1. 10 August, 2010 Bradley M. Sherrill FRIB Chief Scientist
Pan-American Advanced Studies Institute on Rare Isotopes: Rare isotope production and FRIB
10 August, 2010
Bradley M. Sherrill
FRIB Chief Scientist

2. Broad Overview of Talk Production of rare isotopes
Goal: Try to talk about something not previously covered in detail at PASI
Production of rare isotopes
Reaction mechanisms
Facilities (FRIB)
Tests of fundamental symmetries
Effects of symmetry violations are amplified in certain nuclei
Societal applications and benefits
Bio-medicine, energy, material sciences, national security

3. How do we make rare isotopes?
Lithium-7
3 protons, 4 neutrons
Suppose we want to study Lithium-11
3 protons, 8 neutrons

4. An alternative 18O 17N 16C 15B 14Be 13Li 12Li 11Li 18O 11Li
Start with a nucleus with enough neutrons and to make 11Li (e.g. 18O) and remove protons
18O
17N
16C
15B
14Be
13Li
12Li
11Li
18O
11Li

5. Creation of new isotopes
18-Oxygen
Collision
11-Lithium
Atom smasher
To use this mechanism (projectile fragmentation), an 18O nucleus is accelerated to a velocity of greater than around 50 MeV/u.

6. Cross Section for Production
Beam
Target
18O
17N
16C
15B
14Be
13Li
12Li
11Li
One nucleon removal
Around 50 mb
(light nuclei)
P ≈ 5%
2n removal
5 mb
P = .5%
And so on
Rule of thumb
.1 x for each neutron removed rb rt
Actual: 16O +12C interaction cross section:
1000 mb (measured at 970 MeV/u)
Note: Above around 300 MeV/u the interaction length is shorter than the electronic stopping range of the 16O

7. Rare Isotope Production Mechanisms
There are a variety of nuclear reaction mechanisms used to add or remove nucleons (items for the jargon page)
Spallation
Fragmentation
Coulomb fission (photo fission)
Nuclear induced fission
Light ion transfer
Fusion-evaporation (cold, hot, incomplete, …)
Fusion-Fission
Deep Inelastic Transfer
Massive transfer
There is no best method. Many still have interesting physics question relevant to their application to produce rare isotopes.

8. Production Methods – Low Energy
(p,n) (p,nn) etc.
Ep < 50 MeV
Used for the production of medical isotopes.
Selective, large production cross sections (100 mb), and intense (500 mA) primary beams.
Used at HRIBF(ISOL), LLN (ISOL), ANL (in-flight) and Notre Dame (in-flight), Texas A&M (in-flight with MARS, e.g. 23Al)
Fusion-Evaporation
Low energy 5-15 MeV/A and “thin” targets (mg/cm2)
Selective with fairly large production cross sections.
Used at for example ANL(in-flight), JYFL (Jyväskylä)
Fusion-Fission – 238U+12C (basis of Laser acceleration idea D. Habs et al.)

9. Example of production by fusion-evaporation
Beam and target fuse (post fusion nucleons may be evaporated)
Variant – Incomplete fusion where particles are lost prior to the complete fusion of the participants
High, specific production cross sections
Example: 3He (58Ni, 60Zn) n, ENi = 250 MeV
Production cross section from PACE4 (A.Gavron, Phys.Rev. C21 (1980) ): 60 mb
1 g/cm2 target
Yield of 60Zn is 7x107/pμA (LBL 88-inch has 10 pμA of 58Ni)

10. Low Energy - Continued
Multi-Nucleon Transfer reactions (two body final state)
Significant cross section between MeV/A
High production of nuclei near stability.
Multi-nucleon reactions can be used to produce rare or more neutron rich nuclei, e.g. GSI mass separator had a program to study neutron rich f-p shell nuclei using neutron transfer.
Deeply inelastic reactions ( ?/A MeV/u range)
Deep inelastic - KE of the beam is deposited in the target. Products are emitted away from the beam axis.
Was used to first produce many of the light neutron rich nuclei
Is used to study neutron rich nuclei since the products are “cooler” and fewer neutrons are evaporated than in fusion reactions.
Large cross sections for production of some exotic isotopes

11. Deep Inelastic Transfer Example
R Broda J Phys G 32, R151-R192 (2006) – work at ANL, recent with GAMMASPHERE
I = 106/s
σ = 1 mb
20 mg/cm2
Yield = 700/hr
Models by Tasson-Got based on Monte Carlo (L. Tassan-Got and C. Stefan, Nucl. Phys. A524, 121 (1991)) and statistical decay of the product GEMINI (R. Charity et al., Nucl. Phys. A483, 371 (1988))

