collaboration lpc-charissa-demon h al falou, fm marqués, jl lecouey, na orr, … spectroscopy...
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Collaboration LPC-CHARISSA-DEMONCollaboration LPC-CHARISSA-DEMON
H Al Falou, FM Marqués, JL Lecouey, H Al Falou, FM Marqués, JL Lecouey, NA OrrNA Orr, …, …
Spectroscopy Beyond the Neutron Dripline: Spectroscopy Beyond the Neutron Dripline: 99He He && 1010LiLi
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““I have come 500 miles just to see a halo …I have come 500 miles just to see a halo …””
Who wrote and sang …Who wrote and sang …
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MotivationMotivation
Experimental Experimental ApproachApproach
Selection “Rules”Selection “Rules”
BackgroundsBackgrounds
N=7 : N=7 : 1010Li & Li & 99HeHe
ConclusionsConclusions
Spectroscopy Beyond the Neutron Dripline: Spectroscopy Beyond the Neutron Dripline: 99He & He & 1010LiLi
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The Light Neutron-Rich Nuclei …The Light Neutron-Rich Nuclei …
10Li
Structure =core+xnStructure =core+xn
… … driplines and beyond experimentally accessible, extreme test of models driplines and beyond experimentally accessible, extreme test of models
(shell model, shell model in continuum, (shell model, shell model in continuum, ““ab initioab initio””, cluster, etc), cluster, etc)
9He
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Light Unbound Neutron-Rich SystemsLight Unbound Neutron-Rich Systems
• input for 3-body modelsinput for 3-body models
3-body systems 3-body systems n-n and core-n interactions n-n and core-n interactions
1111Li : Li : 9 9Li-n interaction Li-n interaction spectroscopy of spectroscopy of 1010LiLi
1010He : He : 88He-n interaction He-n interaction spectroscopy of spectroscopy of 99HeHe
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N=7 1/2N=7 1/2++ – 1/2 – 1/2-- Level Inversion … Level Inversion …
PG Hansen et al.PG Hansen et al.
… … 1010Li Li && 99He ??He ??
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Experimental ApproachExperimental Approach
… … ““knockoutknockout”” or breakup + inflight decay or breakup + inflight decayprojectile structure knownprojectile structure known
Vf
Vn
Vf-Vn
2nf VV21
dE
targettarget
Proj.
AZ A-1Z + n
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DEMONDEMON
90 modules (90 modules (NE213NE213) )
ToF ToF && position position
nn ~ 10% ~ 10%
Kinematically “CompleteKinematically “Complete”” Measurement Measurement
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dEFWHM
ResolutionResolutionExperimental Response FunctionExperimental Response Function
EfficiencyEfficiency
FWHM ~ 0.3 EFWHM ~ 0.3 Edd1/21/2
nn
JL Lecouey LPCC 04-03JL Lecouey LPCC 04-03
model distributions model distributions mustmust be be ““filteredfiltered”” through the simulation through the simulation
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Selection Selection ““RulesRules” - ” - Sudden ApproximationSudden Approximation
(i)(i) 1 1 && 2-proton knockout 2-proton knockout llnn=0 proj. valence neutron config.=0 proj. valence neutron config.
C(C(1111Be,Be,1010Li)X ,C(Li)X ,C(1111Be,Be,99He)XHe)X ss1/2 1/2 [ [ 1111Be CBe C22S (S (ss1/21/2)) 0.8 ] 0.8 ]
(ii)(ii) fragmentation (-xp,-xn) fragmentation (-xp,-xn) valence neutron config. + others valence neutron config. + others
C(C(1414B,B,1010Li)X , C(Li)X , C(1414B,B,99He)X He)X ss1/21/2 + + pp1/21/2 + … + …
C( C(1212Be,Be,99He)X He)X ss1/21/2 + + pp1/21/2 + + dd5/25/2 + … + …
NB:NB: E Edd lineshape dependent on initial statelineshape dependent on initial state (esp. for broad final states) (esp. for broad final states)
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““backgroundbackground” ≡” ≡ non-resonant continuum non-resonant continuum event-mixed distribution * event-mixed distribution *
* ie., * ie., uncorrelateduncorrelated fragment-neutron pairs fragment-neutron pairs
EErr = 85 = 85 15 keV 15 keV
sp sp << 100 keV << 100 keV
uncorrelated uncorrelated 1515B+n distributionB+n distribution
BACKGROUNDBACKGROUND: C(: C(1717C,C,1515B+n)X – B+n)X – single-proton knockoutsingle-proton knockout
JL Lecouey et al, nucl-ex/0802.4225JL Lecouey et al, nucl-ex/0802.4225
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““backgroundbackground”” ≡≡ neutrons evaporated from PLF + continuum neutrons evaporated from PLF + continuum
BACKGROUNDBACKGROUND : C( : C(1414B,B,66He+n)X – He+n)X – fragmentationfragmentation
JL Lecouey, LPCC T 04-03.JL Lecouey, LPCC T 04-03.
