1. 98 th session of the JINR Scientific Council
Nuclear Physics PAC
Dubna, June, 2005

2. Road map: general considerations
The PAC appreciates the initiative of the JINR Directorate to define a road map of strategic goals for the Institute’s research programme.
It is essential to include practical aspects of this programme, in particular financial and manpower resources in this road map. The vitality of the Institute’s activities demands a focusing of these resources, and this may involve some hard decisions concerning projects of lower scientific merit.
It is necessary that the impact of the various themes and projects should be highlighted, including the relevance to the interests of the wider international community in general and of the JINR Member States in particular.
In this context the provision, maintenance, operation and development of basic facilities is of course an essential element.
Dubna, June, 2005

3. Laboratory presentations
The laboratories presentations (BLTP, DLNP, FLNR, FLNP, LIT) reviewed traditionally their current activities and programmes for However it felt that in future presentations the strategic goals should be more clearly defined, in terms of the topical basic and applied physics questions to be addressed.
The PAC congratulates JINR physicists on their recent achievements and notes in particular the obtaining of a further two events in the Z=118 experiment at FLNR.
Dubna, June, 2005

4. Projects
Dubna, June, 2005

5. First experiments with 6He radioactive beams at DRIBs
The first experiments carried out at the DRIBs complex demonstrated a large potential for research with accelerated secondary beams. The presented results of the first experiments with 6He beams are of top quality. The investigation of the 6He break-up gave information on the momentum distributions of the 4He products at low energies. The fusion reaction with 6He showed first conclusive data on this process.
Dubna, June, 2005

6. RIB ACCELERATOR COMPLEX OF THE FLNR (JINR) - DRIBS-1
THE 7Li BEAM INTENSITY:
600 pnA
THE 6He BEAM PROFILE:
X = 7 mm; Y = 8 mm
THE 6He BEAM INTENSITY :
5.106 pps
Dubna, June, 2005

7. Measurement of the energy and momentum of the 6He-beam
using the magnetic spectrometer MSP-144
Dubna, June, 2005

8. MOMENTUM DISTRIBUTIONS - CONCLUSIONS
The narrow width of the momentum distribution of 4He from the breakup of 6He ( = 28±1 MeV/c) gives evidence for the existence of
a halo in 6He.
The comparison of the data obtained at 10 MeV/A with data at high energies ( MeV/A) shows that they are practically the same.
This means that low energy experiments can be as informative.
The width of the momentum distribution of 4He from the breakup of 6He only weakly depends on the target Z.
The width of the momentum distribution of 4He from the breakup of 6Li
( = 54±3 MeV/c) is evidence that there is an “intermediate” pn-halo in 6Li (Phys. Rev. C51 (1995) 2488; Phys. Lett. B527 (2002) 50).
Dubna, June, 2005

9. for measuring excitation functions of fusion reactions
EXPERIMENTAL SETUP
for measuring excitation functions of fusion reactions
Proportional gas chamber
Al-Absorber
197Au-foils
206Pb-foils
6He
14 MeV
60 MeV
6He+197Au  203Tl*
6He+206Pb  212Po*
6He+197Au  196,198,199Au
Dubna, June, 2005

10. Sub-barrier Fusion Enhancement : 6He+206Pb
5He+207Pb (Q=+5MeV)
4He+208Pb (Q=+13MeV)
Dubna, June, 2005
Zagrebaev. PRC 67 (2003)

11. CONCLUSIONS concerning fusion and transfer-reaction excitation functions
Enhancement is observed for above-barrier fusion (the 2n-channel for the 206Pb+6He reaction) compared to predictions of the statistical model.
Good agreement is observed with the predictions of the sequential fusion model for reactions of 6He+heavy nuclei (Zagrebaev, Phys. Rev. C67 (2003)).
Transfer reactions – the transfer of 2 neutrons from 6He to 197Au is about 3 orders of magnitude less than the transfer of 1 neutron.
Dubna, June, 2005

12. Recommendation. The research programme with 6He beams should be continued with first priority.
Dubna, June, 2005

13. MUON project
“Investigation of the Muon Properties and the Muon Interactions with Matter”
The PAC noted with interest the new results obtained in the MUON project during the last three years.
Dubna, June, 2005

