EURISOL DS Task 11.2 Universidad de Santiago de Compostela, Spain Eurisol DS: task 11 meeting March‘05

Subtask description  Preparation of an experiment to investigate residual nuclei production in the reaction 132 Sn+Be at different energies and data taking of the experiment  Analyze data, provide production cross sections and validate and improve model calculations on fragmentation of neutron-rich projectiles Eurisol DS: task 11 meeting March‘05

Implementation plan for the first twelve months  Preparation of the experiment proposal and submission to the GSI PAC.  Construction of specific detectors required for this experiment new readout for ADCs to increase the acquisition rate Eurisol DS: task 11 meeting March‘05  Detailed planification of the experiment  Beam time preparation: detector setup and DAQ  Data taking with 136 Xe and 238 U beams

Reminder of the experiment  Production of extremely neutron-rich isotopes (two-step schemes: fission + cold fragmentation) n,p U  132 Sn + Be  X  Ground state properties of extremely neutron-rich isotopes Total interaction cross sections: rms matter distributions Proton knock-out: rms charge distributions, binding energies Proton and neutron pickup: charge versus mass distribution Eurisol DS: task 11 meeting March‘05

Experimental details S2-S4: Sn + Be  X S0-S2: 238 U(950 A MeV)+Pb  Sn  Z/Z ~  B  /  ~  ToF ~ 150 ps L ~ 18 m  A/A ~  Z/Z ~  B  /  ~  ToF ~ 150 ps L ~ 36 m  A/A ~ Eurisol DS: task 11 meeting March‘05

Experimental details 238 U(1 A GeV)+d  1XX Sn 5 different settings centered on: 124 Sn, 126 Sn, 128 Sn, 130 Sn, 132 Sn Eurisol DS: task 11 meeting March‘05

Beam time request Projectile1 st FRS section2 nd FRS sectionBeam time 238 U(950 MeV) FRSCalibrations1 day 238 U(950 MeV) 124 Sn 124 Sn (int. + 1p) 123 Sn (pickup) 3 hours 7 hours 238 U(950 MeV) 126 Sn 126 Sn (int. + 1p) 125 Sn (pickup) 3 hours 7 hours 238 U(950 MeV) 128 Sn 128 Sn (int. + 1p) 127 Sn (pickup) 3 hours 7 hours 238 U(950 MeV) 130 Sn 130 Sn (int. + 1p) 129 Sn (pickup) 3 hours 7 hours 238 U(950 MeV) 132 Sn 132 Sn (int. + 1p) 131 Sn (pickup) 134 Sn (2p,3p,4p) 3 hours 7 hours 4 days Total requested time: main beam time ( 238 U)  7 days (21 shifts) parasitic beam ( 136 Xe)  5 days Eurisol DS: task 11 meeting March‘05

Present status of the work Eurisol DS: task 11 meeting March‘05  A new plastic scintillator detector is being built at GSI to be used as ToF start at S1  The experiment proposal was submitted and approved by the GSI PAC (18 shifts 136 Xe-parasitic and 18 shifts 238 U )  There are two options for the tracking at S2 (GEM or TPCs). We should decide on one of those  Somebody should work on the new readout of ADCs  We propose a special meeting to coordinate the preparations (participants outside EURISOL: CENBG, Finland)  We will try to get the beam in the first block of 2006

Resources distribution Eurisol DS: task 11 meeting March‘05 EU contract resources:  2005: 6 man-month (student): 12 K€ + meetings 2 K€  2006: 12 man-month (student): 24 K€ + meetings 2 K€  2007: 12 man-month (student): 24 K€ + meetings 2 K€  2008: 6 man-month (student): 12 K€ + meetings 2 K€ Other resources:  2005: traveling (preparation of beam time): 6 K€  2006: traveling (beam time): 8 K€  : traveling (data evaluation): 6 K€