107th session of the jinr scientific council 18–19 february 2010, dubna yuri oganessian flnr...

107th Session of the JINR SCIENTIFIC COUNCIL18–19 February 2010, Dubna

Yuri Oganessian FLNR (JINR)

Status of the experiments on the synthesis of Element 117

for collaboration

FLNR, JINR (Dubna) ORNL (Oak-Ridge, USA) LLNL (Livermore, USA)

IAR (Dimitrovgrad, Russia)

Vanderbilt University (Nashville, USA)

Collaboration

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87 m s

17 m s

0.48 s0.10 s

0.17 s

0.72 s

9.8 s

1.2 h 30 h

3.6 s

115 /2 88

113 /2 84

111/28 0

10 9/276

10 7/272

10 5/26810 5/267

10 9/275

111/27 9

113 /2 83

115 /2 8732 m s

PHYSICAL REVIEW C 69, 021601(R) (2004)

RAPID COMMUNICATIONS

Experiments on the synthesis of element 115 in the reaction 243Am(48Ca, xn)291−x 115

Yu. Ts. Oganessian et al.,

Yu.O. “SHE”, at the Colloquium, ORNL, 02/10/05

243Am + 48Ca

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3-4n249Bk +48Ca

α1

α2

α3

α4

α5

α6

α7

3-4n

Alp

ha-

de

cay

en

erg

y Q

(M

eV)

249Bk+48Ca249Bk+48Ca

Symposium “Prof. Joseph Hamilton: 50-year career at Vanderbilt University”.

October 2-3, 2008, Nashville, USA

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Scientific Collaboration and Material Transfer Agreement № 500-09-01 between the

UT-Battelle, LLC, the Management and Operating Contractor for Oak-Ridge National Laboratory, Oak Ridge, TN, USA

andthe Flerov Laboratory of Nuclear Reactions

Joint Institute for Nuclear ResearchDubna, Russia

The material produced by ORNL will be used for carrying out a joint experiment on the synthesis of new super-heavy chemical element

Z=117 of the Periodic System of Elements for studying the features of this element and its radioactive decay products and for studying the

formation of super-heavy nuclei in heavy-ion reactions.

UT-BATTELLE, LLC JINR

Name: K.P. Rykaczewski Name: Yu.Ts. Oganessian Spectroscopy task leader Scientific leader of FLNR

Deputy Director J.R. Roberto Director A.N. SissakianMarch 02, 2009 March 12, 2009

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Yu. Oganessian. “Status of the experiment on the synthesis Z=117”. JINR SC, Feb.18-19, 2010, Dubna

10-5

10-3

10-2

10-1

10-4

100

101

293292

243 50A m + Ti

249 48B k+ C a

238 55U + M n

294 295 296 297 298

Compound nucleus mass number

Cro

ss s

ectio

ns

(pb)

3n4n

Z.H. Liu and Jing-Dong Bao. Phys. Rev., C80, 034601 (2009)

249Bk (320d)

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high intensity of 48Cabeam (~1.5 pμA)

beam dose ≥3·1019

U- 400 FLNR, JINR

Reaction: 249Bk + 48Ca → 297117* →→ 294-293117 + 3-4n

T1/2=320d

high neutron fluxHIFR, ORNL

chemical separation

from 252Cf (factor >108)

target preparation 36cm2

0.25 μm BkO2+ 1.6 μmTi

IAR, Dimitrovgrad

Separation, Detection & Identification

1 SH-atom / 1012 reaction products

DGFRSDubna Gas-filled Recoil Separator

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3·108

4.5·1019

1event|Z=117→ 0.14pb

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

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The purified product contained 22.2 mg of Bk-249, approximately 1.7 ng of Cf-252, and no otherdetectable impurities.

