Transcript Slide 1

98 th session of the JINR
Scientific Council
Nuclear Physics PAC
Dubna, June, 2005
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
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 Z=118
experiment at FLNR.
Dubna, June, 2005
Projects
Dubna, June, 2005
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
RIB ACCELERATOR COMPLEX OF THE FLNR (JINR) - DRIBS-1
decris-14
THE 7Li BEAM INTENSITY:
600 pnA
U-400M
ECR-4M
7
low energy beam line
U-400
Li
35 AMeV
Ве-target
catcher
Ion
source
6
He
RIB
10 AMeV
Counts
Measured by magnetic spectrometer MSP-144
7x10
3
6x10
3
5x10
3
4x10
3
3x10
3
2x10
3
1x10
3
THE 6He BEAM PROFILE:
X = 7 mm; Y = 8 mm
6
E ( He) = 60.3 MeV
FWHM =  0.4 MeV
6
INTENSITY = 5*10 pps
0
10
20
30
40
50
E (MeV)
60
THE 6He BEAM INTENSITY :
5.106 pps
70
80
Dubna,
June, 2005
Measurement of the energy and momentum of the 6He-beam
using the magnetic spectrometer MSP-144
6000
6
5000
8 1 0 ± 5 M e V /c
He
c o u n ts
4000
M S P -1 4 4
0
 =0
3000
2000
1000
0
0
100
200
300
400
600
700
800
900
1000
P (M e V /c )
5000
6
4000
c o u n ts
500
He
5 8 .2 ± 0 .6 M e V
3000
M S P -1 4 4
0
 =0
2000
1000
0
0
10
20
30
40
E (M e V )
Dubna, June, 2005
50
60
70
80
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 (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
( = 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
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+197Au
 196,198,199Au
Dubna, June, 2005
6He+206Pb
 212Po*
Sub-barrier Fusion Enhancement : 6He+206Pb
6He+206Pb
5He+207Pb (Q=+5MeV)
4He+208Pb
(Q=+13MeV)
100
, mb
80
60
40
20
10
Bc
15
20
exp
neutron trasfer
no neutron tranfer
25
30
Elab, MeV Dubna, June, 2005
Zagrebaev. PRC 67 (2003)
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
Recommendation. The research
programme with 6He beams should
be continued with first priority.
Dubna, June, 2005
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
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
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
2.2 Experiments with positive muons
2.2.1 Magnetism in Holmium
Dubna, June, 2005
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
3. Status of the set-up
Dubna, June, 2005
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
Recommendation. The PAC
recommends continuation of
this project.
Dubna, June, 2005
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
Dubna, June, 2005
Dubna, June, 2005
Dubna, June, 2005
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
New Projects
Dubna, June, 2005
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
Progress on LEPTA: Test of The Lepta Ring with Circulating Electron Beam
Electron gun
Dubna, June, 2005
Proposal of The Experiment PALM
(PArapositronium Lifetime Measurement)
Dubna, June, 2005
Experiment PALM (continued)
3.1. Motivation
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)
Dubna, June, 2005
Experiment PALM (continued)
3.2. Experiment scheme
Superconducting
solenoid

Fe
PMTube
BGO-crystal
NbTi
o-Ps
o-Ps/p-Ps
o-Ps

NbTi
130 mm
Fe
150 mm
Target
1m
One measures the function
g (B) 
N 1T 2
N 2T1
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
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
T exp 
100
45

