Synthesis of superheavy elements at FLNR

S. DMITRIEV

Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research,

Dubna, 141980, Russia

e-mail: dmitriev@jinr.ru

PASIFICHEM 2010,PASIFICHEM 2010,

18 December 2010, Honolulu, Hawaii, USA18 December 2010, Honolulu, Hawaii, USA

2

Synthesis of SHE via hot fusion of heavy target nuclei w ith light pro jectiles1 9 6 0 1 9 8 0

Synthesis of SHE via hot fusion of heavy target nuclei w ith light pro jectiles

R utherford ium (Z=104)

N obe lium (Z=102)Lawrencium (Z=103) S eaborg ium (Z=106)

D ubn ium (Z=105)

-B y irrad ia tion of actinides with light ions inB erkeley (U SA ) and D ubna (R ussia)the elem ents up to Z=106 could be synthesized

M endelevium (Z=101)

Synthesis of SHE via co ld fusion ( Pb and Bi as target nuclei)1 9 8 0 2 0 0 6

Synthesis of SHE via co ld fusion ( Pb and Bi as target nuclei)

H assium (Z=108)M eitnerium (Z=109)

B ohrium (Z=107)D arm stadtium (Z=110)R oentgenium (Z=111)

The line ar ac celeratorU N ILA C and theve locity filte r SH IP at GS I allow ed for the synthe sis o f elem ents w ith Z=107-112. -

Elem ent 113

Neutron periodNeutron period

A sta tin (Z =85)N eptun ium (Z =93)

A m eric ium (Z=95)C urium (Z =96)

P lu tonium (Z =94) C alifo rn ium (Z =98)

B erke lium (Z =97)

1 9 4 0 1 9 6 0

E nste in ium (Z =9 )9F erm ium (Z =100)

1934Enrico Fermi proposed toirradiate Uranium withneutrons in order to synthesize heavier elements

1938Otto Hahn andFritz Strassmanndiscover theneutron inducednuclear fission

1896Discoveryof radioactivityby A.H. Becquerel

Radioactivity periodRadioactivity period

1899Actinium (Z=89) 1908

Radon (Z=86) 1918Protactinium (Z=91)

1896 1940

1898Polonium (Z=84)Radium (Z=88) 1940

G. Flerov andK. Petrzhakdiscover thespontaneousnuclear fission

Cn

3

10-30

10-32

10-34

10-36

10-38

102 104 106

1n

4n

108 110 112 114 116 118 120

Atom ic num ber

Cro

ss s

ectio

ns (

cm)2

C old fus ion

H ot fus ion

208 209 48 50 70Pb, B i + C a, Ti,... Zn

Actin ides + N e , M g,... S 22 26 34

SHESHE

Cold & hot fusion cross sectionsCold & hot fusion cross sectionsCold & hot fusion cross sectionsCold & hot fusion cross sections

fusion

survival

4

Isotopes:

+U , Pu , Am , Cm[233, 238] [242, 244] [245, 248], [249][243] Cf Z = 112 - 118 48 Ca

beam tim e - 4000 h/y

beam intensity - 4 - 8 .10 /s

12

48Ca

Enrichment up to 68-70%(Lesnoy)

isotope productionhigh flux reactors

(Oak Ridge, Dimitrovgrad)

isotope enrichment 98-99%S-2 separator

(Sarov)

New ECR-ion sourceNew ECR-ion source(GANIL, JINR)(GANIL, JINR)

New separator & detectorsNew separator & detectors(Dubna, Livermore)(Dubna, Livermore)

New target matterNew target matter

technology of the target preparation – 0.3 mg/cm2 Separation and detection of Separation and detection of

superheavy nucleisuperheavy nuclei

Efforts focused on the synthesis of SHE

REACTORREACTORREGIMEREGIME

ACCELERATORSACCELERATORS

ISOTOPEISOTOPEENRICHMENTENRICHMENT

TARGET TECHNOLOGYTARGET TECHNOLOGY

NEWNEWRECOILRECOILSEPARATORSEPARATOR

FLNR U400 cyclotronFLNR U400 cyclotron

D u bn a G as F illed R ec o il S e p a ra to r

v (A=48) = 0.11 cq = 16.5+

v (A=288) = 0.017 cq = 6.2+

Experimental SetupExperimental Setup

7

position sensitivestrip detectors

“veto” detectors

TOF-detectors

SH-recoilside

detectors

Total detection efficiency: for α-particles…………..83% for SF-fragment…….~ 100% for both fragments……..42%

