Thediscoveryofelement113atRIKEN�

KoujiMorimotoRIKEN,NishinaCenterforAcceleratorBasedScience;

� 26thInterna+onalNuclearPhysicsConference(INPC2016)

�

Contentsofmytalk�<Namingrightsofelement113Proposednameandsymbolforelement113

<Thehistoryofexperimentsaimingforelement113Theexperimentsstatedin2001andfinishedin2012

Alltheresultsrelatedtothe278113areshowninFmeseries

<FutureplansDevelopmentofnewseparatorGARIS-IIUpgradeplanofLINACaccelerator�

IUPACannounceddiscoveriesofelement113,115,117and118

Prof.KosukeMorita�

Atlast,IUPACannounceddiscoveriesofelement113,115,117and118

Element113TheRIKENcollaboraFonteaminJAPANhavefulfilledthecriteriaforelementZ=113andwillbeinvitedtoproposeapermanentnameandsymbol.

Nihonium“Nh”�Weproposed"nihonium"forthenameand"Nh"forthesymbol.

Therearetwowaystosay"Japan"inJapanese:"Nihon"and"Nippon".Bothliterallymean“theLandofRisingSun”andarewidelyusedofficially.Wehave

thereforedecidedon"nihon",andbyadding"-ium.Thesymbolwillbe"Nh"as

anabbrevia+onfor"nihonium".�

NamingmeeFng�

Photo.togetherwithNishina-sensei�

Thehistoryofexperimentsfor278113�

Thehistoryofexperimentsfor278113�2001:GARIS+RILACbecamereadytostart.MoFvaFonwastoproduceanewelementwhichisconnectedtoknownnuclei.ThenwestartedfromfollowingreproducFonsofGSIDATA.208Pb+58Feà208Hs,208Pb+64Nià271Ds,209Bi+64Nià272RgSucceededwell!2003:Z=113Start(AlmostthesameFme,GSI‘s113exp.started.)209Bi(70Zn,n)2781131steventwasobservedonJul.2004.2ndeventwasobservedonApr.2005.

2009:248Cm(23Na,5n)266Bh(266Bhisgreatgranddaughterof278113)TheresultsreinforcedtheinformaFonofknown(anchor)isotopesof113decaychains.Andalsoestablishedthecross-bombardment.2010(2004):205Tl(70Zn,n)274Rg(274Rgisdaughterof278113)NoeventwasobservedbecauseTltargetcouldn’tstandagainstofintensebeam.2012Aug.:3rdeventof278113wasobserved.Theobserveddecaychainconsistof6alphaandconnectedto254Md.2012Oct.:Z=113Finish2015Dec.IUPACannouncedtheverificaFonofthediscoveriesofelement113.

Our research region

NeutronnumberN

Proton

num

berZ

10410210098

106

108

110

ProducedatRIKEN

Ac+nidetargets

(U,Cm…)

SHEPb,BiFe–Zn

n

nSHE

48Caetc.

“Coldfusion”

“Hotfusion”

Inthis12years,westudiedSHEusingcoldfusionreac+on.�

Cn�

Lv�

Fl�

209Bi+70Znà278113+n�

TheirradiaFonwasstartedinSep.2003.

1steventwasobservedonJul.2004.

(J.Phys.Soc.Jpn.73(2004)2593.)

2ndeventwasobservedonApr.2005.

(J.Phys.Soc.Jpn.76(2007)045001.)�

0 1 2(m)

D1Q1Q2 D2

Heinlet�

DifferenFalpunping�

RotaFngBitargets�

BeamIntensitymonitor�

Primarybeam�

Beamstopper=Ta>�

EvaporaFonResidues�

GARIS(Gas-filledrecoilionseparator)

Hegas�

Experimentalsetupfor278113�

ER� TOF detectors�

Si detector�BOX�

The 113 experiment was performed by using GARIS and Si detector box with ToF�

Masses of Beams & Targets Audi & Wapstra, Nucl. Phys A565, 1 (1993) Masses of Compound Nuclei Myers & Swiatecki, Nucl. Phys. A601, 141 (1996)

Threshold of fission after 1n emission calculated by following mass tables.

