1. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 1 Proposal to the n_TOF Collaboration at CERN on IFIN-HH joining Activities at the neutron time of flight facility at CERN – Second Phase (n_TOF-Ph2) http://pceet075.cern.ch/Documents/LoI_2005/n_TOF-Ph2_LoI.pdf n_TOF Collaboration Meeting 2006 Paris, Dec. 4-5, 2006 Vlad Avrigeanu, Mihai Mirea “Horia Hulubei” National Institute for Physics & Nuclear Engineering, Bucharest, Romania http://tandem.nipne.ro/~Dante/http://tandem.nipne.ro/~Dante/, http://fp6.cordis.lu/fp6/partnershttp://fp6.cordis.lu/fp6/partners  Activation reactions: (n,p), (n,  ), and (n,xc): V. Avrigeanu, M. Avrigeanu,R.A. Forrest (UKAEA-Culham) V. Avrigeanu, M. Avrigeanu, R.A. Forrest (UKAEA-Culham)  α-particle optical model / nuclear matter density (T): M. Avrigeanu, V. Avrigeanu, W. von Oertzen (HMI-Berlin)  Measurements of fission cross-sections and neutron interferometry: M. Petrascu, A. Isbasescu, H. Petrascu, I. Tanihata (TRIUMF), W.Y. Lynch M. Petrascu, A. Isbasescu, H. Petrascu, I. Tanihata (TRIUMF), W.Y. Lynch (MSU)  New information on the basic mechanism of nuclear fission: M. Mirea, L. Tassan-Got (IN2P3-Orsay) INTEREST IN FURTHER MEASUREMENTS

2. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 2 Neutron capture cross section measurements for nuclear astrophysics at n_TOF Michael Heil on behalf of the n_TOF collaboration Michael Heil NIC IX, June 2006, Geneva http://indico.cern.ch/getFile.py/access?contribId=270&sessionId=26&resId=1&materialId=slides&confId=059 Spark for this IFIN-HH proposal

3. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 3 Outlook - Plan for measurements in Phase-2 Michael Heil NIC IX, June 2006, Geneva Capture measurements Mo, Ru, Pd stable isotopes Fe, Ni, Zn, and Se (stable isotopes) 63 Ni, 79 Se A≈150 (isotopes varii) 147 Sm(n,  ), 67 Zn(n,  ), 99 Ru(n,  ), 58 Ni(n,p) r-process residuals calculation isotopic patterns in SiC grains s-process nucleosynthesis in massive stars accurate nuclear data needs for structural materials s-process branching points long-lived fission products p-process studies n_TOF will continue: Letter of Intent signed by 24 research labs of the n_TOF Collaboration + 4 newcomers (January 2005) Spark for this FIN-HH proposal

4. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 4 all stable 50,51 V isotopes (+ EC/JRC/IRMM-Geel) [Phys. Rev. C 65, 014604 (2001) ] all stable 58,60,61,62,64 Ni and 59 Co isotopes (+ EC/JRC/IRMM-Geel) [Nucl. Phys. A730, 255 (2004)] all stable 92,94,95,96,97,98,100 Mo isotopes (+ IRMM, KRI-St.Petersburg) [Nucl. Phys. A705, 265 (2002)] [Phys. Rev. C 71, 044617 (2005)] all stable 180,182,183,184,186 W isotopes (+ KRI, UKAEA, TUD-Dresden, [ Nucl. Phys. A765, 1 (2006) ] NRC-Petten, BNL-Brookhaven) all stable 174,176,177,178,179,180 Hf, 181 Ta isotopes (+ UKAEA, NRC, BNL) [PHYSOR-2006, …] all stable 55 Mn, 63,65 Cu isotopes (+ UKAEA, NRC, BNL)  Fast-neutron activation analysis (IFIN-HH, 2000-2006)

5. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 5 i.unitary use of common model parameters for different mechanisms ii.use of consistent sets of input parameters - determined by analyses of various independent experimental data iii.unitary account of whole body of related experimental data for isotope chains and neighboring elements [ activation & particle-emission spectra ] [ enlarged incident-energy range ] YES NO re-normalization or free parameters Outline of activation consistent model calculations [ E.D. Arthur – P.G. Young, LANL, ’80 ] [ IAEA/NDS RCs (12), Bucharest, 1982-2005 ] n_TOF-Ph2

6. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 6 e.g. : Isotopic effects in the (n,p) reaction cross section on Hf and W isotopes [ Isotopic effect on W isotopes: R. Caplar et al., Z. Phys. A 313, 227 (1983) ] Possible reason for actual model overestimation of 181 Ta(n.p) 181 Hf data: actual data: 181 Ta(n.p) 181g Hf unknown (long-life) isomer 181m Hf [Nucl. Phys. A765, 1 (2006)] [PHYSOR-2006, D.10.2]

7. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 7 Comparison of measured and calculated 181 Ta(p,xn) reaction cross sections PE threshold in CP-induced reactions  e.g., H.C.Chiang+, Nucl.Phys. A340,466(1980):  PE ~ (1 - V C / E)  [ b eff ~ b(1 - V C / E) 1/2 ] Interest of reaction cross-sections analysis within energy range E n <100 MeV: Discrepant Measured data ( if any! ) Calculated cross sections

8. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 8

9. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 9 BASIC QUESTIONS NUCLEAR-SURFACE EFFECTS ? – in particle-hole level densities [ PLD, CPCLibrary, Belfast, 1998]: – Phys. Rev. C 58, 295 (1998) – Comp. Phys. Comm. 112, 191 (1998) – in GDH model for pre-equilibrium emission [ STAPRE-H95, NEA-DB,1995]: – J. Phys. G: Nucl. Phys. 20, 613 (1994) – Phys. Rev. C 65, 014604 (2001) – J. Nucl. Sci. Tech. Suppl. 2, 803 (2002) NUCLEAR MOMENT OF INERTIA (I/I r ) ? – in nuclear level densities: [ e.g., S.F. Mughabghab, C. Dunford: Phys. Rev. Lett. 82, 4083 (1998 )] – J. Nucl. Sci. Tech. Suppl. 2, 746 (2002) – Nucl. Phys. A730, 255 (2004)  -PARTICLE OPTICAL MODEL POTENTIAL – low-energy  -particle emission : – Nucl. Phys. A723, 104 (2003) – Nucl. Phys. A764, 246 (2006) – Phys. Rev. C 73, 038801 (2006)

10. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 10 [ Cf: H. Weigmann et al., Nucl. Phys. A368,117(1981) ] [Phys. Rev. C 65, 014604 (2001)] The only data The only D 0 data useful within this method I/Ir=0.75: describe both neutron (RIPL) and proton D 0 data

11. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 11  OMPs describing  -emission: not suitable for ( ,  0 ) @ E  ~25 MeV ! ?

12. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 12 I BRUSLIB [www-astro.ulb.ac.be] I III OMPs from ( ,  0 ) (at E  <40 MeV): DO NOT DESCRIBE  -emission

13. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 13 Almost identical at r >R 7 (surface tail region):  DF (2003)  ROP (2003)  McFadden-Satchler (1966) V R (R 7 )=-7 MeV [Fernandez-Blair, Phys.Rev. C 1,523(1970)] Surface tail: V R <10 MeV [Igo, Phys.Rev.Lett. 1,72(1958)] Larger a R -values: AHA (1994) [E  <80 MeV]

14. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 14 Additional usefulness for consistent description of  -emission DF: ρ(r,T)= ρ 0 / [1+exp[(r-c)/a]] γ γ=1, for T=0 γ 0

15. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 15 High precision:uncertainties <3-4% (data basis average: ~15%) New opportunities also for model understanding New features of exp. data X 5X 5

16. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 16 2006 1994 2003 2006 International Symposium on Nuclear Astrophysics – Nuclei in the Cosmos–IX CERN, Geneva, 25-30 June, 2006 [ PoS (NIC-IX) ] Present work: ‘cold’ side

17. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 17 UDERSTANDING THE FISSION MECHANISM / INVESTIGATION OF THE INTERMEDIATESTRUCTURE IN THE RESONANCE REGION (1/2) EXPLANATION OF Th ANOMALY / DYNAMICAL SINGLE-PARTICLE EFFECTS / ANGULAR DISTRIBUTION OF FISSION FRAGMENTS ISOTOPIC DISTRIBUTION OF FISSION PRODUCTS / IMPROVEMENT OF EVALUATIONS  FISSION: Th anomaly (fine structure) PERFECT AGREEMENT Fission single-particle level scheme DYNAMICAL SINGLE-PARTICLE EFFECTS

18. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 18 UDERSTANDING THE FISSION MECHANISM / INVESTIGATION OF THE INTERMEDIATESTRUCTURE IN THE RESONANCE REGION (2/2) EXPLANATION OF Th ANOMALY / DYNAMICAL SINGLE-PARTICLE EFFECTS / ANGULAR DISTRIBUTION OF FISSION FRAGMENTS ISOTOPIC DISTRIBUTION OF FISSION PRODUCTS / IMPROVEMENT OF EVALUATIONS FISSION: 234U neutron induced cross section INTERMEDIATE RESONANCE STRUCTURE Minimal action trajectory in a multidimensional configuration space

19. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 19 Fig.1. Schematic representation of collision 11 Li + Si target Fig.2. Schematic representation of collision 11 Li + C target One can see from Fig.1 and Fig. 2 that there is a marked difference In the screening between the Si and the C targets. In Table I it is shown that the two neutron pre-emission probability P {2} calculated by sharp-cutoff is 0.492 for C target and 0.144 for Si tar-get, that is by about 3.5 times larger for C target than for Si target.

20. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 20 Fig. 1. This fig. is taken from ref. [1]. In the insert is shown the C nn correlation function for 11 Li calculated by using a 3-body model [1]. The minimum in the insert is due to the coherence bet-ween the 2 halo neutrons. In Table 3 it is shown that the new theory can be tested (Case 2) for a statistics of nn predicted in previous attached paper. [1] M.T.Yamashita et al., Phys. Rev. C72, 011601(R) (2005)

21. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 21 Correlation Functions

22. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 22

23. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 23  Activation reactions: (n,p), (n,  ), and (n,xc): V. Avrigeanu, M. Avrigeanu,R.A. Forrest (UKAEA-Culham) V. Avrigeanu, M. Avrigeanu, R.A. Forrest (UKAEA-Culham)  α-particle optical model / nuclear matter density (T): M. Avrigeanu, V. Avrigeanu, W. von Oertzen (HMI-Berlin)  Measurements of fission cross-sections and neutron interferometry: M. Petrascu, A. Isbasescu, H. Petrascu, I. Tanihata (TRIUMF), W.Y. Lynch M. Petrascu, A. Isbasescu, H. Petrascu, I. Tanihata (TRIUMF), W.Y. Lynch (MSU)  New information on the basic mechanism of nuclear fission: M. Mirea, L. Tassan-Got (IN2P3-Orsay) SUMMARY PROPOSAL BASIS / INTEREST IN FURTHER MEASUREMENTS

24. Vlad Avrigeanu / Mihai Mirean_TOF Collaboration Meeting 2006, Paris, 4-5 Dec. 24 Thank you - for kindest consideration & readiness to discuss our proposal - for invitation to attend n_TOF Meeting 2006 - for your attention !