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Production and Decay of Sub-U Isotopes by the Projectile Fragmentation of 1 AGeV 238U
Experiment S235FRS March 2003
Zhong Liu
University of Edinburgh
Collaboration
bull University of EdinburghZ Liu PJ Woods T Davinson A Robinson K Schmidt
bull University of Warsaw PolandZ Janas M Karny A Korgul J Kurcewicz M Pfuumltzner
bull GSI GermanyF Attallah J Doring H Geissel M Gorska M Hellstrom C Mazzocchi
I Mukha C Plettner E Roeckl K Summerer E Badura KH Behr A Bruumlhnle K Burkhard WHuumlller M Winkler H Weick
bull Argonne National Laboratory USAC Davids D Seweryniak
bull Oak Ridge National Laboratory USAR Grzywacz K Rykaczewki
Study of p-rich Trans-lead Nucleibull Fusion-evaporation
YuNovikov etal Nucl PhysA 697(2002)92 185Bi CNDavids et al Phys Rev Lett 76(1996)592
Projectile fragmentation of 238U
bull Advantages of PF (1) thick target (2) PID on event-by-event basis
Drawbacks with 238U beam (1) lower due to the strong influence of fission compared to Pb beam HG Clerc et Al NPA 590 (1995) 785
(2) charge state distribution C Scheidenberger et al NIM B 142(1998) 441
(3) huge energy deposition ratio between implant and decay ~ 20 GeV 1- 10 MeV
Feasibility
FRS Setup
Implant and Decay Setup
Particle Identification (A Q Z)
AQ (s2-s4) ( for Q1 = Q2)
Q(Z) difficult
Q fluctuates in materials at S0 S2 S4 2 MUSICs used with Nb foil in between optimised energy loss
the Q fluctuation B (E in S2 degrader) E in MUSICs and S2 degrader combined to resolve Q(Z)
(1) Select fully stripped ions in both stages
Q1=Q2-1
Q1-1=Q2
Z=89
Z=90
Z=91
Z=92
(2) Purification according to position at s4
Ac(Z=89)
(3) Identification of individual isotopes
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
Collaboration
bull University of EdinburghZ Liu PJ Woods T Davinson A Robinson K Schmidt
bull University of Warsaw PolandZ Janas M Karny A Korgul J Kurcewicz M Pfuumltzner
bull GSI GermanyF Attallah J Doring H Geissel M Gorska M Hellstrom C Mazzocchi
I Mukha C Plettner E Roeckl K Summerer E Badura KH Behr A Bruumlhnle K Burkhard WHuumlller M Winkler H Weick
bull Argonne National Laboratory USAC Davids D Seweryniak
bull Oak Ridge National Laboratory USAR Grzywacz K Rykaczewki
Study of p-rich Trans-lead Nucleibull Fusion-evaporation
YuNovikov etal Nucl PhysA 697(2002)92 185Bi CNDavids et al Phys Rev Lett 76(1996)592
Projectile fragmentation of 238U
bull Advantages of PF (1) thick target (2) PID on event-by-event basis
Drawbacks with 238U beam (1) lower due to the strong influence of fission compared to Pb beam HG Clerc et Al NPA 590 (1995) 785
(2) charge state distribution C Scheidenberger et al NIM B 142(1998) 441
(3) huge energy deposition ratio between implant and decay ~ 20 GeV 1- 10 MeV
Feasibility
FRS Setup
Implant and Decay Setup
Particle Identification (A Q Z)
AQ (s2-s4) ( for Q1 = Q2)
Q(Z) difficult
Q fluctuates in materials at S0 S2 S4 2 MUSICs used with Nb foil in between optimised energy loss
the Q fluctuation B (E in S2 degrader) E in MUSICs and S2 degrader combined to resolve Q(Z)
(1) Select fully stripped ions in both stages
Q1=Q2-1
Q1-1=Q2
Z=89
Z=90
Z=91
Z=92
(2) Purification according to position at s4
Ac(Z=89)
(3) Identification of individual isotopes
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
Study of p-rich Trans-lead Nucleibull Fusion-evaporation
YuNovikov etal Nucl PhysA 697(2002)92 185Bi CNDavids et al Phys Rev Lett 76(1996)592
Projectile fragmentation of 238U
bull Advantages of PF (1) thick target (2) PID on event-by-event basis
Drawbacks with 238U beam (1) lower due to the strong influence of fission compared to Pb beam HG Clerc et Al NPA 590 (1995) 785
(2) charge state distribution C Scheidenberger et al NIM B 142(1998) 441
(3) huge energy deposition ratio between implant and decay ~ 20 GeV 1- 10 MeV
Feasibility
FRS Setup
Implant and Decay Setup
Particle Identification (A Q Z)
AQ (s2-s4) ( for Q1 = Q2)
Q(Z) difficult
Q fluctuates in materials at S0 S2 S4 2 MUSICs used with Nb foil in between optimised energy loss
the Q fluctuation B (E in S2 degrader) E in MUSICs and S2 degrader combined to resolve Q(Z)
