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Esperimento NUCL-EX

GARFIELD 8 p LP RIPEN. Esperimento NUCL-EX. Rappresentanti Nazionali: M. Bruno (BO) G. Casini (FI). Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric). 30 Ricercatori (25 FTE). Collaborazioni: Ganil, Jyvaskyla, Dubna, Nevsehir Univ. Turkey

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Esperimento NUCL-EX

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  1. GARFIELD 8pLP RIPEN Esperimento NUCL-EX Rappresentanti Nazionali: M. Bruno (BO) G. Casini (FI) Bologna (5 Ric), Firenze (9 Ric), LNL (6 Ric), Napoli (9 Ric), Padova (1 Ric) 30 Ricercatori (25 FTE) 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 Apparati Sperimentali @LNL FAZIA Dem.

  2. Evidenceof Strong deformation in alpha-like nuclei 24Mg+24Mg @92 MeV, (8pLP + PPAC modules) adetected in 8pLP, Residue detected in PPACs a-Residue angularcorrelation E F G BALL detector number a-Residues Angular correlation is better reproduced by assuming an Highly Deformed nucleus indicating a possible a-clustering stucture A. Di Nittoet al., EPJ Web ofConferences 21, 02002 (2012) CNR*11 Int. Conf., September 19-23, 2011 Prague, Czech Republic

  3. Experiments with n-rich/poor systems at low energy: 32S+40Ca, 48Ca, 48Ti 17.7MeV/A (N/Z=1., 1.22, 1.05) 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. Analysis in progress Sorting the events: • Peripheral collisions: many sources, • Central collision one source 32S+40Ca 17.7MeV/A 32S+48Ca 17.7MeV/A Level densities at low excitation energy are known to exhibit important isotopic and odd-even effects, resulting in staggering effects in different isotopic observables.

  4. Activities 2012-2013 2012/2013: 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) Ideasforproposals at TANDEM-ALPI: 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 model G. Adamian, Dubna Study of fusion-fission dynamics through fission fragment angular, Mass distributions and neutron multiplicity measurements S. Appannababu, LNL and Delhi

  5. RIPEN @ CN Van de Graafaccelerator 24 BC501 cylindricalLiquidScintillators 2 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 releaseofimpingingparticle • Timeof flight and PalseShapeDiscrimination • betweenneutron and g 8B production in the reaction6Li(3He,n)8B vianeutronangulardistributionmeasurement • Previous experiments using two different experimental techniques (Positron Counting technique and Neutron Time of Flight) give very different results for the 8B production crosssection varying by a factor of 3 8Bg.s. 12C(3He, n)14O 8B* Counts 6Li(3He,np)7Be C. Rubbia et al., NIM A 568 (2006) 475 g C.R.McClenahanet al., PRC 11 (1975) 370 R.E.Marrset al.,PRC 8 (1973) 427 P. Van DerMerweet al., NPA 103 (1967) 474 TOF (ns)

  6. RIPEN @ CN Van de Graafaccelerator V.L. Kravchuk et al., To be published in Phys Rev. Special Topic – Accelerators and Beams 6 MeV 3He+6Li  8B + n g.s. ds/dW (mb/Sr) 1st exc. Test experimentscheduledfromJuly 26 to August 3, 2012 in viewofanexperimentalcampaign at the CN Neutron emission angle in CM (deg) DefinitionofPhysics Cases forcoupling the neutrondetectorswith LCP detectors (modulesfrom 8PLP) and/or gamma detectors (GALILEO)

  7. FAZIA: PhaseII Medium-rangeplan 2012-2015 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 andCHIMERA@LNS Coupling FAZIA + INDRA Basic BLOCK: 4x4 telescopes WITH STABLE BEAMS & 1st DAY EXP with SPIRAL2 Transport properties of isospin asymmetric nuclear matter: neck emission and isospin drift 40,48Ca+40,48Ca at 15, 25, 35AMeV, 58Ni+58Ni at 30-45AMeV Related to deep-inelastic processes, isospin equilibration and drift; isoscaling for massive ejectiles 78,86Kr+40,48Ca ---> 20-60AMeV Related to the surface or volume expansion in central collisions

  8. 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

  9. SPARES

  10. GARFIELD Fragments and Light Particles identification • 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 Drift Chamber 14.5 MeV/A 32S+64Ni

  11. THE 8pLP SPECTROMETER

  12. The Experimental set-up: The TOF Apparatus 6 MeV 3He+6Li  8B + n 40 pnA, pulsed beam 333 ns rep. rate with 2 ns resolution DE (15 mm) – E (200 mm) Silicon Telescope pickup beam 1 2 3 4 8 3He 5 2 m Flight path DW ≈ 3 mSr Dq ≈ ±2o 7 6 1H 8 BC501 detectors covering angles from 15o to 140o in LAB 6LiF (500 mg/cm2) on Au (500 mg/cm2) Background measurements: 1)7LiF (500 mg/cm2) on Au (500 mg/cm2) 2)12C (70 mg/cm2) & 3) without target Rutherford scattering of the beam on the Au backing is used as normalization to determine the 8B production absolute cross section

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