DESCRIPTION

Experiment S364

Δ-resonance excitation in isobar charge exchange reactions

The Charge-exchange reactions are very peripheral collisions where only the interaction nucleon-nucleon are possible. In this nuclear reaction the projectile increase its charge for two mechanism: Quasielastic and the inelastic channels. The inelastic channel is the nucleon excitation into the resonance Δ (1232). This experiment aims: isotopic identification, determine the nucleon peripheral distribution in the nuclei and velocity (energy) distributions for the isobaric charge exchange reaction for stable and unstable Sn beams. At the same time, the mass target and energy dependence for the Δ (1232) formation.

The experiments are performed at the SIS synchrotron accelerator at GSI which delivers the ¹²⁴Sn and ¹¹²Sn with an energy of 1 A GeV beams. This beams impinge into different productions targets(C,Cu,Pb,PE) and isobaric Sb and In nuclei are isotopically identify by using the magnetic spectrometer Fragment Separator (FRS).

Unestable beams are posible with secondary targets The ¹¹⁰Sn are ¹²⁰Sn produced impinges on a second reaction target of C for the identification of the fragments on the second part of the spectrometer.

Date: 20-27 June 2011

• Proposal (Download)
• Presentation (Download)

PARTICIPANTS

Participants:

J. Benlliure (1) , A. Kelic (2) ,  D. Pérez (1),  H. Weick (2) ,  J. Vargas (1),  H. Alvarez (1) , Y. Ayyad (1) , T. Aumann (2) ,  J. Atkinson (2) , S. Beceiro (1 ) ,  K. Boretzky  (2 ), M. Caamaño (1 ) ,  E. Casarejos (1),  D. Cortina (1),  P. Díaz (1),  A. Estrade (2), H. Geissel (2) , Y. Litvinov (2) , M Mostazo (1), C. Paradela (1),  S.  Pietri (2) ,  A. Prochazka (2), J.L. Rodriguez-Sanchez (1) , M. Takechi (2) ,  J. Winfield (2) .

(1) University of Santiago de Compostela, Spain

(2) Gesellschaft für Schwerionenforschung, Germany

Date: 20-27 June 2011

PhD student analyzing the data: Jossitt Vargas.

Supervisor: Dr. J. Benlliure

TECHNICAL INFO

1. Filesheet and Elog

2. Experimental Setup

3. FRS ion optics

4. Targets & Degraders

5. Detectors and electronics.

    

   • MW
   • Scintillators
   • MUSIC (PDF file)

    

6. Data acquisition

    

   • MBS
   • DAQ handling
   • On line analysis
   • Parameter list

7. FRS handling

    

   • Before starting (loading ion-optical files, starting different programs ??)
   • Setting the FRS (loading a reference setting and scaling)
   • Saving a setting
   • different programs  SD, DI, setting current grids, change the seetram sensitivity...etc...??)
     How to get the status of all devices in the beam line

8. SEETRAM calibration

ANALYSIS INFO

S364_Analysis

• S364_Analysis (Download)

Location of lmd files:

At Santiago:

- two external hard drives of 1 TB each (currently at Jossitt's desk)

- at fqquique (Jossitt's computer), in  /mnt/scratch/jossitt/S364 and  the root files /mnt/scratch/jossitt/S364/rootfiles

At GSI:

- at  /d/rising03/s364/root_files

Important links:

ELOG logbook-->record of all the settings and modifications of runs .

FRS Logbook --->  full version in .pdf format of the FRS logbook

ELOGFileSheets

S364 webpage

MAIN RESULTS

Knockout and fragmentation reactions using a broad range of tin isotopes

J.L. Rodríguez-Sánchez, J. Benlliure, J. Vargas et al., Phys. Rev. C 96, 034303 (2017)

 Exciting baryon resonances in isobar charge-exchange reactions

J. Benlliure, J.L. Rodríguez-Sánchez, J. Vargas et al., Il Nuovo Cimento C 39, 401 (2016)

 Baryon resonances investigated in isobaric charge-exchange reactions

J. Benlliure, Y. Ayyad, E. Casarejos, D. Cortina-Gil C. Paradela, J.L. Rodríguez-Sánchez, J. Vargas et al., GSI scientific report 2015, p. 100.

 Unfolding the response of a zero degree manetic spectrometer from measurements of the Δ resonance

J. Vargas, J. Benlliure and M. Caamano, Nucl. Instrum. Methods A 707, 16 (2013)