5 10 15 20 Ex of C.N. (MeV)

20

10

4

2

1

0.5

0.3 0.2 0.1

σ (p

b)

272Ds

273Rg

278Cn

279113

We studied the systematics of excitation function for the 272Ds and 273Rg. The peak energies exists around a threshold of fission after 1n emission calculated by following mass tables. The beam energy was determined by this systematics.

DeterminaFonofincidentEnergy

278113

274Rg

270Mt

266Bh

CN

11.68MeV(PSD)

344;μs30.49mm

11.15MeV

6.149+5.003(PSD+SSD)

9.260ms

30.40mm

10.03MeV

1.136+8.894(PSD+SSD)

7.163ms

29.79mm

9.08MeV(PSD)

2.469s

30.91mm

36.75MeV

TOF44.61ns

30.33mm

23-July-200418:55(JST)α

α

α

α

262Db

204.05MeV(PSD)

40.9s

30.25mm

278113

274Rg

270Mt

266Bh

CN

11.52MeV(PSD)

4.93;ms

30.16mm

0.88+10.43=11.31MeV

(PSD+SSD)

34.3ms

29.61mm

2.32MeV(escape)

1.63s

29.45mm

9.77MeV(PSD)

1.31s

29.65mm

36.47MeV

TOF45.69ns

30.08mm

2-April-20052:18(JST)

Thefirsttwodecaychain

α

α

α

α

262Db

192.32MeV(PSD)

0.787s

30.47mm

2ndchain

s.f.s.f.

1stchain

P.A.Wilketal.,PRL85,2697(2000)Ref.1249Bk(22Ne,5n)266BhZ.Qinetal.,Nucl.Phys.Rev.23,400(2006)Ref.2243Bk(26Mg,3n)266Bh

Dr.Morita�

TableofIsotopes

T1/234±4sec

S.F.A33%:αA64%

262Db:Alphadecay

wasawaited.But…�

Asshownnow,twodecaychainsof278113wereobservedbyusing209Bi+70Zn.

BothChainconsistoffouralphadecaysandendedbyspontaneousfissionof262Db.

266Bhand262Db,thedaughterproductsof278113,areknownnuclei,reportsexsists.Thereportsandthedaughterproductsof

278113wereconsistent.Thereforeoneceweclaimedthatthe

278113wereclearlydeterminedwithZandA.

;��;���MoFvaFonofthisworkwastoreinforcetheinformaFonofknown(anchor)isotopesof113decaychain.

ThestaFsFcsofthereportof266Bhwerenotenough.1events:(249Bk+22Neà266Bh),LBNL,P.A.Wilketal.,Phys.Rev.Lel.85,(2000);4events:(243Am+26Mgà266Bh),IMP,Z.Qinetal.,Nucl.Phys.Rev.23(2006)(ChinesejournalinEnglish)

However�

248Cm + 23Na à 266Bh + 5n�

K. Morita, K. Morimoto, D. Kaji, et al.: J. Phys. Soc. Jap. 78(2009) 064201�

0 1 2(m)

D1Q1Q2 D2

Heinlet�

DifferenFalpunping�

RotaFngCmtargets�

BeamIntensitymonitor�

Primarybeam�

Beamstopper=Ta>�

EvaporaFonResidues�

GARIS(Gas-filledrecoilionseparator)

Hegas�

ExperimentalsetupfortheCm+NaàBh�

SSDbox

PSD

ions

αα

TheBhexperimentwasperformedbyusingGARISandSidetectorboxwithoutToFdetectors,becauserecoilvelocityistoolowtopassingthroughtheToFdetectors.�

BeamOn/Off,3s/3s�

278113

274Rg

270Mt

266Bh

CN

11.68MeV(PSD)