12. Production Mechanisms – High Energy
Fragmentation (FRIB, NSCL, GSI, RIKEN, GANIL)
Projectile fragmentation of high energy (>50 MeV/A) heavy ions
Target fragmentation of a target with high energy protons or light HIs. In the heavy ion reaction mechanism community this would include intermediate mass fragments.
Spallation (ISOLDE, TRIUMF-ISAC, EURISOL, SPES, …)
Name comes from spalling or cracking-off of target pieces.
One of the major ISOLDE mechanisms, e.g. 11Li made from spallation of Uranium.
Fission (HRIBF, ARIEL, ISAC, JYFL, …)
There is a variety of ways to induce fission (photons, protons, neutrons (thermal, low, high energy)
The fissioning nuclei can be the target (HRIBF, ISAC) or the beam (GSI, NSCL, RIKEN, FAIR, FRIB).
Coulomb Breakup (GSI)
At beam velocities of 1 GeV/n the equivalent photon flux as an ion passes a target is so high the GDR excitation cross section is many barns.

13. Spallation
From Wikimedia Commons:

14. Universality of Production Cross Sections
Na isotopes
H Ravn, CERN

15. Fragmentation (Projectile)
Pictorial model (above 50 MeV/u)
Parameterization of cross sections (EPAX 2 Sümmerer and Blank, Phys.Rev. C61(2000)034607)
Close related to Silverberg-Tso parameterization
Parameters fit to experimental data (exponential form function of removed nucleons)
Energy independent cross sections
Production cross section does not depend on the target
More detailed models (e.g. ABRABLA (K-H Schmidt et al. - See
Internuclear Cascade
projectile
target

16. Limiting Fragmentation
The production yield of residues saturates with a total beam energy of a few GeV. Limiting Fragmentaton
H. Ravn - “The saturation cross-section for more exotic species may well first be reached beyond 5 GeV.”
Kaufman and Steinberg, PRC 22 (80) 167.

17. Production cross section depends on mass
Cross section logarithmic with Qg (Tarasov PRC75)
Qg = ME(beam) – ME(fragment)
This provides a means to determine (roughly) the binding energy (M.B. Tsang et al., Phy Rev C DOI: /PhysRevC )
NOTE: The magnitude of the production cross sections do depend on the target
48Ca + W
140 MeV/u
48Ca + Be
140 MeV/u

18. Production Cross Sections Measured 76Ge Fragmentation at 130 MeV/u
Tarasov et al. Phys. Rev. Lett. 102, (2009)

19. Fission Pictorial Model
ABRABLA - See for excellent details (Schmidt et al.) – J. Benlluire et al. Phy. Rev. C (2008)
LISE++ Fission Models (Tarasov et al.) LISE++
The initial fragmentation step produces a wide range of excitation energies
Can use photons, protons, nuclei, etc. to induce the fission
Observation: For 500 MeV/u 238U the fragmentation and fission cross sections are approximately equal
projectile
target

20. Fission Cross Sections
Low energy fission can lead to higher yields for certain nuclides.
This is the basis of the electron driver upgrade of the TRIUMF (ARIEL).

21. Summary of High Energy Production Mechanisms
CHARMS http/

22. The availability of rare isotopes over time
Nuclear Chart in 1966
Available today
New territory to be explored with next-generation rare isotope facilities
The good old days
Less than 1000
known isotopes
blue – around 3000 known isotopes

23. Rare Isotope Production Techniques
Target spallation and fragmentation by light ions (ISOL – Isotope separation on line)
Photon or particle induced fission
In-flight Separation following nucleon transfer, fusion, projectile fragmentation/fission
Target/Ion Source
Post Acceleration
Accelerator
beam
Neutrons
Uranium Fission
target
Reactor
Electrons
Post Acceleration
Accelerator
Protons
beam
Fragment Separator
Beam
Gas catcher/ solid catcher + ion source
Beams used without stopping
Post Acceleration
Accelerator
Note how FRIB is unique in the world; in-flight separation and gas stopping with reacceleration.
target

24. Jargon
ISOL
In-flight (projectile fragmentation is one production mechanism)
Target/Ion Source
Post Acceleration
Accelerator
Accelerator
Beam
Fragment
Separator

