# Presentation: 008151

## Present status and future plan of

- RIKEN Nishina Center for Accelerator-Based Science

- RIBF

## RIKEN RI Beam Factory (RIBF)

**RIPS**

**GARIS**

**60~100 MeV/nucleon**

**CRIB (CNS)**

**~5 MeV/nucleon**

**350-400 MeV/nucleon**

- Old facility

- New facility

**RIKEN RI Beam Factory (RIBF)**

**BigRIPS**

**SRC**

**RILAC**

**AVF**

**RRC**

**fRC**

**IRC**

**Experiment facility**

**Accelerator**

**SHARAQ**

**SAMURAI**

**ZeroDegree**

*SLOWRI*

*SCRIT*

*RI-ring*

- SHE (eg. Z=113)

**Intense (80 kW max.) H.I. beams (up to U) of 345*****A*****MeV at SRC**
**Fast RI beams by projectile fragmentation and U-fission at BigRIPS**
**Operation since 2007**
**Phase-I SRC+BigRIPS+ZeroDegree**

*To be funded*
*In phase II*

## Progress of Research Opportunities with RI Beams 

- Progress of Research Opportunities with RI Beams

- Construction of a dedicated facility for RI beam production
- via the projectile fragmentation

- 0th-generation at LBL   1st-generation at LISE-GANIL

- 1990-

## Challenges in Methodology with fast RI beams at RIPS

**transmission method **for nuclear radii information
-     energy-dependence of total reaction cross sections, e.g. 11Be
**in-beam gamma spectroscopy** for particle bound states
-     Magicity loss at N=20
-     Anomaly of B(E2) in 16C
-         via Coulomb excitation, (p,p’), Two-step fragmentation,
-               Recoil-shadow methods, ...
**invariant mass spectroscopy** for particle unbound states
-     Large B(E1) in the halo nuclei 11Be, 19C
-     Radiative capture cross sections in stellar evolutions :7Be(p,)8B
**missing mass spectroscopy **
-     Spectroscopy on the heaviest hydrogen 7H
**polarized rare-isotope beams** for electro-magnetic moments
-     Anomaly of quadrupole moments in the B isotopes
-         via beta-NMR techniques

- ~40-70 *A* MeV and *A* < 60

## New results obtained at the old facility RIPS: 

-       C-17 and Be-12
- Phase-I programs at the new facility
- Phase-II status
- Summary

## Life-time measurements of excited states in 17C 

- D. Suzuki, et al., PLB 666 (08) 222

- 18.9 ± 0.6(stat.) ± 4.7(syst.) ps

*B*(M1; (1/2+) → 3/2+) =  (1.0±0.1) x 10-2 [μN2]
*B*(M1; (5/2+) → 3/2+) =  (8.2 +3.2/-1.8) x 10-2 [μN2]

- 583 ± 21(stat.) ± 35(syst.) ps

**3/2+**

**(1/2+)**

**(5/2+)**

**17****C**

- 18C+Be -> 17C + X

- Recoil-shadow-method

- B(E2)
- C-16  Imai et al PRL 94 (05) 199202
- C-16, 18 Ong et al. PRC 78 (08)014308

## Comparison between 17C and 21Ne 

- Comparison between 17C and 21Ne

-  (5/2+) ; Almost identical excitation energy and M1 strength
-  (1/2+) ; Low excitation energy and  small M1 strength
- ⇒ Drastic change in the structure of the 1/2+  state
- Weak binding -> 1/2+ s-wave dominant? (Yamagami, Hamamoto)
- SM : Suzuki  tensor          MF : Sagawa prolate-oblate?

## First lifetime measurement of 2+ state in 12Be

- First lifetime measurement of 2+ state in 12Be

- C

- Be

- Imai, Aoi et al. PLB, in press

- Doppler-shift attenuation method

- t = 2.5+/-0.7(stat)+/-0.3(sys) ps
- B(E2;2->0) = 5.3+/-1.3+/-0.5 (W.U.)
-                        8.2+/-2.2+/-0.8 e2fm4
-  C-14  B(E2)=1.9 W.U.
-  O-16  B(E2)=3.4 W.U.