14. 1. Status of the project Scientific collaboration with:
Paul Scherrer Institute(Switzerland)
Moscow Institute of Physics and Technology (MFTI, Dolgoprudny)
St.-Petersburg Institute of Nuclear Physics (Gatchina)
RNC "Kurchatov Institute" (Moscow)
Institute of theoretical and experimental physics (Moscow)
Max-Plank Institut fur Metallforschung(Germany)
Institute of Solid State and Semiconductor Physics of NASB, Minsk
Dubna, June, 2005

15. 2.1 Experiments with negative muons (Dr. T. Mamedov)
2. Resent results
2.1 Experiments with negative muons (Dr. T. Mamedov)
2.1.1 Semiconductors
2.1.2 g-factor of μ- in the bound state
2.1.3 Capture of μ- by the noble gases isotopes
Dubna, June, 2005

16. 2.2 Experiments with positive muons
2.2.1 Magnetism in Holmium
Dubna, June, 2005

17. 2.2 Experiments with positive muons
2.2.2 Heavy fermions Ce3Pd20Ge(Si)6
“… CePdSi compound is one of the heaviest-electron system with gamma reaching 8 J/ mol Ce K2 at 0.2 K …“
Dubna, June, 2005

18. 3. Status of the set-up
Dubna, June, 2005

19. 4. Plans and perspectives
We suppose:
4.1 - to continue experiments at PSI
(Si, SiC, diamonds, g-factor, …)
4.2 - to renew in Dubna the study of metals and oxides with big samples
( Bi2CuO4 Bi2O3 …)
4.3 - to start the study of ferroliquids (Rumania)
4.4 – to continue the activity with polarized targets
(Dr. E.I.Bunyatova)
Dubna, June, 2005

20. Recommendation. The PAC recommends continuation of this project.
Dubna, June, 2005

21. SAD project (written report)
The PAC welcomes the completion of the design stage of the project “Subcritical Assembly at Dubna” (project SAD), targeted on creating a facility for addressing important problems of modern nuclear energy production and waste transmutation.
Dubna, June, 2005

22. Dubna, June, 2005

23. Dubna, June, 2005

24. Dubna, June, 2005

25. Recommendation. The PAC encourages collaboration between the SAD project and running European and other transmutation projects aimed at establishing closer connection of JINR with the world scientific transmutation community and making it more attractive for Member States.
Dubna, June, 2005

26. New Projects
Dubna, June, 2005

27. PALM project
PALM project proposes a first experiment with positronium beams. In LEPTA the lifetime of the circulating electron beam was significantly increased, and reasonable parameters like UHV requirements for successful future operation were defined. The next step of LEPTA development will be construction of a positronium source, improvement of the vacuum and development of a positronium beam of adequate intensity for the proposed experiment.
The PALM experiment aims at an improved lifetime measurement of para-positronium by a factor of two compared with previous experiments. Although the PAC does not consider PALM to be a significant QED test, it welcomes this experiment as an important first educational step to train the young scientists who have made a major contribution in creating the LEPTA facility. The PAC expects, however, new physics proposals to be formulated in due time.
Dubna, June, 2005

28. Progress on LEPTA: Test of The Lepta Ring with Circulating Electron Beam
Electron gun
Dubna, June, 2005

29. Proposal of The Experiment PALM
(PArapositronium Lifetime Measurement)
Dubna, June, 2005

30. (para / para)theor = 210-6
Experiment PALM (continued)
LEPTA Ps
The proposed experiment is of a special interest due to two reasons:
1) The theory: QED calculations of para have been performed by several authors. The most advanced result
(para / para)theor = 210-6
was obtained by a single group (see [1] PRL 83 (1999) 1135) and have NOT been confirmed by any others.
Corrections of the para theoretical value have two originations. The first one relates to the relativistic modification of Bethe-Salpeter equation including correction of Coulomb potential. The effect on para value is expected to be of the order of (v/c)2 ~ 2 and 3 correspondingly (see Yad. Fiz. v.61, 1990). These effects are not investigated yet properly.
The second one is real radiation corrections including up to two-loop analysis. One can suspect that the contribution of the light-light scattering effect is underestimated in the paper [1].
(E. Kuraev, BLTP JINR, October 2005)
3.1. Motivation
Dubna, June, 2005

