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PRISMA Ion Tracing Spectrometer for Nuclear Structure Studies: CLARA-PRISMA and AGATA-PRISMA Setups

This article discusses the PRISMA Ion Tracing Spectrometer coupled with large Ge arrays for nuclear structure studies. It explores the CLARA-PRISMA and AGATA-PRISMA setups, their components, and their applications in analyzing nuclear structure. The article also includes information on tracking techniques, Focal Plane Detectors, and Monte Carlo simulations of the PRISMA response function.

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PRISMA Ion Tracing Spectrometer for Nuclear Structure Studies: CLARA-PRISMA and AGATA-PRISMA Setups

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  1. The PRISMA Ion-Tracing Spectrometer coupled with Large Ge arrays for Nuclear Structure Studies: The CLARA-PRISMA and AGATA-PRISMA setups A.Gadea (IFIC, CSIC-University of Valencia)

  2. PRISMA Ion Tracing Spectrometer Q D A. Stefanini et al., NPA701 (02) 217c.

  3. MWPPAC 10 sect. X,Y & TF MCP Start Det. X,Y & TI 6m PRISMA: Large acceptance tracking Magnetic Spectrometer Q-D Designed for the HI-beams from XTU-ALPIW = 80 msr DZ/Z  1/60 (Measured) IC DA/A  1/190 (Measured) TOF Energy acceptance ±20% Max. Br = 1.2 T.m. Ionisation Chamber 10x4 sect. DE - E

  4. MCP Start Detector G.Montagnoli et al. NIM A547, 455 (05)

  5. Focal Plane Detectors: MWPPAC S.Beghini et al. NIM A551, 364 (05)

  6. The Focal Plane Detector: IC IC Maximum working pressure 100 hPa Z 10 x 4 sections 10x25 cm2 100 cm Electron Drift Velocity E.Fioretto et al.LNL Ann. Rep. 2002 p.148 S.Beghini et al. NIM A551, 364 (05) Courtesy of E. Fioretto INFN - LNL

  7. 195 MeV 36S + 208Pb, lab = 80o Y Z=28 Y position E (a.u.) X Z=16 IC E (a.u.) MWPPAC X position PRISMA detectors: present configuration ~ 600 mg/cm2 C foil 20 mg/cm2 thick Mylar foils 1.5 mm thick MCP Q Dipole CLARA E. Fioretto INFN - LNL Courtesy of E. Fioretto INFN - LNL

  8. New FPDs for low energy heavy-ions Secondary electron detector under production at University of Manchester ~ 420 mg/cm2 Heavy ions (E<10 MeVA; Z>10) Emissive foil (Vf = 10 kV) Mylar 0.6 mm + Al 30 nm ~ 80 mg/cm2 E Extraction Acceleration Accelerating grid (Vg = 0 V) B Thin window (0.9 mm) Guiding Focusing 0 V PPAC Y strips (Wires) MWPC Detection LPMWPC HV + X strips 0 V Dt ~ 150 ps DX, DY ~ 2 mm C4H10 – 5hPa Courtesy of E. Fioretto INFN - LNL

  9. Mylar foils 0.6 mm – 1.5 mm thick IC Se-D PRISMA detectors for light Ions and low energy heavy ions: SeD under development ~ 280 mg/cm2 C foil 20 mg/cm2 thick MCP Q Dipole Dipole CLARA Si Wall Plastic wall E. Fioretto INFN - LNL Courtesy of E. Fioretto INFN - LNL

  10. q IC Energy [a.u.] TRUE RECOIL VELOCITY+ TRAJECTORY IN DIPOLE+ TOTAL ENERGY rv [a.u.] Z IC Energy [a.u.] IC Range [a.u.] Tracking on PRISMA v/c BEAM LIKE true recoil velocity TARGET LIKE A/q trajectory in dipole MWPPAC DIPOLE IONIZATION CHAMBER 5‰ Energy resolution MCP Start Detector A MCP-MWPPAC DTOF=0.5 ns S.Beghini et al. NIM A551, 364 (05) G.Montagnoli et al. NIM A547, 455 (05)

  11. Monte Carlo Simulation of the PRISMA Response Function Monte Carlo simulation based on the ray tracing code originally developed by A. Latina and E. Farnea The charge states transported in the simulation have to be the same as in the experiment 48Ca Charge States Focal Plane detector MCP entrance detector D.Montanari et al. EPJA (11) in press Courtesy of D.Montanari INFN-Milano

  12. Response for an Uniform Distribution for 48Ca Transport in PRISMA of a uniform distribution in (Ek,q,f) EK = [200, 400] MeV J = [ 10°, 40°] j = [-40°,40°] Q = 19+ Q = 18+ Q = 16+ D.Montanari et al. EPJA (11) in press Courtesy of D.Montanari INFN-Milano

