[PPT] - toward high precision nuclear spectroscopy at SLOWRI, RIKEN RIBF PowerPoint Presentation

SLIDE 1

SAMURAI Zero-Degree Mass Ring SHARAQ SCRIT (Universal SLOW RI-beam facility)

New Facility

Existing Facility

RIBF Accelerator Building RIBF Accelerator Building RIBF Experiment Building RIBF Experiment Building fRC fRC

（Fixed frequency ring cyclotron Fixed frequency ring cyclotron））

SRC SRC

（Superconducting ring cyclotron Superconducting ring cyclotron））

IRC IRC

（Intermediate ring cyclotron Intermediate ring cyclotron））

BigRIPS BigRIPS

(Projectile Fragment Separator) (Projectile Fragment Separator)

SLOWRI RIPS prototype SLOWRI

RI Beam Factory hardware has constructed!!

toward high precision nuclear spectroscopy at SLOWRI, RIKEN RIBF

Michiharu Wada, KEK IPNS Wako Nuclear Science Center & RIKEN Nishina Center already introduced in JCNP in Shanghai 2007

SLIDE 2

“Constructing an Ultimate Nuclear Model” “Try to Clarify the Origin of Elements” Mission of RIBF “Applications”

SLIDE 3

What is Ultimate Nuclear Model?

A nuclear model that describes all properties

f all atomic nuclei.

We are very much behind the goal. Not sure whether it is possible or not.

“An atomic nucleus is an elephant”

Jacek Dobaczewski

no way to describe an atomic nucleus with a few parameters

SLIDE 4

Z N

Expected Nuclides @ SLOWRI ≈ 3000

Mass Known

H H HeHe Li Li Be B B C C N N O O O F Ne NeNe Na MgMgMg Al Si Si Si P S S S Cl S Ar Cl Ar K Ar Ca K Ca CaCa Sc Ca Ti Ti Ti Ti Ti V Cr Cr Cr Fe Mn Fe Fe Fe Ni Co Ni Ni Ni Cu Ni Zn Cu Zn Zn Zn Ga Ge Ga GeGeGe Se As Ge Se Se Se Kr Br Se Kr Br Kr Kr Kr Sr Rb Kr Sr Sr Sr Y Zr Zr Zr Mo Nb Zr MoMoMo Ru MoMo RuRu RuRuRu Pd Rh Ru Pd Pd Pd Cd Ag Pd Cd Ag Pd CdCd Cd Sn In Cd Sn Sn Cd Sn Sn Sn Sn Sn Te Sb Sn Te Sb Sn Te Te Te Xe I Xe Xe Xe Ba Xe Xe Ba Cs Xe Ba Ba Ba Ce Ba Ba Ce La Ce Pr NdNd Sm NdNd Nd Sm Eu Sm Eu Sm GdGdGd Dy GdGd Dy Tb Gd Dy Dy Dy Er Dy Dy Er Ho Er Er Er Yb Tm Er Yb Yb Yb Yb Yb Lu Yb Hf Hf Hf Hf Hf W Ta W Re W OsOs OsOs Ir Os Pt Ir Pt Pt Pt Hg Au Pt HgHgHgHg Hg Tl Hg Tl Pb Pb Pb Bi U

Ni Sn Pb

Optically Measured

Universal Low-Energy RI-beam is essential !

46 elements, 600 nuclides

Our knowledge on atomic nuclei is very limited

“many new isotopes, we

nly know # of p and n”

(J. Äysto) Precise Ground State Properties:

(Precision)

SLIDE 5

Element synthesis in universe

Explosive Neutron Absorption Equivillium Mass、T1/2、 Pn、σ...

Mass

N Z

Langanke

Comprehensive Measurements of Mass, T1/2, Pn, ...

