98 th session of the JINR Scientific Council

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98 th session of the JINR Scientific Council

• Nuclear Physics PAC

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Road map general considerations

• The PAC appreciates the initiative of the JINR
  Directorate to define a road map of strategic
  goals for the Institutes 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 Institutes 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.

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Laboratory presentations

• The laboratories presentations (BLTP, DLNP,
  FLNR, FLNP, LIT) reviewed traditionally their
  current activities and programmes for 2006.
  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 Z118
experiment at FLNR.
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Projects
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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.

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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
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Measurement of the energy and momentum of the
6He-beam using the magnetic spectrometer MSP-144
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MOMENTUM DISTRIBUTIONS - CONCLUSIONS

• The narrow width of the momentum distribution of
  4He from the breakup of 6He (? 281 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 (50-100 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
• (? 543 MeV/c) is evidence that there is an
  intermediate pn-halo in 6Li (Phys. Rev. C51
  (1995) 2488 Phys. Lett. B527 (2002) 50).

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EXPERIMENTAL SETUP for measuring excitation
functions of fusion reactions
Proportional gas chamber
Al-Absorber
197Au-foils
206Pb-foils
6He
14 MeV
60 MeV
6He206Pb ? 212Po
6He197Au ? 203Tl
6He197Au ? 196,198,199Au
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Sub-barrier Fusion Enhancement 6He206Pb
6He206Pb
5He207Pb (Q5MeV)
4He208Pb (Q13MeV)
Zagrebaev. PRC 67 (2003)
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CONCLUSIONSconcerning fusion and
transfer-reaction excitation functions

• Enhancement is observed for above-barrier fusion
  (the 2n-channel for the 206Pb6He reaction)
  compared to predictions of the statistical model.
• Good agreement is observed with the predictions
  of the sequential fusion model for reactions of
  6Heheavy 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.

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Recommendation. The research programme with 6He
beams should be continued with first priority.
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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.

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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

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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

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2.2 Experiments with positive muons

• 2.2.1 Magnetism in Holmium

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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

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3. Status of the set-up
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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)

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Recommendation. The PAC recommends continuation
of this project.
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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.

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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.
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New Projects
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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.

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Progress on LEPTA Test of The Lepta Ring with
Circulating Electron Beam
Electron gun
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Proposal of The Experiment PALM
(PArapositronium Lifetime Measurement)
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Experiment PALM (continued)
3.2. Experiment scheme
?
o-Ps/p-Ps
o-Ps
o-Ps
?
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Experiment PALM Statistics Requirements
(continued)
Thus, to obtain the necessary statistic
precision ??p / ?p 110-4 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
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Recommendation. Further development of the LEPTA
ring and the PALM proposal as an educational
experiment are recommended for approval.
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GERDAMAJORANA 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 GERDAMAJORANA
  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 DLNPs participation is deemed to be
  very important.

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GM 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.
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Double beta bb(0n) decay experimental
observable
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GERDAGermanium Detector Array for the search of
neutrinoless ?? - decays of 76Ge at LNGS
Majorana
The Majorana Zero-Neutrino Double-Beta Decay
Experiment

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Cost estimates status of funding
Cap. Investment Phase I 6490 kEuro Phase
II 3830 kEuro
(70 of funding secured)
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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.
• Well see

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GERDA Collaboration
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
1.8 1
4
6 2
3
6 1
4
1.6
0.3
1.3
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71 physicists listed 30 full time equivalent
staff 5 PhD students 9.5 FET engineer/technician

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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

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Recommendation. The PAC considers the
GERDAMAJORANA project to be of the highest
priority for DLNP and recommends its approval
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Development of the Knowledge Base on Low-Energy
Nuclear Physics

• The PAC welcomes the initiative of
  V. Zagrebayevs 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.

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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 CERNJINRIPPE
  (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 AGeV 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.

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First Priority Experimental Tasks Scheduled for
IREN with Budget and Manpower
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• Members of the PAC for Nuclear Physics
• Independent members
• Hans Börner - ILL, Grenoble, France
• Rafal Broda - INP, Cracow, Poland
• Jan Dobes - NPI, Rež, Czech Republic
• Yury Gaponov - RRC Kurchatov Iinstitute,
  Moscow,Russia
• Andrei Goverdovski - IPPE, Obninsk, Russia
• Natalia Janeva - INRNE, Sofia, Bulgaria
• Gottfried Munzenberg - GSI, Darmstadt, Germany
• ?laude 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