## RIKEN RI Beam Factory (RIBF)

**RIPS**

**GARIS**

**60~100 MeV/nucleon**

**CRIB (CNS)**

**~5 MeV/nucleon**

**350-400 MeV/nucleon**

- Old facility

- New facility

**RIKEN RI Beam Factory (RIBF)**

**BigRIPS**

**SRC**

**RILAC**

**AVF**

**RRC**

**fRC**

**IRC**

**Experiment facility**

**Accelerator**

**SHARAQ**

**SAMURAI**

**ZeroDegree**

*SLOWRI*

*SCRIT*

*RI-ring*

- SHE (eg. Z=113)

**Intense (80 kW max.) H.I. beams (up to U) of 345*****A*****MeV at SRC**
**Fast RI beams by projectile fragmentation and U-fission at BigRIPS**
**Operation since 2007**

*To be funded*
*In phase II*

## 400 MeV/u Light-ion beam

**K980-MeV**** **
**Intermediate stage Ring Cyclotron (IRC)**

**World’s First and Strongest**
**K2600MeV**
**Superconducting Ring Cyclotron**

**World’s Largest Acceptance**
**9 Tm**
**Superconducting RI beam Separator**

- 345 MeV/u Uranium beam

**SRC**

**BigRIPS**

- ~250-300 MeV/nucleon RIB

## BigRIPS /ZeroDegree (Phase-I)

- BigRIPS          Fragment Separator with two stages
- 	          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

- Exploration into “Isospin Frontier” toward the drip-lines
- Reaction study fit for high energy domain  200-300A MeV

- RIB production

- PID section

## Identification of new isotopes 125,126Pd

- Identification of new isotopes 125,126Pd

- A/Q resolution(r.m.s): 0.041% at Z=46
-   B resolution (r.m.s): 0.02%
-   T resolution (r.m.s.): 40 psec

- Cf. 124Pd  19 counts, 125Pd(cand.) 1count at GSI, 1997
-  PLB 415, 111 (97); total dose ~1x1012

**126 (3counts)**

- T. Onishi et al, JPSJ 77 (08)083201.

- Total dose 3.6x1012 for 25 hrs
- I ~0.01 pnA on average

**125 (22counts)**

## ZeroDegree Commissioning, Nov., 2008

- U86+ 345A MeV+ Pb 1.5mm,   B01=7.395 Tm, No degrader
- 	_BigRIPS standard + ZDS Large Acceptance_

*Z*

*A/Q*

## Phase-I programs at BigRIPS/ZeroDegree 2007~

**              ****Ground state properties and low lying excited states **
**	****  ****via decay spectroscopy / transmission method:**
**                               ****particle stability, T****1/2****, Q********, ********R****, Ex.(2****+****)...**
**               ****Deeply bound pionic states via (d, ****3****He) 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 beams
- 	**Collectivity 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....    **
**               ****Iso-diffusion**

**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 regions**
**Specific programs with deuteron beams**

## Phase-I layout 

- Phase-I layout

- Experimental set-ups

- ZDS: Zero-Degree forward Spectrometer

******-spectroscopy**

**in-beam gamma spectroscopy**
**missing mass spectroscopy**

**total interaction cross sections**

**(d,****3****He)**

**Pol.d+p**

- ZeroDegree Spectrometer

## Summary of Achievements at BigRIPS/ZDS since 2007

- _2007_
- Feb.  	1st PAC  -> Day-One Working Group (Aoi)
-                                       to discuss Day-One programs
- March	First BigRIPS Commissioning with a Kr-86 beam
- May	BigRIPS Commissioning with a _U-238 beam (0.02pnA)_
- 		Search for New Isotopes : two new isotopes   Pd-125, 126
- June	BigRIPS Commissioning with a U-238 beam
- Sept.	2nd PAC
- _2008_
- Feb.		3rd PAC
- Nov.	ZDS Commissioning with a _U-238 beam (0.3pnA)_
- 		Search for New Isotopes : _more than 20 new isotopes, new isomers_
- 		4th PAC
- Dec.	_Day-One Experiments at BigRIPS/ZDS with a Ca-48 beam_

