Research programs at RIKEN RIBF UENO, Hideki RIKEN Nishina Center - - PDF document

Research programs at RIKEN RIBF

UENO, Hideki

RIKEN Nishina Center

JCNP2015, RCNP, November 7-12, 2015

RIBF key experimental devices

ZeroDegree

• γ spectroscopy

BigRIPS

• RIB production

Rare RI Ring - mass SCRIT - e-RI collision SAMURAI - large acceptance SHARAQ - high resolution SLOWRI - slow RIBs

fRC IRC SRC RILAC2 RILAC AVF RRC

RIPS

• spin-oriented

medium-E RIBs GARIS 1

• SHE researches

CRIB

• low-E RIBs

KISS

• KEK Isotope separator

& 2

RIBF key experimental devices

ZeroDegree

• γ spectroscopy

BigRIPS

• RIB production

Rare RI Ring - mass SCRIT - e-RI collision SAMURAI - large acceptance SHARAQ - high resolution SLOWRI - slow RIBs

fRC IRC SRC RILAC2 RILAC AVF RRC

RIPS

• spin-oriented

medium-E RIBs GARIS 1

• SHE researches

CRIB

• low-E RIBs

KISS

• KEK Isotope separator

& 2

RILAC RILAC2 AVF RRC fRC IRC SRC BigRIPS RILAC RILAC2 AVF RRC fRC IRC SRC BigRIPS RILAC RILAC2 AVF RRC fRC IRC SRC BigRIPS

① Variable-energy mode (E/A = 250 ~ 345 MeV) ② Fixed-energy mode (E/A = 345 MeV) ③ AVF-injection mode (E/A ~ 250 MeV)

AX = 238U, Xe, Kr AX ≲ 18O

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

① BigRIPS (standalone mode)

High-energy branches

BigRIPS

• RIB production

σR measurements

• M. Takechi et al.,
• Phys. Lett. B707, 357 (2012) ‒ 29, 31Ne
• M. Takechi et al.,
• Phys. Rev. C 90, 061305(R) (2014) ‒ 37Mg

① Two-step PF: → Maximize A ② Disp. Match → Maximize Y of two-step PF ABeam Target ARI Slit ABeam 1st Target ARI 2nd Target Slit ARI+1

(1) Q(43mS) measurement

structure of N ～ 28 nuclei

• R. Chevrier et al., Phys. Rev. Lett. 108, 162501 (2012)

(2) New method for high spin alignment

Two-step PF + dispersion matching

• Y. Ichikawa et al., Nature Phys. 8, 918 (2012)

Qexp = 23(3) efm2

320 keV 415 ns

（ 3/2‒) 7/2‒

43S

GS

16 27

① μexp (GANIL) → Iπ = 7/2‒ → Iπ inversion ② Qexp (RIBF) → moderate 7/2‒ deformation → strong GS deformation?

PF-reaction-induced spin-aligned RI beams

A Y

Disp. matching The same A can be collected !

High-energy branches

（E/A = 200~345 MeV)

Low (Medium)-energy branches

(E/A ~ 100 MeV) (E/A≤ 10 MeV)

Key devices in old facility area Key devices in RIBF new facility area

SLOWRI ZeroDegree SHARAQ (U. Tokyo) SAMURAI Rare RI Ring SCRIT RIPS GARIS 1& 2 KISS (KEK) Biology

(primary-beam use)

CRIB (U. Tokyo)

3 different Spectrometers Invariant-mass spectroscopy In-beam γ-ray spectroscopy Missing-mass spectroscopy

in-flight reaction-based nuclear-physics studies

Selective excitation with ΔS, ΔL, ΔT RI beam RI beam RI beam

High-resolution. Excitation functions. projectile excitation. de-exicitaiton γrays. unbound states. particle correlations. SHARAQ ZeroDegree SAMURAI

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

② BigRIPS + ZD (+DALI2)

High-energy branches

particle ID / momentum analysis e.g. Doppler shifted γ-ray measurements

with identification of products

ZeroDegree

• γ spectroscopy

In-beam γ-ray spectroscopy (1)

• P. Doornenbal,
• H. Scheit et al.,

PRL 103, 032501 (2009)

• H. Wang, N. Aoi et al.,

PRC 88, 054318 (2013)

• S. Takeuchi et al.,

PRL 109, 182501 (2012)

DALI2 NaI array

In-beam γ-ray spectroscopy (2)

