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