Physics opportunities with an active target in Italy. T. Marchi, IKS-KU Leuven also on behalf of INFN - NUCLEX collaboration

Transcription

1 Physics opportunities with an active target in Italy T. Marchi, IKS-KU Leuven also on behalf of INFN - NUCLEX collaboration

2 Outline The SPES project at LNL status and timeline The MagicTin project o o o o Motivation The ideal setup In preparation for RiBs Timeline and deliverables Beyond MagicTin: physics opportunities with an active target at SPES

3 Operating facilities at LNL ALPI GARFIELD Tandem PIAVE Staff and users -> Accel and Beams PRISMA GALILEO

4 The SPES project at LNL Tandem-Piave-Alpi SPES GARFIELD Charge Breeder HRMS SPES ISOL source RFQ injector B70 cyclotron Cyclotron ISOL RIBs+ Post-Acc. PRISMA GALILEO Nuclear Medicine Nuclear Applications

5 SPES infrastructure Oct 2013 ACTAR TPC Kickoff meeting Few weeks ago

6 SPES core BEST B70 H MeV ma 2 exits Cyclotron installed at LNL Commissioning expected first semester 2016 SPES ISOL Target: UCx, SiC, fiss./s T ~ 2000 o C 3 sources SIS, LIS, PIS Beam test at ithemba lab. (2014): 66MeV protons, 60 µa on full scale SiC prototype at 1600 o C (FEM sim. Validation) Former beam tests: ORNL (2007, ) SiC, Ucx; ISOLDE(2009) UCx, IPNO (2013) UCx. Front End and Target System: advanced nuclearization phase. Target handling systems, Heat resistance tests, Nuclear Safety.

7 Reacceleration using ALPI E max [MeV/A] C 16 O 32 S 15 N At present With ALPI in SPES configuration Poli. (At present) 64 Zn 20 Ne 36 Ar 74 Ge 48 Ca 92 Zr 58 Ni 82 Se 132 Xe 84 Kr 120 Sn 93 Nb SPES configuration means: - (almost) complete renewal of the cryogenic plant. - Laser tracking beamline alignment - Added new cavities 90 Zr 197 Au 100 Mo A/q

8 SPES Project Phases and Timeline Exp. areas MRMS Phase First Operation with the cyclotron ALPI HRMS Phase 2a RNB ALPI Injector Target Phase 3b RFQ CB Phase 2b SPES Phase target, 2a. LRMS, Phase experimental 3a. 1+ Beam Lines LRMS Phase 3a From the LRMS to Beam the CB PIAVE cooler Phase 3b RFQ and ALPI XTU-Tandem 1+ Exp. areas Phase 2b. Phase 1. Cyclotron Phase First Operation with the cyclotron Phase 2a RNB ALPI Injector Phase 2b SPES target, LRMS, experimental 1+ Beam Lines Phase 3a From the LRMS to the CB Phase 3b RFQ and ALPI st semester: stable beams TANDEM nd semester: stable beams TANDEM-ALPI [G. Prete, SPES project TAC3 meeting 26/10/2015]

9 MagicTin

10 Shell evolution and collectivity in Tin isotopes MagicTin 100Sn 132Sn Z=50 closed proton shell crossing N=50 and N=82 neutron shells [

11 Shell evolution and collectivity in Tin isotopes MagicTin 132,134 Sn HRIBF 9000 ions/s 150 BaF 2 (~30% eff) [R.L. Varner et al, EPJA 25 (2005) 391] [V.M. Bader et al, PRC 88, (R) (2013)] 9 Be( 137 Sb, 136 RIKEN DALI2 (186 NaI(Tl)~22% eff) [He Wang et al, PTEP 023D02 (2014)]

12 f 7/2 vs p 3/2 neutron orbitals, in Sn like in Ca? MagicTin =50 [Adapted from O. Sorlin, M.-G. Porquet, Progr Part. Nucl Phys 61 (2008) 602] N=82 Fig.1 Analogy between f7/2 and p3/2 evolution of binding energies in the known Ca isotopes to what could be expected for the Sn isotopes approaching N=90. Figure adapted from 13.

13 Getting more details - transfer reactions MagicTin Probe single particle properties determining spectroscopic factors Extend towards more neutron-rich region (+1n) [K.L. Jones et al, Nature 465 (2010) 454] [J.M. Allmond et al, PRL 112, (2014)] Evidences of 132 Sn double magicity Resolution ~ 300 kev High resolution spectroscopy for 131 Sn 133 Sn using ( 9 Be, 8 Be) transfer reactions

14 Possible setup and beams Expected beam 10 AMeV SPES 1 st day (5 μa p beam) SPES full power (200 μa p beam) 132 Sn Sn Sn Sn Sn Stopped in gas: ~ 110 kev FWHM res ACTAR + Si wall 132 Sn(d,p) AMeV Gas-Si ( E-E): ~ 90 kev FWHM res 400 mbar D 2 [D..Perez-Loureiro and G.F.Grinyer, ACTARsim Report (2013)]

15 Improving resolution with gamma-ray detectors γ-rays in PARIS-like detectors from population of 854, 1363, 2005 kev states in 133 Sn Statistics corresponding to 2 days of beam time at 10 3 pps (total cross section 10 mb, photopeak eff 17%) Issue: might reduce global efficiency MeV Further steps (p,p ) [A. Corsi et al, PLB 743 (2015) 451]

16 Getting ready for RIBs: MT implementation MagicTin 120 Sn(d,p) 121 Sn - inv kinem 136 Xe(d,p) 137 Xe - inv kinem Open issues: - Tin isotopes at LNL, feasible but need some development. - Stable beam intensity reduction. (No Bacchus-like spectrometer available) - Which detector? - Which electronics?

17 Experimental area for an active target at SPES accelerated beams (stable or ribs) SPES RiBs

18 Request for an experimental area 8 m x 8 m Existing NUCLEX facilities: 1. Detector Laboratory 2. Acquisition ROOM 3. Private network 4. Standard analog and digital electronics Already required funding for: 1. Mechanical installation and support 2. Gas recirculation system [R.Raabe and G. F. Grinyer, two request letters to LNL director April 15th 2015]

19 A bit of R&D MagicTin TPC = 16k ch Option 1 Option 2 64 x ASAD = 4*AGET + ADC 256 ch 1 LVDS ASAD = 4*AGET + ADC 256 ch 1 Opt - link 8 x Avg 300 Mbit/s LVDS LVDS Opt-link TRANSLATOR 8 LVDS 1 Opt-link Avg 300 Mbit/s Opt-link 64 x Reduce costs Scalable Flexible Optical link 8 x Optical link PCI Express Gbit/s Processing node RAM CPU GPU Software trigger & Event Building storage Χ Needs new HW Χ Needs new SW Preliminary study

20 MagicTin timeline Deliverables D1.1 Technical report on the detector development D1.2 GPU feasibility study D2.1 d( 120 Sn,p) proposal submission D2.2 d( 134 Sn,p) proposal submission D3.1 Technical report on the detector installation D3.2 Technical report on the commissioning experiment D4.1 Submission of at least 1 scientific paper Milestones M2.1 Critical point decision. Depends on PAC and feasibility results

21 Beyond MagicTin: physics opportunities with an active target at SPES [F. Gramegna, ACTAR TPC Kickoff meeting 2013]

22 Beyond MagicTin: physics opportunities with an active target at SPES [ Two letters of intent for SPES endorsed by the SAC: B. Fernandez Dominguez et al, Direct Reactions with exotic nuclei in the r-process using an active target R. Raabe, T. Marchi et al, Shell Structure in the vicinity of 132 Sn with an active target

23