Focal plane detectorFocal plane detectorFocal plane detectorFocal plane detector

Number of observed decay chains Element 118 3 Element 116 26 Element 115 4 Element 114 43 Element 113 2 Element 112 8

9

10-30

10-32

10-34

10-36

10-38

102 104 106

1n

4n

108 110 112 114 116 118 120

Atom ic num ber

Cro

ss s

ectio

ns (

cm)2

C old fus ion

H ot fus ion

208 209 48 50 70Pb, B i + C a, Ti,... Zn

Actin ides + N e , M g,... S 22 26 34

4n-3nActin ides + C a 48

SHESHE

fusion

survival

Cold & hot fusion cross sectionsCold & hot fusion cross sectionsCold & hot fusion cross sectionsCold & hot fusion cross sections

Relatively long half-lives of isotopes of elements 104-116 produced in the reactions with 48Ca and chemical properties of SHE predicted theoretically permit new experiments aimed at:

the chemical identification of SHE (268Db)

study of their chemical properties (112,114),

determination of masses of the SHE isotopes

Number of observed decay chains Element 118 3 Element 116 26 Element 115 4 Element 114 43 Element 113 2 Element 112 8

The Bk-249 was produced at ORNL (USA) by irradiation: of Cm and Am targets for approximately 250 days by thermal-neutron flux of

2.5 1015 neutrons/cm²·s in the HFIR (High Flux Isotope Reactor). 

Irradiation ends December 2008

13

249Bk was produced at High Flux Reactor in Oak-Ridge………...March 09, 2009249Bk was produced at High Flux Reactor in Oak-Ridge………...March 09, 2009

22 mg of pure 249Bk was shipped to Moscow……………................June 20, 200922 mg of pure 249Bk was shipped to Moscow……………................June 20, 2009

Arrived at Dimitrovgrad (Russia) for target preparation……………..July 01, 2009

Experiment have started at Dubna…………….....................................July 27, 2009

60 0

6 cm2

310 μg/cm2 BkO2

on 1.5 μm-Ti foil

120 mm

ω = 1700 rpm

TargetTarget

target-making June 2009

Yu. O

ganess

ian 2

010

48C a-ions

rota ting en trancew indow

gas-filledcham ber

de tecto rsta tion

recoils

position sensitivestrip detectors

TO F-de tecto rs

“ve to” detecto rs

22 .50

S H recoil

s ide de tecto rs

Dubna Gas-Filled Recoil SeparatorDubna Gas-Filled Recoil Separator

Transmission for: EVR 35-40%

target-like 10-4-10-7

projectile-like 10-15-10-17

Registration efficiency:

for α-particles 87%

for SF single fragment 100% two fragments ≈ 40%

beam48Ca

Experimental technique

target249Bk

Experiment was started July 27 2009

Yu. O

ganess

ian 2

010

0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 00

5

1 0

1 5

2 0

2 5

3 0

27 1 10 20 30 40 50

10

20

30

0

Bea

m c

urr

ent

(em

A)

Beam dose 1.5*1019

1 p A

~50 days3*10 per day17

0 5 10 15 20 25 30 35 40 45 50268269270271272273274275276277278

27 1 10 20 30 50

+_0

.75

MeV

AugustJuly Septem ber

En

erg

y (

MeV

)

273

269

277

Tim e (d)