344;μs30.49mm

11.15MeV

6.149+5.003(PSD+SSD)

9.260ms

30.40mm

10.03MeV

1.136+8.894(PSD+SSD)

7.163ms

29.79mm

9.08MeV(PSD)

2.469s

30.91mm

36.75MeV

TOF44.61ns

30.33mm

23-July-200418:55(JST)α

α

α

α

262Db

204.05MeV(PSD)

40.9s

30.25mm

278113

274Rg

270Mt

266Bh

CN

11.52MeV(PSD)

4.93;ms

30.16mm

0.88+10.43=11.31MeV

(PSD+SSD)

34.3ms

29.61mm

2.32MeV(escape)

1.63s

29.45mm

9.77MeV(PSD)

1.31s

29.65mm

36.47MeV

TOF45.69ns

30.08mm

2-April-20052:18(JST)

209Bi+70Zn→278113+n

α

α

α

α

262Db

192.32MeV(PSD)

0.787s

30.47mm

2ndchain

s.f.s.f.

1stchain

P.A.Wilketal.,PRL85,2697(2000)Ref.1249Bk(22Ne,5n)266BhZ.Qinetal.,Nucl.Phys.Rev.23,400(2006)Ref.2243Bk(26Mg,3n)266Bh

TableofIsotopes

T1/234±4sec

S.P.A33%:αA64%

248Cm+23Na�

Exampleoftheobserveddecaychainsof266Bh�

E=9.12 MeV (PSD+SSD) τ=1.19 s P=46.0 mm

266Bh

262Db

α

258Lr

α

αE=8.74MeV (PSD+SSD) τ=13.7 s P=42.5 mm

E=8.60MeV (PSD) τ=9.4 s P=49.6 mm

18th-FEB-2009 (main.180) Strip=#11 266Bh

262Db

E=9.09 MeV (PSD+SSD) τ=4.23 s P=26.3 mm

E=157.9 MeV (PSD) τ=5.3 s P=26.9 mm

α

SF

16th-FEB-2009 (main.178) Strip=#9

Fissionbranchof262Dbwasclearlyobserved.

11chains� 3chains�

254Md

Thesefiguresshowstheexampleoftheobserveddecaychainsof266

Bh

Leosidechainconsistsof3alphadecays,from266

Bhto254

Md.

RightsidechainwasendedbySFof262

Db.Itissamedecaypalern

asfirsttwo278

113decaychains.

�

14decaychainsfrom266Bhwereobservedintotal.�

Now,the278113decaychainsclearlyconnectedtotheknown266Bhand262Db!�

205Tl + 70Zn à 274Rg + n �

Period1: 2004/11/22A�2004/12/15Period2: 2010/03/12A�2010/03/29

�

274Rgisdaughterof278113.�

InordertomakefurtherconfirmaFon,wetriedtoproduce274Rgby205Tl(70Zn,n)274RgreacFon,twoFmes.�

278113

274Rg

270Mt

266Bh

CN

11.68MeV(PSD)

344;μs30.49mm

11.15MeV

6.149+5.003(PSD+SSD)

9.260ms

30.40mm

10.03MeV

1.136+8.894(PSD+SSD)

7.163ms

29.79mm

9.08MeV(PSD)

2.469s

30.91mm

36.75MeV

TOF44.61ns

30.33mm

23-July-200418:55(JST)α

α

α

α

262Db

204.05MeV(PSD)

40.9s

30.25mm

278113

274Rg

270Mt

266Bh

CN

11.52MeV(PSD)

4.93;ms

30.16mm

0.88+10.43=11.31MeV

(PSD+SSD)

34.3ms

29.61mm

2.32MeV(escape)

1.63s

29.45mm

9.77MeV(PSD)

1.31s

29.65mm

36.47MeV

TOF45.69ns

30.08mm

2-April-20052:18(JST)

α

α

α

α

262Db

192.32MeV(PSD)

0.787s

30.47mm

2ndchain

s.f.s.f.