SLIDE 6

static properties

Radii, Spin, Moments, ... Decay studies

pure, thin source

ptical spectroscopy

Mass measurements

ion traps

}

Slow or Trapped pure RI

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

Penning Trap Mass Spectrometer Laser cooled Be ions in trap

Hyperfine structure spectroscopy of trapped Be ion

SLIDE 7

to perform comprehensive high precision nuclear spectroscopy

Universality: All Elements, Short-lived Nuclei
High Purity
Beam Availability: Parasitic capability

Trapped or low-energy RI with

SLIDE 8 H H HeHe Li Li Be B B C C N N O O O F NeNe Ne Na Mg MgMg Al Si Si Si P S S S Cl S Ar Cl Ar K Ar Ca K CaCa Ca Sc Ca Ti Ti Ti Ti Ti V Cr Cr Cr Fe Mn Fe FeFe Ni Co Ni Ni Ni Cu Ni Zn Cu Zn ZnZn Ga Ge Ga GeGe Ge Se As Ge Se SeSe Kr Br Se Kr Br Kr Kr Kr Sr Rb Kr Sr Sr Sr Y Zr Zr Zr Mo Nb Zr MoMo Mo Ru MoMo Ru RuRuRuRu Pd Rh Ru PdPd Pd Cd Ag Pd Cd Ag Pd CdCdCd Sn In Cd SnSn Cd Sn SnSnSnSn Te Sb Sn Te Sb Sn Te TeTe Xe I XeXeXe Ba Xe Xe Ba Cs Xe Ba Ba Ba Ce BaBa Ce La Ce Pr NdNd Sm Nd Nd Nd Sm Eu Sm Eu Sm Gd Gd Gd Dy GdGd Dy Tb Gd Dy DyDy Er Dy Dy Er Ho Er Er Er Yb Tm Er YbYbYb Yb Yb Lu Yb Hf Hf Hf Hf Hf W Ta W Re W Os Os OsOs Ir Os Pt Ir Pt Pt Pt Hg Au Pt HgHgHg Hg Hg Tl Hg Tl PbPbPb Bi H H He He Li Li Be B B C C N N O O O F NeNeNe Na MgMg Mg Al Si Si Si P S S S Cl S Ar Cl Ar K Ar Ca K CaCaCa Sc Ca Ti Ti Ti Ti Ti V Cr Cr Cr Fe Mn Fe Fe Fe Ni Co Ni Ni Ni Cu Ni Zn Cu Zn Zn Zn Ga Ge Ga GeGeGe Se As Ge SeSe Se Kr Br Se Kr Br Kr Kr Kr Sr Rb Kr Sr Sr Sr Y Zr Zr Zr Mo Nb Zr MoMoMo Ru Mo Mo RuRu Ru RuRu Pd Rh Ru PdPdPd Cd Ag Pd Cd Ag Pd Cd CdCd Sn In Cd SnSn Cd SnSn Sn SnSn Te Sb Sn Te Sb Sn Te Te Te Xe I Xe XeXe Ba XeXe Ba Cs Xe BaBa Ba Ce BaBa Ce La Ce Pr Nd Nd Sm NdNd Nd Sm Eu Sm Eu Sm GdGdGd Dy GdGd Dy Tb Gd Dy Dy Dy Er Dy Dy Er Ho Er Er Er Yb Tm Er Yb Yb YbYbYb Lu Yb Hf Hf Hf Hf Hf W Ta W Re W OsOs Os Os Ir Os Pt Ir Pt Pt Pt Hg Au Pt Hg Hg HgHgHg Tl Hg Tl Pb Pb Pb Bi

10^3 cps 10^5 cps 10^7 cps 10^9 cps

>10^3 listed

Intensity code, (600MeV/u, 1pµA)

T. Nakamura

RIBF (estimation) RI-Beam Yield

10^1 cps 10^3 cps 10^5 cps 10^7 cps

@1µA-p

ISOLDE (SC-fact) RI-Beam Yield

http://www.cern.ch/ISOLDE/ normal/isoprodsc.html All Element Species No chemical process All lifetime Nuclides In-Flight Separation

Ordinary ISOL Facilities In-Flight Separators High Energy RI-beams

Z N Z N In Target, Diffusion, Evaporation, Ionization

Difficult for Refractory or Chemically Active Elements

Fragment Separator

Degrader 100 MeV/u RI beam Target RF IonGuide Heavy Ion Cyclotron SPIG RF Carpet

+ + + + + +

Edc

Eeff

pure slow RI ~1MeV/u > ISOL to experiments Stopping & Cooling of RI-Beams in He Gas

Fragments of heavy ions All go through the target All Nuclides, Fast(<<ms) but High Energy (≈50%c) Limited Elements All Elements

