S364 Experiment: Resonance in Isobaric Charge-Exchange reactions

Transcription

1 S364 Experiment: Resonance in Isobaric Charge-Exchange reactions Jossitt W. Vargas Cruz GENP,Universidad Santiago de Compostela, Santiago de Compostela, Spain May 19, 2011

2 Motivation The Analysis that the isobar charge-exchange reactions provide a useful tool to study the matter distribution at the periphery of the nucleus. This kind of reactions are sensitive to the neutron and proton distributions in a nucleus.

3 Charge Exchange reactions The Isobaric are posible in a very peripheral collisions where only one interaction nucleon-nucleon are posible. In this case for the 124 Sn projectile with 124 Sb and 124 In yields 1 n p 2 p n

4 In this nuclear reaction the projectile change its charge in one unit. Charge exchange reaction are posible in two channels:

5 In this nuclear reaction the projectile change its charge in one unit. Charge exchange reaction are posible in two channels: 1 Quasilastic Channel

6 In this nuclear reaction the projectile change its charge in one unit. Charge exchange reaction are posible in two channels: 1 Quasilastic Channel 2 Inelastic Channel: resonace formation.

7 Motivation 1 Nuclear medium properties of resonance Figure: Gardee C,Annu. Rev. Nucl. Part. Sci :

8 Motivation Using relativistic exotic projectiles 1 Nuclear medium properties of resonance

9 Motivation Using relativistic exotic projectiles 1 Nuclear medium properties of resonance 2 Energy dependece.

10 Motivation Using relativistic exotic projectiles 1 Nuclear medium properties of resonance 2 Energy dependece. 3 Density dependence, skin nuclei

11 Motivation Using relativistic exotic projectiles 1 Nuclear medium properties of resonance 2 Energy dependece. 3 Density dependence, skin nuclei 4 Sensitivity to neutron and proton distributions with peripheral collisions.

12 FRS Identification The FRS (FRagment Separator) is a high-resolution magnetic spectrometer, identifies all projectile residues that come of the reaction with the target. The identification is based in the behavior of charged particles moving in the presence of a magnetic field. Z 56 Cs Xe (1e) I (2e) I (1e)

13 Previous results A.U Xe(d,X) Cs velocity cm/ns A.U Xe(H,X) I velocity cm/ns Xe(Ti,X) Cs Xe(d,X) I A.U. 0.5 A.U velocity cm/ns velocity cm/ns

14 S364 Experimental Setup Primary Beam from SIS MeV/u scintillator SC Production target SCI1 ToF 1 MUSIC2 SCI2 ionization chamber IC position detector TPC Reaction target ToF 2 SCI4 MUSIC4 dispersive mid plane F2 Bρ Bρ ; Z Z final focus F4 Figure: s364 Experimetal Setup ; A A

15 Direct Beams: 124 Sn, 112 Sn 1 Reaction S0 2 Stable Beams

16 Direct Beams: 124 Sn, 112 Sn 1 Reaction S0 2 Stable Beams Secondary Targets: 118 Sn, 109 Sn 1 Reaction S2 2 Unstable Beams Sn 118 Sn Sn 109 Sn

17 Beam request: S0 reaction Target Depence: 1 Direct Beam: 124 Sn 2 Energy 1000MeV /u 3 Targets: C,CH 2,Cu,Sn,Ta,Pb 4 Rate Limit: 100KHz at MUSIC 1 5 Secondary target: OUT σ (mb) Total p-p cross section Elastic Inelastic Energy Depence: 1 Direct Beams: 124 Sn 2 Energy (MeV /u): 400, 600, 800, Target C E lab (MeV) Figure: Red line: Total Cross Section for N-N, Blue:Elastic, Green: Inelastic

18 Secondary Beams: 118 Sn, 109 Sn Production Target S2 reaction Secondary Targets: CH 2, C, 2 g cm 2 Rate Limit: proj s at SCl1 Removing the C contribution of CH 2, we can obtain proton (H) information Beam σ(mb) proj/s prod/s S 4 σ(mb) prod/h 124 Sn Sb Sn 118 I Sn Sb Sn 109 I

19 Beam time request:date: june,2011 Beam Measure Beam time 124 Sn FRS Calibrations 1 day 124 Sn empty 2h 124 Sn C 124 Sb 124 I 2h 124 Sn C,CH 2,Cu,Sn,Ta,Pb 8h 124 Sn 400,600,800 MeV 6h 118 Sn empty 2h 118 Sn C 118 Sb 118 I 6h 118 Sn CH Sb 118 I 6h 112 Sn FRS Calibrations 1 day 112 Sn empty 2h 112 Sn C 112 Sb 112 I 2h 109 Sn empty 2h 109 Sn C 109 Sb 109 I 6h 109 Sn CH Sb 109 I 6h

20 A.Kelic et. Al Physical review C 70, (2004) C.Gaarde,Annu.Rev.Nucl.Part.Sci : B. Ramstein European Physical Journal A 16 (2003) , see pg 1 N.Tsoulfanidis Measurent and Detection of Radiation. Taylor&Francis http : //root.cern.ch/root/htmldoc/tspectrum.html L.B Lucy,An iterative technique for the rectifiation of observed distributions, The Astronomical Journal Vol 79 num C.Amsleret al., Physics Letters B667,1 (2008)