Download mesons in the quark model

TAPS at the KVI in 2005
What are the physics goals?
What is the required setup?
What is the present status?
What still needs to happen?
Who is involved?
When do we plan to be ready?
1997 op het KVI
18/03/2004
H.L., TAPS at KVI in 2005
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proposals involving TAPS at KVI
prop # bremsstrahlung studies
117 shifts
method
R20
(A-)
p + A  p’ +  + X
The role of multiple scattering for soft
photon quenching
70 (88)
 in Pball or TAPS
p’ in Pball or BBS
R14
(B+)
d + 3He  4He + p + 
Test of soft-photon approximation for
bremsstrahlung in transfer reactions
22 (22)
 in Pball or TAPS
4He in BBS (ESN)
18/03/2004
H.L., TAPS at KVI in 2005
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proposals involving TAPS at KVI
prop # 0 production studies
+ 6Li  12C +  + 0
Pionic fusion: probe of subnucleonic d.o.f.
in nuclei
R19
A+
6Li
S42
A
3He
18/03/2004
+ 4He  7Be* + 0
+ 10B  12C +  + 0
Pionic fusion: comparison of different
spin/isospin channels
2H



60 shifts
method
40 (40)
12C
in BBS HI det.
 (0 ) in TAPS
0 in Pball (TAPS)
20 (20)
H.L., TAPS at KVI in 2005
fusion product in
BBS HI det.
 (0 ) in TAPS
0 in Pball (TAPS)
3
Interacting cluster model
Kajino, Toki, Kubo, PRC 35(87)1370
correlated microscopic cluster wave functions
using Resonating Group Method (RGM),
NN effective interaction + Coulomb
(check charge symmetry),
entrance channel distortions by
local imaginary potential WD
between clusters (from DWBA)
compared to
shell model wave functions
data suggest importance
of cluster correlations
18/03/2004
H.L., TAPS at KVI in 2005
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Effect of cluster structures on  production
p-wave
4He
7Be*
10B
d
n
3He
d
0
s-wave
9Be
12C*
very complementary!
0
similar processes but
with increasing complexity
in cluster structure:
3He
+ 9Be experiment
is very complementary,
crucial for cluster mechanism:
requires 39 additional shift!
18/03/2004
0
6Li
n
3He
12C*
6Li
d
d
0
12C*
contacts with theorists:
A. Volya (ANL), co-author
B. H. Toki (RMF +  field)
calculates cluster structure of 8Be
C. O. Scholten, R. Timmermans
(KVI contact and interest)
no final theory predictions yet,
theorists wait for systematic experiments!
H.L., TAPS at KVI in 2005
5
Planned setup of TAPS with Plastic Ball
at the BBS
Plastic Ball needs to be re-installed
... and equipped with Inner Shell
TAPS needs to be placed
New detectors for Heavy Ions in BBS
Li beam and target
Liquid He target
18/03/2004
H.L., TAPS at KVI in 2005
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results from experiment F09: d + p 
3He
+  (e+e-)
in BBS for 10o ring of  in PB
  (deg.)
locus of 2-body final state 3He + 
3He
   145o
 3He (deg.)
 3He (deg.)
Pball operation together with BBS has been proven
18/03/2004
H.L., TAPS at KVI in 2005
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Situation
around
target
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H.L., TAPS at KVI in 2005
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Inner Shell for Plastic Ball
complete set of detectors is ready:
70 elements of CsI,
with fixations for hanging inside Plastic Ball
18/03/2004
H.L., TAPS at KVI in 2005
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busy in front of the BBS
+ new detectors
for heavy ions
behind the BBS:
electronics
18/03/2004
H.L., TAPS at KVI in 2005
10
array of detector bars in BBS focal plane
array of 50 detectors
100 m plastic/CsI 1.3X4 cm2
for fusion products:
10 -- 30 MeV/u
ready to order
335 mm
momentum determination ( p/p 1 %)
by particle ID and detector position
18/03/2004
H.L., TAPS at KVI in 2005
B
11
Test results with C and O beam
energy resolution:
1% (rms)
position dependence:
0.3 – 0.9 %
18/03/2004
H.L., TAPS at KVI in 2005
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Liquid He target:
buffer cryostaat
L N2
in
He gas
out
3,4He
target gas
in
Vacuum Specials Co. (NL)
L 4He @ 1 bar, 4.2 K
Design is finalized:
pumping on the
cool-cel with liquid 4He
(50 mbar) we reach a
temperature of 2K
target tests planned in
summer 2004
pumping pipe
10 cm
mounting as
for LH2
target
valve adjusting
pumping speed
3,4He
cool-cel
50mbar, 2K
18/03/2004
target gas
target holder
H.L., TAPS at KVI in 2005
beamheight
13
plan for data acquisition for TAPS++
TAPS
LRC 2282 QDC
CC A2
BBS +
LRC 2282 QDC
LRC 2280
CC A2
CBD 8212
PBall + IShell
2280
LRC 4298
PBall + IShell
PBall + IShell
LRC4291 TDC
LRC 2280
CC A2
CBD 8212
Sync Mod
H.L., TAPS at KVI in 2005
TDC Dbus Interf.
LRC 4299
CC A2
Sync Mod
PCI-VME
18/03/2004
PCI-VME
LinuxPC
PCI-VME
PCI-VME
LinuxPC
PBall + IShell
+ PBall
+ BBS
HIdet. (FERA QDC)
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Manpower
Co-ordination physics and setup: H. Löhner
PlasticBall sub-project: J. Bacelar
Collaboration from outside KVI: TAPS collaboration, in particular
Giessen, Warsaw (Co-spokespersons), and Zagreb
Co-ordinator (design phase):
Henk Smit (engineer, drawing office)
Co-ordinator (He target):
Harry Timersma (research technician)
Co-ordinator (setup phase):
?
1 PhD position granted at KVI
1 PhD position hoped for at KVI
1 –3 PhD positions Giessen, Warsaw, Zagreb ?
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H.L., TAPS at KVI in 2005
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