1stchain

P.A.Wilketal.,PRL85,2697(2000)Ref.1249Bk(22Ne,5n)266BhZ.Qinetal.,Nucl.Phys.Rev.23,400(2006)Ref.2243Bk(26Mg,3n)266Bh

TableofIsotopes

T1/234±4sec

S.P.A33%:αA64%

205Tl+70Zn�

Period1: 2004/11/22A�2004/12/15(30cmΦtarget)

Targetdeteriora+onoccur(thicknessbecameun-uniformimediately)

-->TltargetisweekerthanBi

Period2: 2010/03/12A�2010/03/29(60cmΦtarget)

Weapplied60cmΦwheel,butnot efficiently improved BeamEnergy;;��� 341MeVattargethalfdepthTotalDose7.5x1018TargetThickness 450μg/cm2numberofevents 0CrosssecFon0.23pb(upperlimit)IrradiaFonFme 39DaysBeamIntensity A0.4pμA

Summaryof205Tl(70Zn,n)274Rg

Melting point Tl: 302.5 9 Bi: 271.5 9 Pb: 327.5 9

MelFngpointofTlishigherthanBi,butTltargetwasweakerthanBitarget.ThereasonissFllquesFonmark.

àGaveup!�

Newlydeveloped60cmtarget�

60cm�

In2009wedevelopeda60cmdiameterrota+ng

targetsystemforGARIS-I.Itwassucceededtoworkinthecondi+onof2000rpmandusedintheexperimentofZn+Tl.(Period2:2010)�

Target wheel�

Target Camber�But the Tl target problem was not efficiently improved and we gave up the production of 274Rg. �

Atlastthe3rdeventcame!�

WeconFnuedtheirradiaFonabout450daysfrom2ndevent.

Thenagain,

weconFnuedBi+Znà113experiment.�

Aug. 12, 2012

278113

274Rg

270Mt

266Bh

CN

11.82 MeV 667 µs

10.65 MeV 9.97 ms

10.26 MeV 444 ms

9.39 MeV 5.26 s

262Db

8.63 MeV 126 s

258Lr

8.66 MeV 3.78 s

α1

α2

α3

α4

α5

α6

254Md

Newlyobserved3rdchainof278113�

Thechainwaslong-awaitedlongchain!�

K.Moritaetal.,J.Phys.Soc.Jpn.81(2012)103201

Previoustwoeventswereendedbyspontaneousfissionof262Db.Thiseventwasconsistof6alphadecaysandconnectedto254Md.Thefiohandsixthdecaysarefullyconsistentwiththesequen+aldecaysof

262Dband258LrinbothdecayenergiesanddecayFmes.

TheconnecFontotheknownisotopeisstronglyreinforced.

