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Investigation of Neutron-Rich Isotope Production via 132Sn+Be Reactions at Varying Energies

This document outlines the preparation and execution plan for an experiment focused on studying residual nuclei production in the reaction 132Sn + Be at different energies. The objectives are to analyze data, determine production cross-sections, and refine model calculations related to neutron-rich projectiles. Key activities include the proposal submission to the GSI PAC, construction of specialized detectors, and detailed beam time preparations, involving data collection with 136Xe and 238U beams. The current status includes approved proposals and ongoing detector development.

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Investigation of Neutron-Rich Isotope Production via 132Sn+Be Reactions at Varying Energies

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

  2. Subtask description • Preparation of an experiment to investigate residual nuclei production in the reaction 132Sn+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

  3. 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 • Detailed planification of the experiment • Beam time preparation: detector setup and DAQ • Data taking with 136Xe and 238U beams Eurisol DS: task 11 meeting March‘05

  4. Reminder of the experiment • Production of extremely neutron-rich isotopes (two-step schemes: fission + cold fragmentation) n,p + 238U  132Sn + 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

  5. Experimental details S0-S2:238U(950 A MeV)+Pb  124-132Sn DZ/Z ~ 5 10-3 DBr/r ~ 3 10-4 DToF ~ 150 ps L ~ 18 m DA/A ~ 4.5 10-3 S2-S4:124-132Sn + Be  X DZ/Z ~ 7 10-3 DBr/r ~ 3 10-4 DToF ~ 150 ps L ~ 36 m DA/A ~ 2.4 10-3 Eurisol DS: task 11 meeting March‘05

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

  7. Beam time request Total requested time: main beam time (238U)  7 days (21 shifts) parasitic beam (136Xe)  5 days Eurisol DS: task 11 meeting March‘05

  8. Present status of the work • The experiment proposal was submitted and approved by the GSI PAC (18 shifts 136Xe-parasitic and 18 shifts 238U ) • A new plastic scintillator detector is being built at GSI to be used as ToF start at S1 • 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 Eurisol DS: task 11 meeting March‘05

  9. Resources distribution 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€ • 2007-2008: traveling (data evaluation): 6 K€ Eurisol DS: task 11 meeting March‘05

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