Collaboration LPC-CHARISSA-DEMONCollaboration LPC-CHARISSA-DEMON

H Al Falou, JL Lecouey, F Carstoiu, H Al Falou, JL Lecouey, F Carstoiu, FM Marqués,FM Marqués, NAO …NAO …

Structure of Nuclei Beyond the DriplineStructure of Nuclei Beyond the Dripline

IntroductionIntroduction

Experimental Experimental ApproachApproach

““Selection Rules”,Selection Rules”,Backgrounds, …Backgrounds, …

N=7 : N=7 : 1010Li & Li & 99HeHe

Conclusions & PerspectivesConclusions & Perspectives

Structure Beyond the Neutron Dripline via Structure Beyond the Neutron Dripline via Intermediate-Energy Intermediate-Energy ““KnockoutKnockout”” && Breakup Breakup

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

LPC ProgrammeLPC Programme : : H Al Falou LPCC 07-03,H Al Falou LPCC 07-03, G Normand LPCC 04-03, JL Lecouey LPCC 02-03G Normand LPCC 04-03, JL Lecouey LPCC 02-03

43-68 MeV/nucleon43-68 MeV/nucleon

1-600 pps1-600 pps

-1n-1n ~ 50 - 200 mb ~ 50 - 200 mb

FWHM ~ 50 - 240 MeV/cFWHM ~ 50 - 240 MeV/c

InclusiveInclusive : : E Sauvan, et al., PLB 2000 ; PRC (2004)E Sauvan, et al., PLB 2000 ; PRC (2004)

Particle Stable Nuclei – Particle Stable Nuclei – ““KnockoutKnockout””/Nucleon Removal/Nucleon Removal

Strategy …Strategy …

““FastFast”” nucleon (proton) removal nucleon (proton) removal ℓℓ(n) (n) = 0 = 0 **

IFFIFF proj. structure known proj. structure known deduce structure of A-1 system deduce structure of A-1 system

(core (core-1-1 valence nucleon) valence nucleon)

Proton removal (SProton removal (Spp~15 MeV~15 MeV) from very neutron-rich beams) from very neutron-rich beams

systems beyond dripline – observe frag.+ n FSIsystems beyond dripline – observe frag.+ n FSI

* * M Zinser et al., PRL M Zinser et al., PRL 7575 (1995) 1719 (1995) 1719

L Chen et al. PLB L Chen et al. PLB 505505 (2001) 21 (2001) 21

Issues : ReactionIssues : Reaction StructureStructure ……

Projectile Projectile weakly boundweakly bound valence neutron valence neutron

relaxation of relaxation of ℓℓn n = 0 = 0

frag. recoil induced by proton removal frag. recoil induced by proton removal

scattering of valence neutron scattering of valence neutron

VALIDATE VALIDATE approach using approach using 1111Be beam (SBe beam (Snn = 0.5 MeV = 0.5 MeV))

In parallel explore In parallel explore evolution of N=7 g.s. parity inversionevolution of N=7 g.s. parity inversion

test of structure models test of structure models && input for input for

for 3-body modelling of for 3-body modelling of 1010He, He, 1111LiLi

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 ??

Experimental ApproachExperimental Approach

Fast nucleon removal from projectile with known structureFast nucleon removal from projectile with known structure+ inflight decay of unbound system+ inflight decay of unbound system

Vf

Vn

Vf-Vn

2nf VV21

dE

targettarget

Proj.

AZ A-1Z + n

dEFWHM

ResolutionResolutionExperimental Response FunctionExperimental Response Function

EfficiencyEfficiency

FWHM ~ 0.3 EFWHM ~ 0.3 Edd1/21/2

nn

JL Lecouey LPCC 02-03JL Lecouey LPCC 02-03

model distributions model distributions mustmust be be ““filteredfiltered”” through the simulation through the simulation

(Approx.) Selection Rules(Approx.) Selection Rules … …

(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 ]

well adapted to probing well adapted to probing low-lying s-wave strengthlow-lying s-wave strength

(ii) fragmentation (-xp,-xn) (ii) fragmentation (-xp,-xn) population via neutron-decay population via neutron-decay

of N+1 system of N+1 system

C(C(1414B,B,1010Li)X , C(Li)X , C(1414B,B,99He)X He)X ss1/21/2 + + pp1/21/2 + … + …

CAVEATCAVEAT**: decay of : decay of narrow resonancesnarrow resonances in N+1,2,… systems in N+1,2,… systems

Note -Note - E Edd lineshape dependent on initial statelineshape dependent on initial state (esp. for broad final states) (esp. for broad final states)

** EXAMPLE:EXAMPLE: C( C(1515B,B,1212Be+n) via Be+n) via 1414Be*(2Be*(2++))

““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, PLB672 (2009 6JL Lecouey et al, PLB672 (2009 6JL Lecouey, Few-Body Systems 34 (2004) 21JL Lecouey, Few-Body Systems 34 (2004) 21

““backgroundbackground”” ≡≡ sequential neutron decay/evaporation from PLF + continuum sequential neutron decay/evaporation from PLF + continuum

BACKGROUNDBACKGROUND : C( : C(1414B,B,66He+n)X – He+n)X – fragmentationfragmentation

JL Lecouey, LPCC T 02-03.JL Lecouey, LPCC T 02-03.