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Scattering/Virtual s-wave StatesScattering/Virtual s-wave States
aass = 0 fm no FSI ; a = 0 fm no FSI ; ass << 0 fm stronger FSI << 0 fm stronger FSI
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1010Li : Low-Lying Level Scheme Li : Low-Lying Level Scheme **
* * ““PartialPartial”” – also d( – also d(99Li,p) etcLi,p) etc s-s-virtual virtual E Er r ~~ ћћ2 2 / 2a/ 2ass
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1010Li : C(Li : C(1111Be,Be,99Li+n) Li+n) @@ 35 35 MeV/nucleonMeV/nucleon
H Al Falou LPCC 07-03H Al Falou LPCC 07-03
uncorrelated / event-mixed distribution uncorrelated / event-mixed distribution **
** normalised for comparison at high E normalised for comparison at high Edd
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1010Li : C(Li : C(1111Be,Be,99Li+n) Li+n) @@ 35 35 MeV/nucleonMeV/nucleon
s-wave [as-wave [ass = -14 = -14±±2 fm] + non-resonant continuum2 fm] + non-resonant continuum
H Al Falou LPCC 07-03H Al Falou LPCC 07-03
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1010Li : C(Li : C(1414B,B,99Li+n) Li+n) @@ 35 35 MeV/nucleonMeV/nucleon
s-wave virtual state + p-wave [Es-wave virtual state + p-wave [Er r = 0.51, = 0.51, = 0.50 MeV] + background= 0.50 MeV] + background
H Al Falou LPCC 07-03H Al Falou LPCC 07-03
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99He : He : Low-Lying Level Scheme Low-Lying Level Scheme **
** 99Li IAS expts not shown ; Li IAS expts not shown ; [Set87, Boh88, Oer95][Set87, Boh88, Oer95] assignments tentative assignments tentative
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99He : C(He : C(1111Be,Be,88He+n) He+n) @@ 35 35 MeV/nucleonMeV/nucleon
uncorrelated distribution/event mixed distributionuncorrelated distribution/event mixed distribution
H Al Falou LPCC 07-03H Al Falou LPCC 07-03
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99He : C(He : C(1111Be,Be,88He+n) He+n) @@ 35 35 MeV/nucleonMeV/nucleon
s-wave [as-wave [ass = -3 ~ 0 fm (3 = -3 ~ 0 fm (3)] + non-resonant continuum)] + non-resonant continuum
H Al Falou LPCC 07-03H Al Falou LPCC 07-03
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99He : C(He : C(1414B,B,88He+n) He+n) @@ 35 35 MeV/nucleonMeV/nucleon
uncorrelated distribution/event mixed distributionuncorrelated distribution/event mixed distribution
H Al Falou LPCC 07-03H Al Falou LPCC 07-03
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99He : C(He : C(1414B,B,88He+n) He+n) @@ 35 35 MeV/nucleonMeV/nucleon
s-wave [as-wave [ass = -3 ~ 0 fm] + p-wave [E = -3 ~ 0 fm] + p-wave [Err = 1.2, = 1.2, = 1.0 MeV] + background= 1.0 MeV] + background
H Al Falou LPCC 07-03H Al Falou LPCC 07-03
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99He : C(He : C(1212Be,Be,88He+n) He+n) @@ 41 41 MeV/nucleonMeV/nucleon
s-wave [as-wave [ass = -10 fm] + p = -10 fm] + p1/21/2 [E [Err = 1.2 MeV] + (d = 1.2 MeV] + (d5/25/2) [E) [Err = 2.4 MeV] + background = 2.4 MeV] + background
G Normand LPCC 04-03G Normand LPCC 04-03
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Conclusions Conclusions && Perspectives Perspectives • spectroscopy beyond the dripline using breakup/knockout of RNB …spectroscopy beyond the dripline using breakup/knockout of RNB …
1010Li : Li : low-lying s-wave strength (alow-lying s-wave strength (as s = -14= -14±2±2 fm) fm)
low-lying p-wave resonance (E low-lying p-wave resonance (Err = 0.5 MeV) = 0.5 MeV)
N= 7 inversion confirmedN= 7 inversion confirmed
[ [ but … but … pp3/23/2ss1/2 1/2 ,,pp1/2 1/2 ,,dd5/25/2]]
99He : He : low-lying s-wave strength (alow-lying s-wave strength (as s 0 fm) + E 0 fm) + Exx1.2 & 2.4 MeV1.2 & 2.4 MeV
(l>0) (l>0) N= 7 inversion … ??N= 7 inversion … ??
[ [ FSI << FSI << 99Li+n ??Li+n ?? ] ] validity of s-wave virtual states (eg., deformed validity of s-wave virtual states (eg., deformed 99Li core) ??Li core) ??
more realistic more realistic structurestructure + + reaction modellingreaction modelling needed … needed … … including non-resonant continuum + other backgrounds … including non-resonant continuum + other backgrounds
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