113�

112� 277Cn�

111� 272Rg�

110� 269Ds�270Ds�271Ds� 273

Ds�

109� 266Mt� 268

Mt�

108� 263Hs� 265

Hs�266Hs�267Hs� 269Hs�270Hs�271Hs�

107� 261Bh�262Bh� 264

Bh� 266Bh�267Bh�

106� 258Sg�259Sg� 261

Sg� 263Sg�

105� 259Db�260Db�

104� 256Rf� 260

Rf� 261Rf� 262

Rf�

103� 255Lr� 257

Lr� 258Lr� 259

Lr� 260Lr� 261

Lr� 262Lr�

102� 256No� 258

No� 260No� 262

No�

101�253Md�254Md� 259Md�260Md�

100� 252Fm� 254

Fm�255Fm� 257Fm�258Fm�259Fm�

99� 251Es� 253

Es� 256Es� 257

Es�

98� 250Cf� 251

Cf� 252Cf� 253

Cf� 254Cf� 255

Cf� 256Cf�

262Db�

264Hs�

265Sg�266Sg�262

Sg�260Sg�

263Db�

263Rf�

261Db�257

Db�258Db�

257Rf�258Rf� 259

Rf�

255Md�256Md�257Md�258Md�

259No�

256Fm�253

Fm�

255No�

256Lr�

257No�254

No�

252Es� 255

Es�254ES�

278113�

274Rg�

270Mt�

266Bh�

262Db�

α�

α�

α�

α�

���

278113�

274Rg�

270Mt�

266Bh�

262Db�

α�

α�

α�

α�

258Lr�

α�

254Md�

α�

254Fm�

α�

250Cf�

1steventJul.232004�2

ndeventApr.22005�3rdeventAug.122012�

Knownnuclei�

209Bi+70Znàn�

���

Observedthreedecaychainsonthenuclearchart�

10µs 1ms 0.1s 10s 1000s

278113τ=2.0ms

274Rgτ=18ms

270Mtτ=0.69s

266Bhτ=3.0s

262Dbτ=56s

T_decay

2ndevent

N=165

N=163

N=161

N=159

N=1571stevent

3rdevent

Eα(MeV)

3decaychainsareconsideredtobeidenFcal.�

DecayFmedistribuFonwithlogarithmicscale.�278

113�

274Rg�

270Mt�

266Bh�

262Db�

DataareconsistentwithidenFcaldecaycurve.ThreedecaychainsareconsideredtobeidenFcal.

Summaryoftheresultsrelatedto278113�

278113

274Rg

270Mt

266Bh

279113

α

262Db

267Bh

268Bh

269Bh270Bh

271Bh

258Lr

onenevapora+on�

fivenevapora+on�

decaysobservedin278113synthesis�

decaysobservedin266Bhsynthesis�

209Bi+

70Zn:�279113*�

248Cm+

23Na:�271Bh*�8.82,9.05-9.23MeV

8.40–8.74MeV(79%)�

S.F.(21%)�

8.57–8.80MeV�

T1/2:24.0+14-7s�

T1/2:4.0+2.2-2.0s�

9.08,9.77,9.39MeV�

SF40.9,SF0.787s,alpha8.63MeV126s�α

α

α

α

α

8.66�MeV3.78s�

254Md

278113�

274Rg�

270Mt�

266Bh�

262Db�

278113�

274Rg�

270Mt�

266Bh�

262Db�

278113�

274Rg�

270Mt�

266Bh�

262Db�

258Lr�

254Md�

α1�

α2�

α3�

α4�

S. F.�

α1�

α2�

α3�

α4�

S. F.�

α1�

α2�

α3�

α4�

α5�

α6�

Apr. 2, 2005 (2nd)�

Aug. 12, 2012 (3rd)�

11.68 MeV 0.344 ms�

11.15 MeV 9.26 ms�

10.03 MeV 7.16 ms�

9.08 MeV 2.47 s�

204 MeV 40.9 s�

11.52 MeV 4.93 ms�

11.31 MeV 34.3 ms�

2.32 MeV (escape) 1.63 s�

9.77 MeV 1.31 s�

192 MeV 0.787 s�

11.82 MeV 0.667 ms�

10.65 MeV 9.97 ms�

10.26 MeV 444 ms�

9.39 MeV 5.26 s�

8.63 MeV 126 s�

8.66 MeV 3.78 s�

Jul. 23, 2004 (1st)�

Thehistoryofexperimentsfor278113�2001:GARIS+RILACbecamereadytostart.MoFvaFonwastoproduceanewelementwhichisconnectedtoknownnuclei.ThenwestartedfromfollowingreproducFonsofGSIDATA.208Pb+58Feà208Hs,208Pb+64Nià271Ds,209Bi+64Nià272RgSucceededwell!2003:Z=113Start(AlmostthesameFme,GSI‘s113exp.started.)209Bi(70Zn,n)2781131steventwasobservedonJul.2004.2ndeventwasobservedonApr.2005.