Universality

SLIDE 9 H H He He Li Li Be B B C C N N O O O F Ne NeNe Na MgMgMg Al Si Si Si P S S S Cl S Ar Cl Ar K Ar Ca K Ca CaCa Sc Ca Ti Ti Ti Ti Ti V Cr Cr Cr Fe Mn Fe Fe Fe Ni Co Ni Ni Ni Cu Ni Zn Cu Zn Zn Zn Ga Ge Ga Ge Ge Ge Se As Ge SeSe Se Kr Br Se Kr Br Kr Kr Kr Sr Rb Kr Sr Sr Sr Y Zr Zr Zr Mo Nb Zr MoMoMo Ru MoMo RuRu Ru RuRu Pd Rh Ru Pd Pd Pd Cd Ag Pd Cd Ag Pd Cd CdCd Sn In Cd SnSn Cd SnSn Sn SnSn Te Sb Sn Te Sb Sn TeTe Te Xe I Xe XeXe Ba Xe Xe Ba Cs Xe BaBa Ba Ce BaBa Ce La Ce Pr Nd Nd Sm Nd Nd Nd Sm Eu Sm Eu Sm GdGd Gd Dy GdGd Dy Tb Gd Dy Dy Dy Er Dy Dy Er Ho Er Er Er Yb Tm Er Yb Yb YbYb Yb Lu Yb Hf Hf Hf Hf Hf W Ta W Re W OsOs Os Os Ir Os Pt Ir Pt Pt Pt Hg Au Pt Hg Hg HgHg Hg Tl Hg Tl Pb Pb Pb Bi

A A’ A/Z A N A

ISOL SLOWRI

In-Flight Separator + ISOL

Strong Alkaline Isobaric Contamination three orthogonal separation

Purity: Isobaric Contamination

SLIDE 10

An Inconvenient Truth

Xe 0.5 pu"A (3*10^12 pps)

1 mpps 1 pps 1 kpps 1 Mpps 1 Gpps

H H He He Li Li Be B B C C N N O O O F NeNe Ne Na MgMgMg Al Si Si Si P S S S Cl S Ar Cl Ar K Ar Ca K Ca Ca Ca Sc Ca Ti Ti Ti Ti Ti V Cr Cr Cr Fe Mn Fe Fe Fe Ni Co Ni Ni Ni Cu Ni Zn Cu Zn Zn Zn Ga Ge Ga Ge GeGe Se As Ge Se Se Se Kr Br Se Kr Br Kr Kr Kr Sr Rb Kr Sr Sr Sr Y Zr Zr Zr Mo Nb Zr MoMoMo Ru MoMo Ru Ru Ru RuRu Pd Rh Ru Pd Pd Pd Cd Ag Pd Cd Ag Pd Cd CdCd Sn In Cd Sn Sn Cd Sn Sn SnSn Sn Te Sb Sn Te Sb Sn Te Te Te Xe I Xe Xe Xe Ba Xe Xe Ba Cs Xe BaBa Ba Ce Ba Ba Ce La Ce Pr Nd Nd Sm Nd Nd Nd Sm Eu Sm Eu Sm Gd Gd Gd Dy Gd Gd Dy Tb Gd DyDy Dy Er Dy Dy Er Ho Er Er Er Yb Tm YbY

Many nuclides are simultaneously produced from a single ion beam When other one plays with 78Ni, Many nuclides are freely available at F1 or F2 slits A/Z=+5% A/Z=-5% >99.9% are simply abandoned! Availability

SLIDE 11

for Universality

Fragment Separator

Degrader 100 MeV/u RI beam Target RF IonGuide Heavy Ion Cyclotron SPIG RF Carpet

+ + + + + + +

Edc

Eeff

pure slow RI ~1MeV/u > ISOL to experiments Stopping & Cooling of RI-Beams in He Gas

Fragments of heavy ions All go through the target

SLIDE 12

200 mmφ

TM

nozzle 0.7mmΦ

He 100Torr x 2m

～2MeV/u (0~10MeV/u)

EDC <10 V/cm

M.Wada et al, NIM B204 (2003) 570.