• D. Steppenbeck et al.,
• PRL. 114, 252501 (2015) – 50Ar

N = 32

• D. Steppenbeck et al.,

Nature (London) 502, 207 (2013). – 54Ca N = 34

neutron removal reactions

19C+C→18C 20C+C→19C 20C+C→18C 22C+C→20C

νs1/2 ground-state properties

• f 20C and 22C
• N. Kobayashi et al., PRC 86, 054604 (2012) ‒ 20,22C
• T. Nakamura et al., PRL 112, 142501 (2014) ‒ 31Ne

Press release paper

• N. Kobayashi et al., PRL 112, 242501 (2014) ‒ 37Mg

p-wave neutron halo of 37Mg

proton proton e- cathode +6000V

17/11/2015

• A. Obertelli et al., Eur. Phys. Jour. A 50, 8 (2014)

http://minos.cea.fr Hosted in the Spin-Isospin Laboratory at the RIKEN Nishina Center (T. Uesaka’ s lab)

MINOS : Magic Numbers Off Stability

In-beam knockout experiments Vertex resolution : < 5 mm FWHM Detection efficiency > 85% Position sensitive detector: X,Y Drift time: Z beam-axis direction

17/11/2015 14

DALI2 MINOS

DALI2-MINOS setup

• MINOS is a new detector to be used at the RIKEN RIBF

Thick liquid hydrogen target and vertex tracker. First of its kind.

• Unique advantages:

1) High luminosity 2) Improved resolution 3) Clean reaction probe for knockout An exciting physics program at the RIBF has started:

• Origin of di-neutron correlations in halo nuclei
• Three-body forces and continuum : binding energy of Oxygen isotopes
• Shell evolution and search for 2+ states in neutron rich nuclei (SEASTAR)
• - First spectroscopy of 66Cr, 72Fe and 78Ni recently measured –

http://minos.cea.fr

BigRIPS + MINOS

• C. Santamaria et al.,

PRL 115, 192501 (2015) – 66Cr, 70, 72Fe

High-energy branches

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

③ BigRIPS + ZD + EURICA

EUroball Rien Cluster Array ZeroDegree

• γ spectroscopy

③ BigRIPS + ZD + EURICA

EUroball Riken Cluster Array (EURICA) project

• Commenced since 2012 spring
• Gamma-ray detector clusters
• 84 high-purity germanium crystals in 12 clusters
• High resolution ( ~ 2.5 keV @ 1.3 MeV )
• High efficiency ( ~ 13% @ 1 MeV )
• High granularity ( 84 crystals )
• Double-side-stripped-silicon-detector stack
• 8 pieces of DSSD with 60 x 40 pixels

Project manager: S. Nishimura

Decay Spectroscopy around A = 100 ~ 145

Two EURICA data sets: G.Simpson/A.Jungclaus & H.Watanabe/G.Lorusso

New Isotopes

144Te 140Sb 139,140Sn 136,137In 134,135Cd 131,132Ag 129,130Pd 127Rh 120,121Tc 118Mo

and more.. U-beam: 8 – 10 pnA ~ 10 days Known T1/2

③ BigRIPS + ZD + EURICA

Z.Y. Xu, Nishimura et al., PRL 112, 132501 (2014)

126, 128Pd isomers

(N=82 magicity)

• H. Watanabe et al.,

PRL 111, 152501 (2013)

T1/2: 78Niand neighbors 118Tc→118Ru

P-A. Sӧderstӧrm et al., RC 88, 024301 (2013)

116Tc→116Ru

• J. Tapprogge et al.,

PRL 112, 132501 (2014)

p3/2 hole state (N=82 magicity)

110 Half-lives from Very Neutron-Rich Rb to Sn

G.Lorusso et al., PRL 114, 192501 (2015)

40 new half-lives !

International collaboration

Acknowledgement: Gammapool Owners Committee, GSI PreSPEC, RISP

• J. Agramunt, P. Aguilera, T. Alharbi, A. Algora, G. Angelis, N. Aoi, P. Ascher, R. Avigo,

H.Baba, C. Borcea, A. Boso, A.M. Bruce, R.B. Cakirli, F.L.Bello Garrote, G. Benzoni, J.S.Berryman, R. Berta, B. Blank, N. Blasi, A. Blazhev, P. Boutachkov, S. Bonig, A. Bracco, F. Browne, F. Camera, R.J. Carroll, S. Ceruti, I. Celikovic, K.Y. Chae, J. Chiba,

• L. Coraggio, A. Covello, F.C.L. Crespi, J.-M. Daugaus, R. Daido, P. Davis, M.C.

