Core Group for Prospective Study GANIL 2015 Core Group: Nicolas Alamanos, Giacomo de Angelis, Bertram Blank, Angela Bracco, Peter Butler, Fadi Ibrahim, Bill Lynch, Tohru Motobayashi, Gerda Neyens, Chistina Trautmann, Dominique Vernhet, Cristina Volpe, Ani Aprahamian, Muhsin Harakeh, Philippe Chomaz, Patricia Roussel Chomaz, Sydney Gales, and Marek Lewitowicz Cluster coodinators: Stéphane Grévy, Abdou Chbihi, Bruno Piquet, Riccardo Raabe, Gilles de France, Maurycy Rejmund, Jean-Charles Thomas, Navin Alahari, Emmanuel Balanzat Forward Look Forum (chaired by Bertram Blank) Technical Advisory Board (chaired by Frédéric Chautard) April 16 Core Group Paris June 10 Open Meeting Giens June 23 Core Group Paris August 29 Core Group Paris October 23-24 Open Meeting Caen Nov 21 Core Group Paris Dec 4 meeting on fragmentation beams Caen Jan 29 meeting on separator/spectrometer Caen Feb 16 Core Group + cluster cordinators Paris March 2 Core Group + SC + SP2-SAC Caen March 9 Open Meeting Caen 1

Prospects for GANIL 2015 GANIL presently offers unique opportunities in nuclear physics and many other fields: by providing low-energy stable beams, fragmentation beams and re-accelerated radioactive species; through the availability of a wide range of state- of-the-art spectrometers and instrumentation With the construction of SPIRAL2 over the next few years, GANIL is in a good position to retain its world-leading capability It faces strong competition from upgraded ISOL and fragmentation facilities

Underlying theme of report IN 2015 GANIL should prepare to be the world-leading ISOL facility Existing instrumentation – spectrometers, separators and detectors - should accommodate the intense neutron-rich beams from SPIRAL2 The repertoire of radionuclides from SPIRAL1 should also be enlarged In addition to LINAG, the present GANIL facility has a niche energy regime (~ 50 MeV/u) for intermediate energy physics 3

SPIRAL-1, SIRa I A large and interesting physics programme has been achieved using SPIRAL1 The main limitation of SPIRAL1 is the small number of elements available; insertion of new sources is difficult in the present configuration The modifications needed for the insertion of a charge breeder should be included in the safety file, with sufficient human resources in order to achieve this major improvement Laser ion sources at SPIRAL1 should be included in the file but their construction is second priority 4

SPIRAL-1, SIRa II Note from TAB report: “Second irradiation station is important for both SPIRAL1 and SPIRAL2 Could use existing target station D2 (SIRa and SPIRAL1 Cave)” 5

LIRAT Present limitations on permitted beams for LIRAT have to be overcome, particularly in the view of the use of SPIRAL1 for providing radioactive ions for DESIR. Authorisation for extracting all SPIRAL1 beams for LIRAT should be obtained. 6

Fragmentation studies: LISE and SISSI SISSI should not be replaced by an identical SISSI2: not internationally competitive in 2015 concentrate on SPIRAL2 A detailed study should be initiated that considers upgrading the LISE2000 beam line with a velocity filter and a magnetic spectrometer 7

Fragmentation studies: the future The community has enthusiastically endorsed the proposal for a new 100-150 MeV/nucleon post-accelerator that will allow fragmentation of neutron-rich fission products. This is outside of the scope of GANIL 2015 Nevertheless, GANIL should launch a preliminary, conceptual design study of a new post-accelerator that does not commit significant resources. This study should take advantage of related activity carried out within the EURISOL Design Study 8

Zero-degree studies I It is essential that there is provision of spectrometers/ separators for the study of reaction products, induced by SPIRAL2 beams, emitted at or close to the beam direction Detailed studies to allow the high intensity beams of SPIRAL2 into specifically identified caves have to be carried out, and for that purpose a working group should be nominated 9

Zero-degree studies II: LISE The velocity filter of LISE separator has been extensively used for fusion-evaporation reactions: implies a modification of the velocity filter - man-power intensive and not compatible with high beam intensities The detailed study that considers the enhancement of LISE for fragmentation studies should incorporate a parallel study for use for zero-degree operation with high-intensity RIB 10

