aJoint Institute for Nuclear Research, Dubna, RussiabInstitute of Nuclear Physics PAN, Krakow, Poland

cRRC The Kurchatov Institute, Moscow, RussiadCyclotron Institute, Texas A&M University, College Station, USA

eInstitute of Experimental Physics, Warsaw University, Warsaw, PolandfGesellschaft für Schwerionenforschung mbH, Darmstadt, Germany

gUNIRIB, Oak Ridge Associated Universities, Oak Ridge, USAhNSCL, Michigan State University, East Lansing, Michigan, USA

iDepartment of Physics, University of Surrey, Guildford, UKjFundamental Physics, Chalmers University of Technology, Göteborg, Sweden

ACCULINNA-2 collaborationA.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

The new intermediate energy in-flight facility ACCULINNA-2

RIBs projects at FLNR ACCULINNA separatorDetails of a new RIB facility ACCULINNA-2

10m

0

R IB

400-cm cyclotron

stable ion beams: now 7Li@34 AMeV

DubnaRadioactive IonBeamsDRIBs-I

Electron acceleratorPhoto-fission induced RIBs (Project)

Low energybeam line

DIRECT

Acculinna

DIRECTCombas

400-cm cyclotronand injection line

RIBs: now6He@10 AMeV

→ DRIBs-III 2010-2016

ISOL

Production target and ECR source

10m

0

R IB Dubna Radioactive Ion Beams III (DRIBs III)

Existing experimental

facilities

Acculinna

Combas

MASHA

Planed experimental facilities

Acculinna−2

* 1996 – first experiment** 2000 – last upgrade*** 2010 – next step Acc.2

U−400M cyclotron:7Li,11B,18O @ 33 AMeV20Ne, 32S @ 50 AMeV

ACCULINNA separatormain parameters

small angular acceptance

ToF base is short enough - 8.5 m

x2

the size of a beam spot at F4 is two times more than it’s at F3 because of optic asymmetry

Limited space in the final focus plane and, finally, purification of proton-rich secondary beams is not so good.

“Scientific facilities, which are not upgraded

after 10 years of functioning become rotten…”

H. Simon@gsi.de

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

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 ,2 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 > – 20 fm is imposed; broad 1/2− and 5/2+ resonances at ~2 and ~4.5 MeV are obtained

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 10 = 140(30) b/sr

is consistent with the estimated resonance cross section for the population

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

5H – ER = 1.8 MeV, = 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.

Main results since 2000

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

Dolo

res C

ort

ina

talk

Main recent results and near future plans

17Ne – Possible unique case of two-proton halo study in the 17Ne+p QFS and 18Ne(p,d)17Ne reactions

6Be – Two-proton decay of the ground state resonance and properties of exited states in the 6Li(p,n)6Be reaction

6He, 8He – Further study of the QFS reactions at E ~ 45 AMeV: 6He+4He 2+2n, 6He+4He +t+3H, 8He+4He +6He+2n

10He, 13Li, 14Be, 18C – 2n transfer reactions with the use of the cryogenic tritium target and

interference of broad states in a level structure

6He, 6Li – Complete and incomplete fusion reaction with rear earth targets 166Er and 165Ho at energy of 10 AMeV

26S – Estimation of half-live (T1/2 < 70 ns) and energy of two-proton decay (E > 600 keV)

8He – -delayed particle emission studies with OTPC;BGT for rear decay branches +t+n, 7Li+n and 6He+d

prepared to be publish

futu

re

p

ast

now

MWPC

Plastic-Veto

DSSD +SSD

DSSD +SSD’s

tritium target

SSD’s

6He, 8HeBeams

E~28AMeV

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

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

neutron multi detector of 64 modules is beeing constructed,

now we have 32 stibene crystals 80 x 50 mm3

8He -delayed particle emission studies with OTPC

Exp: M.Borge et al., NPA560(1993)664 β-delayed t (8.00.5)10-3

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

K. Miernik et al., NIM A 581(2007)194

OTPC

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

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

A new OTPC detector is under construction at ACCULINNA in

collaboration with Warsaw University (OTPC group)

2009&2010: BGT for rear decay branches

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

Bertram Blank talk

COMBAS

DRIBs

Gas catcher

MSP-144

To U-400R cyclotron 0 2 4 6 8 10 m

A new in−flight separator ACCULINNA2

☻ High intensity (~5* pA) 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)

COMBAS

DRIBs

Gas catcher

MSP-144

To U-400R cyclotron 0 2 4 6 8 10 m

Key points i) 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)

Astrophysical researchDirect measurements - (p,p’), (,’), resonance scattering

Decays via beam stopping“Trojan horse” methods - transfer reactions

Inverse kinematics reaction measurements, coulex

Full range of structure and reactionTransfer reactions

Resonance elastic scatteringCoulomb dissociation

Decays: 1p, 2p, -delayed, , etc. Fusion-fission near Coulomb Barrier

Laser spectroscopy

A new in−flight separator ACCULINNA2

‘Ecological niche’ for the ACCULINNA−2

a)

a) 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) 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) 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

Nuclei laying at the neutron and proton drip-lines in the area of light nuclei can be studied.