+ + + +

Edc

Eeff

~

RF gradient Field: Ion Barrier

Eeff in gas

max

= mµ

2Vrf 2

er0

3

2r0 ≈ electrode distance F = − e

2

4m 1 (Ω

2 +1/ τ v 2) ∇E rf 2 (r)

(E(r,t) = E rf (r)cos(Ωt), τ v: relax time)

RF-Carpet

12 A.Takamine et al, R.S.I. 76(2005)103503

RF Carpet Ion Guide

frequency is a key issue for low mass ions

~The heart of SLOWI~

0.28mm Interval co-centric ring electrodes 0.7φ Nozzle

SLIDE 13

Fast RI Beam <30 keV RI beam 2 m

high voltage cage

RF Carpet Gas Cell -bird’s eye view-

cryogenic gas cell

pitch: 160 um (80+80) exit orifice: 320 umΦ

RF Carpet

F. Arai et al IJMS 362(2014)56

ion RF carpet

2x175W@77K

SLIDE 14

Axial Curtain(PCB) Exit Curtain(PCB) Fast RI beam exit(strip) Entrance(strip) side(strip) Bottom(strip) top(strip)

Axial Curtain

100umφ, 100um gap ion surfing mode transport on a rf curtain

S. Masuda 1972, G. Bollen 2011

IJMS 299(2011)131

RF transport structure in the cell

270 160 1500 1500max 80max <4ms <25ms

SLIDE 15

for Availability

SLIDE 16

F2 Target

1) Stop & Neutralize in Ar (1 bar) 2) Extract by Gas Flow 3) Re-Ionize at Exit and SPIG not universal, not very fast but A/Z, Z, A separation

F1

PALIS

PArasitic slow RI-beam with gas catcher Laser Ion Source

T. Sonoda et al, AIP C.1104(2009)132

SLIDE 17

17

PALIS Gas Cell @ BigRIPS F2

Laser ¡beams

Low ¡energy ¡parasi.c ¡RI-‑beam

Main ¡Beam BigRIPS ¡ F2 ¡chamber

Degrader Ar/He Gas Cell 1-2 bar Laser atom/ion beam

SLIDE 18

nline commissioning

machine study run in Oct. 2015

1. Any disturbances to the main experiment?

1. Stray light of laser harm BigRIPS detectors? 2. Noises from PALIS (RF, Pulse etc) harm BigRIPS detectors? 3. Scattering particles harm Main experiment?

2. Extraction of RI

1. RI ( 58Cu ) extracted by gas flow ? 2. Laser re-ionization effect?

bias off laser off bias on laser off bias on laser on bias on laser off

？

OK OK OK OK

β-ray count rate at the exit of gas cell

SLIDE 19

SLOWRI

Stopped and low energy pure RI-beams of all elements for comprehensive precision spectroscopy

F2

SLOWRI BTL

RFC Gas Cell Just installed

BigRIPS

PALIS Gas Cell RF Carpet Gas Cell

Universal RI Parasitic RI

Mass Spectrograph Laser Spectroscopy Trap Apparatuses αβγn spectrometers

PALIS Gas Cell Relativistic RI Beam Low-energy or Trapped RI Beam

SLIDE 20

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 PALIS Gas Cell @F2 PALIS Gas Cell Parasitic RI Z: ≈70% Text: 0.04~0.4 s effi: ≈1% RFC Gas Cell RFC Gas Cell Z: ≈100% Text: ≈10 ms effi: ≈10%

SLIDE 21

NMR-ON C

l

e r

B

u n c h e r I

n

T r a p s C

l

l i n e a r L a s e r A B M R MRTOF Tokyo-EBIT Laser Table

Tape+ Total Abs BRIKEN implantation

B2F

DC 30keV beam Bunched 1k - 10keV

SLIDE 22

SLOWRI 2, 5, and 10 years strategy

2 years: commissioning and DayOne exp.
5 years: various exp. with full functioning SLOWI
10 years: extension of SLOWRI

Hyperfine Structure by RIS, Mass by direct MRTOF Collinear laser, Decay, Mass, Pn, β-NMR re-acceleration, F1-PALIS, SCRIT, HI-ISOL Slow RI-beams of all elements for comprehensive precision spectroscopy