E*=39.2 M eV

4 0

First run:

from July 27 to October 23, 2009 Beam dose: 2.4·1019

0.3

%

17

2

1

3 113285

Rg

281

11.14 MeV7.89 ms23.16 mm

13.87 MeV

str.#10, 12:28 Sep.10, 2009

22.70 mm

9.52 MeV (8.98+0.54)

291.9 MeV (184.8+7.1)

2.22 s

22.67 mm4.25 s

115

117

289

293

missing

N=ran 1.10-3

N=ran 1.10-5

2

1

3 113286

Rg282

4.6 ms17.19 mm

17.41 mm

13.51 MeV

str.#10, 04:50 Sep.18, 2009

17.17 mm

0.017 s10.34 MeV

204.8 MeV (180.0+24.8)

1.16 s

16.45 mm12.03 s

SF

115

117

290

294

9.71 MeV (9.17+0.54)

11.08 MeV (6.64+4.44)

N=ran 3.10-11

10.25 MeV

2

1

3 113286

Rg282

53.01 ms122.16 mm

22.20 mm

22.09 mm

9.96 MeV

str.#8, 04:23 Oct.17, 2009

22.04 mm

0.51 s

189.4 MeV (153 +36)

0.24 s

23.19 mm76.56 s

SF

115

117

290

294

9.79 MeV

10.91 MeV

SF

11.89 MeV

str.#10, 09:40 Aug.20, 2009

2

1

3 113285

Rg

281

10.99 MeV17.01 ms15.02 mm

15.20 mm

missing

203.3 MeV

9.72 MeV16.17 s15.40 mm

14.86 mm

N=ran 6.10-6

40.19 sSF

115

117

289

293

N=ran 3.10-11

10.27 MeV (9.03+1.24)

2

1

3 113286

Rg282

20.24 ms13.33 mm

10.90 mm

23.59 mm

9.36 MeV

str.#10, 01:37 Oct.23, 2009

13.23 mm

0.42 s

194.0 MeV

13.49 s

23.19 mm76.56 s

SF

115

117

290

294

9.48 MeV

11.00 MeV

Ex=39 MeV

Beam dose: 2.4·1019

2

1

3 113

B h

286

274

270

6

5 M t278

R g282

4

10.81(10) MeV

11.00 MeV

9.56 MeV

8.43 MeV

9.14 MeV

9.43 MeV

10.23 MeV 112.4 ms

45 m s

16 s

7,4 min

13 s

8.1 s

1 s 18.97 mm

8.76 MeV

str.#5, 22:57 Nov.22, 2009

B = 2.42 Tm

19.24 mm

0.022 s9.95 MeV(40) [9.45+0.5 ]

9.55(19) MeV [8.45+1.1 ]

195.6 MeV [152.3+43.3] TKE=219(5) MeV

9.63(10) MeV 28.29 s19.51 mm

19.93 mm

9.00(10) MeV 0.74 s18.97 mm

11.05 s

33.36 h

8.80(10) MeV 76.1 s19.11 mmSF

115

117

290

294

D b

#6

10.31(9) MeV

10.48 MeV

9.96 MeV

2

1

3 113285

R g281

21 m s

10 m s

0.32 s

0.22 s

1.2 s

TKE=218(5) MeV

7.9 s

38 s

SF

115

117

289

293

9.48(11) MeV 9.74(8) MeV

11.03(8) MeV

11.26 MeV 117

2974n

Ex=39 MeV

Ex=35 MeV

Beam dose: 2.0·1019

19

Synthesis of a new element with atomic number Z=117

Yu. Ts. Oganessian,1) F. Sh. Abdullin,1) P. D. Bailey,2) D. E. Benker,2) M. E. Bennett,3) S N. Dmitriev,1) J. G. Ezold,2) J. H. Hamilton,4) R. A. Henderson,5) M. G. Itkis,1) Yu. V. Lobanov,1) A. N. Mezentsev,1) K. J. Moody,5) S. L. Nelson,5) A.N. Polyakov,1) C. E. Porter,2) A. V. Ramayya,4) F. D. Riley,2) J. B. Roberto,2) M. A. Ryabinin,6) K. P. Rykaczewski,2) R. N. Sagaidak,1) D. A. Shaughnessy,5) I.V. Shirokovsky,1) M. A. Stoyer,5) V. G. Subbotin,1) R. Sudowe,3) A. M. Sukhov,1) Yu. S. Tsyganov,1) V. K. Utyonkov,1) A. A. Voinov,1) G. K. Vostokin,1) and P. A. Wilk5)

