Esperimento NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30...

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Esperimento Esperimento NUCL-EX NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30 Ricercatori (25 FTE) Rappresentanti Nazionali: M. Bruno (BO) G. Rappresentanti Nazionali: M. Bruno (BO) G. Casini (FI) Casini (FI) Collaborazioni: Ganil, Jyvaskyla, Dubna, Nevsehir Univ. Turkey (BARC,TAMU, Moskow State Univ., Ohio State Univ.) ca e Termodinamica Nucleare zione e Decadimento di sistemi nucleari (Fusione – Fissione, equilibrio, Clustering) a dell’Isospin verso SPES (Densità dei Livelli, Energia di Si project GARFIELD 8 GARFIELD 8 LP RIPEN LP RIPEN Apparati Sperimental i @LNL FAZIA Dem FAZIA Dem . .

Transcript of Esperimento NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30...

Page 1: Esperimento NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30 Ricercatori (25 FTE) Rappresentanti Nazionali: M.

EsperimentoEsperimento NUCL-EX NUCL-EX

Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric)

30 Ricercatori (25 FTE)

Rappresentanti Nazionali: M. Bruno (BO) G. Rappresentanti Nazionali: M. Bruno (BO) G. Casini (FI)Casini (FI)

Collaborazioni: Ganil, Jyvaskyla, Dubna, Nevsehir Univ. Turkey(BARC,TAMU, Moskow State Univ., Ohio State Univ.)

• Dinamica e Termodinamica Nucleare• Formazione e Decadimento di sistemi nucleari (Fusione – Fissione, Pre-equilibrio, Clustering)• Fisica dell’Isospin verso SPES (Densità dei Livelli, Energia di Simmetria)• FAZIA project

GARFIELD 8GARFIELD 8LP RIPENLP RIPEN

Apparati Sperimental

i @LNL

FAZIA FAZIA DemDem..

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24Mg+24Mg @92 MeV, (8LP + PPAC modules)

Evidence of Strong deformation in alpha-like nuclei

detected in 8LP, Residue detected in PPACs

E F G

BALL detector number

-Residueangular correlation

-Residues Angular correlation is better reproduced by assuming an Highly Deformed nucleus indicating a possible -clustering stucture

A. Di Nitto et al., EPJ Web of Conferences 21, 02002 (2012) CNR*11 Int. Conf., September 19-23, 2011 Prague, Czech Republic

Page 3: Esperimento NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30 Ricercatori (25 FTE) Rappresentanti Nazionali: M.

32S+40Ca 17.7MeV/A 32S+48Ca 17.7MeV/A Sorting the events: •Peripheral collisions: many sources,•Central collision one source

GARFIELD + RING Counter: Central collisions: we expect that close to the multifragmentation threshold, the produced fragments will be relatively cold. The experimental reconstruction through correlation techniques of secondary decays in such moderately excited fragments will allow us to trace back the primary fragmentation pattern minimizing the model dependence of the procedure.

Level densities at low excitation energy are known to exhibit important isotopic and odd-even effects, resulting in staggering effects in different isotopic observables.

Analysis in progress

Page 4: Esperimento NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30 Ricercatori (25 FTE) Rappresentanti Nazionali: M.

Activities 2012-20132012/2013: Two experiments approved by the LNL PAC: 1. Study of a-clustering using pre-equilibrium emission (V.L. Kravchuk) 2. Probing the Statistical decay in N=Z light nuclei (G. Baiocco)

One approved experiment at TAMU: 1. Study of nuclear level density at moderate excitation energy (A. Voinov)

Jacobi and Poincare shapes of Ba isotopes vs. mass asymmetry of fission fragmentsA. Maj, Cracow

Role of the entrance channel in the production of complex fragments in fusion-fission and quasifission reactions in the framework of the dinuclear system modelG. Adamian, Dubna

Study of fusion-fission dynamics through fission fragment angular, Mass distributions and neutron multiplicity measurementsS. Appannababu, LNL and Delhi

Ideas for proposals at TANDEM-ALPI:

Page 5: Esperimento NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30 Ricercatori (25 FTE) Rappresentanti Nazionali: M.