25. Types of ISOL Ion Sources
Beam into page
Target
P. Butler

26. Production is only one part of the equation
I = s Ib Tuseable ediff edes eeff eis_eff eaccel_eff
H. Ravn
s - production cross section
Ib - beam intensity
Tuseable - usable target thickness
ediff – diffusion efficiency
edes – desorption efficiency
eeff – effusion efficiency
eis_eff - ionization efficiency
eaccel_eff - acceleration efficiency
target

27. In-Flight Production Example: NSCL’s CCF
D.J. Morrissey, B.M. Sherrill, Philos. Trans. R. Soc. Lond. Ser. A. Math. Phys. Eng. Sci. 356 (1998) 1985.
Example: 86Kr → 78Ni
K500
K1200
A1900
production
target
ion sources
coupling
line
stripping
foil
wedge
focal plane
p/p = 5%
transmission
of 65% of the
produced 78Ni
86Kr14+,
12 MeV/u
86Kr34+,
140 MeV/u
fragment yield after target
fragment yield after wedge
fragment yield at focal plane

28. Exotic Beams Produced at NSCL
More than 1000 RIBs have been made – more than 830 RIBs have been used in experiments
12 Hours for a primary beam change; 3 to 12 hours for a secondary beam

29. Advantages/Disadvantages of ISOL/In-Flight
GSI
RIKEN
NSCL
FRIB
GANIL
ANL
RIBBAS …
Provides beams with energy near that of the primary beam
For experiments that use high energy reaction mechanisms
Luminosity (intensity x target thickness) gain of 10,000
Individual ions can be identified
Efficient, Fast (100 ns), chemically independent separation
Production target is relatively simple
ISOL:
HRIBF
ISAC
SPIRAL
ISOLDE
SPES
EURIOSOL
Good Beam quality (π mm-mr vs. 30 π mm-mr transverse)
Small beam energy spread for fusion studies
Can use chemistry (or atomic physics) to limit the elements released
2-step targets provide a path to MW targets
High beam intensity leads to 100x gain in secondary ions
400kW protons at 1 GeV is 2.4x1015 protons/s

30. Sensitivity of Production of Rare Isotopes in Flight
The production cross sections for the most exotic nuclei are extremely small; but, facilities can have tremendous sensitivity. The projectile intensity at FRIB (48Ca 400 kW, ≅ 2x1014 ion/s) is such that production cross sections as low as 3x10-20 b (30 zeptobarns, 3x10-48 m2 ) are useful.
Neutrino elastic scattering cross sections are
Comparison super heavy elements are produced with .5 pb, 5x10-12 b (e.g. element 113 at RIKEN in cold fusion)

31. World view of rare isotope facilities
Ariel
Black – production in target
Magenta – in-flight production

32. Gordon Ball, TRIUMF

33. Present status of the Ariel Project
50 MeV, 500 kW superconducting e-linac funded
matching funding from BC province for buildings (funded June 2010)
second proton beamline deferred until next 5YP
Gordon Ball, TRIUMF

34. High Power Target Laboratory (HPTL)
HRIBF
25MV Tandem Electrostatic Accelerator
Injector for Radioactive Ion Species 1 (IRIS1)
Injector for Stable Ion Species (ISIS)
Oak Ridge Isochronous Cyclotron (ORIC)
Enge Spectrograph
Daresbury Recoil Separator (DRS)
High Power Target Laboratory (HPTL)
Recoil Mass Spectrometer (RMS)
On-Line Test Facility (OLTF)

35. Argonne National Laboratory: CARIBU & Energy Upgrade & HELIOS: Unique Synergy
Fission products of 252Cf spontaneous fission stopped in gas and accelerated
CARIBU gives access to exotic beams not available elsewhere.
Physics with beams from CARIBU (1 & 2 nucleon transfer reactions) needs the new energy regime opened by the Energy Upgrade (12 MeV/u) .
Solenoid Spectrometer greatly expands the effectiveness of both the fission fragment beams and the existing in-flight RIB program at these higher energies.
CARIBU upgrade
CARIBU
ATLAS Energy Upgrade
HELIOS
R. Janssens ANL

36. Yields from the ANL Upgrade
Guy Savard, ANL

37. Facility for Rare Isotope Beams, FRIB Broad Overview
Driver linac capable of E/A  200 MeV for all ions, Pbeam  400 kW
Early date for completion is 2018; TPC 613M$
Upgrade options (tunnel can house E/A = 400 MeV uranium driver linac, ISOL, multi-user capability …)
Thomas Glasmacher Project Manager
Konrad Gelbke Director