SLIDE 23

Day zero exp @ rf gas cell

XDS35i KTS030 rack monotorr

T M P - 4 5 0 C F N W 5 0 K F Valve+Bellows Sterrer ELS4XD065-KD-A ELS2X-E025-K2D-01 S S D 検出器 S S D 検出器水平アクチュエータ ( 2 5 0 m m ) 2 軸楔デグレーダ回転機構固定厚デグレーダ交換機構 3 枚 ( 2 m m X 1 5 ) プラスチック検出器 ( 3 x 2 0 0 x 1 5 0 ) 鉛 1 0 m m スリット（ 4 軸、開口 2 0 0 x 1 0 0 )

型番は参考

B i g R I P S D 4 PPAC( 予備） ELS2X-E025-K2D-01

Ion Trap (New) RF-Carpet Gas Cell H i g h E n e r g y R I

b

e a m MRTOF

direct coupling of MRTOF to Gas Cell

SLIDE 24

ion mirror ion mirror ion detector buncher

MRTOF Mass Spectrograph

lap# =115 (2.3 ms)

Rm~200,000

Simple device but advantage to Penning Trap for short-lived nuclei

All isobars are measured (simultaneously) in one spectrum.
No scan is needed, all particles contribute to statistics.
ΔM ~ 10 keV/c2 is feasible in 2 ms cycle.

Ti (electrodes, base)

P . Schury et al., NIMB335(2014)39

SLIDE 25 Cr

27.5 ms 65

Cr

23.8 ms 66

Mn

64.2 ms 66

Mn

46.7 ms 67

Mn

28.4 ms 68

Mn

16.0 ms 69

Fe

351 ms 66

Fe

394 ms 67

Fe

188 ms 68

Fe

110 ms 69

Fe

77 ms 70

Fe

28 ms 71

Fe

10 ms 72

Co

329 ms 496 ms 67

Co

200 ms 1.6 s 68

Co

227 ms 69

Co

113 ms 500 ms 70

Co

80 ms 71

Co

59.9 ms 72

Co

41 ms 73

Co

30 ms 74

Ni

68 s 68

Ni

11.5 s 3.5 s 69

Ni

6.0 s 70

Ni

2.56 s 2.3 s 71

Ni

1.57 s 72

Ni

840 ms 73

Ni

680 ms 74

Ni

341 ms 75

Cu

638 ms 1.27 s 76

Cu

2.85 m 69

Cu

44.5 s 33 s 70

Cu

19.4 s 71

Cu

6.63 s 72

Cu

4.2 s 73

Cu

1.63 s 74

Cu

1.22 s 75

Zn

5.7 s 76

Zn

46.5 h 72

Zn

23.5 s 13.0 ms 73

Zn

95.6 s 74

Zn

10.2 s 5 s 75

Zn

2.08 s 1.05 s 77

Ga

32.6 s 76

Ga

126 s 75

Ga

13.2 s 77

Ga

5.09 s 78

Wide band mass spectrograph

P . Schury et al, simultaneously measure multiple A nuclides

IJMS 359(2013)19

Different A ions have different # of laps, Identification of # laps is possible by a simple algorithm. 72 77 71 70 76 69 68 67 75 73 74

(119) (120) (121) (123) (124) (125) (126) (127) (128)

SLIDE 26

Ni Co Ni Ni Ni Cu Ni Zn Cu Zn Zn Zn Ga Ge Ga GeGeGe Se As Ge Se Se Se Kr Br Se Kr Br Kr Kr Kr Sr Rb Kr Sr Sr Sr Y Zr Zr Zr Mo Nb Zr MoMoMo Ru MoMo RuRuRuRuRu Pd Rh Ru Pd Pd Pd Cd Ag Cd

