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Max-Planck-Institut für Kernphysik, Heidelberg
Andreas Heusler
208Pb(p,p') via isobaric analog resonances in 209Bi and
207Pb(d,p)
High Resolution Particle Spectroscopy in 208Pb
with the Q3D Magnetic Spectrograph
of the Maier-Leibnitz-Laboratorium at Műnchen
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
particle-hole states
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
problems
mean distance predicted by schematic shell model for 4.6 < Ex < 6.1 MeV
~ 15 keV
[1967] 208Pb(p,p') @Ep=14-18 MeV 9 keV foto-emulsion [1982] 209Bi(d,3He) @Ed= 45 MeV 15 keV [1975] 208Pb(p,p') @Ep= 35 MeV 5-8 keV foto-emulsion [2001] 208Pb(p,p') @Ep= 22 MeV 4 keV [2001] 209Pb(d,p) @Ed= 22 MeV 4 keV but background from contaminations
particle-spectroscopy resolution
gamma-spectroscopy
resolution ≈ 2 keV but
difficult identification
[1996] 208Pb(p,p' γ) via IAR[1996] 207Pb(d,p γ) [1997] 209Bi(t,α γ)[1996] 208Pb(n,n' γ)
¿ methods to resolve doublets ? 10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Q3D magnetic spectrograph
14 MV tandem accelerator
Maier-Leibnitz-LaboratoriumLMU & TU München
detectortarget protons
(Quadrupol + 3 Dipoles)
Q D1 D2 D3
p'
p
p'
Θ
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Δ Ex = 7 keV
on j15/2 IAR
on d5/2 IAR
2∆Ex =3...8 keV
208Pb(p,p')
Z604
2∆Ex =3 keV
Ep = 16.390 MeV Θ = 138°
Ep = 16.500 MeV Θ = 138°
8+ 7+ 10+ L-I,II,III
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
isobaric analog resonance
828282
126 126 126
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
proton decay of isobaric analog resonance
p-h
82 82
126126
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
inelastic proton scattering via IAR
selective excitation in different IAR LJ
interference pattern in angular distribution
determine particle LJ in p-h configurations LJ x lj
determine parity (intruder)
determine range of spins abs(J - j) ≤ I ≤ J + j
determine spin [if single configuration: pure geometry]
determine spin by comparison to s.p. amplitude γ(lj)
determine amplitude of all p-h configurations LJ x lj
(exclude spin via unitarity considerations)
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
208Pb(p,p')
on d5/2 IAR Θ = 88°
on d3/2 IARon g7/2 IAR Θ = 138°
on g9/2 IAR Θ = 88°
4- d5/2 p3/2
2- d3/2 p1/2
1- d3/2 p1/2
4- g7/2 p1/2
3- d5/2 p3/2
Z560 1500cts
Z674 200cts
Z593 50cts
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
208Pb(p,p')
on d5/2 IAR Θ = 88°
on i11/2 IAR Θ = 29°
on g9/2 IAR Θ = 88°
6- g9/2 p3/2
4- d5/2 f5/2
Z223 200cts
Z605 300cts
Z593 200cts
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
208Pb(p,p')
on d5/2 IAR Θ = 48°
on s1/2 IAR Θ = 48°
on g7/2 IAR Θ = 88°
1- s1/2 p3/2
2- s1/2 p3/2
Z203 400cts
Z574 400cts
Z147 100cts
12C(p,p')
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
determination of parity
8+
7+
9+
7+
Ep [MeV]15 16 17 18
11 μb/sr
17 μb/sr
6 μb/sr
25 μb/sr
208Pb(p,p')
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
angular distributions of Pb(p,p') via g9/2 IAR
7-g9/2f7/2
8-g9/2f7/2
6-g9/2f7/2
5-g9/2f7/2
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
7+
4- d5/2 f5/2
6-
7-
ΔEx=0.4keV
5648.9
5649.3
4+
208Pb(p,p')
4- g9/2 f7/2
9+ j15/2 p3/2
on d5/2 IAR Θ = 138°
on j15/2 IAR Θ = 42°
on g9/2 IAR Θ = 88°
ΔEx = 4 & 4 keV
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
208Pb(p,p')
207Pb(d,p)
Ep = 17.96 MeV Θ = 138°
Ed = 22.00 MeV Θ = 30° 7+j15/2p1/2
8+j15/2p1/2
2-d5/2p1/2
2-d5/2p1/2
3-d5/2p1/2
3-d5/2 + g7/2p1/2
8+j15/2p1/2
14N(d,p)L-I,II,III L-I,II,III L-I,II,III
206Pb(d,p)
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
6.0
5.5
5.0
4.5
6.0
5.5
5.0
4.5
Ex[MeV]
5+
8+
7+
10+9+
SM SM expt expt (1- 4,6)(1- 3)
(1- 5) (1- 4)(1- 5)
SM expt (1,2,3,5,7)6+
4. ?
6. ?
5. ?
208Pb
identifiedstates
positiveparity
j15/2 xp3/2f 5/2p1/2
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Ex[MeV]
208Pb
identifiedstates
negativeparity
LJ xf7/2p3/2f5/2p1/2
7
6
5
4
3
7
6
5
4
0- 7- 8- 1- 2- 4- 6-
e x p e r i m e n ts h e l l m o d e l s h e l l m o d e l
?
??
?
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
matrix elements of the residual interactionamong particle-hole configurations
in 208Pb
E1 = 5280
E2 = 5599e2 = 5568
e1 = 5463
e3 = 6844
v22 = -10±10±20
v11 = -140±10±20
V12 = 110±10±15
level repulsion +v12 = -v21
level shift v11, v22
known states with spin 0-Ex [keV]
s1/2 p1/2
g9/2 h9/2
d5/2 f5/2
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
amplitudesof particle-hole configurations
in 208Pb
known states with spin 2-Ex [keV]
particle-hole
(d,p) (d,p) (d,3He) (p,p') via IAR 10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
10th ISSNP VIETRI SUL MARE, MAY 21-25, 2010: Andreas Heusler: High Resolution Particle Spectroscopy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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