SHE in JINR
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SHE in JINR. Yuri Oganessian Flerov Laboratory of Nuclear Reactions Joint Institute for Nuclear Research. 109 th Session of the JINR Scientific Council Feb.17-18, 2010, Dubna. Synthesis of SHE with 48 Ca-induced reactions 10 years. Decay chains.

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Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

SHE in JINR

Yuri Oganessian

Flerov Laboratory of Nuclear Reactions

Joint Institute for Nuclear Research

109thSession of the JINR Scientific Council Feb.17-18, 2010, Dubna.


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Synthesis of SHE

with 48Ca-induced

reactions

10 years


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Decay

chains

Decay

chains

Talk at the Meeting of RAS, Nov.,2000

244Pu, 248Cm +48Ca

Z=116

0.06 s

2.5 s

114

114

0.5 min

112

0.7 ms

11s

170μs

110

184


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Confirmations2007-2010

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

6 new superheavy

elements

118

117

116

2010

115

114

Yu. Oganessian 2010

113

112

249Bk +48Ca

111

T1/2= 320d

110

109

48 new

isotopes

108

107

106

105

104

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Total evaporation residues cross sections

(pb)

100000

10000

Cross sections

Cross sections

1000

100

SHE

10

48Ca-induced

reactions

1

Cold fusion

factor ~300

0.1

0.01

100

105

110

115

120

Atomic number


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

TechnicalAchievements

&Collaborations


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Search for Element 116 in248Cm +48Ca reaction

Search for Element 116 in248Cm +48Ca reaction

“in flight”

separation

chemical

separation

GSI, Darmstadt, Germany*

LBL, UC Berkeley, CA

Univ. of Mainz, Germany

LANL, Los Alamos, NM

EIR, Würenlingen, Switzerland

1985

292116

293116

FLNR, Dubna

LLNL, Livermore, CA

2000


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

TARGETS

The neutron-rich isotopes

of the Actinides was produced

at ORNL (USA) by irradiation:

of Cm and Am targets in each

campaine for approximately

250 days

by thermal-neutron flux of

2.5  1015 n/cm²·s

in the HFIR

(High Flux Isotope Reactor). 

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

BEAMS

Beam dose: 2.4·1019

0.3%


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

DETECTORS

Dubna Gas-Filled Recoil Separator

Dubna Gas-Filled Recoil Separator

From the characteristics

of the DGFRS, it follows

that with a 48Са-beam dose of

3∙1017

realized for 1 day

the observation of

one decay event

corresponds to the

production cross section of

about 10 pb.

beam

48Ca

target


Decay properties of she expected obtained

Decay Properties of SHE:expected & obtained


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Alpha-decay

Alpha-decay


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Spontaneous fission half-lives

Spontaneous fission half-lives

Actinides

Trans-actinides

Superheavy nuclei

48Ca-induced reactions


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

  • With Z >40% larger than that of Bi, the heaviest stable element,

  • we see an impressive extension in nuclear survival.

  • Although SHN are at the limits of Coulomb stability,

  • shell stabilization lowers ground-state energy,

  • creates a fission barrier,

  • and thereby enables SHN to exist.

  • .

The fundamentals of the modern theory

concerning the mass limits of nuclear matter

have obtained experimental verification

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Consequences


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Electronic structure

of SHE-atoms

Nuclear theory

Atomic Physics

Search for

new shells

Chemical properties of the SHE

Chemistry

Nuclear structure and decay properties of the SHN

Nuclear Physics

protons →

A=294

Search for SHE

in Nature

Astrophysics

neutrons →

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Decays & Spectroscopy

of Super heavy Nuclei


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

6 new superheavy

elements

118

117

116

protons

115

114

Previously known

nuclei from cold

Fusion reactions

113

112

111

110

It is questionable that

“filling in empty spaces”

would give us significant

information about

nuclear structure of SHE

109

48 new

isotopes

108

107

106

105

104

neutrons


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Cross sections

Cross sections

σxn ~ (Γn / Γf)x;

х –number of evaporated neutrons

(Γn / Γf) ~ exp(Bf – Bn) / T

Bf = BfLD + ΔEShell

0

SHN

Hot fusion

Ex=45-50 MeV


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Spontaneous fission

of heavy and super heavy

elements

118

117

116

115

114

Z=110-114

N=170-172

TSF= 0.001-10s

113

112

111

110

109

108

107

Z=104-106 very neutron-rich nuclei

N=162-166

T1/2 = 104-105s

106

105

104


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Z1 ≈ Z2 = 50-54

N1 = N2 = 82

rel. units

Yield (rel. units)

QF = 268 MeV

E. K. Hulet, et al.,

P.R. C40, 770 (1989)


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

“on line”

“gas catcher”

N=162

Act. + 48Ca

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

ε=0.5 mm·mrad

Experimental l technique

ΔE=0.5 eV

FLNR /ANL

beam

48Ca

target


Superheavy atoms

Superheavy Atoms

Chemistry of the SHE


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

(finite size)

Zmax≈173

Heaviest atoms in QED

(point charge)

SHE

Hg

Zmax=1/α=137

where α is fine-structure constant


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

rmax- principal maximum

of the wave function

of the outermost orbital

Zmax


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

FLNR / PSI

chemical compound (Au·Hg)

(Au·112)

R. Eichler et al., Nature 447 (2007) 72


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

SHE ion charge exchange in the gas-target

Beam of SHE

with variable energy

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Theoretical Models

Nuclear forces

Macro – Microscopic Model (MMM)

Hartry – Fock – Bogolubov (HFB)

Relativistic Mean Field (RMF)


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

251Cf

HFB

+50Ti

+48Ca

MMM

MMM

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Strategy


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Gain factors for production of Super-heavy nuclei

2.5pμA

Current experiments

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Feb.17, 2011, 1:59 AM. From ORNL, USA

Dear Yuri

We have received authorization from DOE for production of Bk-249

for the upcoming experiments at Dubna and at GSI.

Your letter and your trip to DOE were very helpful in securing

approval. Thank you for your support.

We anticipate that the material will be ready for shipment

later this year in the December-January timeframe.

A more detailed schedule will be forthcoming.

We look forward to working with you on these exciting experiments.

With best regards,

Jim


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

Thank you


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

2011 - 2017

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

2011 - 2016


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

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

spherical

~8pb

Z=117

Z=112

deformed

≤0.6pb

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

more and more inert?

Periodic Table of Elements

Periodic Table of Elements

Yu. Oganessian. Colloquium at MIT, Feb.10, 2011


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

249Bk

237Np ,

243Am ,

From reactions: 48Ca +

SF

SF

Z=104

N=162 164 166


Yuri oganessian flerov laboratory of nuclear reactions joint institute for nuclear research

120

120

120

114

114

114

120

120

120

114

114

114

Z=114 / N=184

251Cf + 48Ca → 296(118) +3n→

251Cf + 50Ti → 298(120) +3n→

M. Bender et al., PRC60 & PLB515

Yu. Oganessian “SHE in JINR” 109-th Session of the SC of JINR, Feb. 17-18, 2011, Dubna


Opportunities for future research

Opportunities for future research

Island of

Stability

1µs

1s

1h

1My

1y

120

Shoal

110

Peninsula

Protonnumber

100

Sea of Instability

90

Continent

80

70

150

170

100

110

130

140

190

120

160

180

Neutron number

Oganessian, ENAM (2008)

New targets

New beams

New elements

New isotopes

Higher neutron numbers

New physics

New chemistry


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