* Spokesperson: Isao Tanihata - Beijing and Osaka Co-spokesperson: Hans Geissel – GSI Chair of Collaboration board: Juha Äystö – Helsinki Co-chair: Christoph Scheidenberger

FAIR Experiments

Günther Rosner 2nd ECE Mtg., Darmstadt, 21/6/13 3

CBM

PANDA

APPANUSTAR

Scientific Program of the Super-FRS Collaboration

Report of the collaboration to the FAIR management

Darmstadt, May 26, 2014

• Take advantage of E>1500 A MeV 238U; cross section and kinematics.

• High-energy and high-intensity primary and secondary nuclear beams with energies up to 1,500 A MeV.

• Unique high-energy, high momentum-resolution multiple-stage spectrometer with large acceptance and flexible ion-optical settings, including the energy-buncher of the LEB.

• High primary-beam suppression power and high separation power of nuclides up to Z=92, and fully stripped ions of all elements.

• Versatile spectrometer modes by different combinations of separator sections, coupled to advanced tracking (GEM-TPC, diamond,Si,…)

Super-FRS scheme

Science Topics

Super-FRS for high mass and charge resolution (early stage)1. Rare isotope yields, ground state properties & limits of nuclei2. Understanding atomic collisions at relativistic energies

Super-FRS as high-energy and high-resolution spectrometer3. Spectroscopy of meson-nucleus bound system (mesonic atoms)4. Exotic hypernuclei and their properties5. Importance of tensor forces in nuclear structure6. Delta resonances probing nuclear structure (Benlliure, 2C)

Super-FRS as a multi-stage separator and spectrometer 7. Nuclear radii and momentum distributions8. In-flight radioactive decays and continuum spectroscopy by particle emission (Pfützner, 4A & Fomichev. PS1-139)9. Low-q experiments with an active target 10. Reaction studies and synthesis of isotopes with low-energy RIB

Search for new isotopes and the limits of bound nuclei produced in fission and fragmentation.

Take advantage of E>500A MeV 238U or other beams. Many new isotopes to be produced in fission, transfer and fragmentation.Part of commissioning phase (performance, ion optics, tracking,..)The determinations of production cross sections of unstable nuclei are imperative for entire Super-FRS operation.Stopped beam physics (CGC & MRTOF).

Key region for Super-FRS

J. Kurcewicz et al. Phys.Lett. B 717,371(2012)T. Kurtukian-Neito et al. Phys. Rev. C 89, 024616 (2014)

Exotic (n-rich) hypernuclei and their properties

Production of hypernuclei at high-energy (>1.2A GeV) heavy-ions peripheral collision is expected to have large cross sections.The method is also suitable for determination of lifetimes of hypernuclei via weak decay channel (Λfree p- or n0 , 0.26 ns)

(Lorentz factor on lifetime !)

Pilot experiment at FRS (HypHI) shows evidences of 3

ΛΗ, 4ΛΗ, 3Λn

C. Rappold et al Phys. Rev. C 88(2013)041001

A. Botvina et al Phys Rev C 88(2013)054605

The lifetimes have also been determined.

Higher mass resolution of Super-FRS will help for identifications.

Strangeness sector of nuclear chart

Delta resonances probing nuclear structure

Charge changing reactions with high-energy heavy ions provide unique possibilities to study baryon resonances, including Δ-resonances, in exotic nuclei (S=1, I=1 excitations).So far Δ-resonances in nuclei have been studied exclusively in stable or near stable nuclei

Δ(1232)112Sn(63Cu,X)112SbStudying

In-medium properties of baryon resonance in isospin asymmetric nuclear matter

Gamow-Teller transition strength

Radial distribution of neutrons and protons

Nuclear matrix elements for inelastic neutrino interactions

(Benlliure, session 2C)

Energy loss spectrum of 112Sb

Low-energy reaction studies with RiBs

Will be done at Low-Energy Beam line, employing the energy buncher.

Will challenge at and above Coulomb-barrier energies a new field for reaction studies.

Will contribute to a better understanding of deep inelastic, fusion-fission and complete fusion reactions.

Potentially serves for the extension of the nuclear chart to regions not accessible in fusion reactions with stable beams nor in fragmentation reactions.

Conclusions The scientific program presented is largely unique or

complementary within the NUSTAR collaboration.

It is unique in the world when compared with the goals of other next-generation exotic nuclear beam facilities.

It is in line with the scientific goals of FAIR and with the proposed scope of the Modularized Start Version.

The collaboration is open to, and exploits synergies with the scientific and technical programs of the other FAIR collaborations, in particular with APPA, CBM and PANDA.

List of topic conveners for Super-FRS Physics case

• Rare isotope search experiments (Pietri, Jokinen, Plaß et al.)

• Atomic collision experiments (Purushothaman, Geissel et al.)

• Mesonic atoms and in-medium effects (Itahashi, Weick et al.)

• Exotic hypernuclei and their properties (Saito, Nociforo et al.)

• Exploration of tensor force (Ong,Terashima, Toki, et al.)

• Delta resonances probing nuclear structure (Benlliure, Lenske et al.)

• Nuclear radii and momentum distributions (Kanungo, Prochazka et al.)

• Exotic radioactivity modes (Fomichev, Pfützner, Mukha et al.)

• Low-q experiments with Active Target (Egelhof, Kalantar et al.)

• Low energy reactions (Heinz, Winfield et al.)