The AGATA campaign at GANIL Silvia M Lenzi

The AGATA campaign at GANIL Silvia M. Lenzi University of Padua and INFN Scientific Coordinator Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

AGATA Advanced GAmma Tracking Array The innovative use of detectors (pulse-shape analysis, g-ray tracking, digital DAQ) will result in high efficiency (~40%) and excellent energy resolution, making AGATA the ideal instrument for spectroscopic studies of weak channels. Construction in phases Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

AGATA Demonstrator/1π Experimental Program 2010 LNL 5 TC 2012 GSI/FRS 5 TC+5 DC 2014 GANIL/SPIRAL 2 ~15 TC AGATA D. +PRISMA AGATA @ FRS AGATA + VAMOS + EXOGAM Total Eff. ~6% Total Eff. > 10% Total Eff. > 20% Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

Beams and Efficiency Stable beams from C to U, from few Me. V/u to 95 Me. V/u and 24 Me. V/u, respectively, using the existing Cyclotron à Secteurs Séparés CSS 1 or CSS 1+CSS 2. Using a thick carbon target and the most intense stable beams from CSS 1+CSS 2, rare isotope beams (RIB) in the mass range below A=80 and intensities greater than 103 pps can be produced and post-accelerated at the SPIRAL 1 facility using CIME AGATA + EXOGAM 2 setup, at 233 mm from the target, the total photopeak efficiency is expected to be ~15% at 1. 3 Me. V (~ 8. 8 % from AGATA (1 ) and ~6 % from EXOGAM). Without the EXOGAM detectors, the 1 AGATA array (140 mm from the target) is expected to have ~18% photo-peak efficiency at 1. 3 Me. V. The recommended maximum counting rate per AGATA crystal is 50 k. Hz. Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

GANIL Uniqueness • • Energy range E/A from 0. 3 to 95 Me. V/A Heavy stable beams High intensity beams: ~ 2 pn. A 238 U, 1 pm. A 36 S, 0. 5 pm. A 36 S Intermediate energy fragmentation ISOL Spectrometers: SPEG and VAMOS γ-ray arrays (EXOGAM, Château de cristal) Several particle detectors: DIAMANT, MUST 2, TIARA, Nwall Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

Physics case for AGATA at GANIL ü Spectroscopy of heavy elements towards SHE ü Spectroscopy of very neutron-rich nuclei populated in deep-inelastic reactions ü Spectroscopy of N=Z nuclei ü Spectroscopy with reactions at intermediate energies ü Exotic nuclear shapes Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

First campaign in G 1 Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

AGATA coupled to VAMOS: Spectroscopy of n-rich nuclei Example: Beam of 238 U @ 5. 5 Me. V/u, ( ~ 2 pn. A) (N/Z=1. 58) Target : 48 Ca (1 mg/cm 2) (N/Z=1. 4) AGATA + VAMOS at the grazing angle Detection of target-like residues at the focal plane Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

AGATA coupled to VAMOS: Spectroscopy of n-rich nuclei VAMOS �VAMOS++ Larger acceptance due to the size of the detectors 129 Xe+197 Au Mass resolution ~ 1/220 Z identification up to Z= 60 at 967 Me. V Full reconstruction over the whole acceptance Opportunity for prompt spectroscopy of heavy elements populated in MNT Ni and Sn region M. Rejmund al, NIM A 646 (2011) 184– 191 Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

Spectroscopy beyond Fm: the shell model towards SHE Z=108 • Unique opportunity to couple AGATA -1π with a separator in fusion-induced reactions • Prompt spectroscopy with π, α tagging at the focal plane Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

Spectroscopy of neutron-deficient nuclei and exotic-particle decay • Breakdown of isospin symmetry: isospin nonconserving part of the nuclear interaction • E 1 amplitudes in mirror nuclei and isospinmixing • T=0 and T=1 np pairing • Proton emitters Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

AGATA coupled to Nwall+DIAMANT: Structure of neutron-deficient nuclei J=9 J=7 2536 (6+ ) 1786 (4+ ) 92 46 Pd J=7 46 A new Spin-aligned pairing phase in 92 Pd 874 (2+ ) 0+ 92 Pd, 0 exp. 10+ 4072 8+ 3127 6+ 2466 1708 4+ 2+ 878 0+ 92 Pd, 0 SM B Cederwall, et al, Nature 469, 68 -71 (2011) Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

Collectivity in N≈Z nuclei: Enhancement from T=0? VAMOS in gas-filled mode with AGATA and MUSETT (island of alpha emitters) Onset of collectivity induced by np pairing near N=Z and closed shells ? àPrompt spectroscopy of light Xe, Te, I isotopes à a and p emitter à AGATA : from spectroscopy to lifetime measurement (plunger) M. Sandzelius et al. , Phys. Rev. Lett. 99, 022501 (2007). Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

AGATA and complementary detectors Angles >10 ° for fission & MNT At 0° as separator (vacuum/gas-filled) In G 1 coupled to VAMOS (+ EXOGAM 2): SIBs, RIBs ü Charged particle array for transfer reaction MUST 2/TIARA : (d, p) etc … program with SIB and RIB ü Charged particle array for prompt tagging: DIAMANT ü Charged particle array for Recoil Decay Tagging: MUSETT ü Scintillator : Ba. F 2 array, La. Br 3 ü Future detectors : NEDA , GASPARD, PARIS ü Cryogenic target ? Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

AGATA Campaign at GANIL Campaign organization: Local Project Manager (E. Clément) Technical coordinator (L. Ménager) Scientific Coordinator (S. M. Lenzi) Call for L. o. I : deadline 25/01/2013 AGATA Week Workshop in February 2013 Goals: • Create the basis for defining the priorities for a detailed scientific program of the AGATA campaign at GANIL. • Identify campaigns using the same setup • Assess the technical feasibility, constrain the infrastructure and ancillary detectors integration, and estimate the cost of the campaign. • Identify any existing equipment to be upgraded. Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012

AGATA Campaign at GANIL • Conclusions and proposed physics campaigns will be presented at the 2013 GANIL Scientific Council. • 2013 PAC : proposal for experiments that will be scheduled in 2014 (1 st campaign) • 2014 PAC : proposal for experiments that will be scheduled in 2015 (2 nd campaign) • Early 2014 : AGATA installation in G 1 for the 1 st campaign • Commissioning during run 2 of 2014 • 6 months of campaign will be available in 2014 -2015 for AGATA@GANIL Silvia Lenzi – GHT Workshop 2012, October 29 -31, 2012