1 Joint Institute for Nuclear Research, RU-141980 Dubna, RF2 Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA3 University of Nevada Las Vegas, Las Vegas, NV 89154, USA4 Vanderbilt University, Nashville, TN 37235, USA5 Lawrence Livemore National Laboratory, Livermore, CA 94551, USA6 Research Institute of Atomic Reactors, RU-433510 Dimitrovgrad, RF (Dated: April 1, 2010)

The discovery of a new chemical element with atomic number Z=117 is reported. The isotopes 293117 and 294117 were produced in fusion reactions between 48Ca and 249Bk. Decay chains involving eleven new nuclei were identified by means of the Dubna Gas Filled Recoil Separator. The measured decay properties show a strong rise of stability for heavier isotopes with Z≥111, validating the concept of the long sought island of enhanced stability for super-heavy nuclei

20

IsotopeDecaymode Half-lifea E (MeV) Q (MeV) Isotope

Decaymode

Half-lifea E (M eV) Q (MeV)

293117 14 11

4 ms 11.030.08 11.180.08 294

117 78 37 036

ms 10.810.10 10.960.10

289115 220 26 080

ms10.310.09 10.450.09 290115 16 75

8 ms 9.950.40 10.090.40

285113 5.5 0.57.3

s

9.740.089.480.11

9.880.08 286113 20 949

s 9.630.10 9.760.10

281Rg SF 26 258

s <9.4 282Rg 0.51 5.2

23.0 s 9.000.10 9.130.10

278M t 7.7 .375.3

s 9.550.19 9.690.19

274Bh 53 25 024

s 8.800.08 8.930.08

270Db SF //EC

23 11010

h

<7.9

Decay properties of the nuclei in the decay chains of Z=117 isotopes

Yu.

Oga

nes

sian

20

10

21

Target (249 Bk; 0,5 mg/cm2)

SiO2- Ta800°C

(4(4))

He/Ar (70/30)

CHEMISTRY OF THE 113 CHEMISTRY OF THE 113 ELEMENTELEMENTCHEMISTRY OF THE 113 CHEMISTRY OF THE 113 ELEMENTELEMENT

Au - 113Au - 11316 pairs

2.5m

1 L/min

22

Capillary length from target chamber to detector system is 2.5 mCapillary length from target chamber to detector system is 2.5 m

23

16 pairs of gold covered detectors16 pairs of gold covered detectors

24

4848Ca + Ca + 249249BkBk

Target 249Bk (0.5 mg∙cm-2)

natNd (30 μg∙cm-2)

48Ca Emid. target = 252 MeVI ~ 9 eμA

Irradiation: - 18.04.2010 – 31.05.2010;

target I - 3.5 1018 ; target II - 5.6 1018

9.1∙1018

25

Alpha and SF spectraAlpha and SF spectra

DGFRSDGFRS 04 04 MayMay 2010 10:05:46 2010 10:05:46 16 16 MayMay 2010 02:29:54 2010 02:29:54 Bk-target I Bk-target I Bk-target II Bk-target II

