Download - RI Beam Factory Project at RIKEN
RI Beam Factory Project at RIKEN
H.SakuraiRIKEN Nishina Center for Accelerator-based Science
http://www.nishina.riken.jp/
1. Overview of RIBF facility and physics with exotic nuclei
2. Introduction of Phase-I facility and Experimental programs
3. Recent achievements and future plan4. Summary
RIPSGARIS
~100 MeV/u
CRIB (CNS) BigRIPS/ZeroDegree
~5 MeV/u
350-400 MeV/nucleon
Existing facility
New facility 350 MeV/nucleon up to U
1st beam in 2006
Phase–I 2007-SRC + BigRIPS/ZeroDegree440 M$ (1$=100JPY)
Phase-IIExperimental Installations2007~2010 (plan)
RIBF Facility Layout
SRC
RILAC
AVF
RRCfRC
IRC
SHE
~10 MeV/u
- towards the drip-lines -
Fission 238U 350A MeV
neutron-rich side 20<Z<60
wide dynamic range
Projectile fragmentation 48Ca, 58Ni, 78Ge, 78Kr, 112Sn, 204, 208Pb, 238U, ... 350~400A MeV proton-rich side neutron-rich A<50 or A>160
SRC high energy and intense heavy ion beams upto U 350 – 400 A MeV Goal of intensity 1 p-micro ABigRIPS high acceptance for fission fragments
limit of production 1 particle/day
Exploration of the limits of nuclear existence
3rd generation of RI beam facility “Fission fragment of U”
78Ni ~10 particles/sec goal
SAMURAI - large acceptance Kobayashi et al.
SHARAQ - high resolution Shimoura et al.
Rare RI Ring – mass Ozawa et al.
SCRIT - e-RI collision Wakasugi, Suda et al.
SLOWRI- slow beams Wada et al.
Phase-II construction 2007-2010To maximize the potentials of intense RIBs available at RIBF
RI Spin Lab. at RIPS –pol. RI beam Ueno et al.
http://rarfaxp.riken.go.jp/RIBF-TAC05/
in 2008
60 M$
About 2M $ was approved in FY2007 for the infrastructure, radiation shields, ZeroDegree electronics.
by Narumasa Miyauchi
Acceleration Flow in RI Beam Production
RILAC
RRC
fRC
IRC
SRC
BigRIPS
ZDS
6
BigRIPS Fragment Separator high acceptance for fission fragments pid for RI beams at the second section
ZeroDegree Multi-function BT line pid for ejectiles in inclusive- and semi-exclusive measurement medium resolution (p/dp ~ 2000 – 4000)
Experimental set-ups
BigRIPS /ZeroDegree
operated by Kubo group
Exploration into “Isospin Frontier” toward the drip-linesReaction study fit for high energy domain 200-300A MeV
RIB productionPID section
PID section
Configuration Two-stage separator First stage Two bends Second stage Four bendsEnergy degrader Achromatic wedgeQuadrupoles SuperconductingAngular acceptance Horizontal 80 mr Vertical 100 mrMomentum acceptance 6 %Max. magnetic rigidity 9 TmTotal length 77 mMomentum dispersion* First stage -2.31 m Second stage 3.3 mMomentum resolution**(1st order) First stage 1290 Second stage*** 3300
Basic parameters of BigRIPS
* At the mid-focus of the stage. ** Those in the case when a 1 mm beam spot is assumed.