Sn

1.3
0.9
0.6
0.7

4.8 6.8 7.4 6.8 8.2 3.8 2.0 1.4

0.5

0.1

0.7
0.4
0.7
0.7
1.0
1.2
1.4
1.5
1.6
1.7
1.8
2.2
1.4
1.3
1.0
0.7

5.7 5.1 12.4 9.5 4.0 5.3 1.3 1.5 1.1 0.8 0.4 0.2

0.1
0.0
0.2
0.6
1.2
1.3
1.5
1.7
1.8
2.1
1.6
1.5
1.0
0.7

0.5 1.9 3.2 4.1 2.8 4.7 2.5 5.3 1.5 2.2 0.7 1.3 0.8 0.6 0.2 0.1

0.3
0.5
0.7
1.6
1.7
1.6
1.9
1.9
1.4
1.4
1.1
0.7

2.2 2.0 4.5 3.4 7.3 3.5 2.2 5.2 1.4 2.0 1.0 0.8 0.3 0.2

0.0
0.3
0.5
1.4
1.5
1.7
1.7
2.1
2.1
2.3
1.9
1.8
1.4
1.2
0.8
0.9

1.5 2.2 3.0 4.5 5.4 3.6 3.1 4.7 4.2 2.7 2.1 1.5 1.1 0.7 0.5 0.2 0.1

0.2
0.5
1.1
1.5
1.5
1.8
1.9
2.1
2.2
2.1
2.0
1.7
1.4
0.9
0.8

1.8 1.5 3.9 3.1 7.4 5.1 6.0 3.7 4.6 3.7 1.3 1.5 0.9 0.7 0.3

0.0
0.3
1.1
1.1
1.5
1.5
1.7
1.8
1.8
1.7
1.5
1.7
0.9
1.0

1.6 2.2 3.0 3.5 5.4 5.0 6.8 6.2 5.0 5.1 3.7 2.7 1.2 1.5 1.3 1.1 0.6 0.3

0.0
0.3
0.8
1.3
1.4
1.6
1.7
2.0
2.0
1.8
1.7
1.5
0.9

1.6 1.4 3.4 2.5 5.9 4.4 7.0 13.3 3.0 27.4 3.1 2.3 1.5 1.2 0.7 0.2

0.4
0.8
0.6
1.2
1.3
1.9
1.9
1.6
1.7
0.7
1.1

1.3 1.9 2.3 3.2 3.8 4.8 5.3 2.6 3.0 5.1 3.9 3.3 2.2 1.7 1.7 1.2 0.6 0.3

0.3
0.5
1.0
1.2
2.1
2.0
1.8
1.5
1.2
1.0

1.2 1.4 2.8 2.4 4.7 3.6 28.8 5.1 12.9 8.5 3.7 4.0 2.3 1.5 0.9 0.3 0.1

0.7
0.1
2.0
1.9
1.7
1.9
0.9
1.2

1.3 1.6 2.4 3.0 3.1 1.5 4.2 1.9 6.9 6.5 6.2 18.2 3.0 3.0 2.2 1.8 0.7 0.8 0.4

0.4
0.7
2.3
2.1
2.0
1.8
1.8
1.7
1.1

0.9 1.0 2.2 2.1 3.8 3.1 6.3 5.1 6.7 6.6 9.0 4.5 4.0 2.6 1.9 1.4 0.0

0.4
2.0
1.9
1.8
1.7
1.0
1.3

1.2 1.5 1.9 0.9 2.6 0.7 4.0 4.7 5.5 7.0 5.4 6.7 4.1 4.6 3.1 2.8 0.7 0.6

0.3
2.1
2.1
1.9
1.8
1.6
1.3

0.6 0.7 1.5 1.6 3.2 2.7 4.8 3.8 6.9 5.5 13.7 6.7 27.1 4.8 1.5 0.3

2.1
1.9
1.9
1.1
1.3

0.6 1.1 1.3 1.9 2.3 2.9 3.6 4.7 10.3 15.0 11.8 6.5 4.9 3.6 0.5 1.2 0.2

2.1
1.9
1.9
1.6
1.0

0.5 0.5 1.3 1.2 2.7 2.1 4.3 3.0 11.1 5.4 26.6 2.9

2.0
2.0
1.1
1.3

0.3 0.8 1.1 0.9 2.3 2.4 4.0 4.2 4.9 5.6 14.1 14.1 12.8 1.2 2.9 0.7

2.1
2.0
1.8
1.2

0.0 0.1 1.1 1.0 2.3 1.8 3.5 3.8 5.4 6.5

2.1
1.3
0.4