N exp
 I
~ 99months
.
~
months.
Dubna, June, 2005
Recommendation. Further
development of the LEPTA ring
and the PALM proposal as an
educational experiment are
recommended for approval.
Dubna, June, 2005
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-betadecay 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
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
Double beta bb(0n) decay : experimental observable
Dubna, June, 2005
Majorana
The Majorana ZeroNeutrino Double-Beta
Decay Experiment
GERDA
&
Germanium Detector Array
for the search of
neutrinoless bb - decays
of 76Ge at LNGS
Dubna, June, 2005
Cost estimates & status of funding
Cap. Investment
Phase I:
Phase II:
6490 kEuro
3830 kEuro
(~70% of funding secured)
Dubna, June, 2005
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
GERDA Collaboration
INFN LNGS, Assergi, Italy
INR, Moscow, Russia
A.Di Vacri, M. Junker, M. Laubenstein, C. Tomei, L. Pandola
I. Barabanov, L. Bezrukov, A. Gangapshev, V. Gurentsov, V.
Kusminov, E. Yanovich
1.8 + 1
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
6+2
4
ITEP Physics, Moscow, Russia
V.P. Bolotsky, E. Demidova, I.V. Kirpichnikov, A.A. Vasenko,
V.N. Kornoukhov
Kurchatov Institute, Moscow, Russia
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
A.M. Bakalyarov, S.T. Belyaev, M.V. Chirchenko, G.Y. 3
Grigoriev, L.V. Inzhechik, V.I. Lebedev, A.V. Tikhomirov, S.V.
Zhukov
Univ. Köln, Germany
MPP, München, Germany
J. Eberth, D. Weisshaar
6+1
Jagiellonian University, Krakow, Poland
M.Wojcik
I. Abt, M. Altmann, C. B\"uttner. A. Caldwell, R. Kotthaus, X.
Liu, H.-G. Moser, R.H. Richter
4
Univ. di Padova e INFN, Padova, Italy
A. Bettini, E. Farnea, C. Rossi Alvarez, C.A. Ur
0.3 Italy
Univ. di Milano Bicocca e INFN, Milano,
E. Bellotti, C. Cattadori
1.6
Univ. Tübingen, Germany
M. Bauer, H. Clement, J. Jochum, S. Scholl, K. Rottler
1.3
71 physicists listed; 30 full
time equivalent staff + 5 PhD students
Dubna, June, 2005
9.5 FET engineer/technician
2+1
Dubna, June, 2005
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
Recommendation. The
PAC considers the
GERDA–MAJORANA
project to be of the
highest priority for
DLNP and recommends
its approval
Dubna, June, 2005
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
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
First Priority Experimental Tasks Scheduled for IREN with Budget and Manpower
A c tivity
(T a s k )
F L N P le a d e r
m anpow er
S e a rch fo r T R I vio la tio n
e ffe cts
V .S ko y
+ 1 0 p e o p le
~ 4 0 0 k$
R e q u e st fo r R F B R Ja p a n g ra n t
In ve stig a tio n o f P vio la tio n e ffe cts
L .P ike ln e r
+ 5 p e o p le
~ 1 5 0 k$
R F B R g ra n t
M e a su re m e n ts o f
n e u tro n m e a n -sq u a re
ch a rg e ra d iu s
N e u tro n p o la riza b ility
stu d ie s
S e a rch fo r p o ssib le
lo n g -ra n g e va n d e r
W a a ls in te ra ctio n
b e tw e e n n e u tro n a n d
n u cle u s.
V .N iko le n ko ,
G .S a m o sva t
+ 4 p e o p le
G .S a m o sva t
+ 5 p e o p le
~ 1 5 0 k$
R F B R g ra n t
Y u .P o ko tilo vs k y
+ 1 p e rso n
J IN R b u d g e t
P re s e n t o ff-b u d g e t
s u p p o rt
~ 1 5 0 k$
Ja p a n , K E K (Y .M a su d a )
K o re a , P o h a n g (G .K im )
M o sco w ,IT E P (A .B e d a )
M o sco w L e b e d e v in st. (A .S o ro kin )
P o la n d , L o d z, (J.A n d rze je w ski)
M o sco w , IT E P (G .L o b o v)
G a tch in a , P N P I (G .P e tro v)
T ro itsk, IN R (A .P e re kre ste n ko )
T ro itsk, IN R (A .P e re kre ste n ko )
~ 5 0 k$
N e u tro n -in d u ce d fissio n
stu d ie s
Y u .K o p a tch
W .F u rm a n
+ 7 p e o p le
~ 2 0 0 k$
N u cle a r stru ctu re
stu d ie s
A .S u kh o vo j
+ 3 p e o p le
~ 4 0 0 k$
N u cle a r d a ta fo r n u cle a r
p o w e r e n g in e e rin g , A D S
a n d tra n sm u ta tio n .
W .F u rm a n ,
Y u .G rig o rie v
+ 6 p e o p le
~ 2 0 0 k$
IS T C g ra n t
Y u .G le d e n o v
+ 7 p e o p le
~ 2 0 0 k$
R F B R g ra n t
N .G u n d o rin
+ 4 p e o p le
~ 1 0 0 k$
Dubna, June, 2005
N u cle a r d a ta fo r
a stro p h ysics; (n ,p ), (n ,? )
m e a su re m e n ts
N o n -d e stru ctive b u lk
e le m e n ta l a n a lysis b y
re so n a n ce n e u tro n s
C o lla b o ra tio n s
IN T A S g ra n t
G e rm a n y, D a rm sta d t (M .M u tte re r)
G a tch in a , P N P I (G .P e tro v)
JIN R F L N R (D .K a m a n in )
O b n in sk, IP P E (A .G o ve rd o vsky)
L a tvia , R ig a (v.B o n d a re n ko )
C ze ch R e p u b lic, P ra g u e (S .P o sp ish il)
C ze ch R e p u b lic, R ze z (J.H o n za tko )
S w itze rla n d , C E R N (A .M e n g o n i)
O b n in sk, IP P E (A .G o ve rd o vsky)
M o sco w , K I R A N (G .M u ra d ia n )
B u lg a ria , S o fia (N .Ja n e va )
G a tch in a , P N P I (V .V e sn a )
C h in a , P e kin g (G .Z h a n g )
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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, 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