31. 3.2. Experiment scheme  One measures the function  130 mm   1 m
Experiment PALM (continued)
3.2. Experiment scheme
NbTi Fe
Superconducting
solenoid
Target
130 mm 
PMTube
BGO-crystal 
o-Ps
o-Ps/p-Ps
o-Ps Fe
NbTi
150 mm 
 1 m
One measures the function
N1(B) – number of detector counts during time interval T1 when solenoid field value is equal to B,
N2 – the count number during T2 at B = 0.
Dubna, June, 2005

32. Cycle duration – 100 s, where 10 s - transition (switching) time.
Experiment PALM: Statistics Requirements (continued)
Thus, to obtain the necessary statistic precision p / p = 1·10-4 one requires to register
Nexp  41010 events number.
Then the experiment duration is defined by the cycle parameters:
Cycle duration – 100 s, where
45 s – B-field is ON ,
45 s – B-field is OFF ,
10 s - transition (switching) time.
Besides, during every 45 s one half of time has to be spent for measurement of background (o-Ps is “closed”).
If the detector efficiency is  ~ 0.7 and average o-Ps flux intensity is of
I = 6103 s-1
the full duration of the experiment will be of
~ 9 months.
Dubna, June, 2005

33. Recommendation. Further development of the LEPTA ring and the PALM proposal as an educational experiment are recommended for approval.
Dubna, June, 2005

34. GERDA–MAJORANA project
The PAC recognizes the fundamental importance of modern neutrino experiments and the internationally acknowledged expertise of DLNP staff in this domain. With this in mind, the PAC welcomed the new proposal on the GERDA–MAJORANA project on the search for neutrinoless double-beta-decay of 76Ge. After the latest discoveries of the oscillations in reactor, solar and atmospheric neutrino fluxes, this new type of experiment is an essential next step in neutrino physics, and DLNP’s participation is deemed to be very important.
Dubna, June, 2005

35. G&M Experimental Search for Neutrinoless Double Beta Decay of 76Ge
(GERDA-MAJORANA)
Participants from Dubna:
V.Brudanin, M.V. Chirchenko I.Chirikov-Zorin, V.Egorov, K.Gusev, S.Katulina, A.Klimenko, O.Kochetov, I.Nemchenok, N.Rukhadze, V.Sandukovsky, A.Smolnikov, Yu.Shitov, V.Timkin, S.Vasiliev, Ts.Vylov, E.Yakushev, J.Yurkowski.
Dubna, June, 2005

36. Double beta bb(0n) decay : experimental observable
Dubna, June, 2005

37. The Majorana Zero-Neutrino Double-Beta Decay Experiment
GERDA Germanium Detector Array for the search of neutrinoless  - decays of 76Ge at LNGS
The Majorana Zero-Neutrino Double-Beta Decay Experiment
&
Dubna, June, 2005

38. Cost estimates & status of funding
Cap. Investment Phase I: kEuro
Phase II: kEuro
(~70% of funding secured)
Dubna, June, 2005

39. JINR contribution: Muon veto (plastic scint.) Radon detectors
Handling Ge detectors (we have a special group which can do it)
4 kg of 76Ge → SEGA (Majorana)
Data analysis, simulation, etc.
We’ll see…
Dubna, June, 2005