Delattre, F. Diel, F. Didiejean, Zs. Dombradi, P. Doornenbal, F. Drouet, H.J. Eberth, A. Estrade, Y. Fang, T. Faestermann, G. France, S. Franchoo, Y. Fujita, N. Fukuda, A. Gadea, E. Ganioglu, A. Gargano, W. Gelletly, M. Gerbaux, R. Gernhauser, G. Gey, J. Giovninazzo, S. Go, N. Goel, T. Goigoux, M. Gorska, A. Gottardo, H. Grawe, S. Grevy,

• C. Griffin, Vi. Guadilla, T. Hashimoto, S. Hayakawa, J. Henderson, C. Hinke, N.

Hinohara, E. Ideguchi, S. Ilieva, N. Inabe, T. Ishigaki, T. Isobe, Y. Ito, D.G. Jenkins, P.R. John, H.S. Jung, A. Jungclaus, T. Kajino, D. Kameda, H. Kanaoka, Y. Kanke, Y. Kawada, G.D. Kim, Y.-K. Kim, G. Kiss, Ka. Kobayashi, K. Kobayashi, M. Kobayashi, N. Kobayashi, K. Koehler, I. Kojouharov, T. Komatsubara, F.G. Kondev, Z. Korkulu, Y. Kondo, M. Kowalska, T. Kroll, R. Krucken, T. Kubo, S. Kubono, M. Kurata-Nishimura,

• T. Kurtukian Nieto, N. Kurz, I. Kuti, Y.K. Kwon, G.J. Lane, S. Lalkovski, G. Lane, E.

Lee, J. Lee, P. Lee, S. Lenzi, M. Lewitowicz, Z. Li, J. Liu, T. Lokotko, G. Lorusso, G. Lotay, R. Lozeva, D. Lubos, C. Magron, F. Molina, I. Matea, K. Matsui, M. Matsushita,

• B. Melon, D. Mengoni, B. Meyer, S. Michimasa, T. Miyazaki, V. Modamio Hoybjor, S.

Momiyama, C.-B. Moon, A. Montaner-Piza, A.I. Morales, P. Morfouace, S. Morimoto,

• K. Moschner, D. Mucher, E. Nacher, J. Nagumo, H. Naidja, T. Nakao, T. Nakatsukasa,

D.R. Napoli, F, Naquvi, M. Niikura, H. Nishibata, S. Nishimura, I. Nishizuka, C. Nita, F. Nowacki, A. Odahara, K. Ogawa, H. Oikawa, R. Orlandi, S. Ota, T. Otsuka, H.J. Ong, S. Orrigo, M. Rajabali, J. Park, Z. Patel, A. Petrovici, F. Recchia, V. Phong, Zs. Podolyak, O.J. Roverts, L. Prochniak, P.H. Regan, S. Rice, E. Sahin, H. Sakurai, K. Sato, H. Schaffner, H.Scheit, P. Schury, C. Shand, Y. Shi, S. Shibagaki, T. Shimoda, Y. Shimizu,

• K. Sieja, L. Sinclair, G.S. Simpson, P.-A. Soderstrom, D. Sohler, I.G. Stefan, K. Steiger,
• D. Steppenbeck, K. Sugimoto, T. Sumikama, D. Suzuki, H. Suzuki, T. Tachibana, K.

Tajiri, S. Takano, A. Tashima, H. Takeda, Man. Tanaka, Mas. Tanaka, Y. Takei, R. Taniuchi, J. Taprogge, K. Tajiri, T. Teranishi, S. Terashima, G. Thiamova, K. Tshoo, Zs. Vajta, J. Valiente Dobon, Y. Wakabayashi, P.M. Walker, H. Watanabe, A. Wendt, V. Werner, O. Wieland, K. Wimmer, J. Wu, Q. Wu, F.R. Xu, Z.Y. Xu, A. Yagi, S. Yagi, H. Yamaguchi, K. Yamaguchi, T. Yamamoto, M. Yalcinkaya, R. Yokoyama, S. Yoshida, K. Yoshinaga, G. Zhang

１ ９countries： ２ ３ ７collaborators！ Very high efficiency neutron detector  Survey of beta-delayed multi-neutron & T1/2

BRIKEN Project (RIBF)

3He Detectors + Silicon Strip detectors (AIDA)

High-energy branches

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

④ SHARAQ (CNS, the University of Tokyo) Missing-mass spectroscopy

• RI beams as probes
• e.g. double charge exchange

High-resolution spectrometer with dispersion-matched beam line

SHARAQ - high resolution

④ SHARAQ (CNS, the University of Tokyo)

Discovery of a new collective excitation mode: Isovector spin-monopole resonance

Press release, June, 2012

• K. Miki et. al. : Phys. Rev. Lett. 108, 262503 (2012)

Taken from http://www.s.u-tokyo.ac.jp/ja/press/2012/25.html

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

⑤ SAMURAI p a r t i c l e I D / m

• m

e n t u m a n a l y s i s e . g .