Chemical isolation of the Bk-fraction May 2009

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50 Ci50 Ci

60 0

6 cm2

310 μg/cm2 BkO2

on 1.5 μm-Ti foil

120 mm

ω = 1700 rpm

TargetTarget

target-making June 2009

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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

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0 5 10 15 20 25 30 35 40 45 500

5

10

15

20

25

30

27 1 10 20 30 40 50

10

20

30

0

Bea

m c

urre

nt (

eA

)

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

(0.2

5%

)

AugustJuly September

Ene

rgy

(Me

V)

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

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117293

110.7–11.4 MeV

Δy=y1-y0 ≤ 2.2 mm≤ 132 ms

7–15 MeV

y0

48Ca

249Bktarget

the beam was switched off

SF

2

3

low-background detection scheme

9.79 MeV

22.09 mm0.24 s

189.4 MeV

22.01 mm31.66 s

10.25 MeV

22.20 mm0.51s

10.91 MeV

22.16 mm53.01 ms

9.96 MeV22.04 mm

focal planedetector array

separator

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4m

1680 h

80 h

10-3/s

2·10-6/sper strip / position

beam-on

beam-off

213Po 212Po(α+e-) (α+e-)

Spectra of the α-like signals

211Po214Po

beam-off

beam-on

252,254Cf

80 h

1680 h

7·10-5/s

Spectra of fission-like signals

1.5·10-7/s

212Po

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111SF

113

115

117α1

α2α3

25 30 400.05

0.1

0.5

5

10

1

45 50 5535

3n

4n

Excitation energy of the 297117* (MeV)

Cro

ss s

ectio

ns

(pb)249Bk + 48Ca

Y. Abe et al., Int. J. Mod. Phys. 17 (2008) 2214

V.I. Zagrebaev & W GreinerPhys. Rev. C78, 034610 (2008)

Z.H. Liu & Jing-Dong BaoPhys. Rev. C80, 034601 (2009)

Calc.

Cross sectionsCross sections

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294

293

ACN=297


11.89 MeV

str.#10, 2.37 Tm09:40 Aug.20, 2009

B =

2

1

3 113285

Rg281

10.99 MeV 17.01 ms15.02 mm

15.20 mm

missing

203.3 MeV

9.72 MeV 16.17 s15.40 mm

14.86 mm

N =ran 6 . 1 0 -6

40.19 sSF

115

117

289

293

#1

2

1

3 113285

Rg281

11.14 MeV 7.89 ms23.16 mm

13.87 MeV

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

B = 2.37 Tm

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

SF

115

117

289

293

missing

N =ran 1 . 1 0 -6

#2

N =ran 1 . 1 0 -5

2

1

3 113286

Rg282

4.6 ms17.19 mm

17.41 mm

13.51 MeV

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

B = 2.42 Tm

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)

#3

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

B = 2.42 Tm

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

#5

N =ran 3 . 1 0 -11

2

1

3 113286

Rg282

53 ms22.16 mm

22.20 mm

22.09 mm

9.96 MeV

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

B = 2.36 Tm

22.04 mm

0.51 s10.25 MeV

189.4 MeV (153.5+35.9 )

0.24 s

22.01 mm31.66 s

SF

115

117

290

294

9.79 MeV

10.91 MeV

#4

2

1

3 113

Bh

286

274

270

6

5 Mt278

Rg282

4

10.81 MeV112.4 ms18.97 mm

8.76 MeV

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

B = 2.42 Tm

19.24 mm

0.022 s9.95 MeV (9.45+0.5)

9.55 MeV (8.45+1.1)

195.6 MeV (152.3+43.3)

9.63 MeV28.29 s19.51 mm

19.93 mm

9.00 MeV0.74 s18.97 mm

11.05 s

33.36 h

8.80 MeV76.1 s19.11 mm

SF

115

117

290

294

Db

#6

Ex=39 MeV

(48Ca,4n)

Ex=35 MeV

(48Ca,3n)