0.1

0.5 0.5 2.5 2.8 3.3 2.7 6.1 4.9 8.0 7.3 1.6

2.0
1.9
1.2
0.3

0.1 1.0 2.1 2.3 3.0 3.1 5.5 4.5 6.2

2.2
1.4
2.0

0.2 0.7 1.4 1.7 2.1 2.1 2.8 2.9 3.6 3.6 6.6 3.2

2.1
2.0
1.5
0.5

1.0 1.2 1.7 1.9 2.5 2.6 3.5 3.5 4.4

1.5
0.9

0.2 0.8 1.2 1.3 1.8 2.0 2.5 2.6 3.3 3.5

1.3
0.0

0.5 0.7 0.8 1.3 1.5 2.1 2.2 2.8 3.0

1.1
0.7
0.4

0.1

0.2

0.6 0.9 1.2 1.4

1.3
2.6
2.5

0.3 0.7 1.3 1.3

3.4 2.1 4.0 3.3

1.1

4.6 4.0 0.7 5.1 4.6 3.5 2.1

2.3

5.4 5.1 4.3 3.3

0.5

5.7 5.6 4.7 3.9 1.2 5.7 5.9 5.1 4.6 2.8

1.1

5.7 5.7 5.4 5.1 4.4 3.5 0.4 5.8 5.9 5.6 5.5 4.9 4.2 2.0

1.6

5.5 5.8 5.8 5.8 5.3 4.7 4.1 3.2

0.0

5.5 5.8 5.9 5.9 5.6 5.2 4.6 3.9 1.5

2.3

5.4 5.7 5.8 5.8 5.7 5.5 5.0 4.4 3.7 2.7

1.0

5.3 5.8 5.8 5.9 5.8 5.7 5.3 4.9 4.2 3.4 0.6

2.7

4.8 5.2 5.5 5.8 5.9 6.0 5.6 5.2 4.7 4.0 3.4 2.5

1.0

4.6 5.1 5.5 5.8 5.9 6.0 5.8 5.5 5.1 4.5 4.0 3.3 0.5 4.3 4.9 5.4 5.7 5.8 5.9 5.9 5.8 5.4 4.8 4.5 3.9 3.2 2.2

1.9

4.0 4.6 5.2 5.8 5.8 5.9 5.9 5.9 5.6 5.2 4.8 4.4 3.9 3.2

0.1

3.7 4.2 4.7 5.2 5.5 5.9 5.9 5.9 5.7 5.5 5.0 4.8 4.4 3.8 3.1 1.9 3.3 3.9 4.5 5.0 5.5 5.8 5.9 6.0 5.7 5.6 5.2 5.0 4.7 4.3 3.8 3.0

1.5

3.0 3.6 4.2 4.8 5.4 5.8 5.6 6.1 5.8 5.5 5.3 5.2 5.0 4.7 4.3 3.7 2.4 0.5 2.7 3.3 3.9 4.6 5.2 5.8 5.6 6.0 5.9 5.6 5.4 5.3 5.2 5.0 4.6 4.1 3.4 2.4

2.5

2.2 3.0 3.6 4.2 4.7 5.1 5.5 5.9 5.9 5.5 5.4 5.5 5.3 5.2 4.9 4.5 4.1 3.2 2.2

0.4

1.3 2.7 3.3 3.9 4.5 5.0 5.5 5.9 6.0 5.5 5.4 5.6 5.3 5.3 5.2 4.9 4.5 3.8 2.9 1.9 0.3 2.3 2.9 3.6 4.2 4.8 5.4 5.8 5.7 5.5 5.5 5.5 5.4 5.4 5.3 5.1 4.9 4.4 3.6 2.6 1.2

1.9
0.7

1.5 2.5 3.2 3.8 4.6 5.3 5.8 5.6 5.5 5.5 5.6 5.5 5.4 5.5 5.3 5.1 4.9 4.2 3.3 2.3 0.5

2.9
0.9

1.3 2.3 3.5 3.6 4.2 4.9 5.5 5.5 5.5 5.6 5.6 5.6 5.5 5.6 5.4 5.1 4.6 3.9 3.0 2.0

0.5
2.0
0.0

1.7 3.4 3.9 4.1 4.6 5.4 5.5 5.5 5.5 5.6 5.6 5.5 5.7 5.6 5.3 5.0 4.4 3.6 2.7 1.4

0.9
2.6

0.6 2.1 2.8 4.0 3.7 3.9 4.3 4.7 5.1 5.3 5.6 5.6 5.6 5.6 5.6 5.3 4.8 4.1 3.3 2.3 0.8