Doppler shifted γ-ray measurements with identification of products

SAMURAI - large acceptance

⑤ SAMURAI Superconducting large solid-angle spectrometer particle correlation unbound sates

⑤ SAMURAI

• NP1106-SAMURAI02 (Kondo): Spectroscopy of unbound oxygen

isotopes

• NP1106-SAMURAI04 (Orr & Gibelin) : Structure of 18,19B and 21,22C
• NP1106-SAMURAI03 (Nakamura): Exclusive Coulomb Breakup of

neutron drip-line Nuclei

• NP1112-SAMURAI08R1 (Otsu): Exploration of cluster states on

neutron rich isotopes by means of broadband magnetic spectrometer SAMURAI

• NP1206-SAMURAI10 (Lee): Study of neutron-proton correlation &

3N-force in N=Z nuclei

• NP1306-SAMURAI17 (Sasano & Zegers): Study of Gamow-Teller and

spin-dipole transitions from 132Sn via the (p,n) reaction at 270 MeV/u

• NP1306-SAMURAI14 (Muecher): Fission barrier studies of neutron-

rich nuclei via the (p, 2p) reaction (just started)

• NP1312-SAMURAI18R1 (Corsi & Yuki): Two-Neutron Momentum

Correlation in Borromean Nuclei

SPiRIT: study of symmetry energy for high dense region (ρ~2ρ0)

Measure differential flow and yield ratios for (π+ & π-), (p & n), (3H & 3He) in Heavy RI Collisions at E/A=300MeV

PRC71 (2005) 0146a08

π+ π- b~1fm

High-energy branches

（E/A = 200~345 MeV)

Low (Medium)-energy branches

(E/A ~ 100 MeV) (E/A≤ 10 MeV)

Key devices in old facility area Key devices in RIBF new facility area

SLOWRI ZeroDegree SHARAQ (U. Tokyo) SAMURAI Rare RI Ring SCRIT RIPS GARIS 1& 2 KISS (KEK) Biology

(primary-beam use)

CRIB (U. Tokyo) under construction / commissioning High-energy branches

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

⑥ Rare RI Ring Isochronous ring with individual injection

mass measurement for short-lived rarely-produced nuclei

Rare RI Ring - mass

Rare RI Ring (R3)

Hexagonal Symmetry Weak-Focusing Lattice Structure Energy 200 MeV/u Circumference 60.3 m Tunes 1.21 / 0.84 Acceptance Δp/p ±0.5% emittance 20π /10π mm mrad

• M. Wakasugi and
• Y. Yamaguchi et al.

F3

Fast- kicker system

SRC

rare-RI ring

Trigger signal

BigRIPS F0

Particle

Injection line

• Trigger signal to excite the kicker is generated by injecting RI itself at F3.
• Kicker magnetic field needs to be excited before the RI arrives.

Self-trigger mechanism

PID (∆E-E)

TOF start TOF stop m1 q = m0 q       1 T0 T

1

1− β1

2

1− T

1 T0

( )β1

( )

2 = m0

q       1 T0 T

1corr

m1 q γ1β1 = m0 q γ0β0 β1T

1 = β0T0

Relative mass measurements with references in IMS

Status of Rare RI Ring

• First commissioning using 78Kr beam

was conducted successfully.

• First-order trim field can adjust

the isochronism in an order of 10-ppm.

• For adjusting the isochronism

in an order of ppm. Resonant Schottky pick-up can be used for checking it. Next beam commissioning is scheduled in Dec. 2015.

• Verification of the principle of relative mass measurements

Primary beam : 48Ca 345 MeV/u Secondary particles : 38K, 40Ca, 36Ar, 39K, 37Ar, etc... We will start mass measurement experiments from 2016.