2009:248Cm(23Na,5n)266Bh(266Bhisgreatgranddaughterof278113)TheresultsreinforcedtheinformaFonofknown(anchor)isotopesof113decaychains.Andalsoestablishedthecross-bombardment.2010(2004):205Tl(70Zn,n)274Rg(274Rgisdaughterof278113)NoeventwasobservedbecauseTltargetcouldn’tstandagainstofintensebeam.2012Aug.:3rdeventof278113wasobserved.Theobserveddecaychainconsistof6alphaandconnectedto254Md.2012Oct.:Z=113Finish2015Dec.IUPACannouncedtheverificaFonofthediscoveriesofelement113.

Beam Time net irrad. t. dose/sum Cross section events Year Period (days) [×1019] (fb) 2003 9/5 - 12/29 57.9 1.24/1.24 75 (upper) 0 2004 7/8 - 8/2 21.9 0.51/1.75 55 1 2005 1/20 - 1/23 3.0 0.07/1.82 52 0 2005 3/20 - 4/22 27.1 0.71/2.53 75 1 2005 5/19 - 5/21 2.0 0.05/2.58 74 0 2005 8/7 - 8/25 16.1 0.45/3.03 63 0 2005 9/7 - 10/20 39.0 1.17/4.20 45 0 2005 11/25 - 12/15 19.5 0.63/4.83 39 0 2006 3/14 - 5/15 54.2 1.37/6.20 31 0 2008 1/9 - 3/31 70.9 2.28/8.48 23 0 2010 9/7 - 10/18 30.9 0.52/9.00 21 0 2011 1/22 - 5/22 89.8 2.01/11.01 17 0 2011 12/2 - 12/19 14.4 0.33/11.34 17 0 2012 1/15 - 2/9 25.0 0.56/11.90 16 0 2012 3/13 - 4/17 33.7 0.79/12.69 15 0 2012 6/12 - 7/2 15.7 0.25/12.94 15 0 2012 7/14 - 10/1 55.0 0.97/13.91 22 1 Total 576 13.91 22 3

70Zn + 209Bi à 278113 Beam Time Table

576/3=192,

1eventper192days!�

Nihonium“Nh”�Weproposed"nihonium"forthenameand"Nh"forthesymbol.

Therearetwowaystosay"Japan"inJapanese:"Nihon"and"Nippon".Bothliterallymean“theLandofRisingSun”andarewidelyusedofficially.Wehave

thereforedecidedon"nihon",andbyadding"-ium",thenameforthenew

elementwithatomicnumber113willbe"nihonium".Thesymbolwillbe"Nh"

asanabbrevia+onfor"nihonium".�

NamingmeeFng�

TogetherwithNishina-sensei�

WhyRIKEN?WhynotDubna?�

DubnaandUSAcollabora+onteam

a@soclaimedthediscoveryofelement113

Rf�

Db�

Sg�

Bh�

Hs�

Mt�

Ds�

Rg�

Cn�

113�

Fl�

115�

Lv�

117�

118�

119�

120�

Neutronnumber�

Protonnumber�

156�157�158�159�160�161�162�163�164�165�166�167�168�169�170�171�172�173�174�175�176�177�

104�

105�

106�

107�

108�

109�

110�

111�

112�

113�

114�

115�

116�

117�

118�

119�

120�

274�

270�

278�

70Zn+

209Bi�

266�

262�

AnchorandcrossbombardmentEstablishedin20093rddecaychain2012�

22Ne+

249Bk,

23Na+

248Cm�

19F+

248Cm�

48Ca+

243Am�

283�

279�

287�

275�

271�

267�

284�

280�

288�

276�

272�

268�

282�

278�

274�

270�

266�

48Ca+

237Np�

48Ca+

243Am�

290�

286�

294�

282�

278�

274�

293�

281�

277�

285�

289�

48Ca+

249Bk�

Crossbombardmentestablishedin2013

Z=113�

Z=115�

Z=117�

Status�

(oddZ)�

Dubna�

RIKEN�

GSI�

Confirmedbyotherlabo.establishedin2013

Confirmedbyotherlabo.establishedin2014

RIKENteamfulfilledthecriteria,justbeforeDubnaandUSAteam

Futureplan�

100 105 110 115 12010

-6

10-5

10-4

10-3

10-2

10-1

100

101

102

103

104

105

Atomicnumber

Crosssec+on[pb]