RIPEN @ CN Van de Graaf accelerator 24 BC501 cylindrical Liquid

Scintillators2 V1720 digitizer from CAEN (12 bit, 250 MS/s) in the 8 channels VME version communicating with a standard PC via a VME bridge (CAEN V1718). • Energy release of impinging particle• Time of flight and Palse Shape Discrimination between neutron and

8B production in the reaction

6Li(3He,n)8B via neutron angular distribution measurement

Previous experiments using two different experimental techniques (Positron Counting technique and Neutron Time of Flight) give very different results for the 8B production cross section varying by a factor of 3 C. Rubbia et al., NIM A 568 (2006) 475C.R. McClenahan et al., PRC 11 (1975) 370 R.E. Marrs et al.,PRC 8 (1973) 427

P. Van Der Merwe et al., NPA 103 (1967) 474

12C(3He, n)14O

8Bg.s.

8B*

6Li(3He,np)7Be

TOF (ns)

Coun

ts

Page 6: Esperimento NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30 Ricercatori (25 FTE) Rappresentanti Nazionali: M.

0

2

4

6

8

10

12

0 50 100 150

RIPEN @ CN Van de Graaf accelerator

Neutron emission angle in CM (deg)

d/d

(m

b/Sr

)

V.L. Kravchuk et al., To be published in Phys Rev. Special Topic – Accelerators and

Beams

Test experiment scheduled from July 26 to August 3, 2012 in view of an experimental campaign at the CN

Definition of Physics Cases for coupling the neutron detectors with LCP detectors (modules from 8PLP) and/or gamma detectors (GALILEO)

6 MeV 3He+6Li 8B + n

1st exc.

g.s.

Total cross section Reference

(68 ± 7) mb (g.s.)(35 ± 7) mb (1st exc.) Experimental result

65 mb (g.s.)E3He=5.6 MeV (neutron TOF)

75 mb (g.s.) DWUCK4 calculation

(20 ± 3) mb Positron counting

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Transport properties of isospin asymmetric nuclear matter: neck emission and isospin drift

40,48Ca+40,48Ca at 15, 25, 35AMeV, 58Ni+58Ni at 30-45AMeVRelated to deep-inelastic processes, isospin equilibration and drift; isoscaling for massive ejectiles

78,86Kr+40,48Ca ---> 20-60AMeVRelated to the surface or volume expansion in central collisions

Coupling FAZIA + INDRAWITH STABLE BEAMS & 1st DAY EXP with SPIRAL2

FAZIA: Phase II

Basic BLOCK: 4x4 telescopes

The 192 telescopes of FAZIA demonstrator will be ready at the end of 2013.Initially they will be coupled with : INDRA Then with: GARFIELD@LNL, RIPEN@LNL and CHIMERA@LNS

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Richieste finanziarie per 2013

• Missione Interne

1 KE Riunioni collaborazione + 1 KE s.j turni LNS

• Missioni Estere

2 KE riunioni analisi Texas, riunioni Fazia, Assemblaggio

dimostratore Ganil

• Consumo

1 KE lavorazioni meccaniche, materiale test laboratorio

• Inventario

1 KE PC per analisi

Page 9: Esperimento NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30 Ricercatori (25 FTE) Rappresentanti Nazionali: M.

SPARES

Page 10: Esperimento NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30 Ricercatori (25 FTE) Rappresentanti Nazionali: M.

GARFIELD

• 2 Drift chambers : 180 micro-strip detectors + 180 CsI(Tl) ( = 300 – 1500)• Ring Counter: annular telescope, Ionization Chamber + Si + CsI(Tl) ( = 60 – 180)• Time of Flight system: 4 Position Sensitive Parallel Plate Avalanche Counters

Fragments and Light Particles identification

Drift Chamber

14.5 MeV/A 32S+64Ni

Page 11: Esperimento NUCL-EX Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30 Ricercatori (25 FTE) Rappresentanti Nazionali: M.

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THE 8LP SPECTROMETERTHE 8LP SPECTROMETER

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The Experimental set-up: The TOF Apparatus

8 BC501 detectors covering angles from 15o to 140o in LAB

pickupbeam

5

6 7

4

3

2

1

8

6 MeV 3He+6Li 8B + n40 pnA, pulsed beam 333 ns rep. rate with 2 ns resolution

2 m Flight path ≈ 3 mSr ≈ ±2o

Rutherford scattering of the beam on the Au backing is used as normalization to determine the 8B production absolute cross section

E (15 m) – E (200 m) Silicon Telescope

6LiF (500 g/cm2) on Au (500 g/cm2) Background measurements: 1)7LiF (500 g/cm2) on Au (500 g/cm2) 2)12C (70 g/cm2) & 3) without target

3He

1H