(1) Select fully stripped ions in both stages
Q1=Q2-1
Q1-1=Q2
Z=89
Z=90
Z=91
Z=92
(2) Purification according to position at s4
Ac(Z=89)
(3) Identification of individual isotopes
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
Projectile fragmentation of 238U
bull Advantages of PF (1) thick target (2) PID on event-by-event basis
Drawbacks with 238U beam (1) lower due to the strong influence of fission compared to Pb beam HG Clerc et Al NPA 590 (1995) 785
(2) charge state distribution C Scheidenberger et al NIM B 142(1998) 441
(3) huge energy deposition ratio between implant and decay ~ 20 GeV 1- 10 MeV
Feasibility
FRS Setup
Implant and Decay Setup
Particle Identification (A Q Z)
AQ (s2-s4) ( for Q1 = Q2)
Q(Z) difficult
Q fluctuates in materials at S0 S2 S4 2 MUSICs used with Nb foil in between optimised energy loss
the Q fluctuation B (E in S2 degrader) E in MUSICs and S2 degrader combined to resolve Q(Z)
(1) Select fully stripped ions in both stages
Q1=Q2-1
Q1-1=Q2
Z=89
Z=90
Z=91
Z=92
(2) Purification according to position at s4
Ac(Z=89)
(3) Identification of individual isotopes
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
FRS Setup
Implant and Decay Setup
Particle Identification (A Q Z)
AQ (s2-s4) ( for Q1 = Q2)
Q(Z) difficult
Q fluctuates in materials at S0 S2 S4 2 MUSICs used with Nb foil in between optimised energy loss
the Q fluctuation B (E in S2 degrader) E in MUSICs and S2 degrader combined to resolve Q(Z)
(1) Select fully stripped ions in both stages
Q1=Q2-1
Q1-1=Q2
Z=89
Z=90
Z=91
Z=92
(2) Purification according to position at s4
Ac(Z=89)
(3) Identification of individual isotopes
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
Implant and Decay Setup
Particle Identification (A Q Z)
AQ (s2-s4) ( for Q1 = Q2)
Q(Z) difficult
Q fluctuates in materials at S0 S2 S4 2 MUSICs used with Nb foil in between optimised energy loss
the Q fluctuation B (E in S2 degrader) E in MUSICs and S2 degrader combined to resolve Q(Z)
(1) Select fully stripped ions in both stages
Q1=Q2-1
Q1-1=Q2
Z=89
Z=90
Z=91
Z=92
(2) Purification according to position at s4
Ac(Z=89)
(3) Identification of individual isotopes
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
Particle Identification (A Q Z)
AQ (s2-s4) ( for Q1 = Q2)
Q(Z) difficult
Q fluctuates in materials at S0 S2 S4 2 MUSICs used with Nb foil in between optimised energy loss
the Q fluctuation B (E in S2 degrader) E in MUSICs and S2 degrader combined to resolve Q(Z)
(1) Select fully stripped ions in both stages
Q1=Q2-1
Q1-1=Q2
Z=89
Z=90
Z=91
Z=92
(2) Purification according to position at s4
Ac(Z=89)
(3) Identification of individual isotopes
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
(1) Select fully stripped ions in both stages
Q1=Q2-1
Q1-1=Q2
Z=89
Z=90
Z=91
Z=92
(2) Purification according to position at s4
Ac(Z=89)
(3) Identification of individual isotopes
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
(2) Purification according to position at s4
Ac(Z=89)
(3) Identification of individual isotopes
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
(3) Identification of individual isotopes
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
Production yields for Pa Th and Ac (preliminary)
Z=91Z=90Z=89
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
Some Perspectives
Near future 238U beam intensity of 109 pps
new Ac (Z=89) isotopes
emitters 205 204Ac 100 ndash 1000 ions shift
proton emitters 203Ac ~50 ions shift
201Ac ~5 ions shift
Farther future
DSSD equipped with fast-reset PA
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline
Summarybull PF of 238U more favorable for low Z sub-U isotopes PID production yield PF of 238U has reached as far as the fusion evaporation reactions for Ac bull Implant-decay correlations an existing detection system works HI rate in Si-stack 102 ndash 103 pps Imp Rate 1 ndash 102 pps decay rate 1-10 ppsbull t12 range 101 ndash 102 ms bad energy resolution (FWHM~100 keV) high radioactivity background
Perspectives with higher beam intensity and DSSD PF of 238U will provide new opportunity for study of sub-U isotopes beyond the p-dripline