115115290290

αα22

113113286286

8.89 MeV8.89 MeV64.90 64.90 ss

MtMt278278

αα44RgRg

282282

αα33

9.52 MeV9.52 MeV6.49 6.49 ss

BhBh274274

αα55

SFSF101.0 + 89.1 MeV101.0 + 89.1 MeV

79.25 79.25 hh

αα66

8.77 MeV8.77 MeV13.59 13.59 minmin

DbDb270270

249249Bk + Bk + 4848CaCa3n3n

9.62 MeV9.62 MeV

117117294294

αα

11

Bot. 8Bot. 8

Bot. 8Bot. 8

Bot. 8Bot. 8

Bot. 8Bot. 8

115115290290

9.95(40) MeV10.23 MeV

αα22

113113286286

99..00(10)00(10) MeV MeV9.43 MeV9.43 MeV

MtMt278278

αα44RgRg

282282

αα33

9.59.55(19)5(19) MeV MeV9.9.1414 MeV MeV

BhBh274274

αα55

SFSF

TKE = 219(5)TKE = 219(5) MeV MeV3333..44 hh

αα

668.8.80(10)80(10) MeV MeV

8.43 MeV8.43 MeV

DbDb270270

9.69.63(10)3(10) MeV MeV9.56 MeV9.56 MeV

117117294294

10.81(10) MeV11.00 MeV

αα11

1.3 min1.3 min7.4 min7.4 min

11.0 s11.0 s13 s13 s

0.74 s0.74 s8.1 s8.1 s

28.3 s28.3 s16 s16 s

0.023 s0.023 s1.0 s1.0 s

112 ms112 ms45 ms45 ms

117117292977

E* = 35 MeVE* = 35 MeV

1 event1 event

115115290290

αα22

113113286286

9.9.0101 MeV MeV1.85min1.85min

MtMt278278

αα44RgRg

282282

αα33

BhBh274274

αα55

SFSF98.6 + 88.5 MeV98.6 + 88.5 MeV

64.664.611 hh

αα668.648.64 MeV MeV<<1.1.4242 minmin

DbDb270270

249249Bk + Bk + 4848CaCa3n3n

117117294294

αα11

Bot. Bot. 44

TopTop 4 4

26

prel

imin

ary

DGFRSDGFRS 04 04 MayMay 2010 10:05:46 2010 10:05:46 16 16 MayMay 2010 02:29:54 2010 02:29:54 Bk-target I Bk-target I Bk-target II Bk-target II

115115290290

αα22

113113282866

8.89 8.89 MeVMeV

64.90 64.90 ss

MtMt278278

αα44RgRg

282282

αα33

9.52 9.52 MeVMeV

6.49 6.49 ssBhBh272744

αα55

SFSF101.0 + 89.1 MeV101.0 + 89.1 MeV

79.25 79.25 hh

αα66

8.77 8.77 MeVMeV

13.59 13.59 minmin

DbDb270270

249249Bk + Bk + 4848CaCa 3n3n

9.62 9.62 MeVMeV

117117294294

αα

11

Bot. 8Bot. 8

Bot. 8Bot. 8

Bot. 8Bot. 8

Bot. 8Bot. 8

115115290290

9.95(40) MeV

10.23 MeV

αα22

113113286286

99..00(10)00(10) MeVMeV

9.43 MeV9.43 MeVMtMt278278

αα44RgRg

282282

αα33

9.59.55(19)5(19) MeVMeV

9.9.1414 MeV MeVBhBh274274

αα55

SFSF

TKE = 219(5)TKE = 219(5) MeV MeV3333..44 hh

αα

668.8.80(10)80(10)

MeVMeV8.43 MeV8.43 MeV

DbDb270270

9.69.63(10)3(10) MeVMeV

9.56 MeV9.56 MeV

117117294294

10.81(10) MeV

11.00 MeV

αα11

1.3 min1.3 min7.4 min7.4 min

11.0 s11.0 s13 s13 s

0.74 s0.74 s8.1 s8.1 s

28.3 s28.3 s16 s16 s

0.023 s0.023 s1.0 s1.0 s

112 ms112 ms45 ms45 ms

117117292977

E* = 35 MeVE* = 35 MeV

1 event1 event

115115290290

αα22

113113286286

9.9.0101 MeVMeV

1.85m1.85minin

MtMt272788

αα44RgRg

282282

αα33

BhBh272744

αα55

SFSF98.6 + 88.5 MeV98.6 + 88.5 MeV

64.664.611 hh

αα668.648.64 MeVMeV

<<1.1.4242 minmin

DbDb272700

249249Bk + Bk + 4848CaCa 3n3n117117

294294

αα11

Bot. Bot. 44

TopTop 4 4

27

prel

imin

ary

29

Hg-185 DISTRIBUTIONHg-185 DISTRIBUTIONHg-185 DISTRIBUTIONHg-185 DISTRIBUTION

30DGFRSDGFRS

Chemistry of the Element 113Chemistry of the Element 113Chemistry of the Element 113Chemistry of the Element 113