In-flight fission of 2
38U at 350 MeV/u~ 100 mr~ 10 %
T. Kubo et al.
Specifications of optical modes(I) Achromatic: Large acceptance mode
Maximum magnetic rigidity = 7.3 TmAngular acceptance Horizontal = +/-45 mrad, Vertical = +/-30 mardMomentum acceptance = +/-3 %Momentum dispersion = 2.24 cm/%Momentum resolution = (X,P)/(X,X) =1240
(II) Achromatic: High resolution modeMaximum magnetic rigidity = 9.0 TmAngular acceptance Horizontal = +/-20 mrad, Vertical = +/-30 mardMomentum acceptance = +/-3 %Momentum dispersion = 2.12 cm/%Momentum resolution = (X,P)/(X,X) = 2120
(III) Dispersive spectrometer modeMaximum magnetic rigidity = 9.0 TmAngular acceptance Horizontal = +/-20 mrad, Vertical = +/-30 mardMomentum acceptance = +/-2 %Momentum dispersion = 4.13 cm/%Momentum resolution = (X,P)/(X,X) = 4130
(IV) Transmission mode
BigRIPS in-flight production of fast rare-isotope beams Ground state properties and low lying excited states
via decay spectroscopy / transmission method: particle stability, T1/2, Q, R, Ex.(2+)... Deeply bound pionic states via (d, 3He) at 500 MeV Three-body force via pol. d+p elastic scattering at 700 MeV
ZeroDegree multi-function beam line for inclusive/semi-inclusive measurements production of 3rd RI beamsCollectivity and matter distribution
via in-beam gamma / missing mass spectroscopy One step energy regime 200~300 A MeV B(E2), B(M1), (p,p), (p,p’), Ex....
Phase-I programs at BigRIPS/ZeroDegree 2007~
Rare-Isotope Physics Programs Fast RI beam production to search for new isotopes Global survey to search for anomalous regionsSpecific programs with deuteron beams
RIBF layout
in 2007-2008(Phase-I layout)
Experimental set-ups
ZDS: Zero-Degree forward Spectrometer
-spectroscopy
in-beam gamma spectroscopymissing mass spectroscopy
total reaction cross sections
(d,3He) Pol.d+p
ZeroDegree Spectrometer
http://www.nishina.riken.jp/UsersGuide/BigRIPS/intensity.html
RI beam intensities at BigRIPS for first two years 2007-2008
Primary beam energy 350AMeV48Ca (200pnA), 86Kr (100pnA),136Xe (10pnA), 238U(2pnA)
Secondary beam energy ~250A MeVCross sections Fragmentation EPAX-II
Fission GSI-data (U+Be), ABRABLA (Coulomb)
CollaborationOne of the largest heavy-ion facilities in the Asia/world
Open for the world-wide user community
International Collaboration Workshop on Experiments at the RIBF6th-9th November 2006 ~130 participants; ~30 from foreign institutes/universities
Presentation and discussion of experimental projects to be done in collaborationTo identify common interestsTo have “show case” for experimental technique, methods, detectors …To establish collaborationsTo prepare proposals
MOU“Creation of the council for China-Japan Research Collaboration on Nuclear Physics”10th November 2006
19 proposals submitted to PAC Feb.2007 (74% international)
France-Japan collaboration will be established soon
Recent achievements / Future plan
28th Dec. 2006First Beam 27Al10+ at RIBF-SRC
Mar. 200712th 86Kr31+ beam at 345 A MeV several pnA.13th First Production of RIBs at BigRIPS23rd First successful acceleration of 238U beam 0.002pnA27th First production of radioactive isotope beams via a U beam
Last week 238U beam 0.02pnA max BigRIPS Commissioning; New isotope 125Pd
Recent achievements
First beam accelerated at SRC K2600MeV
16:00 28th Dec., 2006 27A l 10+ 345MeV/u
N=Z
N=Z+1
N=Z+2
N=Z+3
Sc
Ca
TiV
CrMn
Fe
Co
NiCu
Zn
K
Ar Cl
S P
SiAl
43Sc
54Fe
First RIB
13th Mar. 200786Kr + Be(2mm) at 345 MeV/u
E
TOF (F3-F7) Kubo et al.
