high resolution particle spectroscopy in 208pb with the ......207pb(d,p) high resolution particle...

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


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


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


isobaric analog resonance

828282

126 126 126


proton decay of isobaric analog resonance

p-h

82 82

126126


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)


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


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


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')


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')


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


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


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)


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


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

?

??

?


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


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

high resolution particle spectroscopy in 208pb with the ......207pb(d,p) high resolution particle...

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