115115228888

113113282844

9.9.7575 MeV MeV33..66 ss

MtMt272766

RgRg282800

9.9.7171 MeV MeV00..7272 ss

BhBh272722

SFSF

TKE = 205(5) MeVTKE = 205(5) MeV16 h16 h

99..0202 MeV MeV99.8 .8 ss

DbDb226868

243243Am + Am + 4848CaCa3n3n

1010..000 MeV0 MeV0.48 s

αα22

αα44

αα33

αα55

αα11

1010..4646 MeV MeV87 ms

115115228899

10.31(9) MeV10.48 MeV

αα22

113113282855

αα33

SFSF

TKE = 218(5)TKE = 218(5) MeV MeV3838 ss

RgRg228181

9.9.74(8)74(8) MeV MeV9.48(11) MeV9.48(11) MeV

9.96 MeV9.96 MeV

117117292933

11.03(8) MeV11.26 MeV

αα11

7.9 s7.9 s1.2 s1.2 s

0.32 s0.32 s0.22 s0.22 s

21 ms21 ms10 ms10 ms

117117292977

115115290290

9.95(40) MeV10.23 MeV

αα22

113113286286

99..00(10)00(10) MeV MeV9.43 MeV9.43 MeV

MtMt278278

αα44

RgRg282282

αα33

9.59.55(19)5(19) MeV MeV9.9.1414 MeV MeV

BhBh274274

αα55

SFSF

TKE = 219(5)TKE = 219(5) MeV MeV3333..44 hh

αα668.8.80(10)80(10) MeV MeV

8.43 MeV8.43 MeV

DbDb270270

9.69.63(10)3(10) MeV MeV9.56 MeV9.56 MeV

117117294294

10.81(10) MeV11.00 MeV

αα11

1.3 min1.3 min7.4 min7.4 min

11.0 s11.0 s13 s13 s

0.74 s0.74 s8.1 s8.1 s

28.3 s28.3 s16 s16 s

0.023 s0.023 s1.0 s1.0 s

112 ms112 ms45 ms45 ms

117117292977249249Bk + Bk + 4848CaCa

Experimental program of 2011-2012Experimental program of 2011-2012Experimental program of 2011-2012Experimental program of 2011-2012

Chemistry of 113 element (243Am + 48Ca)

Chemistry of 114 element (244Pu + 48Ca)

Mass number measurement of 112 - 114 elements 242Pu(48Ca,3n)287114(0.5s,α) –> 283112(4 s) 243Am(48Ca,3n) –> 288115 (0.1 s, α) –> 284113(0.5 s)

Introduction

MAss Separator of Heavy

Atoms

The proposed setup is a combination of the so-called ISOL method of synthesis and separation of radioactive nuclei with the classical method of mass analysis, allowing mass identification of the synthesized nuclides in the wide mass range.

Ion source

Detectors

D1 Q1 Q2D2

Q3S1

D3aD3b

S2

General ion-optical parameters: Range of energy variation, kV 15-40Range of Br variation, Tm 0.08-0.5Mass acceptance, % +/-2.8Angular acceptance, mrad +/-14Diameter the ion source exit hole, mm 5.0Horizontal magnification at F1/F2 0.39/0.68Mass dispersion at F1/F2, mm/%

1.5/39.0Linear mass resolution at F1 75Mass resolution at F2 1150

Mass-spectrometer MASHA at the beam line of the Mass-spectrometer MASHA at the beam line of the cyclotron U-400Mcyclotron U-400M

STATUS of the MASS-SPECTROMETERSTATUS of the MASS-SPECTROMETERSTATUS of the MASS-SPECTROMETERSTATUS of the MASS-SPECTROMETER

Heavy ionbeam

Target

Hot catcher(graphite)

1TO

12, 114 ECR

Heater

Separating foil

FIRST EXPERIMENTSFIRST EXPERIMENTS

• Mass identification ofMass identification of 112 и 114 112 и 114 elements synthesizedelements synthesized at the reactionsat the reactions

242242Pu(Pu(4848Ca,3n)Ca,3n)287287114(0.5 s) –> 114(0.5 s) –> 283283112(4 s)112(4 s)

• Mass Mass identification identification ofof 11 1133 elements synthesizedelements synthesized at the at the reactionreaction

224343Am(Am(4848Ca,3n)Ca,3n)288288115 (0.1 s) 115 (0.1 s) →→284284113 (0.5 s)113 (0.5 s)

FIRST EXPERIMENTSFIRST EXPERIMENTS

• Mass identification ofMass identification of 112 и 114 112 и 114 elements synthesizedelements synthesized at the reactionsat the reactions