PID for isotopes created via a 345 A MeV U beams w/o degrader
TOF(F3-F7) [ns]
E@
F7 [
MeV
]
Nb
Y
Tc
Rh (Z=45)
Ag
In
Sb
IXe
RbBr (Z=35)
AsGa
CuCo
Zr (Z=40)
Mo
Ru
Pd
Cd
Sn (Z=50)
Te
Sr
KrSe
Ge
Zn (Z=30)
Ni
Fe
98Y
132Sn
104Zr
117Rh
91Br
76Zn70Ni
82Ge
Mar. 27th, 2007
T. Kubo et al.
A/Q
Z
Z
A/Q
Z=46
Bρ: 7.438 TmTarget: Be 7mm
Total dose: ~1×1013
Total time: 25.4 hours
238U86+ 345 MeV/u~ 1enA on Target
The first test experiment at RIBF
M.Bernas et a. PLB 331(94)19; PLB 415(97) 111
122Pd
123Pd124Pd
125Pd
122Pd45+
121Pd45+
120Pd45+
119Pd45+
123Pd45+
A/Q
Co
unt
s
122Pd 2.6521(2.6506) 38 counts
123Pd 2.6739(2.6728) 245 counts
124Pd 2.6956(2.6952) 173 counts
125Pd 2.7174(2.7171) 59 counts
122Pd45+ 2.7111(2.708) 16 counts
121Pd45+ 2.6888(2.6871) 55 counts
120Pd45+ 2.6666(2.6648) 41 counts
119Pd45+ 2.6444(2.6413)
123Pd45+ 2.7333(2.7321) 15 counts126Pd?
A/Q resolution(r.m.s): 0.07% At Z=40
Discovery of 125Pd
Cf. 124Pd 19 counts, 125Pd(cand.) 1count at GSI, 1997 PLB 415, 111 (97) total dose ~1x108
Setup for May-2007 Commissioning
Prod. Target Be 7mmtBeam-intensity monitor PL 1mmt x 3
Double AchromaticPL 0.2mmtPPAC(x,y) x2
Momentum DispersivePPAC(x,y) x2
Double AchromaticPL 0.2mmtPPAC(x,y) x2Silicon 0.33 mmt x2 for ENaI for EClover for isomeric states
Setup to search for new isotopes
B
TOF
Mom. SlitDp/p=2%(Max 6%)W/o Wedge
RIKEN Nishina Center T. Kubo (Spokesman), T. Ohnishi, K. Yoshida, A. Yoshida, K. Kusaka, N. Fukuda, M. Ohtake, Y.Yanagisawa, H. Takeda, Y. Yamaguchi, N. Aoi, K. Yoneda, H. Otsu, S. Takeuchi, D. Kameda, T. Sugimoto, Y. Kondo, K. Tanaka, H. Scheit, Y. Gono, T. Motobayashi, H.SakuraiOECU, Osaka Y. MizoiRikkyo Univ. M. MatsushitaUniv. of Tokyo H. Suzuki, T. Nakao, H. KimuraSaitama Univ. T. Kuboki, T. YamaguchiTsukuba Univ. A. Ozawa, T. Moriguchi, Y. YasudaTokyo Inst. Tech. T. Nakamura, T. Nannichi, T. Shimamura, Y. Nakayama
GSI H. Geissel, H. WeickANL J. NolenNSCL/MSU O.Tarasov, T. Nettleton, D. Bazin, B. Sherrill, D. MorrisseyGANIL W.Mittig
Collaborators
200718th June- Accelerator + BigRIPS Commissioning w/ U beam
Sept.(plan) RIBF PAC
At the beginning of Oct. ZeroDegree Commissioning
Oct.-Nov.MT for approved experiments at the first PAC
2008Prototype of new linac injector coupled with 28GHz ECR is being installed. Increase of U intensity and decouple bet. SHE and BigRIPS
Future plan
SUMMARY
PAC Feb 200719 proposals at BigRIPS/ZD, 74 % International Collaboration
Commissioning of Accelerator System and BigRIPS is going smoothly step by stepDiscovery of new isotope 125Pd
Experiments will start in this Oct.-Nov at BigRIPS/ZD.
Next PAC this Sep. http://www.nishina.riken.jp/UsersGuide
You are welcome Come to RIKEN and see what is going on.
http://www.nishina.riken.jp/