EURORIB'10 -Lamoura, Jura, France
June 6th -11th 2010
First results of reactions induced
by exotic beams in the region of
11Be
with CHIMERA array
L. Grassi – INFN, Sezione di Catania
Università degli Studi di Catania
OUTLINE

Fragmentation beams at LNS

Chimera characteristics and detection techniques

Tagging system

First experiments with 13C, 16O, 18O primary
beams at 55 MeV/A

Kinematical coincidence technique and its capabilities

Preliminary and incoming results
Fragmentation beams at INFN-LNS in Catania
Production Target
CHIMERA Detection Techniques
40Ar+Pety
20 MeV·A
E (MeV)
PSD Si
Si CsI(Tl)
PSD CsI
Z=10
Z=6
Z=2
ΔE-E
Rise Time (ns)
TOF
TOF-E
124Sn+64Ni
DE (MeV)
35 MeV·A
θ=10°
TOF(channel)
Z=10
Fragmentation Beams Tagging System
Tagging System test with a-source
At the entrance of the CHIMERA
scattering chamber, we mounted
a-source,
MCP
and
DSSSS
(16x16 strips, thickness 140 mm).
The base of flight is 70 cm
By using coincidences between
MCP and one pixel in the silicon
detector, we obtain a time
resolution better than 500 psec
Fragmentation beams on CHIMERA:
-
12B
setting
primary beam 9Be target (1,5 mm thickness ) at 55 MeV/A
11Be
12B
DE (MeV)
DE (MeV)
13C
11Be
12Be
11B
10Be
10Be
9Be
9Li
7Li
8Li
6He
4He
10 kHz
8Li
7Li
4He
TOF (ns)
TOF (ns)
11Be
13B
12B
80 kHz
Fragmentation beams on CHIMERA:
18O
18O
primary beam
magnet setting on
16C
11Be
strip 140 mm thick
13B
11Be
3 kHz
10Be
7Li
-
16O
primary beams
Fragmentation beams on CHIMERA: identification test
DE(MeV)
11Be
10Be
8Li
6He
DSSD MCP
DE/TOF
1
charge
4
DE(ch)
T (ns)
2
3
5
10
Si- CsI(Tl)
DE-E
Tel 66 4.1°
Z=4
11
E (ch)
13C
primary beam at 55 MeV/A
mass
kinematical coincidences technique
DE (MeV)
transfer reactions study induced on proton and deuteron targets
Tagged beam
Target p
11Be
12Be
10Be
11Be
7Li
4He
10Be
p
8Li
6He
d
TOF (ns)
CHIMERA 4p multidetector  kinematical coincidence
kinematical coincidence technique
Method capability with the reaction 7Li+p at 52 MeV
Df=180°
p
7Li
7Li+p-->p'
140
120
Ep (MeV)
100
ds/dw (arb.un.)
E7Li (MeV)
Tel 117 (q=6.4°)
Tel 117 (q=6.4°)
Silicon energy
silicon energy
Tel 802 (q=58°) Silicon energy
80
0.47 MeV
average
60
Tel 802 (q=58°) Silicon energy
40
20
0
116
118
120
122
124
q cm
126
128
130
kinematical coincidence technique
It is very interesting to see the reaction p(7Li,7Be)n
CHIMERA detects charge particles
neutrons make some reactions inside CsI producing g, p, a
Df=180°
Tel 117 (q=6.4°) silicon energy
Tel 624 (q=25.5°) CsI(Tl) energy
DE(channel)
Kinematical coincidences – preliminary results
elastic
12B+d
E(channel)
Tel 38(3.1°)
Target CD beam setting on
12B
Coincidences between telescopes
with Df=180°
Tel 38(3.1°) - 870(66°)
DE(channel)
E(channel)
E(channel)
Tel 38(3.1°)-875(66°)
Df=215°
Kinematical coincidences – preliminary results
16C+d
16C+d
Ring 2E(4.1°)
coin with
ring15 (74°)
ring 14(66°)
Ring 2I (3.1°)
coin with
ring 15(74°)
ring 14 (66°)
E(channel)
10Be+p
Ring 2I (3.1°)
coin with
ring 15(74°)
ring 14 (66°)
E(channel)
16C
excite state 1.7 MeV
E(channel)
Transfer reactions
B. B. Back et al.,
PHYSICAL REVIEW LETTERS 104, 132501 (2010)
7,4 MeV/A
6,2 MeV/A
Transfer reactions
p(11Be,
10Be)d
at 48 MeV/A
d(10Be,
11Be)p
at 58 MeV/A
d(12B,
11Be) 3He
at 47 MeV/A
p(13B, 11Be) 4He at 52.4 MeV/A
35.3 MeV/A
V. Lapoux et al, PHYSIC LETTERS B 658 (2008) 198-202
J.S. Winfield et al.
Nuclear Physics A 683 (2001) 48–78
Angular distribution
Elastic scattering (~ 50 MeV/A)
CONCLUSION
• Trough kinematical coincidence we’re going to study
transfer reactions with light exotic beams
• On June 2010 we’ll have also beam 9Li on 5.5 MeV/A
by LNS-EXCYT facilities
• Next improvement to detect particles at 0°
• New experiments by using fragmentation beams at LNS
(primary beam 36Ar to produce 32,33Ar neutron poor beams)
• Exotic beams delivered by SPES at LNL.
EXOCHIM collaboration
F.AMORINIa, A.ANZALONEa, L.AUDITOREb, G.CARDELLAc, S.CAVALLAROa,d,
M.B.CHATTERJEEe, E.DE FILIPPOc, E.GERACIc,d, L.GRASSIc,d, A.GRZESZCZUKi,
P.GUAZZONIl, J.HANa, E.LA GUIDARAc,f, G.LANZALONEa,f, I.LOMBARDOa,d, S.LO
NIGROc,d, D.LORIAb, C.MAIOLINOa, M. PAPAc ,A.PAGANOb, S.PIRRONEc, G.POLITIc,d,
F.PORTOa,d, F.RIZZOa,d, E.ROSATOm, P.RUSSOTTOa,d, A.TRIFIRÒb, M.TRIMARCHIb,
G.VERDEc, M.VIGILANTEm, L.ZETTAl
(a) INFN - Lab. Nazionali del Sud, Catania, Italy; (b) INFN - Gruppo collegato di Messina and
Dipartimento di Fisica, Università di Messina, Italiy; (c) INFN - Sezione di Catania, Italy; (d) Dip. di
Fisica e Astronomia, Università di Catania, Italy; (e) Saha Institute of Nuclear Physics, Kolkata,
India; (f) CSFNSM, Catania, Italy;(g) Università Kore di Enna, Enna, Italy; (h) Institute de Physique
Nucleaire d'Orsay, CNRS-IN2P3, Orsay Cedex, France; (i) Institute of Physics, University of Silesia,
Katowice, Poland; (l) INFN - Sezione di Milano and Dipartimento di Fisica, Università di Milano,
Itally; (m) INFN - Sezione di Napoli and Dipartimento di Fisica Università Federico II, Napoli, Italy