8πLP-CORSET TOF Spectrometer for FF8πLP-CORSET TOF Spectrometer for FF

A. Brondi, G. La Rana, R. Moro, M.Trotta, E. Vardaci,INFN and Dipartimento di Scienze Fisiche dell’Università di Napoli

A. Chizhov, G.N. Kniajeva, E.M. KozulinFlerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna

M. Cinausero, E. Fioretto, P.F. Mastinu, G. Prete, V. RizziLaboratori Nazionali di Legnaro

N. Gelli, F. LucarelliINFN and Dipartimento di Fisica dell’Università di Firenze

FIESTAFIssion of Excited Systems at Tandem-Alpi

1. Fission time scale;

2. Strength and Nature of dissipation: one-body or two-body;

3. Dependence of the viscosity on the temperature and on the shape.

1. Fission time scale;

2. Strength and Nature of dissipation: one-body or two-body;

3. Dependence of the viscosity on the temperature and on the shape.

• Dinamica della Fissione in sistemidi fissilita’ intermedia e in sistemipesanti;

• Dipendenza della densita’ dei livellidall’isospin;

Systems of Intermediate Fissility(χ ≅ 0.5 - 0.6)

ER cross section comparable or larger than the fission cross section: more constraints on the SM;

larger charged particle multiplicity (almost an order of magnitude)

role of pre-saddle dynamics enhanced compared to saddle-to-scission-one

no much data on these systems

ER cross section comparable or larger than the fission cross section: more constraints on the SM;

larger charged particle multiplicity (almost an order of magnitude)

role of pre-saddle dynamics enhanced compared to saddle-to-scission-one

no much data on these systems

Heavy Fragment Correlations and Identification

Ring F-G Ring G-G

Δθ = 870-1230

GANES <θFF> = 1000Δθ = 680-1040

GANES <θFF> = 880

Deep Inelastic collisionsFission Events

Heavy Fragments

200 MeV 32S + 100Mo 132Ce

Light particles

1. Time-Of-Flight Spectrometer for fission fragments (CORSET, 2 arms + 2 arms)

2. New Annular PPAC for ER

Instrumental Upgrade

The CORSET set-up

Tof 2 position 2

Target 208Pb, 244Pu, Mtarget

Beam 48Ca 58Fe

Mproj, Vproj60°

60°

Tof 1 position 1Fragment 1

Fragment 2

θ1,2

E1,2 TKE

M1,2

8πLP-CORSET

1. 4 Start and Stop (4 arms, ring F and G)

2. NIM electronics for 2 arms

3. VME 32Ch TDC for 2 arms

L = 30/35 cm

Start

Stop

The Start-Stop assembling

YLF

XLF

SpLF

YLG

XLG

SpLG

StLF

StLG

StRG

StRF

SpRG

XRG

YRG

SpRF

XRF

YRF

beamtarget

Left ring G

Right ring G

Left ring F

Right ring F

beam

HVsupply

HVsupply

CFD

splitter

splitter

splitter

splitter

QDC

CFD

CFD

CFD

CFD

CFD

CFD

CFD

QDC

Scheme of coincidence

TAC

TAC

TAC

TAC

TAC

TAC

TAC

ADC

ADC

ADC

ADC

ADC

ADC

ADC

TOF1

TOF2

X1

Y1

X2

Y2

dT

Gate QDC

Gate ADC

Start

Y2X2

Sp2

St2

St1

Sp1

X1

Y1

Electronic modules1. HV supply - 4 channels2. QDC - 4 channels3. CFD - 8 channels4. TAC - 7 pieces5. ADC - 7 channels

8πLP-CORSET

CORSET Mass ResolutionΔΜAcn = 132 L = 35 Δt = 400ps

FWHM = 300ps

Fine presentazione

180 MeV 32S + 109Ag: TKE vs. Mass

TKE vs. Mass distributions for an intermediate system measured with a CORSET setup