## DayOne Experiments with a 345 MeV/u Ca-48 Beam

-    Search for Halo Nuclei: C-22, Ne-31...
-    In-beam gamma spectroscopy for island of inversion and beyond: Ne-32 etc.
- Programs were managed Not proposal-by-proposal but RIB-by-RIB based
-       to save RIB tuning time and man-powers
-        to have the best programs according to the beam intensity and
-            secondary beam intensities (production cross sections)
- Max primary beam intensity  175 pnA
- Secondary beam intensities are one order of magnitude higher than expected.
-     Intensities/100pnA: 22C 10 cps;  30Ne 300 cps; 31Ne 10 cps; 32Ne 5 cps;  42Si 15 cps
-    Production cross sections at 345 MeV/u are by a factor of 10 larger than at ~70MeV/u(RIPS)
- Total interaction cross sections : Ne-29~32, Na-30~34
- Coulomb breakup cross sections : C-19, C-22, Ne-31
- In-beam gamma spectroscopy : Ne-32

- N. Aoi et al.

## Setup

- Experimental set-ups

- ZDS: Zero-Degree forward Spectrometer

**In-beam gamma spectroscopy**
**Coulomb breakup**
**BigRIPS+ZDS**

**total interaction cross sections**
**at BigRIPS 2****nd****-stage**

- ZeroDegree Spectrometer

- DALI-II
- NaI-based gamma Detectors

- target

- target

**T. Ohtsubo, S. Takeuchi, H. Scheit, T. Nakamura, **
**N. Aoi, H. Baba, D. Bazin, S. Deguchi, P. Doornenbal, D. Fang, M. Fukuda, N. Fukuda, H. Geissel, **
**R. Gernhaeuser, J. Gibelin, Y. Hara, Y. Hashidume, C. Hinke, N. Imai, N. Inabe, S. Ishimoto, K. Itahashi, **
**S. Itoh, N. Iwasa, T. Izumikawa, D. Kameda, S. Kanno, Y. Kawada, N. Kobayashi, T. Kobayashi, **
**Y. Kondo, T. Kroell, R. Kruecken, T. Kubo, T. Kuboki, K. Kusaka, M. Lantz, K. Li, P. Maierbeck, **
**R. Matsumiya, K. Matsuta, S. Michimasa, M. Mihara, Y. Miyashita, S. Momota, T. Moriguchi, **
**T. Motobayashi, S. Nakajima, T. Nakao, Y. Nakayama, D. Nishimura, S. Nishimura, Y. Ohkuma, **
**T. Ohnishi, M. Ohtake, N. Orr, H. Otsu, A. Ozawa, H. Sakurai, Y. Satou, T. Shimamura, Y. Shimbara, **
**S. Shimoura, T. Suda, T. Sumikama, S. Suzuki, T. Suzuki, H. Suzuki, M. Takechi, H. Takeda, **
**E. Takeshita, N. Tanaka, K. Tanaka, K. Tanaka, Y. Togano, H. Wang, R. Watanabe, Y. Watanabe, **
**M. Winkler, T. Yamaguchi, Y. Yanagisawa, K. Yoneda, A. Yoshida, K. Yoshida, K. Yoshinaga**