38. Overview of the FRIB Facility
Lowest cost configuration that meets technical requirements
Upgradable
Reviewed by various advisory committees
Endorsed by CD1 Lehman review July 2010

39. FRIB Cutaway View
Experimental areas and scientific instrumentation for fast, stopped and reaccelerated beams
Beam power ramps from 10 kW in year 1 to 400 kW in year 4

40. Details of the FRIB Layout
Β=0.04
β = 0.08
β = 0.2
β = 0.5
Superconducting RF cavities
4 types
≈ 344 total
Epeak ≈ 30 MV/m

41. Fragment Separator Details
Marc Hausman; Project leader
Unused isotopes could be collected at the beam dump and mass selection slits
Self-contained target building
Full remote-handling to maximize facility efficiency (target change/week)
Target applicable to light and heavy beams (about 1/3 of power lost in target)
Beam dump for unreacted primary beam for up to 400 kW beam power

42. The Five-Minute Rap Version
Rare Isotope Rap by Kate McAlpine (also did the LHC Rap)

43. LISE++ Simulation Code
The code operates under Windows and provides a highly user-friendly interface. It can be downloaded freely from the following internet address:
O. Tarasov, D. Bazin et al.

44. Fragmentation at 400MeV/u
LISE++ Simulation for 124Xe and 208Pb fragmentation
Momentum distrib.
100Sn
Relatively ‘easy’ to collect due to small phase space
200W
Angles ≤ ± 20 mrad
Momentum ± %
M. Hausmann, T. Nettleton

45. In-Flight Fission at 400 MeV/u
LISE++ Fission model for 238U pb pf
132Sn
76Ni
Angles ± mrad
Rigidity ± %
Plus correlations due to fission kinematics
M. Hausmann, T. Nettleton

46. Production Target and Beam Dump Area
Grouted floor over shield blocks
Target floor shielding
Beam dump floor shielding

47. Key FRIB component: Beam Stopping
Fast ions
He gas
G. Savard, ANL, D. Morrissey NSCL
LLN, GSI, et al.
Beams for precision experiments at very low-energies or at rest and for reacceleration
Cyclotron gas stopper
Linear gas stopper
Solid stopper (LLN (Belgium), KVI (Netherlands))

48. TPC covers schedule range
Preliminary Performance Baseline Schedule for 2018 Early Completion – CD-4 in 2020
CALENDAR YEAR
TPC covers schedule range

49. What New Nuclides Will FRIB Produce?
FRIB will produce more than 1000 NEW isotopes at useful rates (4500 available for study)
Theory is key to making the right measurements
Exciting prospects for study of nuclei along the drip line to mass 120 (compared to 24)
Production of most of the key nuclei for astrophysical modeling
Harvesting of unusual isotopes for a wide range of applications
Rates are available at

50. FRIB Organizational Structure and User Input into the Project

51. FRIB Users http://fribusers.org/
Potential users register as members of the independent FRIB Users Organization, FRIBUO
Chartered organization with an elected executive committee (Chair is Michael Smith, ORNL)
15 January 2010 began re-registration and by 27 July had 801 members (55 counties) ; we anticipate 1500 closer to CD4
The FRIBUO has 19 working groups on experimental equipment
Discussion of how to merge with NSCL Users Organization
Theory is represented by the FRIB Theory Organization
100 members
Wick Haxon LBL, Chair
Feb 2010 FRIB equipment workshop

52. Notional Equipment Layout for Fast, Stopped, and ReA3-ReA12
FRIB experimental areas will use existing NSCL augmented by a new ReA12 experimental area (funded by MSU, to be completed Sept 1, 2011)
ReA12 Upgrade is essential for much of the science of FRIB

53. ReA12 - Reaccelerator 12 MeV/u
ReA3 is under construction
ReA3 in operation by 2011
MeV/u for uranium
Upgrade to ReA12 by adding cryomodules already designed and previously constructed
MeV/u for uranium
Priority to fund outside the FRIB project