Coldfusion

HotfusionDubna

40Ar~

70Zn+

208Pb,

209Bi

13C~

26Mg+

248Cm

48Ca+

238U~

249Cf

ColdfusionàHotfusion�FurthernewelementsearchusingcoldfusionishopelessbecauseofitssmallproducFoncross-secFon.�

Z=113(coldfusion)

22{,1event/200day�

msrmradmrad

2012055

≈ΔΩ

±=Δ

±=Δ

φ

θ

msrmradmrad

125867

≈ΔΩ

±=Δ

±=Δ

φ

θ

GARIS� GARIS?II�

Asymmetric(hotfusion)reac+onà

<SmallmomentumofERs

<recoileffectofemiledneutrons

<mul+plescaleringofERswithtargetatoms

àLargeangularacceptancerequired�

DevelopmentofGARIS-II�

GARIS-I (present GARIS) has a high transmission efficiency for symmetric reaction (higher velocity products) like a cold fusion reaction. GARIS-II was designed suitable for the asymmetric reaction like a hot fusion reaction.

Hotfusion� Coldfusion�

NewseparatorGARIS-II�

MBP

MBP

GARIS-II GARISHotlab.

Chemistryroom�

GARIS BGS RITU TASCA (HTM) DGFRS

ComparisonGARIS-IIvs.World’sworkingGFRS

Configura+on DQhQv

QhDhD Q

vDQ

hQv

Totallength[m] 4.0 4.7 5.8 3.5

Solidangle[msr] 8.8 45.0 12.2 13.1 4.3

3.5

DQhQv

DQvQh

DQhQvD

Bend.Angle[deg] 23 25+45 45+10 30 30

Transmission[%] 41* 49-59* 40* 60* 36*

Dispersion[mm/%] 19.37.5 20.0 9.7 9.0 1.0

GARIS-II

QvDQ

hQvD

5.1

18.5

30+7

70

Bρ(max)[Tm] 2.433.10 2.50 2.16 2.40 2.40

4.7

10.0

25

10.0

2.20

?

TASCA (SIM)

U�Pa�

Th�Ac�Ra�Fr�Rn�At�Po�Bi�Pb�Tl�

132� 134�138�

136�

140� 142�144�

146�

150�

120�118� 122� 124� 126� 128� 130�

Np�Pu�

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Db�Sg�

Bh�Hs�

Mt�Ds�

Rg�Cn�

164�

166�168�

170�

172�

174�

176�

Uut�Fl�Uup�

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152�

148�

156�

154�

158�

160�

162�Rf�

Bk�Cf�

Es�Fm�

Md�

Am�Cm�

GARIS-IICommissioningfinished�

48CaCOM#4(2days):DEC-2013

208Pb(

48Ca,2n)

254No

������ 37

40ArCOM#2(2days):NOV-2012

169Tm(

40Ar,4n)

205Fr

208Pb(

40Ar,3n)

245Fm

22NeCOM#3(2days):JUN-2013

197Au(

22Ne,5n)

214Ac

205Tl(

22Ne,5n)

222Pa

208Pb(

22Ne,4n)

226U

209Bi(

22Ne,4n)

227Np

232Th(

22Ne,5n)

249Fm

238U(

22Ne,5n)

255No�

U�Pa�

Th�Ac�Ra�Fr�Rn�At�Po�Bi�Pb�Tl�

132� 134�138�

136�

140� 142�144�

146�

150�

120�118� 122� 124� 126� 128� 130�

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No�Lr�

Db�Sg�

Bh�Hs�

Mt�Ds�

Rg�Cn�

164�

166�168�

170�

172�

174�

176�

Uut�Fl�Uup�

Lv�Uus�Uuo�

152�

148�

156�

154�

158�

160�

162�Rf�

Bk�Cf�

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GARIS-IICommissioningfinished�

