S364 Experiment: Resonance in Isobaric Charge-Exchange reactions Jossitt W. Vargas Cruz GENP,Universidad Santiago de Compostela, Santiago de Compostela, 15782 Spain May 19, 2011
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.
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
In this nuclear reaction the projectile change its charge in one unit. Charge exchange reaction are posible in two channels:
In this nuclear reaction the projectile change its charge in one unit. Charge exchange reaction are posible in two channels: 1 Quasilastic Channel
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.
Motivation 1 Nuclear medium properties of resonance Figure: Gardee C,Annu. Rev. Nucl. Part. Sci. 1991.41:187-218
Motivation Using relativistic exotic projectiles 1 Nuclear medium properties of resonance
Motivation Using relativistic exotic projectiles 1 Nuclear medium properties of resonance 2 Energy dependece.
Motivation Using relativistic exotic projectiles 1 Nuclear medium properties of resonance 2 Energy dependece. 3 Density dependence, skin nuclei
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.
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 55 54 Xe (1e) I (2e) I (1e) 53 52 51 50 49 2.45 2.5 2.55 2.6 2.65
Previous results A.U. 14 12 10 8 6 4 2-6 10 Xe(d,X) Cs 0-0.2-0.15-0.1-0.05 0 0.05 velocity cm/ns A.U. 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0-6 10 Xe(H,X) I -0.15-0.1-0.05 0 0.05 velocity cm/ns -6 10 Xe(Ti,X) Cs -6 10 Xe(d,X) I A.U. 0.5 A.U. 4 0.4 3.5 3 0.3 2.5 2 0.2 1.5 0.1 1 0.5-0.15-0.1-0.05 0 0.05 velocity cm/ns 0-0.15-0.1-0.05 0 0.05 velocity cm/ns
S364 Experimental Setup Primary Beam from SIS 124Sn@1000 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 2 10 4 ; Z Z final focus F4 Figure: s364 Experimetal Setup 7 10 3 ; A A 2.4 10 3
Direct Beams: 124 Sn, 112 Sn 1 Reaction S0 2 Stable Beams
Direct Beams: 124 Sn, 112 Sn 1 Reaction S0 2 Stable Beams Secondary Targets: 118 Sn, 109 Sn 1 Reaction S2 2 Unstable Beams 3 124 Sn 118 Sn 4 112 Sn 109 Sn
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) 70 60 50 40 30 20 10 Total p-p cross section Elastic Inelastic Energy Depence: 1 Direct Beams: 124 Sn 2 Energy (MeV /u): 400, 600, 800, 1000 3 Target C 0 0 500 1000 1500 E lab (MeV) Figure: Red line: Total Cross Section for N-N, Blue:Elastic, Green: Inelastic
Secondary Beams: 118 Sn, 109 Sn Production Target S2 reaction Secondary Targets: CH 2, C, 2 g cm 2 Rate Limit: 3.7 10 5 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 19 2.3 10 8 2.96 10 5 118 Sb 0.5 60020 118 Sn 118 I 0.01 1240 112 Sn 5.6 8 10 8 2.98 10 5 109 Sb 0.5 60271 109 Sn 109 I 0.01 1107 http://www.usc.es/genp/s364.html
Beam time request:date: 20-25 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 2 118 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 2 109 Sb 109 I 6h
http://www.usc.es/genp/s364.html A.Kelic et. Al Physical review C 70, 064608 (2004) C.Gaarde,Annu.Rev.Nucl.Part.Sci 1991. 41:187-218. B. Ramstein European Physical Journal A 16 (2003) 583-597, see pg 1 N.Tsoulfanidis Measurent and Detection of Radiation. Taylor&Francis. 1995 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 6 1974. C.Amsleret al., Physics Letters B667,1 (2008)