- DayOne experiments
- 12/09/2008 -09:00—12/21 03:00

## Year 2009-2010 Plan

-    Bypass beam line to skip IRC for AVF-RRC-SRC mode
-    _SHARAQ Commissioning with a N-14 beam_
-    _Polarized deuteron beam_ : 3NF ...
- Toward more intense beams
-    A new 18GHz ECRIS for RILAC will be installed in March, 2009
-      increase of the U beam by a factor of 10
-    Zn, Xe beam commissioning
-    R&D efforts for charge strippers
- Experimental programs with Ca, U, Xe, Ne in fall-to-winter, 2009-2010
-    _in-beam gamma, decay and missing mass spectroscopy_

## International network and collaboration

- Establishment of International Collaboration Framework
-    LIA (France), China, EMMI (Germany), JUSTIPEN (USA)
-    In near future, JUSEIPEN(USA), TRIUMF
- The State-of-Art Collaboration between Facility and Detector
-     RIBF + MUST-2 (one proposal approved at PAC,
-                                   more for a MUST-2 campaign)
-               + GRETA, AGATA (under discussion)
-               + ...

## Phase-II construction 2007-2012

**SAMURAI - large acceptance**
**      ****Kobayashi et al. **** **in 2011

**SHARAQ - high resolution**
**   ****Sakai 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 2007-2012**

- To maximize the potentials of intense RI beams available at RIBF

**RI Spin Lab. at RIPS –pol. RI beam  Ueno et al.**

** ****http://rarfaxp.riken.go.jp/RIBF-TAC05/**

- in 2009

## SAMURAI Spectrometer    Kobayashi et al   2011-

**SAMURAI Spectrometer****    ****Kobayashi et al   2011-**
- versatile spectrometer with a large superconducting magnet
- a large acceptance
-     exclusive measurements
-     neutron measurements
-     80cm gap, BL~ 7Tm, Bmax=3T
-     PID limited to A~100
- Invariant/missing mass spectroscopy
-     giant resonances
-     single particle states via (p,2p) etc
- EOS in asymmetric nuclear matter : SAMURAI-TPC
- Particle correlations in a few-body system 3NF
- Coulomb breakup for radiative capture c.s. (p,), (n,)
**Fission study**

## SCRIT  Wakasugi et al.  

- Luminosity achieved at KSR, Kyoto Univ.
-   L=2.4x1025 cm-2s-1
-    7x106 trapped ions during 85ms at 80mA current
- SCRIT project in RIKEN
-   L > 1027 cm-2s-1 80mA(KSR) -> 300mA (New e-Ring)
-   Photo-fission based ISOL for RI production

**SCRIT****  Wakasugi et al.  **
- Self-confining Radioactive Ion Target system
-     realized in an electron-ring for e-RI scattering
-   Charge form factor measurement
-  **    ***L*>1026 /cm2/s for 1 week
-            ->105 pps injection
-   Feasibility test at KSR, Kyoto-Univ.

## Budget Status and Construction Plan

- _Approved in FY08_
-    Operation for 5months
-    Facility Construction
-       SAMURAI (15M$ for FY08-11
-          magnet, detectors)
-       SHARAQ (high resolution)
-          BT line (2M$ for FY08)
- _Approved for FY09_
-    Operation for 5months+3days
-    Construction budget 15M$ for
-       SCRIT (e-RI)
-       a new linac-injector
- _FY10 and later_
-    More operation budget
-    Other facilities : RI-ring, SLOWRI

**SHARAQ**

**SAMURAI**

**ZeroDegree**

**SLOWRI**

**SCRIT**

**RI-ring**

## Summary

- Accelerator
-    Intensity of 238U is 10 times higher than in last year.
-    Beam power of 48Ca is the world highest.
-    18GHz ECRIS development completed in this March
-         In 2009, ~3 pnA for U-238
-     A new linac injector is being constructed: A few 10 pnA of U in 2010
- BigRIPS/ZDS
-  In 2007, two new isotopes of 125,126Pd; in 2008, more than 20.
-    ZDS commissioned
- Status of new facilities
-    SHARAQ in March, 2009
-    SAMURAI will be completed in 2011.
-    E-ring for SCRIT will be completed in 2010
- Experiments
-    2008, 238U beam (~0.3pnA), 48Ca beam (~100pnA)
-    2009, 3pnA U, and 400pnA Ca for spectroscopy
- PAC
-    June and December in 2009
- http://www.nishina.riken.jp

