b mouginot ipno phd director f azaiez s franchoo n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
B.MOUGINOT IPNO PHD director : F. AZAIEZ, S. FRANCHOO PowerPoint Presentation
Download Presentation
B.MOUGINOT IPNO PHD director : F. AZAIEZ, S. FRANCHOO

Loading in 2 Seconds...

play fullscreen
1 / 22

B.MOUGINOT IPNO PHD director : F. AZAIEZ, S. FRANCHOO - PowerPoint PPT Presentation


  • 115 Views
  • Uploaded on

B.MOUGINOT IPNO PHD director : F. AZAIEZ, S. FRANCHOO. Giant Pairing Vibration : Experimental Overview. How to populate a O+ state in Nuclei ?. Giant Pairing Vibration. GPV Mode : Collective Excitation of Pair in the Next Major Shell. Next Major Shell. Low-lying 0+ Excitation.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'B.MOUGINOT IPNO PHD director : F. AZAIEZ, S. FRANCHOO' - hector-dominguez


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
b mouginot ipno phd director f azaiez s franchoo
B.MOUGINOT

IPNO

PHD director : F. AZAIEZ, S. FRANCHOO

Giant Pairing Vibration :

Experimental Overview

slide2

How to populate a O+ state in Nuclei ?

Giant Pairing Vibration

GPV Mode : Collective Excitation of Pair

in the Next Major Shell

Next Major Shell

Low-lying 0+ Excitation

First 0+ excited state

A Higher excited 0+

Ground State 0+

slide3

Giant Pairing Vibrations

GPV is a Collective mode

GPV

>Pairing vibrations : L=0

>Sensitive to Pairing interaction

> Should lie

at high excitation energy

> 2 nucleon transfer channel selective for pairing vibration

ex (p,t) reaction

E. Khan PRC69(2004)

slide4

Overview of (p,t) reactions

208Pb (p,t) 206Pb

51.9MeV protons at Institute of Nuclear Study

Data recorded at 8°- 65°

E* range : 0 - 10 MeV

Orihara Phys.Rev. C 9(1974)266

35MeV protons at MSU cyclotron :

Data recorded at 6° 14° 30°

E* range : 0 - 7 MeV

Lanford Phys.Rev. C 16(1977)988

slide5

208Pb (p,t) 206Pb

40 MeV protons at Indiana University Cyclotron (IUCF)‏

Position sensitive chamber

at the focal plane of the spectrograph

>Data recorded at 7°- 35°

E* range : 0 - 5 MeV

Shepard Nucl.Phys. A 322(1979)‏

51.9 MeV protons at Institute of Nuclear Study Tokyo University

Array of 200 proportional counters

at the focal plane of the spectrometer

>Data recorded at 2°- 60°

E* range : 0 - 6 MeV

Takahashi Phys.Rev.C 27(1983)‏

slide6

208Pb (p,t) 206Pb

168 MeV protonsat K220 Orsay Synchrocyclotron

Data recorded at 2°- 18°

E* range : 0 - 12 MeV

Gerlic Phys.Rev. C 39(1989)‏

120 MeV protons at IUCF

Vertical-wire Drift Chamber

at focal plane of K600 spectrometer

Data recorded at 7°- 34°

E* range : 0 - 7 MeV

Mihailidis Phys.Rev.C 64(2001)‏

slide7

120Sn (p,t) 118Sn

40 MeV protons at University of Minnesota linear accelerator

8 Plastic scintillators

at the focal plane of the spectrometer

E* range : 0 - 11 MeV

Data recorded at 7°-30°

Bassani Phys.Rev. 139(1965)‏

slide8

0

250

0

120,122Sn (p,t) 118,120Sn

E* range : 0 - 20 MeV

42 MeV protons at Jefferson lab

resistive-wire proportional counter

at focal plane of Enge spectrometer

Data recorded at 10°- 45°

Crawley et al. Phys.Rev.Lett. 39(1977)33

89MeV protons at IUCF

Data recorded at 15°- 45°

E* range : 0 - 50 MeV

Crawley et al. Phys.Rev. C 22(1980)‏

slide9

Why revisit (p,t) reactions for GPV?

On 208Pb :

>51.9 MeV proton at 8°- 65°:Orihara Phys.Rev. C 9(1974)266

>35 MeV proton at 6° 18° 30° :Lanford Phys.Rev. C 16(1977)988

>40 MeV proton at 7°- 35° : Shepard Nucl.Phys. A 322(1979)‏

>51.9 MeV proton at 6° 18° 30° : Takahashi Phys.Rev.C 27(1983)‏

>168 MeV proton at 2°-18° : Gerlic Phys.Rev. C 39(1989)‏

>120 MeV proton at 7°-34° : Mihailidis Phys.Rev.C 64(2001)‏

GPV predicted at 10-20MeV

>wrong Energy Range

On 120Sn :

>40 MeV proton at 7°- 30° : Bassani Phys.Rev. 139(1965)‏

>42 MeV proton at 10°- 45° : Crawley et al. Phys.Rev.Let. 39(1977)33

>89MeV proton at 15°- 45°: Crawley et al. Phys.Rev. C 22(1980)‏

No experiment at the right angle and/or the right energy !!

0°or very near 0°& 60 MeV

slide10

Our recent work

At iThemba (South-Africa) :

208Pb(p,t)206Pb Q = -5.62 MeV

120Sn(p,t)118Sn Q = -7.111 MeV

Spectrometer at 7°

slide11

Our recent work

p (208Pb,206Pb) t & p (120Sn,118Sn) t

Target : 208Pb & 120Sn

Proton beam

At 60 MeV

tritons

2 Week-ends

B

Spectrometer at 7°

Selection of B window (5-7MeV)‏

1 Wire Chamber :

position of the light ejectile - triton energy

1 Paddle :

dE/TOF – triton selection

thickness 6.4mm

slide12

7/2-

5/2-

Without Gate

3/2-

208Pb(p,d)207Pb Ground State

13/2+

Gate on Deuterons

E paddle1

12C(p,t)‏

Gate on Tritons

TOF

16O(p,t)‏

triton

deuteron

Exemple for 41MeV setting

slide13

No gate:

Tritons acceptance ratio :

Deuterons acceptance ratio :

E paddle1

gated on tritons:

12C(p,t)‏

16O(p,t)‏

TOF

Exemple for 41MeV setting

slide15

Excitation Spectrum of 206Pb all fields superimposed

Excited state of 207Pb

Excited state of 206Pb

10C Ground state

14O Ground state

So far no indication of bump or broad structure in the 206Pb spectrum

slide17

N=70

Deephole states

Excitation Spectrum of120Sn(p,t) :

A hint for GPV in 120Sn: observation of cross-section enhancement

(weak bump) at Ex=12MeV?

The GPV? If yes, should increase at 0°

GPV?

Next Move :in SPRING 2009

120Sn(p,t)118Sn & 208Pb(p,t)206Pb

proton beam @ 60 MeV

K600 spectrometer @0°

slide18

Futur plans and improvments?

Thank you

iThemba labs

slide20

N=70

Deephole states

Excitation Spectrum of1118Sn(p,t) :

A hint for GPV in 120Sn: observation of cross-section enhancement

(weak bump) at Ex=12MeV?

The GPV? If yes, should increase at 0°

GPV?

slide22

Futur plans and improvments?

At iThemba :

208Pb(p,t)206Pb Q = -5.62 MeV

120Sn(p,t)118Sn Q = -7.111 MeV

GPV : L = 0 pairing mode

Spectrometer at 0°