54. Equipment Needs for FRIB
ReA12 (reaccelerated beams to > 12 MeV/u) – consistent message from the scientific community on the importance of this (Users Brochure 2006, ANL and East Lansing FRIBUO Workshops)
GRETA (2007 NSAC LRP, top priority of nuclear structure community)
SECAR astrophysics recoil separator (top priority of astrophysics community, Feb 2010 FRIBUO Workshop)
Recoil mass separator is needed for > 5 MeV/u reaccelerated beams
Infrastructure needs: targets, computing, lab and office space (2010 FRIBUO Workshop

55. Tests of Nature’s Fundamental Symmetries
Angular correlations in β-decay and search for scalar currents
Mass scale for new particle comparable with LHC
6He and 18Ne at 1012/s
Electric Dipole Moments
225Ac, 223Rn, 229Pa (30,000 more sensitive than 199Hg; I > 1010/s)
Parity Non-Conservation in atoms
weak charge in the nucleus (francium isotopes; 109/s)
Unitarity of CKM matrix
Vud by super allowed Fermi decay
Probe the validity of nuclear corrections e γ
212Fr Z

56. Rare Isotopes For Society
Isotopes for medical research
Examples: 47Sc, 62Zn, 64Cu, 67Cu, 68Ge, 149Tb, 153Gd, 168Ho, 177Lu, 188Re, 211At, 212Bi, 213Bi, 223Ra (DOE Isotope Workshop)
-emitters 149Tb, 211At: potential treatment of metastatic cancer
Cancer therapy of hypoxic tumors based on 67Cu treatment/64Cu dosimetery
Reaction rates important for stockpile stewardship and nuclear power – related to astrophysics network calculations
Determination of extremely high neutron fluxes by activation analysis
Rare isotope samples for (n,g), (n,n’), (n,2n), (n,f) e.g. 88,89Zr
Same technique important for astrophysics
More difficult cases studied via surrogate reactions (d,p), (3He,a xn) …
Tracers for Geology (32Si), Condensed Matter (8Li), industrial tracers (7Be, 210Pb, 137Cs, etc.), …
Novel radioactive sources for homeland security applications (for example β-delayed neutron emitters to calibrate detectors, etc.)

57. Targeted Cancer Therapy
Modern targeted therapies in medicine take advantage of knowledge of the biology of cancer and the specific biomolecules that are important in causing or maintaining the abnormal proliferation of cells
These radionuclides have been relatively difficult to get in sufficient quantities1. The short-lived alpha emitters are particularly in demand, especially 225Ac, 213Bi, and 211At.
Pairs, e.g., 67Cu (treatment) and 64Cu (dosimetry) are particularly interesting
DOE Isotopes program and future research facilities, e.g., FRIB and HRIBF upgrade can parasitically supply demand for many isotopes
1Isotopes for the Nation’s Future: A Long Range Plan , NSACIS 2009

58. 8Li β-NMR Resonance Studies
Discovery potential of β-NMR very high in exploring depth dependent properties, interfaces, and proximity effects from 5 to 200 nm.
Sensitivity 1013 higher than NMR
Limited by availability of 8Li facilities
Example: Study of Mn12 single molecule magnets on Si Surface
NMR
Neutrons
µSR
ARPES
STM
LEµSR
βNMR
Z. Salman et al. Nano Lett. 7 (2007) 1551

59. Stockpile Stewardship Issues
Final yields of isotopes can be used as a diagnostic of the environment
Forensics
Stewardship and modeling
Similar issues occur in the astrophysical s-process
Report Opportunities with a Rare-Isotope Facility in the United States (2007) - Board on Physics and Astronomy (BPA)

60. Workforce in nuclear science
“This report draws attention to critical shortages in the U.S. nuclear workforce and to problems in maintaining relevant educational modalities and facilities for training new people. This workforce comprises nuclear engineers, nuclear chemists, radiochemists, health physicists, nuclear physicists, nuclear technicians, and those from related disciplines. As a group they play critical roles in the nation’s nuclear power industry, in its nuclear weapons complex, in its defense against nuclear and other forms of terrorism, and in several aspects of healthcare, industrial processing, and occupational health and safety.”

61. Summary
We have entered the age of designer atoms – new tool for science
FRIB (and other facilities) will allow production of a wide range of new designer isotopes
Necessary for the next steps in accurate modeling of atomic nuclei
Necessary for progress in astronomy (chemical history, mechanisms of stellar explosions)
Opportunities for the tests of fundamental symmetries
Important component of a future U.S. isotopes program
There are significant challenges remaining in modeling and understanding the best production mechanism

62. Homework We study isotopes with beams. Exotic Radioactive Unstable
Unusual
Rare