3n

Ex= 39 M eV

5 events

Ex= 35 M eV1 events

249 48Bk + Ca

F 1 F 2

2

1

3113

Bh

286

274

270

6

5 M t278

Rg282

4

115

117

290

294

Db

9.95(40) M eV 20 s+94-9

0.9 m in+4.2-0.4

0.51 s+2.5-0.23

7.7 s+37-3.5

23 h+110-10

16 m s+75-8

78 m s+370

-36

E <7 .9 M eV

9.63(10) M eV

8.80(10) M eV

9.00(10) M eV

9.55(19) M eV

10.81(10) M eV

E +E =196 (5 ) M eVF1 F2

117297

E < 9 .4 M eV, T > 100 s

F 1 F 2

10.31(9) M eV 2

1

3113

285

Rg281

5.5 s+5.0-1.8

26 s+25-8

0.22 s+ 0 . 2 6- 0 . 0 8

14 m s+11-4

E +E =195 (5 ) M eVF1 F2

115

117

289

293

9.74(8) M eV 9.48(11) M eV

11.03(8) M eV

117297

10.23 MeV

31 ms

5.1 min

8.8 s

5.6 s

11 s

0.7 s

9.56 MeV

8.43 MeV

9.43 MeV

9.14 MeV

11.00 MeV

10.48 MeV

7 ms

0.15 s

0.84 s

11.26 MeV

9.96 MeV

4n

DecaychainsDecaychains

aa

108/275

110/279

106/271

112/284112/282

114/286 114/287

10.02

114/288

9.94

116/290

115/288115/287

113/284113/283113/282

111/280

109/276109/274

107/272107/270

111/279111/2 87

109/2 57

116/291

10.84 10.74

112/285

110/281

114/289

9.82

9.159.54

9.30

8.54

10.00

10.4610.59

10.1210.63

9.75

9.719.76

9.028.93

10.3710.69

10.33

105/268105/266

7 ms

3 ms2 87 ms

18 ms

0. s173 ms

0.19 s

0.17 s4.2 ms

0.72 s0.45 s

9.8 s61 s

1.2 d0.37 h

9.7 ms

0.48 s

0. s10.8 ms

3 6. s

0.2 s

1.9 min

11.1 s

29 s

0.48 s 0. s8 2.6 s0.13 s

10.19

112/2833.8 s

116/292

10.66

18 ms

107/2 17

116/293

61 ms

0.9 ms

118/294

11.65

105/267

1.2 h

10.54

9.70

104/267

1.3 h

0.2 s

Sg/ 266

Hs/27010 s

9.08

48 nuclides

T1/2= 320d

249Bk +48Ca

Collaboration: FLNR (Dubna) – ORNL (Oak-Ridge) –LLNL (Livermore) – IAR (Dmitrovgrad)-Vanderbilt University (Nashville)

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-6

-8

-4

-2

0

2

4

6

8

10

12

14

16

18

Z=112

112

114110

106

106108

104

102

100

98 N 6=1 2

N 5=1 2N 84=1

140 145 150 155 160 165 170 175 180 185N eu tron num ber

Log

T

(s)

SF

TheorySpontaneous fission half-livesSpontaneous fission half-lives

Actinides

Trans-actinides

Superheavy nuclei

111

105

100

110

120

160 170 180 190Neutron num ber N

Pro

ton

nu

mbe

r Z

1 2 3 4 5 6 7 8

Bf (MeV)

P. Moller et al., Phys. Rev., C79, 064304 (2009)

▼▼▼

▼

▼

▼

Z=117

Z=112▼

“critical” zones

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Spontaneousfission

α-decay

blue – cold fusion

black – Act. + 48Cared – 249Bk. + 48Ca

117

Theory & ExperimentTheory & Experiment

deformed sphericalPR

ELIM

INA

RY

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5%

117

117

160 160165

N=1 26 N=1 26

165170 170neutron num ber neutron num ber

Alp

ha-

dec

ay e

ner

gy

Q (

MeV

)

Alp

ha

-de

cay

ha

lf-l

ife

(s)

175 175180 180

12 5.

12 0.

1 51.

1 01.

1 00.

1 50.

