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Bare nucleus astrophysical S(E) factors of the

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1 Bare nucleus astrophysical S(E) factors of the
NPAV, Eilat 4 – 8 April 2011 Bare nucleus astrophysical S(E) factors of the 2H(d,p)3H and 2H(d,n)3He reactions via the Trojan Horse method Aurora Tumino

2 Range of interest : 0-30 keV
2H+2H reactions in the primordial nucleosynthesis T≈109÷1011 K – 0.1÷10 MeV t ≈ 102÷103 s Range of interest: keV Other contexts of interest - In the Pre Main Sequence phase (PMS) of the stellar - In the future fusion power plants: nuclear energy production with inertial confinement Range of interest : 0-30 keV

3 Status of art of the 2H+2H reactions
Prominent data sets for both 2H(d,p)3H and 2H(d,n)3He Open problems: Missing data in the higher energy relevant BBN region: Ecm = 50 – 350 keV Electron screening in the ultra-low energy region below 10 keV: almost twice the adiabatic limit (14 eV) Laboratory electron screening different from that of stellar plasma Screening should be removed to assess the reaction rate correctly Need to get the bare nucleus S(E) factor C. Angulo and P. Descouvemont (NPA 639 (1998) 733)

4 Trojan Horse Method Quasi-free mechanism a S x c A C In PWIA
Basic principle: astrophysically relevant two-body  from quasi- free contribution of an appropriate three-body reaction A + a  c + C + s    A + x  c + C a: x  s clusters Quasi-free mechanism only x - A interaction s = spectator (Es~0) S c A a C Direct break-up x 2-body reaction EA > ECoul  NO Coulomb suppression NO electron screening In PWIA Eq.f. = EAx– Bx-s Eq.f.  0 !!! plays a key role in compensating for the beam energy C. Spitaleri et al., Phys. Rev. C 63, (2001) A.Tumino et al., Phys. Rev. Lett. 98, (2007) M. La Cognata et al. APJ (2010)

5 THM experiment 2H(d,p)3H 2H(d,n)3He using 3He as TH nucleus
d-d relative energy range: from 2 keV up to 1.5 MeV Aim: * Astrophysical factor throughout the relevant region and up, in order to have a wide energy range to be joint with available higher energy data (for the integral to converge at the relevant BBN temperature) This ensures an accurate calculation of the reaction rate *Available unscreened data below 10 keV, needed for studying fusion dynamics in plasmas

6 Experimental set up Nuclear Physics Institute of Academy of Science in Rez near Prague, Czech Republic 3He projectile CD2 target 1 2 3 10° 30° 3H/3He – p concidences (1-2 and 1-3) For the first time detection of the proton spectator! Advantages: no contribution from target break-up; dector granularity ensured  angular resolution of the order of 0.1°; 100% detection efficiency Not possible with neutron detectors Data analysis follows standard procedure: here only the final steps 2H(3He,n 3He)p 2H(d,n)3He 2H(3He,p 3H)p 2H(d,p)3H

7 Extraction of the two-body cross section (1)
R-matrix by C. Angulo and P. Descouvemont (NPA 639 (1998) 733) Inclusion of both l=0 and l=1 components in the cross section, whose energy dependence is very well represented by their penetrabilities Free parameters are scaling factors Cl and channel radius R: determined from the fit of the theoretical distributions to the measured coincidence yields Two coincidence yields per channel to be fitted at the same time

8 Coinc. yield at fixed Ec.m.
Extraction of the two-body cross section (2) Coinc. yield at fixed Ec.m. d/dc.m.= KF |(ps)|2 Solid lines: fit of direct data by

9 Extraction of the two-body cross section (3)
2H(3He,n 3He)p With the deduced scaling ratio of the s and p waves, S(E) factor after normalization to direct data Direct data have different accuracies  weighted normalization to available direct data from 15 keV to 1.5 MeV Incoherent sum of the two l contributions THM data l=1 l=0

10 Extraction of the two-body cross section (4)
Comparison between the incoherent sum black line) and direct data (colored symbols) Yellow line: polynomial expansion reported in the NACRE compilation Blue line: calculation from the Cyburt compilation Green line: calculation by P. Descouvemnont et al. 2H(3He,n 3He)p