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

⑦ SLOWRI Slow beam production based on:

• the RF ion guide method
• Laser resonance ionization (PALIS)

High-energy branches

SLOWRI - slow RIBs

Slow beam production based on the rf ion guide method SLOWRI facility

“Super ISOLDE”

from BigRIPS Decay studies Degrader ISOL

• 1. Wide Range of Nuclides

No Chemical Processes in Production & Separation

• 2. High Purity

No Isobar No Isotone Contamination

• 3. Small Emittance
• 4. Variable Beam Energy

1-50 keV Slow Beam, <1eV Trapped RI, 1MeV/u (future option)

• 5. Human Accesibility during On-line Exp.

Central part is made of RF ring- electrodes with 0.28mm interval. An exit

• f 0.7 mmφ is located at the center.

OPIG

rf octopole beam guide made of CFRP

RF Carpet

• M. Wada et al.

SRC IRC

Target F2 F3

SLOWRI at RIBF

F1 D4

RF-carpet Gas Cell PALIS Gas Cell

SLOWRI BTL SLOWRI Exp Room Lasers

BigRIPS

10m

SLOWRI @BigRIPS F2

PALIS Gas Cell PALIS Gas Cell RF Gas Cell

BigRIPS

RF Gas Cell

1)Optical spectroscopy of neutron halo nucleus 11Be+

2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 6 7 8 9 10 11 12 Be RMS Nuclear Charge Radii [fm] Mass Number

550 600 650 700 750 800 850 900 340 360 380 400 420 counts / bin Microwave Frequency [kHz] - 2677 MHz

2)Mass measurements of short-lived nuclei

RMS Radii of Be HFS of 11Be+

Experiments at prototype SLOWRI

charge & magnetization radii in nuclear model independent

ion mirror ion mirror ion detector buncher

3)Resonance Ionization Spectroscopy

Parasitic RI beam production, spin, moments, radii..

8Li ToF spectrum

ToF = 7,994,989.2(8) ns Rm ~ 173,000 r-process, SHE

Takamine et al, PRL 112(2014)162502 Ito, Schury et al, PRC 88(2013)011306R

High-energy branches

（E/A = 200~345 MeV)

Low (Medium)-energy branches

(E/A ~ 100 MeV) (E/A≤ 10 MeV)

Key devices in old facility area Key devices in RIBF new facility area

SLOWRI ZeroDegree SHARAQ (U. Tokyo) SAMURAI Rare RI Ring SCRIT RIPS GARIS 1& 2 KISS (KEK) Biology

(primary-beam use)

CRIB (U. Tokyo)

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

⑧ SCRIT Self Confining RI Target electron-RI scattering

SCRIT - e-RI collision

Low (Medium)-energy branches

Elect ron St orage Sing in SCRI T Facilit y

e-beam Scattered electrons

WiSES SR2 (SCRIT-equipped RIKEN Storage Ring) Energy 100 – 700 MeV Stored current 300 mA (current operation) Lifetime ~ 1 AH Circumference 21.946 m Tunes 1.62 / 1.58 β-max 10.36 / 4.09 m ‘‘ion trapping’’ by circulating electrons high luminosity of an order of 1027 cm-2 s-1 with low yield RIs e.g.) 105 pps injection→ L~1026 cm-2 s-1

• M. Wakasugi and
• T. Onishi et al.

SCRIT (Se lf- Confining RI Ion T a rg e t)

SCRI T is inte rnal-targ e t-fo rming te c hnique in an e le c tro n sto rag e ring . T arg e t io ns are c o nfine d in the be am o rbit by pe rio dic fo c using fo rc e . Re c o ile d io ns sc atte re d e le c tro ns

T rappe d RI io ns inje c te d fro m o ut side Bunc he d e -be am in sto rag e ring ~1010 e le c tro ns/ bunc h Mirro r po te ntial fo r lo ng itudinally lo c alizing trappe d io ns

SCRIT

Cooler Buncher

T he SCRIT Ele c tron Sc a tte ring F a c ility

High-resolution spectrometer (WiSES) Electron beam 100~700MeV 300 mA Electron beam 150MeV

SR2 ERIS

2 4 6 m

Luminosity Monitor

Sta tus of SCRIT

 SCRI

T fac ility c o nstruc tio n has be e n almo st c o mple te d.

 T

he fac ility is no w unde r c o mpre he nsive te st.

 Wo rks I

n pro g re ss are :

 bug hunting in all syste m  impro ve me nt o f RI

be am e xtrac tio n e ffic ie nc y at E RI S

 impro ve me nt o f CD-Pulse c o nve rsio n e ffic ie nc y at bunc he r  RT

M be am po we r upg rade

 study o f de te c to r c harac te ristic s o f WiSE

S

 I

n this fisc al ye ar :

 e lastic sc atte ring c ro ss se c tio n me asure me nt fo r Xe iso to pe s  e xpe rime nts fo r RI

will be starte d.

