upgrade
Cooler HRS
ISOLDE,Manchester
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REX-TRAP project
Operation cycle combines a mass-independent
quadrupolar cooling with a mass-independent
dipolar excitation
40K 40Ca
Mass resolution 5 x 104
ISOLDE
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TASK 3
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
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Diamond detector tests for slow beams
Single crystal CVD detector
GSI,Seville
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Tests of SeD detectors at GANIL
Ions E (MeV/A) dE/dx (MeV/mm) Efficiency Time resolution (FWHM ps)
Heavy Fission frag. Average Z53 0.6 13800 100 250
Light fission frag. Average Z45 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
GANIL,Saclay,Seville
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HPGe Planar Detector Stack for DESPEC Array
Design Simulation
GSI
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TASK 4
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
ASICs 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
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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
(i) Se-D prototype and associated ASICs
electronics.
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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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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Task 1 Improvement of RDT method
(Jyväskylä) Extend the method from a-decay
tagging to ß-? tagging, for the study of NZ
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 a-decay tagging to b 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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