11 Extraction of the two-body cross section (3)
2H(3He,p 3H)p Incoherent sum of the two l contributions

12 Extraction of the two-body cross section (4)
Additional weighted normalization to direct data below 15 keV after multiplying THM data by flab(E)=exp(Ue/E) (Assenbaum, H.J. et al., 1987, Z. Phys. A, 327, 461) with the screening potential Ue as free parameter: Ue = 8.6±0.4 eV In agreement with the adibatic limit Very good agreement with a recent theoretical determination by S. Kimura and A. Bonasera (PRL 93 (2004) ) and with R-matrix fit by Barker (NPA 707 (2002) 277) 2H(3He,p 3H)p

13 Present results from THM Present results from THM
Some numbers However none of the lines provide the correct slope of the THM data throughout the investigated region, with deviations ranging from few percents to 15%-20%. S(0) for 3He+n [keV b] S(0) [keV b] Ref. 60.1 1.9 Present results from THM 56 keV C. Angulo et al. (NACRE) 50.67 keV R.H. Cyburt 52.4 keV 3.5 P. Descouvemont et al. S(0) for 3H+p [keV b] S(0) [keV b] Ref. 57.4 1.8 Present results from THM 56 keV C. Angulo et al. (NACRE) 51.15 keV R.H. Cyburt 57.1 keV P. Descouvemont et al.

14 Conclusions 2H(3He ,n 3He)1H and 2H(3He ,p 3H)1H: first experiments where the spectator is detected S(E) factor extracted from 2 keV to 1.5 MeV, throughout the energy region of interest for pure and applied physics and up Estimate of screening potential only for the 3H+p channel because of the lack of direct data for the 3He+n channel in the ultra-low energy region. Ue = 8.6±0.4 eV in agreement with the adiabatic limit … next step: calculation of the reaction rate and investigation of fusion dynamics in plasmas Thank you!

15 The collaboration C. SPITALERI, S. CHERUBIN, M.GULINO, M. LA COGNATA, M.LAMIA, R.G.PIZZONE, S.M.R.PUGLIA, G.G. RAPISARDA, S.ROMANO, M.L.SERGI, S.TUDISCO, A.TUMINO I N F N, Laboratori Nazionali del Sud, Catania, Italy and Università di Catania, Italy A.MUKHAMEDZHANOV, R.TRIBBLE, L.TRACHE,V.GOLDBERG Ciclotron Institute, Texas A&M University, Usa C.ROLFS  Institut für Experimentalphysik III- Ruhr Universität Bochum, Germany S.TYPEL GSI-Germany S.KUBONO, T. MOTOBAYASHI CNS and RIKEN, Tokio,Japan A.COC, F. HAMMACHE CSNSM and IPN, Orsay,France IPN, Orsay, France V.BURJAN, V.KROHA, I. MRAZEK Nuclear Physics Institute, Academic of Science,Rez, Czech Rep. Z.ELEKES, Z.FULOP, G.GYURKY, G.KISS, E.SOMORJAI Inst. Of Nuclear Research ofAcademic of Science Debrecen,Ungaria G.ROGACHEV, E. JOHNSON FSU, USA N.CARLIN, M.GAMEIRO MUNHOZ, M.GIMENEZ DEL SANTO, R.LIGUORI NETO, M.DE MOURA, F.SOUZA, A.SUAIDE, E.SZANTO, A.SZANTO DE TOLEDO Dipartimento de Fisica Nucleare, Universidade de Sao Paulo,Brasil

16 Selection of the quasi-free mechanism
Comparison between the experimental momentum distribution and the theoretical one (for 3He given by the Eckart function) → QF mechanism 2H(3He,n 3He)p 2H(3He,p 3H)p

17 Deuterium and uncertainty of η
Uncertainty on η from deuterium: 50% observative 50% cross section uncertainty of reactions involving deuterium. [Smith et al., 1993]

18 Selection of the 3-body channels
E [Channels] 2H(3He,p3H)H E [MeV] 2H(3He,n3He)H E3H [MeV] Ep [MeV]

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