## Slide 27

## Small B(E2) values of 16,18C

- significant discrepancy
- from
- Raman’s systematics

**S. Raman *****et al*****, ADNDT 78,1(2001) **

- Small B(E2) values of 16,18C

- Ong et al. PRC 78 (08)014308

- Recoil-shadow-method
-  based on NaI

- C-16
- Re-visit at RIKEN
-             t=18+/-2+/-5 psec
- Recoil-Distance-Method
-    Wiedeking PRL100(2008)152501
-             t=12 +/-2 psec

## p-n pairing interaction for N=Z nuclei

- Z<20  T=0 S=1 pairing ?
- Z>20  T=1 S=0 pairing ?
- Z~50   dominance   ?

- N=50

- N=82

## Flag ship regions at neutron-rich side

- 238U beam

- 48Ca beam

**Neutron drip-line for F-to-Mg isotopes?**
**   **Particle stability 33F, 36Ne, 39Na, 42Mg
**p-wave halo ? : ****31****Ne ...**
**Island of inversion : deformation center at N=22?**
**   **B(E2) for 30Ne and 36Mg, etc.
**Possible deformation at N=28?**
**   **B(E2) and Ex(2+) for 42Si, 38Mg, etc.
**Oxygen beyond N=16**
**   **Ground and excited states for 25, 26O

**New isotopes between Z=20 to 60**
-    Maaaany new ones !!
**R-process path    **
**   **T1/2 at A>80
**Magicity loss at ****78****Ni ??**
-    T1/2, B(E2), Ex(2+), ...
**Magicity at N=82  ??**
-    B(E2), Ex(2+), ...
**Deformation at A~110 ??**
-     collective states

## ZeroDegree spectrometer : multi-function beam-line

- - RI-beam delivery line has been designed to work as spectrometer, in order to be used for studies of secondary reactions of exotic nuclei via inclusive/semi-exclusive measurements, such as in-beam gamma spectroscopy.
-  The same quadrupoles and dipoles as those of BigRIPS.
- - Two-bend anti-mirror symmetric system

**ZeroDegree**

- Secondary target surrounded by -ray detector array
- Missing mass detectors etc.

- T. Kubo et al.

_**(1)Achromatic large acceptance mode**_
_**total flight path length ~ 36m**_
- angular acceptance
-  =+/- 45mrad, =+/- 30mrad
- cf. 250A MeV neutron-rich beams
-    grazing angle
-     ~ 20 mrad for Pb targets
- momentum acceptance
-  p/p =+/- 3%
- momentum resolution
-   (x,p)/(x,x) = 1240
- maximum magnetic rigidity  7.3 Tm
**5 sigma separation in A at A=200**

## Great expansion of nuclear world by RIBFIntensity > 1 particle/day(EPAX@GSI) 

- Exploration of the Limit of Existence

## Slide 33

## Hamamoto

## 23 New Isotopes 

- 23 New Isotopes
-  Nov. 2008 run

## Year 2009 Plan

-    Bypass beam line to skip IRC for AVF-RRC-SRC mode
-    SHARAQ Commissioning in March
-    Experimental programs with deuteron beams and light ion beams
- Toward more intense beams
-    A new 28GHz ECRIS for RILAC will be installed in March, 2009
-      increase of the U beam by a factor of 10
-    Xe beam commissioning at 345MeV/u
-    R&D efforts for charge strippers
- Experimental programs with Ca, Kr, Xe and U