23NaBT#5(7days):JUN-2014

197Au(

23Na,xn)

214Th[x=6]

197Au(

23Na,axn)

212,213Ra[x=3,4]

208Pb(

23Na,xn)

226,227Np[x=4,5]

206Pb(

23Na,xn)

224,225Np[x=4,5]

238U(

23Na,xn)

255,256Lr[x=5,6]

27AlBT#6(7days):JUL-2014

197Au(

27Al,xn)

220U[x=4]

197Au(

27Al,axn)

217Th[x=3]�

207Pb(

27Al,xn)

230Am[x=4]

209Bi(

27Al,xn)

232Cm[x=4]�

24MgBT#7(7days):SEP-2015

197Au(

24Mg,xn)

218,217Pa[x=3,4]

181Ta(

24Mg,xn)

201At[x=5]�

208Pb(

24Mg,xn)

228Pu[x=4]

238U(

24Mg,xn)

257Rf[x=5]�

48CaBT#8(7days):OCT-2015

208Pb(

48Ca,xn)

254No[x=2]

206Pb(

48Ca,xn)

252No[x=2]

238U(

48Ca,xn)

283Cn[x=3]�

238U(

48Ca,3n)

283Cn

2events/4.5days

(Possiblecandidates)�

������ 38

40Ar,

22Ne,

48CaGARIS-IICOM#2-4

GARIS-IIisready!�

ObserveddecaychainsThereacFon48Ca+238Uà286Cn*studiedusingGARIS-II�

39

C

N�

172MeV(=167+5)

14.4s�

ER

12.2MeV

X=4,Y=12

(DSSD-1)�

23th-OCT-2015,10:07(JST)�

2-foldfission

C

N�

α9.45±0.05MeV

5.4s�

ER

11.8MeV

X=3,Y=8

(DSSD-2)

27th-OCT-2015,01:05(JST)�

2-foldfission179MeV(=137+42)

154ms�

①�

②�

Preliminary

9.45±0.05MeV

6.9+12.6

-2.7s�

0.11+0.53

-0.05s�

J.Phys.G:Nucl.Part.Phys.34,R165(2007)�

Previouswork Thiswork

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RIKENNishinaCenter�K.Morita*,K.Morimoto,D.Kaji,H.Haba,H.Hasebe,

K.Katori,Y.Kudou,T.Ohnishi,K.Ozeki,A.Yoneda,A.Yoshida,Y.Wakabayashi

TokyoUniversityofScience

T.Sumita,K.Tanaka,J.Chiba�7�

SaitamaUniversity�T.Akiyama,R.Sakai,S.Yamaki,T.Yamaguchi�

7�

TohokuUniversity�T.Suda,H.Kikunaga,T.Shinozuka�

7�

JAEA�H.Koura,S.Mitsuoka,K.Ooe,N.Sato,

A.Toyoshima,K.Tsukada�7�

NiigataUniversity�S.Goto,M.Murakami,M.Murayama,

Y.Kanaya,H.Kudo,�7�

YITPKyotoUniversity�T.Ichikawa,�

7�

UniversityofTsukuba�A.Ozawa,K.Sueki�

7�

YamagataUniversity�Y.Fujimori,K.Mayama,T.Mashiko,S.Namai,

M.Takeyama,F.Tokanai,�7�7�

OsakaUniversity�Y.Kasamatsu,Y.Kitamoto,Y.Komori,T.Kuribayashi,

K.Matsuo,D.Saika,A.Shinohara,T.Takabe,Y.Tashiro,T.Yoshimura,E.Ideguchi�

7�

KanazawaUniversity�T.Nanri,D.Suzuki,I.Yamazaki,A.Yokoyama

KyusyuUniversity�K.Morita*,T.Tanaka,Y.Fujita�

�

Collaborators