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

Note -Note - final lineshape Efinal lineshape Edd(frag+n) depends on projectile(frag+n) depends on projectile

1010Li : Low-Lying Level Scheme Li : Low-Lying Level Scheme **

** ““PartialPartial”” – also d( – also d(99Li,p) ; new LAND-GSI etc Li,p) ; new LAND-GSI etc

Theory: also MCSM Otsuka et al, … Theory: also MCSM Otsuka et al, … s-virtual Es-virtual Er r ~ ~ ћћ2 2 / 2a/ 2ass

1010Li : C(Li : C(1111Be,Be,99Li+n) Li+n) @@ 35 35 MeV/nucleon MeV/nucleon [-1p][-1p]

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

1010Li : C(Li : C(1111Be,Be,99Li+n) Li+n) @@ 35 35 MeV/nucleon MeV/nucleon [-1p][-1p]

s-wave [as-wave [ass = -17 = -17±±2 fm] + non-resonant continuum2 fm] + non-resonant continuum

H Al Falou LPCC 07-03H Al Falou LPCC 07-03

1010Li : C(Li : C(1414B,B,99Li+n) Li+n) @@ 35 35 MeV/nucleon MeV/nucleon [-2p,-2n][-2p,-2n]

s-wave [as-wave [ass = -10 = -10 ±±2 fm] + p-wave [E2 fm] + p-wave [Er r = 0.51, = 0.51, = 0.54 MeV] + background= 0.54 MeV] + background

H Al Falou LPCC 07-03H Al Falou LPCC 07-03[ Decay of [ Decay of 1111Li* & Li* & 1212Li … ? ]Li … ? ]

99He : He : Low-Lying Level Scheme Low-Lying Level Scheme **

** AlsoAlso IAS expts ; MUST (d,p) under analysis ; LAND-GSI Theory: also MCSM Otsuka et al., …IAS expts ; MUST (d,p) under analysis ; LAND-GSI Theory: also MCSM Otsuka et al., …

(

)((

)

)

99He : C(He : C(1111Be,Be,88He+n) He+n) @@ 35 35 MeV/nucleon MeV/nucleon [-1p][-1p]

uncorrelated distribution/event mixed distributionuncorrelated distribution/event mixed distribution

H Al Falou LPCC 07-03H Al Falou LPCC 07-03

99He : C(He : C(1111Be,Be,88He+n) He+n) @@ 35 35 MeV/nucleon MeV/nucleon [-1p][-1p]

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

99He : C(He : C(1414B,B,88He+n) He+n) @@ 35 35 MeV/nucleon MeV/nucleon [-3p,-2n][-3p,-2n]

uncorrelated distribution/event mixed distributionuncorrelated distribution/event mixed distribution

H Al Falou LPCC 07-03H Al Falou LPCC 07-03

99He : C(He : C(1414B,B,88He+n) He+n) @@ 35 35 MeV/nucleon MeV/nucleon [-3p,-2n][-3p,-2n]

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[ Decay of [ Decay of 1010He & He & 1111He … ? ]He … ? ]

Conclusions Conclusions && Perspectives Perspectives

• 1111Be proton knockout suggests that selection rule validBe proton knockout suggests that selection rule valid

spectroscopy possible beyond the dripline using spectroscopy possible beyond the dripline using

knockout from RNB … knockout from 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 ,,dd5/2 5/2 ?? ?? ]]

99He : He : low-lying s-wave strength (alow-lying s-wave strength (as s 0 fm) + E 0 fm) + Exx1.2 MeV1.2 MeV

(l>0) (l>0) N= 7 inversion … ?N= 7 inversion … ?

[ [ FSI << FSI << 99Li+n ??Li+n ?? ] ]

EXPT:EXPT: higher resolution higher resolution && statistics; improved neutron detection statistics; improved neutron detection && I IBB

Conclusions Conclusions && Perspectives Perspectives

validity/character of s-wave virtual states ??validity/character of s-wave virtual states ??

eg., deformed eg., deformed 99Li & Li & 1212Be cores Be cores

realistic realistic structurestructure + + reaction modellingreaction modelling needed needed

( (lineshape and cross sectionlineshape and cross section) including non-resonant) including non-resonant

continuum + other backgrounds … continuum + other backgrounds …

first step – estimate frag. recoil effectsfirst step – estimate frag. recoil effects

valence neutron scattering (valence neutron scattering (approx. free neutron scatteringapprox. free neutron scattering ?) ?)

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