## Achievements and Commissioning in 2008

-    A problem of carry-over oil in the liq. He refrigerators of
-    the SRC and BigRIPS cryogenic system
-    Feb.-Sept. to clean up the system and to install additional oil-filters
- May-June
-    Accelerator Commissioning up to IRC, by additional installation of
-    beam diagnostic monitors
-             48Ca, 114 MeV/u and 270 pnA
-         238U,  114 MeV/u and 0.35 pnA (max)
-                                           (10 times higher than in 2007)
-    Test of charge stripper at exit of RILAC with a Xe beam
- November, 238U beam at 345 MeV/u and ~0.3 pnA (max)!!!!!
-     ZeroDegree Commissioning + Search for New Isotopes
- December, 48Ca beam at 345 MeV/u and >100 pnA
-     Search for Halo Nuclei
-     In-beam gamma spectroscopy for island of inversion and beyond

## RIKEN, U. Tokyo, Osaka ECU, Rikkyo U., Saitama U, Tsukuba U., TITech

- GSI, ANL, NSCL, JINR, GANIL

## Achievements and Commissioning Runs in 2007

-   12th    86Kr31+ beam at 345 MeV/u  several pnA.
-   13th   	First Production of RI beams with 86Kr beam
-   23rd     238U86+ beam at 345 MeV/u  0.002pnA
-   27th 	First production of RI beams with 238U beam
- May 16th-June 3rd with 238U beam at 345 MeV/u and ~0.03 pnA max
-              Optics with primary beam and secondary beam
-              Reconstruction, Detector performances, etc
-              Rough yield measurements w/ Be and Pb targets
- 	Search for New Isotopes (Kubo et al) (5days)
- June 29th-July 2nd, with 238U beam
- 	Detector tests (IC, NaI), etc
-              Yield survey for 80Zn, 130Cd, etc

## RIBFAcceleration performance 

**Performance of RIKEN Accelerator Complex**

## New isotopes of 125, 126Pd

- _New isotopes of __125, 126__Pd_

- 238U + Be(7mm) at 345 MeV/u

- 2007 MAY-JUNE

- Isomer 96Rb

- Bρ: 7.438 Tm, ΔP/P=2%

- T. Onishi et al, JPSJ 77 (08)083201.

## Basic parameters of BigRIPS

**         ****First stage****	****	****     Two bends**
**         ****Second stage****	****     Four bends**
**Energy degrader****	****Achromatic wedge**
**Quadrupoles****	****	****Superconducting**
**Angular acceptance**
**         ****Horizontal****	****	****      80 mr**
**         ****Vertical****	****	****    100 mr**
**Momentum acceptance****	****         6 %**
**Max. magnetic rigidity****	****         9 Tm**
**Total length****	****	****       77 m**
**Momentum dispersion***
**          ****First stage****	****	****    -2.31 m**
**          ****Second stage****	****       3.3 m**
**Momentum resolution**(1****st**** order)**
**          ****First stage****	****	****       1290**
**          ****Second stage*******	****       3300**

- *   At the mid-focus of the stage.
- ** Those in the case when a 1 mm beam spot is assumed.

- In-flight fission of 238U 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 Tm
- Angular acceptance Horizontal = +/-45 mrad, Vertical = +/-30 mard
- Momentum acceptance = +/-3  %
- Momentum dispersion = 2.24 cm/%
- Momentum resolution = (X,P)/(X,X) =1240

- (II) Achromatic: High resolution mode

- Maximum magnetic rigidity = 9.0 Tm
- Angular acceptance Horizontal = +/-20 mrad, Vertical = +/-30 mard
- Momentum acceptance = +/-3 %
- Momentum dispersion = 2.12 cm/%
- Momentum resolution = (X,P)/(X,X) = 2120

- (III) Dispersive spectrometer mode

- Maximum magnetic rigidity = 9.0 Tm
- Angular acceptance Horizontal = +/-20 mrad, Vertical = +/-30 mard
- Momentum acceptance = +/-2 %
- Momentum dispersion = 4.13 cm/%
- Momentum resolution = (X,P)/(X,X) = 4130