40. GERDA Collaboration Univ. Tübingen, Germany 1.8 + 1 4 6 + 2 3 6 + 1 4
INFN LNGS, Assergi, Italy
A.Di Vacri, M. Junker, M. Laubenstein, C. Tomei, L. Pandola
JINR Dubna, Russia
V. Brudanin, V. Egorov, K. Gusev, S. Katulina, A. Klimenko, O. Kochetov, I. Nemchenok, V. Sandukovsky, A. Smolnikov, J. Yurkowski, S. Vasiliev,
MPIK, Heidelberg, Germany
C. Bauer, O. Chkvorets, W. Hampel, G. Heusser, W. Hofmann, J. Kiko, K.T. Knöpfle, P. Peiffer, S. Schönert, J. Schreiner, B. Schwingenheuer, H. Simgen, G. Zuzel
Univ. Köln, Germany
J. Eberth, D. Weisshaar
Jagiellonian University, Krakow, Poland
M.Wojcik
Univ. di Milano Bicocca e INFN, Milano, Italy
E. Bellotti, C. Cattadori
INR, Moscow, Russia
I. Barabanov, L. Bezrukov, A. Gangapshev, V. Gurentsov, V. Kusminov, E. Yanovich
ITEP Physics, Moscow, Russia
V.P. Bolotsky, E. Demidova, I.V. Kirpichnikov, A.A. Vasenko, V.N. Kornoukhov
Kurchatov Institute, Moscow, Russia
A.M. Bakalyarov, S.T. Belyaev, M.V. Chirchenko, G.Y. Grigoriev, L.V. Inzhechik, V.I. Lebedev, A.V. Tikhomirov, S.V. Zhukov
MPP, München, Germany
I. Abt, M. Altmann, C. B\"uttner. A. Caldwell, R. Kotthaus, X. Liu, H.-G. Moser, R.H. Richter
Univ. di Padova e INFN, Padova, Italy
A. Bettini, E. Farnea, C. Rossi Alvarez, C.A. Ur
Univ. Tübingen, Germany
M. Bauer, H. Clement, J. Jochum, S. Scholl, K. Rottler 4
6 + 2 3
6 + 1 4
1.6
0.3
1.3
2+1
71 physicists listed; 30 full time equivalent staff + 5 PhD students
9.5 FET engineer/technician
Dubna, June, 2005

41. Dubna, June, 2005

42. Summary Collaboration formed: expertise
Aggressive Schedule: start construction summer 2005; first physics 2007
~70% of funding secured
Manpower sufficient to get project going: ~30 FTE staff physicist + 9 FTE engineer
Competitive with relevant physics results already in Phase I
Need approval to keep schedule
Dubna, June, 2005

43. Recommendation. The PAC considers the GERDA–MAJORANA project to be of the highest priority for DLNP and recommends its approval
Dubna, June, 2005

44. Development of the “Knowledge Base on Low-Energy Nuclear Physics”
The PAC welcomes the initiative of V. Zagrebayev’s team to create a network nuclear physics knowledge base. In particular, the provision of an on-line capability for performing nuclear reactions calculations is unique. The exercise is important to the wider international community and will bring great credit to FLNR. The PAC therefore urges the FLNR Directorate to assist in completing and continuously updating this base.
Dubna, June, 2005

45. Scientific reports
The PAC noted with interest the reports
on the resonance states of heavy hydrogen and helium nuclear systems, presented by G. Ter-Akopian, and appreciates the important new results in this field recently obtained at the ACCULINNA set-up.
"First results on fission, obtained at the n_TOF facility" presented by W. Furman. The impressive amount of top-quality nuclear data has been obtained by the collaboration CERN–JINR–IPPE (Obninsk). The PAC supports this activity and looks forward to the complete analysis of the measured data that will confirm their important practical and scientific input.
“Light nucleus clustering in fragmentation above 1 A·GeV” presented by P. Zarubin. Fragmentation of light nuclei has been observed at the Nuclotron beams using emulsion techniques. Inverse information on clustering features of nuclei is deduced.
Dubna, June, 2005

46. First Priority Experimental Tasks Scheduled for IREN with Budget and Manpower
Dubna, June, 2005

47. Members of the PAC for Nuclear Physics Independent members
Hans Börner * - ILL, Grenoble, France
Rafal Broda* - INP, Cracow, Poland
Jan Dobes - NPI, Řež, Czech Republic
Yury Gaponov - RRC «Kurchatov Iinstitute», Moscow,Russia
Andrei Goverdovski - IPPE, Obninsk, Russia
Natalia Janeva - INRNE, Sofia, Bulgaria
Gottfried Munzenberg - GSI, Darmstadt, Germany
Сlaude Petitjean - PSI, Villigen, Switzerland
Neil Rowley - IReS, Strasbourg, France
Adam Sobiczewski - INS, Warsaw, Poland
Ex officio members from JINR
Michail Itkis - Director, FLNR
Alojz Kovalik - Deputy Director, DLNP
Valery Shvetsov* - Deputy Director, FLNP
Victor Voronov - Deputy Director, BLTP
Tsvetan Vylov - Vice-Director, JINR
Pavel Zrelov - Deputy Director, LIT
__________________________
*are not present at this meeting
Dubna, June, 2005