Zero-degree studies III: SPEG The long-term usefulness of this instrument arises from its excellent performance and its versatility for different types of measurements In future SPEG will use beams from SPIRAL1, SPIRAL2 for measurements of inelastic and transfer reactions in inverse kinematics (and stable beams for material science) all the changes to the focal plane detector setup, required to perform reaction measurements with beams from SPIRAL1 and SPIRAL2 should be implemented 11

Zero-degree studies IV: VAMOS VAMOS has been successfully used for: (i) fusion reactions using stable or RIB beams (ii) transfer reactions in inverse kinematics using RIB (iii) multi-nucleon transfer using heavy stable beams VAMOS has to be ready for zero-degree operation (fusion evaporation and inverse-kinematics transfer) studies using intense SPIRAL2 beams Improvements to the existing Wien filter and a detailed study of a beam dump with a separate permanent beam-line are required Should accommodate large angle operation 12

EXOGAM High-resolution -ray spectroscopy with a Ge detector array is a very important part of the scientific programme of GANIL and SPIRAL2. The electronics should be renewed, funded by the international collaboration. As second priority the available number of Ge detectors should be increased. 13

INDRA/FAZIA The availability of a 4 detector with excellent isotopic and energy resolution enables sensitive studies of the isospin dependence of nuclear matter and its equation of state. It is important to complete the PHASE I - PHASE IV FAZIA implementation plans. These require the commitment of the international collaboration that will construct the device 14

INTERDISCIPLINARY / INDUSTRIAL GANIL provides energetic heavy ions and facilities for experiments in the fields of atomic physics, materials and condensed matter research as well as radio-biology and radio–chemistry. For material sciences: chopper relocation and intensity modulation For radiochemistry: reliable operation of pulse suppression For radiobiology: improving the beam stability For atomic physics: installing an analyzing magnet GANIL management is encouraged to keep allocating beam access to industrial users and to study the possibility of providing cocktail beams 15

Beams (Forum and SPIRAL2 LoI) PHYSICS Energy Intensity Beams Instrument Collective modes 50 MeV/u >10**6 38-50Ca, 56-70Ni, 96,98,100Zr LISE, EXOGAM, … Deformation properties 3-6 MeV/u RIB + stable EXOGAM, LISE, VAMOS, … SHE 5 MeV/u >10**10 90-94Kr, also stable Si, S, Ar, Ca LISE, VAMOS, EXOGAM, (S3) High Spin >10**9 92,94Kr, 132Sn, 140Xe, 152,154Nd EXOGAM, VAMOS,… Astrophysical reactions 1-3.5 MeV/u 74,76Kr, 108,110Sn, 120,122Xe, stable beams, neutron-rich 80-140, 170-200 LISE, EXOGAM Ground state, astrophysics low energy low intensity n-rich Be, n-rich close to N=50, N=82, close to p drip-line SIRa, LIRAT, (DESIR) Alpha clustering 10 - 40 MeV/u >10**4 36,40Ar or radioactive N=Z nuclei EXOGAM, VAMOS, SPEG, … Quasi-molecular 4 - 30 MeV/u >10**5 n-rich Be, C, O, Ne, Mg, Si LISE, … Neutron pairing 6-10 MeV/u 132,134,136Sn, 144Xe, 6He VAMOS, SPEG, … p-n pairing 4-130 MeV/u 48Cr, 56Ni, 72Kr, 80Zr LISE, VAMOS, SPEG, … Shell evolution > 8 MeV/u Neutron-rich C isotopes, 56Ni, 80Zn, 130Cd, 132Sn VAMOS, SPEG, EXOGAM, … Weakly-bound systems 5-20 MeVu 132, 134Sn, 134Te, 8Li, 14Be, 16-18C, 22-23O, 27-28Ne, 30Na, 32-34Mg, 40S, 46-48Ar, 84-86Se, 88-94Kr Fission, fusion < 5 MeV/u >10**8 10,15C, 14O, 132Sn, 238U, 64Ni, 16O VAMOS, EXOGAM, (S3) Nuclear thermodynamics 10-50 MeV/u > 10**6 106,112,120,132,136Sn, 56,64,74Ni, 78Zn, 94Kr, 96Sr, 72Kr, 114-145Xe, 122Cd, 90Kr,40,48Ca,58,64,74Ni VAMOS, INDRA, … Fundamental 8He, 18,19Ne, 34,35Ar,100Mo SIRa, EXOGAM, (DESIR),... 16

Next steps Final meeting of Core Group 23rd March Submission to Scientific Council and SPIRAL2 SAC Council meets in June 17