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The new intermediate energy in - flight facility ACCULINNA-2. ACCULINNA -2 collaboration

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slide1

The new intermediate energy in-flight facility

ACCULINNA-2

ACCULINNA-2 collaboration

A.S. Fomicheva, G.M. Ter-Akopiana, V. Chudobaa, A.V. Daniela, M.S. Golovkova, V.A. Gorshkova, L.V. Grigorenkoa, G. Kaminskia,b, S.A. Krupkoa, Yu.Ts. Oganessiana, S.I. Sidorchuka, R.S. Slepneva, S.V. Stepantsova, S.N. Ershova, V.K. Lukyanova, B.V. Danilinc, A.A. Korsheninnikovc, V.Z. Goldbergd, M. Pfütznere, I.G. Mukhaf, H. Simonf,

V.A. Shchepunovg , O.B. Tarasovh, N.K. Timofeyuki, M.V. Zhukovj

  • RIBs projects at FLNR
  • ACCULINNA separator
  • Details of a new RIB facility ACCULINNA-2

aJoint Institute for Nuclear Research, Dubna, Russia

bInstitute of Nuclear Physics PAN, Krakow, Poland

cRRC The Kurchatov Institute, Moscow, Russia

dCyclotron Institute, Texas A&M University, College Station, USA

eInstitute of Experimental Physics, Warsaw University, Warsaw, Poland

fGesellschaft für Schwerionenforschung mbH, Darmstadt, Germany

gUNIRIB, Oak Ridge Associated Universities, Oak Ridge, USA

hNSCL, Michigan State University, East Lansing, Michigan, USA

iDepartment of Physics, University of Surrey, Guildford, UK

jFundamental Physics, Chalmers University of Technology, Göteborg, Sweden

slide2

RIBs: now

6He@10 AMeV

Low energy

beam line

Production target and ECR source

DIRECT

Combas

Acculinna

DIRECT

400-cm cyclotron

and injection line

ISOL

Electron accelerator

Photo-fission induced RIBs (Project)

Dubna

Radioactive

Ion

Beams

DRIBs-I

400-cm cyclotron

stable ion beams: now 7Li@34 AMeV

→ DRIBs-III

2010-2016

slide3

Existingexperimental facilities

Planedexperimental facilities

Acculinna−2

Acculinna

Combas

MASHA

DubnaRadioactive IonBeamsIII (DRIBs III)

slide4

main parameters

small angular acceptance

Limited space in the final focus plane and, finally,

purification of proton-rich secondary beams is not so good.

ToF base is short enough - 8.5 m

the size of a beam spot at F4 is two times

more than it’s at F3 because of optic asymmetry

x2

ACCULINNA separator

U−400M cyclotron:

7Li,11B,18O @ 33 AMeV

20Ne, 32S @ 50 AMeV

“Scientific facilities, which are not upgraded

after 10 years of functioning become rotten…”

H. Simon@gsi.de

* 1996 – first experiment

** 2000 – last upgrade

*** 2010 – next step Acc.2

slide5

Main results since 2000

4H – Ground state resonance parameters are ER=3.05 MeV, G =4.18MeV

5H – ER = 1.8 MeV, G = 1.3 MeV; continuum above 2.5 MeV as

a mixture of energy degenerated broad 3/2+ and 5/2+ states;

interference of 3/2+− 5/2+ doublet and 1/2+ g.s.

7H –No peak of 7H near t + 4n threshold was observed, however

the excitation spectrum shows the peculiarity at ~2 MeV

6He – Experimental verification of “di-neutron” configuration;

t + t clustering revealed; observation of a,2a QFS

8He – Data on 4He+4n, 6He(g.s.)+2n, 6He(2+)+2n, 3H+5H clustering

9He – 1/2+ virtual ground state is proven, scattering length limit

a > –20 fm is imposed; broad 1/2− and 5/2+ resonances

at ~2 and ~4.5 MeV are obtained

Dolores Cortina talk

8He − Cross sections for population of resonant states 0+, 2+, (1+) in 6He+t reaction are determined to be :200, < 250, < 125 b/sr;possibility of a more consistent explanation of the near threshold 8He spectra :E1 peak below 2+ state

10He − The population cross section of the 3 MeV peak in 10He s10 = 140(30) mb/sr

is consistent with the estimated resonance cross section for the population

of the 10He 0+ state with the [p1/2]2 structure

http://aculina.jinr.ru -> publications

slide6

Main recent resultsand near future plans

6He, 6Li – Complete and incomplete fusion reaction with rear

earth targets 166Er and 165Ho at energy of 10 AMeV

6Be – Two-proton decay of the ground state resonance and

properties of exited states in the 6Li(p,n)6Be reaction

26S – Estimation of half-live (T1/2 < 70 ns) and

energy of two-proton decay (E > 600 keV)

8He –b-delayed particle emission studies with OTPC;

BGT for rear decay branches a+t+n, 7Li+n and 6He+d

now

future past

prepared to be publish

6He, 8He – Further study of the QFS reactions at E ~ 45 AMeV:

6He+4He 2a+2n, 6He+4He a+t+3H, 8He+4He a+6He+2n

17Ne – Possible unique case of two-proton halo study

in the 17Ne+p QFS and 18Ne(p,d)17Ne reactions

10He, 13Li, 14Be, 18C– 2n transfer reactions with the use

of the cryogenic tritium target and

interference of broad states in a level structure

slide7

8He & 10He: 3H(6He,p)8He &3H(8He,p)10He reactions

DSSD +SSD

DSSD +SSD’s

tritium target

SSD’s

MWPC

6He, 8He

Beams

E~28AMeV

Plastic-Veto

slide8

neutron multi detector of 64 modules is beeing constructed, now we have 32 stibene crystals  80 x 50 mm3

8He & 10He: 3H(6He,p)8He &3H(8He,p)10He reactions

slide9

S. Mianowski, et al., Acta Phys. Pol. B 41(2010) 449

OTPC

S. Mianowski, et al., Acta Phys. Pol. B 41(2010) 449

K. Miernik et al.,

NIM A 581(2007)194

8He b-delayed particle emission studies with OTPC

Exp: M.Borge et al., NPA560(1993)664 β-delayed t (8.00.5)10-3

Theory:L.Grigorenko, N.Shulgina, M.Zhukov, NPA607(1996)277

2009&2010: BGT for rear decay branches

a+t+n, 7Li+n and 6He+d

Bertram Blank talk

A new OTPC detector is under construction at ACCULINNA in collaboration with Warsaw University (OTPC group)

slide10

A new in−flight separator ACCULINNA2

☻ High intensity (~5* pA) and broader variety of beams from U400M cyclotron (*with new ECR)☺ Large acceptance (factor 6,ACC2/ACC) and high energy resolution (LTOF = 38 m vs 21 m)☻ Large experimental area (possibility to have several setups, neutron and gamma array, zero-angle spectrometer)☺ Efficient work with proton-rich RIBvia RF kicker☻ At F3 plane RIB can be transmitted to ISOL line (via extraction gas cell)☺ Wide RIB energy range 6÷60 AMeV ☼ Tritium beam (I~108 pps) and cryogenic tritium target (5*1021 At/cm2)

slide11

A new in−flight separator ACCULINNA2

Key pointsi) High precision reaction studies & correlation measurements

ii) Combination of ISOL and fragmentation methods

Iii) Beam usage concept (continuous usage, one instrument

for several experimental areas, wide energy range 6÷60AMeV)

Full range of structure and reaction

Transfer reactions

Resonance elastic scattering

Coulomb dissociation

Decays: 1p, 2p, b-delayed, g, etc.

Fusion-fission near Coulomb Barrier

Laser spectroscopy

Astrophysical research

Direct measurements - (p,p’), (a,a’), resonance scattering

Decays via beam stopping

“Trojan horse” methods - transfer reactions

Inverse kinematics reaction measurements, coulex

slide12

structure of neutron rich nuclei 10,12He, 14Be, 18C, 26,28O etc with the use of cryogenic tritium target and 36S & 48Ca intensive primary beams for RIB production

  • one and two proton decays 12O, 16,17Ne, 26S etc using the modern technique (OTPC, vertex method, zero-degree geometry and others) and RF-kicker for RIB purification
  • structure of neutron rich nuclei 10,12He, 14Be, 18C, 26,28O etc with the use of cryogenic tritium target and 36S & 48Ca intensive primary beams for RIB production

b)

a)

‘Ecological niche’ for the ACCULINNA−2

Nuclei laying at the neutron and proton drip-lines

in the area of light nuclei can be studied.

slide13

Characteristics of the existing and new in-flight RIB separators

(DW and Dp/p are angular and momentum acceptances, Rp/Dp is the first-order momentum resolution when 1 mm object size is assumed)

slide14

Main technical issues

F5:Achromatic

focus final image

Dx~3.2cm, Dy~2.2cm

Envelopes of the RIB in X, Y planes for a 2x2 mm2 primary beam spot in F1. Solid and dashed lines (1, 2) are for momentum acceptance Dp/p=2.5% & 1.0% respectively, curves (3, 4) show a joint action of the RF-kicker when it is on.

slide17

Status of project

1) Letter of Intent (60 pages)

2) Calculation of ion−optical system

3) Preliminary cost estimations (~6 M$)

4) TDR preparation & looking for producer

BudkerInstitute of NuclearPhysics, ScientificResearch Inst. of Electrophysical Apparatus

SIGMAPHI, Magnets and Beam Transport

Mitsubishi Electric Corporation

Tokin Machinary Corporation;

Sumitomo Heavy Industries ltd. - canceled

http://aculina.jinr.ru -> publications

slide18

Summary

  •  The RIB research at FLNR−JINR−Dubna is certainly exist
  • ACCULINNA-2 could provide an ambition to make FLNR famous

in the world not only for SHE studies

  • There are certain unique experimental opportunities and theoretical

background at FLNR, people are welcome with ideas

  • The ACCULINNA group is actively participating in R3B@FAIR

(ACC-2 or R2B is seen as a low energy part of it) ⇒

common scientific program, equipment, instrumentation etc

 Collaborations with MSU, GANIL, RIKEN and other Institutes

are foreseen and welcome