ACC / ACC-2FLNR

RIPS / BigRIBSRIKEN

A1900MSU

FRS / SuperFRSGSI

LISE3GANIL

, msr 0.9 / 5.8 5.0 / 8.0 8.0 0.32 / 5.0 1.0

p/p, % ± 2.5 / ± 3.0 ± 3.0 / 6.0 ± 5.5 ± 2.0 / 5.0 ± 5.0

Rp/p 1000 / 2000 1500 / 3300 2915 8600 / 3050 2200

B, Tm 3.2 / 3.9 5.76 / 9.0 6.0 18 / 18 3.2 - 4.3

Length, m 21 / 38 27 / 77 35 74 / 140 19(42)

E, AMeV 10÷40 / 6÷60 50÷90 / 350 110÷160 220÷1000/1500 40÷80

Remarks No superconductive

elements

/ Superconductive elements

Superconduc-tive elements

/ Superconductive elements

One SC element

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

Characteristics of the existing and new in-flight RIB separators

COMBAS

DRIBs

Gas catcher

MSP-144

To U-400R cyclotron 0 2 4 6 8 10 m

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 p/p=2.5% & 1.0% respectively, curves (3, 4) show

a joint action of the RF-kicker when it is on.

F5: Achromatic focus final imagex~3.2cm, y~2.2cm

Main technical issues

Value units D1 D2 ST1, ST2

Type sector sector rectangular

Gap height 2h cm 10 10 10

Bending mean radius R m 3.0 3.0

Bending field BmaxT 1.3 1.3 0.05

Length Leffcm 2356 2356 30

Working width 2w cm 24 24 24

Bending angle dgr 45 45

Value units Q1 Q2,10,13 Q3 Q4,5,7,8,11,12,14 Q6,9

Aperture 2r cm 12 24 24 17 24

Length Leffcm 54.2 85.7 76.9 45.9 52.3

Field gradient GmaxT/m 9.2 7.6 3.8 10.0 6.2

Multipole Aperture2r (cm)

Length Leff (cm)

Sextupole strenghtSmax (T/m2)

Octupole strenghtSmax (T/m3)

M1, M3 24 28.6 1.9 8.2

M2, M4 17 28.6 20.0

M5 17 28.6 7.5 32.0

Ion-opticalparameters

of Acculinna-2

RFkicker

Electrode vertical gap 2h cm 7

Electrode width 2w cm 15

Electrode length L cm 100

Electric field amplitude EmaxkV/cm 15

Frequency f MHz 13÷15

Main

tech

nic

al is

sues

Est

imati

on

s fo

r A

CC

−2

an

d u

pg

rad

ed

IS

OL

com

ple

xHI I, pA E, AMeV RIB E, AMeV I, pps/pμA Purity, %

7Li 5 34 6He 21.7 4.1×107 99

6He 6 2.1×105 99

7Be 22.4 5.9105 70

11B 5 33 8He 21.9 8.6×104 99

8He 15.6 3.7×104 99

8B 15.8 2.2×106 28

15N 5 47 11Li 33.2 7.2×103 99

18O 3 48 11Li 31.3 7.4×103 81

14Be 34.6 1.6×103 99

15B 32.1 4.3×105 97

16C 28.8 2.8×107 99

20Ne 5 54 13O 24.2 1.5×106 10

14O 22.8 3.4×107 54

17Ne 29.0 5.4×106 69

36S 3 49 24O 23.4 2.5×103 62

14Be 29.2 3.8×103 67

17C 25.0 1.1×105 78

18C 25.5 1.9×104 11

32S 3 52 24Si 11.3 7.2×103 31

27S 21.7 3.7×102 1

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

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

Budker Institute of Nuclear Physics, Scientific Research Inst. of Electrophysical Apparatus

SIGMA PHI, Magnets and Beam Transport

Mitsubishi Electric CorporationTokin Machinary Corporation;

Sumitomo Heavy Industries ltd. - canceled

COMBAS

DRIBs

Gas catcher

MSP-144

To U-400R cyclotron 0 2 4 6 8 10 m

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