  13. GRAZING input GRAZING-Transp GRAZING-Transp * f(E,q) Calculated PRISMA Response with INPUT theoretical distributions (ds/dWdE)GRAZING (ds/dWdE)GRAZING-Transp * f(E,q) 47Ca 49Sc Ek q GRAZING model: (A.Winther, Nucl.Phys.A594 (1995)203) D.Montanari et al. EPJA (11) in press Courtesy of D.Montanari INFN-Milano

  14. CLARA-PRISMA at LNL Clover Detector arrayPRISMA Spectrometer A & Z identification “in-beam” g-ray 25 Euroball Clover detectors (GammaPool) Performance at Eg= 1.3MeV Efficiency ~ 3 % Peak/Total ~ 45 % FWHM < 10 keV (at v/c = 10 %) A. Gadea et al., EPJA20 (04) 193

  15. AGATA – PRISMAPRISMA: large acceptance spectrometer for binary reactions

  16. GRAZING and DIC REACTIONS QUASI-ELASTIC DEEP-INELASTIC J. Wilczynski, Phys. Lett. 47B(1973) 484 N/Z equilibration line QUASI-ELASTIC Production of Projectile-like and target-like nuclei. Production of n-rich nuclei. DEEP-INELASTIC Identification of products with complementary detectors or by g-spectroscopy of the partners is required

  17. 82Ge ~0.6mb 80Zn Approximate cross sections [mb] ~2mb Target Grazing reactions transferring several nucleons, a tool to study neutron-rich nuclei Beam Deep-inelastic reactions used since thick target pioneering work of R.Broda et al. (PLB 251 (90) 245) Use of Multinucleon-transfer at the grazing angle triggered by the LNL reaction mechanism group. 82Se + 238U 505 MeV Grazing calculations Effective Pairing Term Sequential Transfer L.Corradi et al., Phys.Rev.C59 (99)261, Theory: G.Pollarolo

  18. N=28-40 neutron-rich A~50-70 nuclei p3/2 p1/2 f5/2 g9/2 64Ni (400 MeV )+ 238U CLARA-PRISMA qG = 64o Doubly magic characterR.Broda et al., PRL 74 (95) 868 Magic Character of N=40 vanishes for Z<28.Evolution of the collectivity towards N=40 in the Fe (Z=26) isotopes DEFORMATION f7/2 First indication of N=32 shell gap in Cr isotopes J.I.Prisciandaro et al PLB510(01)17 Present in the in the 1f7/2 band in 55,57V S.Lunardi, S.M.Lenzi, S.Freeman

  19. Zn 30 70 29 Cu 28 Ni - 4p 27 Co 26 66 68 Fe 37 38 39 40 41 42 Beyond N=40 in Fe isotopes Comparison 64Ni and 70Zn onto 238U 64Ni+238U 70Zn+238U Ni 28 64 27 Co 26 - 2p +4n 66 Fe 25 Mn 24 60 62 Cr 34 35 36 37 38 39 40

  20. N=40 and N=42 Fe isotopes 70Zn@460MeV onto 238U N=42 N=40 The experimental level schemes are more quadrupole-collective than the calculated ones. Quadrupole collectivity can be produced by including the d5/2 shell in the model space (A. Zuker et al., PRC52 R1741 (1995)). S.M. Lenzi et al., LNL Annual Report 2007 and to be published

  21. Differential RDDS Measurement in the 48Ca region with CLARA D.Mengoni, J.Valiente, A.Gadea, A.Dewald Good Mass Resolution Differential Plunger for angles ≠ 0o 48Ca 310MeV + 1mg/cm2 208PbDegrader 4mg/cm2 Mg Eγ Eγ’ Doppler corrected

  22. Lifetime of the 2+ in 50Ca 48Ca Is Iu J.J. Valiente-Dobón et al. PRL 102 (09) 242502. The obtained effective charges (IS) are different to the ones obtained nearby N≈Z (IS+IV) → Possible isospin dependence of the effective charges. τ = 96 ± 3 ps

  23. 64Ni Inelastic Scattering T1/2 (4+) = 4.214 ps T1/2 (4+) = 4.713 ps T1/2 (4+) = 4.815 ps

  24. Differential RDDS Measurements at the AGATA – PRISMA setup with the Cologne Plunger Lifetimes: ~0.5 to ~500 ps at v/c ≈ 10% After Degrader Before Degrader Also at EXOGAM-VAMOS M-C simulation by D.Mengoni Cologne plunger setup for RDDS measurements in grazing reactions A.Dewald, Th. Pissulla, J. Jolie IKP-Uni. Köln

  25. SPECIFICATIONS OF ION TRACING SPECTROMETERS

  26. Summary and outlook: • PRISMA is a Ion Tracing Spectrometer for Heavy Ions with large acceptance (80 msr). • Coupled with Large Ge arrays it has been a very useful tool to study moderately neutron-rich nuclei produced by Grazing reactions • PRISMA can be use for any binary reaction with stable beams and RIBs. Any facility will benefit from such instrument • Drawback: complexity of the response function in case cross section measurements are performed

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