1.3

1.4 2.6 3.9 4.2 3.6 4.1 4.6 5.0 5.3 5.6 5.6 5.7 5.6 5.8 5.4 5.1 4.5 3.8 3.1 2.1

2.4
0.1

2.1 2.7 4.1 3.4 3.9 4.4 4.9 5.2 5.5 5.3 5.6 5.5 5.6 5.5 5.4 4.9 4.3 3.7 2.8

2.6
1.6

0.8 3.4 3.9 3.3 3.6 4.2 4.7 5.2 5.5 5.3 5.6 5.5 5.7 5.6 5.6 5.2 4.7 4.1 3.4

2.6
2.7
0.3

1.7 2.7 4.0 3.4 3.9 4.5 5.1 5.5 5.3 5.6 5.4 5.7 5.6 5.8 5.5 4.9 4.5 3.9 0.7

1.6

0.2 3.3 3.9 3.4 3.5 4.3 5.0 5.5 5.2 5.6 5.4 5.7 5.6 5.8 5.7 5.3 4.8 4.4 2.9

2.7
1.1

1.5 2.6 3.2 3.3 3.4 3.9 4.5 5.1 5.5 5.3 5.6 5.7 5.7 5.8 5.6 5.0 4.7 4.2 3.5

2.1
0.1

3.2 3.8 3.3 3.4 3.5 4.3 5.0 5.5 5.3 5.6 5.7 5.8 5.8 5.8 5.3 4.9 4.5 4.0

1.3

0.7 3.4 4.0 3.3 3.4 3.6 4.0 4.5 5.2 5.6 5.4 5.7 5.8 5.7 5.5 5.1 4.8 4.3

r-process path

rp-process path SLOWRI & mass unknown

0.5

3.7

log Yiled log T1/2

SLIDE 27

27

New Idea for β-delayed Neutron Measurement

In-gas cell decay + MRTOF

pure Br-94 beam gas cell cooler-buncher n TOF Counts

A=93 A=94 A=92

94Kr 93Kr 92Kr 94Br

MRTOF MRTOF distinguish A, Z robustly xn daughters are same element (identical ε)

Delayed neutron branching ratio by recoil particle identification

distinguish precursor & daughter is essential

P1n = Nβn/Nβ = N(93Kr)/N(94Kr+93Kr+92Kr) P2n = Nβ2n/Nβ = N(92Kr)/N(94Kr+93Kr+92Kr)

En < 1MeV, Erecoil ≈ 20 keV

SLIDE 28

T. Sonoda, P. Schury,Y.Ito, F. Arai,
M. Reponen, T. Kojima,
I. Katayama, S. Arai,K. Kusaka,
T. Fujinawa, T. Maie, H. Yamasawa,
T. Kubo,A. Takamine, H. Ueno

RNC SLOWRI & corporative Teams

H. Miyatake, Y. Watanabe, Y. Hirayama

KEK, IPNS, WNSC

K. Okada

Sophia Univ.

H. Iiimura

JAEA

H. Tomita

Nagoya Univ.

H. Wollnik

New Mexico State Univ.

Collaborators

MRTOF team in 2013

SLIDE 29

Management Group Coordinator: Ueno (Riken) Facilities KISS: Y. Hirayama (KEK) SLOWRI: M. Wada (KEK/RIKEN) GARIS: K. Morimoto (RIKEN) etc. Devices … Project … RIBF PAC Steering Committee Chair: M. Wada (KEK)

H. Ueno (RIKEN), G. Georgiev (Orsay), A. Andreyev (York), H. Watanabe (RIKEN),

K.Y. Kwon (IBS), Y. Watanabe (KEK), K. Morita (kyushu U.) Research Community Proposal Spokespersons Individual Membership Specific network of research groups IGLIS-net Proposals Construction Proposals RIKEN Nishina Center Director: H. En’yo RIBF Experiments

SSRI-‐‑–pns ¡collaboration

‐‑– ¡Slow ¡& ¡Stopped ¡RI ¡for ¡precise ¡nuclear ¡spectroscopy ¡-‐‑–

WNSC, KEK Head: H. Miyatake RIBF Users Group