242242Pu(Pu(4848Ca,3n)Ca,3n)287287114(0.5 s) –> 114(0.5 s) –> 283283112(4 s)112(4 s)

• Mass Mass identification identification ofof 11 1133 elements synthesizedelements synthesized at the at the reactionreaction

224343Am(Am(4848Ca,3n)Ca,3n)288288115 (0.1 s) 115 (0.1 s) →→284284113 (0.5 s)113 (0.5 s)

DRIBs-IIIDRIBs-IIIDRIBs-IIIDRIBs-III

Creation of the new experimental hallCreation of the new experimental hall (≈ 2 (≈ 26600 м00 м22)) Creation of high current heavy ion acceleratorCreation of high current heavy ion accelerator Development and creation of next generation set-upsDevelopment and creation of next generation set-ups

2010 -2016 2010 -2016

Gas-Filled Separator

Ready time must be synchronized with the construction of the new experimental hall & accelerator

ADVANTAGES: presence of a gas – H2,

He; high energy and charge

acceptances; additional target

cooling through convection;

low number of elements;

no high voltage.

NEW EXPERIMENTAL HALL

4000 6000 8000 10000 12000

100

101

102

103

104

105

106

107

Co

un

ts /

5 k

eV

7450

8785

5650 5867

66206805

211Po211At

185Hg

212Po

219Rn + 216Po

211Bi

20 40 60 80 100 120 140 160 180 200

100

101

102

103

Counts

/ 0

.05 M

eV

2 FF coincidedAlphas

4000 6000 8000 10000 12000

100

101

102

103

104

105

Co

un

ts /

5 k

eV

Energy (keV)

7450

8785

56505867

6620

6805

211Po

211At

185Hg

212Po

219Rn + 216Po

211Bi

20 40 60 80 100 120 140 160 180 200

100

101

102

103

Co

un

ts /

0.0

5 M

eV

Energy (MeV)

2 FF coincidedAlphas

a) b)

c) d)

a). Cumulative alpha spectrum from 16 pairs of detectors b). Cumulative spectrum of fission fragments from 16 pairs of detectorsc). Cumulative alpha spectrum from 8th pair of detectors d). Cumulative spectrum of fission fragments from 8 th pair of detectors

4000 6000 8000 10000 12000

100

101

102

103

104

105

106

107

Co

un

ts /

5 k

eV

7450

8785

5300

5650

5867

6620

6805

211Po

211At210Po

185Hg

212Po

219Rn + 216Po

211Bi

20 40 60 80 100 120 140 160 180 200

100

101

102

103

Co

un

ts /

0.0

5 M

eV

2 FF coincidedAlphas

4000 6000 8000 10000 12000

100

101

102

103

104

105

Co

un

ts /

5 k

eV

Energy (keV)

7450

8785

53005650

5867 211Po

211At210Po

185Hg

212Po

6620

6805211Bi

219Rn + 216Po

20 40 60 80 100 120 140 160 180 200

100

101

102

103

Co

un

ts /

0.0

5 M

eV

Energy (MeV)

2 FF coincidedAlphas

a). Cumulative alpha spectrum from 16 pairs of detectors b). Cumulative spectrum of fission fragments from 16 pairs of detectorsc). Cumulative alpha spectrum from 4th pair of detectors d). Cumulative spectrum of fission fragments from 4 th pair of detectors

a) b)

c) d)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 160

5

10

15

20

25

30

35

40

45

50

55

Exp 209At

Sim 209At

Exp 185Hg

Yie

ld, %

Det #

Bk-target I

286113

Chromatographic deposition of 209At and 185Hg in the detector array at 0°C together with a standard Monte-Carlo simulation of the 209At deposition.

The deposition of 185Hg compared to the deposition of 209At in the isothermal detector array at 0°C together with Monte-Carlo simulation of the depositions. The Hg deposition points to an efficient chromatographic gold surface the second part of the experiment.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 160

10

20

30

40

50 Exp Hg-185 Sim Hg Exp At-209 Sim At

Yie

ld, %

Det #

Bk-target II

286113

THANK YOU THANK YOU FOR YOUR TIME!FOR YOUR TIME!

THANK YOU THANK YOU FOR YOUR TIME!FOR YOUR TIME!