High-energy branches

（E/A = 200~345 MeV)

Low (Medium)-energy branches

(E/A ~ 100 MeV) (E/A≤ 10 MeV)

Key devices in old facility area Key devices in RIBF new facility area

SLOWRI ZeroDegree SHARAQ (U. Tokyo) SAMURAI Rare RI Ring SCRIT RIPS GARIS 1& 2 KISS (KEK) Biology

(primary-beam use)

CRIB (U. Tokyo)

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

⑨ RIPS RIPS medium energy (~70A MeV) RIBs spin-polarized RIBs R&D bench

RIPS

• spin-oriented

medium-E RIBs

Low (Medium)-energy branches

⑨ RIPS

• T. Nagatomo et al.,

Hyperfine Int. 198, 103 (2010)

• N. Imai et al.,

PRC 85, 034313 (2012)

• Fragmentation-induced spin polarization
• Low-energy reaction
• R&D studies

μ & Q(23Al) by β-NMR

• A. Takamine et al.,

PRL 112, 162502 (2014) Laser spectroscopy of 11Be (SLOWRI prototype)

• T. Furukawa et al.,

NIMB 317, 590 (2013) IAS of 35Si Laser spectroscopy R&D (RIs in superfluid He)

High-energy branches

（E/A = 200~345 MeV)

Low (Medium)-energy branches

(E/A ~ 100 MeV) (E/A≤ 10 MeV)

Key devices in old facility area Key devices in RIBF new facility area

SLOWRI ZeroDegree SHARAQ (U. Tokyo) SAMURAI Rare RI Ring SCRIT RIPS GARIS 1& 2 KISS (KEK) Biology

(primary-beam use)

CRIB (U. Tokyo)

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

⑩ GARIS

GARIS 1 & 2 SHE researches

Gas-filled Recoil Ion Separator SHE researches

Low (Medium)-energy branches

⑩ GARIS

collection of nuclear reaction products produced in fusion-evaporation reaction with high efficiency

Summary for production and decay of 278113

278113 274Rg 270Mt 266Bh 279113

α

262Db 267Bh 268Bh 269Bh 270Bh 271Bh 258Lr

• ne n evaporation

five n evaporation decays observed in 278113 synthesis decays observed in 266Bh synthesis

209Bi + 70Zn → 279113* 248Cm + 23Na → 271Bh*

8.82, 9.05- 9.23 MeV 8.40 – 8.74 MeV (79 %) S.F. (21%) 8.57 – 8.80 MeV T1/2: 24.0+14

• 7 s

T1/2: 4.0+2.2

• 2.0 s

9.08, 9.77, 9.39 MeV SF 40.9, SF 0.787 s, alpha 8.63 MeV 126 s α α α α α 8.66 MeV 3.78 s

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)

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

⑪ CRIB

CRIB

CRIB: CNS Radio-Isotope Beam separator

Light unstable nuclei by in-flight reactions

Low (Medium)-energy branches

⑪ CRIB

• H. Yamaguchi et al., PRC 87, 034303 (2013)
• J. Chen et al.

PRC 85, 015805 (2012)

7Be(α, γ

α, γ)

25Al + p 7Li(α, γ

α, γ)

• H. Yamaguchi et al., PRC 83, 034306 (2011)

RIBF Layout

Self Confining RI Ion Target 700 MeV e-Storage ring 150 MeV e-Microtron

⑫ KISS

KISS

KISS: KEK Isotope Separation System

Multi-nucleon transfer reaction Laser resonance ionization Low (Medium)-energy branches

Summary

• 1. RIKEN RI Beam Factory
• Operation of RIKEN RIBF facility has been started since 2006
• Cyclotron complex → p ~ 238U beam at E/A up to 345 MeV
• RIBs at quite high currents delivered from BigRIPS
• 2. RIBF experimental key devices
• High-E branches: BigRIPS, ZeroDegree, SAMURAI, SHARAQ

w/ EURICA, MINOS, SπRIT, Coming soon: Rare RI Ring, SLOWRI New device : OEDO

• Low (Medium)-E branches: RIPS, SCRIT, GARIS, CRIB, KISS
• 3. Others
• New program: Transmutation
• RIBF upgrade