First results of reactions induced by exotic beams in
the region of 11Be with CHIMERA array
EURORIB'10 -Lamoura, Jura, France June 6th -11th 2010
L. Grassi – INFN, Sezione di CataniaUniversità 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
Si CsI(Tl)
TOF-EΔE-E
PSD CsI
TOF
40Ar+Pety 20 MeV·A
E (M
eV)
Rise Time (ns)
Z=2
Z=6
Z=10
124Sn+64Ni 35 MeV·Aθ=10°
PSD Si
CHIMERA Detection TechniquesDE
(MeV
)
TOF(channel)
Z=10
Fragmentation Beams Tagging System
Tagging System test with a-source
By using coincidences between MCP and one pixel in the silicon detector, we obtain a time resolution better than 500 psec
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
Fragmentation beams on CHIMERA: 11Be - 12B setting
13C primary beam 9Be target (1,5 mm thickness ) at 55 MeV/A
11Be 10 kHz
11Be
8Li6He
12Be
9Li
10Be
7Li4He
DE (M
eV)
TOF (ns)
9Be8Li
4He
12B
10Be
7Li
11B13B
DE (M
eV)
TOF (ns)
12B 80 kHz
18O primary beam
magnet setting on 11Be
strip 140 mm thick
Fragmentation beams on CHIMERA: 18O - 16O primary beams
11Be 3 kHz
16C
13B
10Be
7Li
11Be10Be
8Li6He
charge12
3
4
5
mass
10
11Z=4
Fragmentation beams on CHIMERA: identification test
DE(c
h)DE
(MeV
)
T (ns)
Si- CsI(Tl)DE-E
Tel 66 4.1°
DSSD MCP DE/TOF
13C primary beam at 55 MeV/A
E (ch)
11Be
8Li6He
12Be10Be
7Li4He
DE
(MeV
)
TOF (ns)
11Be
Tagged beam Target p
p
transfer reactions study induced on proton and deuteron targets
CHIMERA 4p multidetector kinematical coincidence
kinematical coincidences technique
10Be
d
Tel 802 (q=58°) Silicon energy
Method capability with the reaction 7Li+p at 52 MeV
Tel 802 (q=58°) Silicon energy
0
20
40
60
80
100
120
140
116 118 120 122 124 126 128 130qcm
7Li+p-->p'
0.47 MeVaverage
ds/dw
(arb
.un.
)
Df=180°
kinematical coincidence technique
Tel 117 (q=6.4°) Silicon energy
Tel 117 (q=6.4°) silicon energy
E7L
i (M
eV)
Ep (MeV)
7Lip
CHIMERA detects charge particlesneutrons make some reactions inside CsI producing g, p, a
It is very interesting to see the reaction
Tel 117 (q=6.4°) silicon energy Tel 624 (q=25.5°) CsI(Tl) energy
Df=180°
p(7Li,7Be)n
kinematical coincidence technique
E(channel)
DE(c
hann
el)
E(channel)
Kinematical coincidences – preliminary results
elastic12B+d
Coincidences between telescopes with Df=180°Tel 38(3.1°) - 870(66°)
Tel 38(3.1°)Target CD beam setting on 12B
E(channel)
DE(c
hann
el)
Tel 38(3.1°)-875(66°) Df=215°
E(channel)
DE(c
hann
el)
16C excite state 1.7 MeV
E(channel)
16C+dRing 2I (3.1°)
coin withring 15(74°)ring 14 (66°)
10Be+pRing 2I (3.1°)
coin withring 15(74°)ring 14 (66°)
16C+d Ring 2E(4.1°)
coin withring15 (74°)ring 14(66°)
Kinematical coincidences – preliminary results
E(channel)
E(channel)
Transfer reactionsB. B. Back et al.,
PHYSICAL REVIEW LETTERS 104, 132501 (2010)
V. Lapoux et al, PHYSIC LETTERS B 658 (2008) 198-202
J.S. Winfield et al.Nuclear Physics A 683 (2001) 48–78
35.3 MeV/A
6,2 MeV/A7,4 MeV/A
Transfer reactionsp(11Be, 10Be)d at 48 MeV/Ad(10Be, 11Be)p at 58 MeV/A
d(12B, 11Be) 3He at 47 MeV/Ap(13B, 11Be) 4He at 52.4 MeV/A
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.
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
EXOCHIM collaboration