9.5

9.0

8.510

-4

10-3

10-2

10-1

100

101

102

103

115

115

113

113

Z=111

111Z=111

Alpha decay energy Half-lives

blue – cold fusion

black – Act.+48Ca

red – 249Bk+48Ca

PRELIMINARY

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100

0.1

1.0

10

x1/10

100

1000

105Atom ic number

xn -

cro

ss s

ectio

n (

pb)

Hs

No

SHE

110 115 120

249Bk+48Ca226Ra+48Ca

208Pb+48Ca Ex≈ 40 MeV

Cross sectionsCross sections

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Experiment is still going on…

Subsequent research

Chemistry of Element 113

more and more inert?

H

1

Li

3

Be

4

Na

11

M g

12

K

19

Ca

20

Sc

21

104

Ti

22

V

23

Cr

24

M n

25

Fe

26

Co

27

Ni

28

Cu

29

Zn

30

1

2

3 4 6 7 8 9 10 11 12

13 14 15 16 17

18

1

2

3

4

5

6

He

B

Al Si P S

ONC F

Cl Ar

Ne

7105 106 107 108 109 110 111 112 113 115114 116 117 118

72 74 75 76 77 78 79 80 81 82 83 84 85 8655 56

87 88

37 38 39 40 42 43 44 45 46 47 48 49 50 51 52 53 54

31 32 33 34 35 36

Rf Db Sg Bh Hs M t

Rb Sr Y Zr M oNb Tc Ru Rh Pd Ag Cd In Sn Sb Tc I Xe

Cs Ba Hf WTa Re O s Ir Pt Au Hg Ti Pb Bi Po At Rn

Fr Ra

G a G e As Se Br Kr

Dar

ms-

tad

tiu

m

Ds Rg

5

73

41

?

Periodic Table of ElementsPeriodic Table of Elements

114 115

115

117

249Bk(320d) + 48Ca

243Am(7370y) + 48Ca

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113 113 113 113

115 115 115

117

278 282 283 284

287 288 289

293

113285

Isotopes of Element 113

209Bi + 70Zn

RIKEN (Tokyo)

0.24ms

σ =0.03pb

243Am + 48Ca

237Np + 48Ca

249Bk + 48Ca

T1/2JINR (Dubna) - - LLNL (Livermore) - - ORNL (Oak-Ridge) collaboration

0.07s 0.5s 5.5s

σ =4.2pb

σ =1.3pb

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Adsorption enthalpy of elements 112 through 115 (in kJ/mol)

Hg Tl Pb Bi

Teflon 13.2 19.7 13.7 15.2;12.5

ice 26.27 - 26.3

quartz 422a

26b

1162d

1145d

202e

gold 982 c 2405d 235f (305) estimate

112 113 114 115

Teflon 13.3 14.0 10.4 14.1; 12.2

ice 26.4 - 20.20

quartz 43.4 ? (21.0ideal)

gold 62 52+4

-3g

158.6 99.4 (223.6) estim

Red – experiment:a) Soverna, PSI Report 2004, p. 8;b) A. Yakushev, et al.c) S. Soverna et al. Radiochim. Acta, 93, 1-5 (2005).d) S. König, et al. PSI Annual Report 2007?e) F. Haennsler, et al PSI Annual Report 2004, p. 9.f) -207 21 (Haenssler); -222 8 (Fan); 242 on the picture; F. Haenssler et al., PSI AR, 2005, p. 3.g) R. Eichler et al. Angew. Chem. Int. Ed. 47, 1-6 (2008).h) R. Eichler and M. Schädel, J. Phys. Chem. B 106, 5413-20 (2002).k) R. Eichler, private commun.

Black- calculations.Blue – estimates from the calculations for the dimerwith respect to the exp. for the homolog.Green ? – with respect to the exp. for Rn based on the calculations

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Reaction:

249Bk(48Ca,4n)293117→α→293115 →α→289113[5.5s] →α→ 283Rg[26s]

Au

SiO2

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Thanks for your attention

107th session of the jinr scientific council 18–19 february 2010, dubna yuri oganessian flnr...

Documents

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