Nuclear Astrophysics
in NPI ASCR Rez, Czech Republic
Outline:
Hardware
Indirect methods
Experiments
Collaborations
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
U120M cyclotron
basic data
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Isochronous cyclotron
built in Dubna
First run in 1977
Number of upgrades
 Harmonic coils
 Monochromator
 Axial injection
 Negative ions
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
U120M cyclotron
parameters
Beams:
 p 10-25 MeV
 d 10-20 MeV
 3He 17-53 MeV
 alpha 20-40 MeV
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5uA (H- 40uA 38MeV)
5uA (d- 25uA)
2uA
5uA
Beams
radiopharmacy
N.A. experiments
neutron generator
activation experiments

meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
U120M cyclotron
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
U120M cyclotron
beamline
Monochromator magnet

Three experimental lines
Amos – achromatic magnetooptical
system system for zero-angle
measurements
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
U120M cyclotron
targets
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Solid isotopicaly enriched targets
 14C (225, 295, 400 ug/cm2)
 13C (395 ug/cm2)
meeting – Prague, June 2011
Gas target chamber
15N, 17O,18O, 20Ne gases
...
Jaromir Mrazek, NPI ASCR Rez
Nuclear astrophysics in NPI ASCR
indirect methods
Indirect methods
 ANC method
 Trojan Horse method
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
Nuclear astrophysics in NPI ASCR
ANC method

Indirect methods
 ANC method
Method of Asymptotic Normalization Coeficients was
developed and tested in cooperation with Texas A&M
University. The first test of ANC method performed
at NPI ASCR Rez using 16O(3He,d)17F
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Phys Rev C56 (1997) 1302
Phys Rev C59 (1999) 1149
Few-Body Syst.Suppl. (2000)102
Czech J.Phys 54 (2001)
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
ANC method
principle
direct radiative capture from
- transfer reaction
the radial overlap function and
DWBA cross section:
For peripheral reaction:
C is ANC
b is S.P.ANC
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
ANC method
While spectroscopic factors depend on the potential geometry
factors, ANC (from a peripheral transfer) depend at most weakly
on potential geometry.
Cross sections of astrophysical direct radiative capture reactions
(p, ) or (n, etc... are related to ( C )2
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
Astrophysical
experiments
ANC measurements at NPI ASCR Rez
•9Be + p 10B
• 12C + p 13N
• 13C + p 14N
• 14N + p 15O
• 16O + p 17F
• 15N + p  16O
• 14C + n  15C
• 18O + p  19F
•20Ne + p 21Na
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
Trojan Horse Method
priciples
Binary reaction via three-particle reaction
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beam energy
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detection angle
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good TH projectile
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quasifree condition
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complete kinematics
U120M's Trojan Horses 2H, 3He
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
Recent experiments in NPI ASCR
New astrophysical S factor for the 15N(p,gamma)16O
- CN cycle transform to CNO II, CNO III
- dominated by resonant capture to g.s. through two J=1- res.
S(0)=36.0 (6.0) keV b (LUNA: S(0)=39.6 - PRC82, 55804 (2010))
rate of leak from CN cycle - one in every 2200 (300) (previously 1200)
A.M.Mukhamedzhanov et al., Phys.Rev.C78, 015804 (2008)
A.M.Mukhamedzhanov et al.,Phys.Rev. C83, 044604 (2011)
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
Recent experiments in NPI ASCR
Trojan horse particle invariance studied with the 6Li(d,alpha)4He and 7Li(p,alpha)4He
- the PWA approach is valid
-THM is independent on a spectator particle
R.G.Pizzone et al., Phys.Rev.C83, 045801 (2011)
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
Recent experiments in NPI ASCR
Low-energy d+d fusion reactions via the Trojan Horse Method
A.Tumino et al., Phys.Lett.B 700 (2011)111
2H(d,p)3H
2H(d,n)3He
S(0)=57.4 (1.8) MeVb
S(0)=60.1 (1.9) MeVb
-Big Bang Nucleosynthesis
-Pre-Main Sequence stars
-future fusion reactors
Bare nucleus
reaction rates change by >15%
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
LEA NuAG
Associated laboratory – Nuclear Astrophysics and Grids

Four years project of virtual laboratory
 support the contacts between the parties and
benefit from synergies in common topics
 SPIRAL 2 construction and access
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
LEA NuAG
Associated laboratory – Nuclear Astrophysics and Grids
Hot burning cycles: an interesting isotope 14O

experiment : production in
3He(12C,n) on U120M
 14O(alpha,p)
experiment in
GANIL 2011/06

target station construction
for SPIRAL 2 (AFAC) - 14O
prod.
meeting – Prague, June 2011
A.Pichard et al., EPJA (2011) 47, 72
Jaromir Mrazek, NPI ASCR Rez
LEA NuAG
Associated laboratory – Nuclear Astrophysics and Grids
SPIRAL2 / NFS
 activation - excitation functions for IFMIF / ITER
 U120M E up to 20MeV, S2/NFS E up to 40MeV
d
d
 irradiation chamber + pneumatic system (+KIT)
 d-breakup contribution to the reactions (+INFN HH Bucharest)
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
Support
project of MŠMT(CR) – LH 11001
Asymptotic Normalization Coefficients and Trojan Horse Methods in
Nuclear Astrophysics.
by grant of GAČR P203/10/0310
Astrophysical Nuclear Reactions and Further Development of the
Indirect Methods
by Centrum of Nuclear astrophysics and Nuclear Physics (MED)
by ASCR -
Program of internal support of international projects
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez
Collaborators
NPI ASCR (CR) : P.Bém, V.Burjan, Z.Hons, V.Kroha, M.Majerle,
J.Mrázek, J.Novák, Š.Piskoř, E.Šimečková
TAMU (USA) : C.A.Gagliardi, A.M.Mukhamedzhanov, A.Sattarov,
X.Tang, L.Trache, R.E.Tribble
INFN-LNS (Italy) : M.LaCognata, L.Lamia, R.G.Pizzone, S.Romano,
C.Spitaleri, S.Tudisco, A.Tumino, S.Cherubini, M.L.Sergi
INF Debrecen (Hungary):Z.Fülop,E.Somorjai,G.Kiss
GANIL (France) F.d.Oliviera-Santos, M.Lewitowicz, M.G.Saint-Laurent,
G.Lhersonneau
meeting – Prague, June 2011
Jaromir Mrazek, NPI ASCR Rez