- (IV) Transmission mode

## Flag ship regions at neutron-rich side

- 238U beam

- 48Ca beam

**Neutron drip-line for F-to-Mg isotopes?**
**   **Particle stability 33F, 36Ne, 39Na, 42Mg
**p-wave halo ? : ****31****Ne ...**
**Island of inversion : deformation center at N=22?**
**   **B(E2) for 30Ne and 36Mg, etc.
**Possible deformation at N=28?**
**   **B(E2) and Ex(2+) for 42Si, 38Mg, etc.
**Oxygen beyond N=16**
**   **Ground and excited states for 24,25, 26O

**New isotopes between Z=20 to 60**
-    Maaaany new ones !!
**R-process path    **
**   **T1/2 at A>80
**New magicity at ****54****Ca ??**
-    B(E2), Ex(2+), ...
**Magicity loss at ****78****Ni ??**
-    T1/2, B(E2), Ex(2+), ...
**Magicity at N=82  ??**
-    B(E2), Ex(2+), ...
**Deformation at A~110 ??**
-     collective states

## Flag ship regions at proton-rich side

- 124Xe beam

- 78Kr beam

- New isotopes, Proton-drip line ?
- Double magicity at 100Sn ?
- 2p decay
- rp- process

## R&D: Detectors/Targets for Phase-I programs

**Particle identification and beam monitoring at high rate**
-     Gas counters with high rate capability at ~106 /sec
-         delay-line PPAC and MUSIC
**Targets**
-     Liquid hydrogen/helium targets for in-beam gamma and invariant mass
- 	thickness 100-250 mg/cm2
-     Window-less solid hydrogen target for missing mass (p,p), (p,p’)
-               thickness 3mm -> 1mm (goal)
**    ****Polarized proton target**
**Gamma detectors for fast RI beams (v/c ~ 0.6)**
-      DALI-2   NaI-based ball    19% eff. for 1MeV gamma, 12% resolution
-      GRAPE   Ge-based ball       3% eff. for 1MeV gamma, 1.5% resolution
**beta-spectroscopy**
-      Cylindrical active implantation target dedicated to half-life measurements
-      Double-sided silicon strip detectors as active implantations
**missing mass spectroscopy**
-      Recoiled-out proton detectors for proton elastic scattering
-      Spectrometer for recoiled-out protons emitted at 0 degree

## RI beam intensities at BigRIPS for first two years 2008-2009

**RI beam intensities at BigRIPS for first two years 2008-2009**

- Primary beam energy  350AMeV
- 	48Ca (200pnA), 86Kr (100pnA),136Xe (10pnA), 238U(2pnA)
- Secondary beam energy ~250A MeV
- Cross sections  Fragmentation EPAX-II
- 	         Fission  GSI-data (U+Be), ABRABLA (Coulomb)

## Comparison with B(E2) values from microscopic models

**Comparison with B(E2) values from microscopic models**

- Skyrme HF
-   Sagawa et al., PRC70, 054316(04)

- AMD
-   Kanada-En’yo, PRC 71, 014310 (05)

- AMD+MSD
-   Thiamova et al., EPJA 22, 461(04)

- Shell model
-   Fujimoto, Thesis, UT, 2003

- “No core” shell model
-   Fujii et al., PLB 650, 9 (07)

- In the shell models,
-      larger sub-shell gap for protons; 0p3/2 - 0p1/2
-      smaller effective charge  *e**n** ~ *0.2*e*
-         due to s-wave dominance and week-bound neutrons

## s-wave dominance in the 1/2+  state? 

-  3/2+ ; the [d5/2×2+]3/2+ configuration is dominant.
- ⇒ The 1/2+ state of 17C may have  a large amount of
-      the [s1/2×0+]1/2+ configuration
-      since the M1 transition between the s1/2 and d5/2 orbitals
-      is forbidden.
-    The 1/2+ state of 17C may be a halo state ?.

## Excited states in even-even C isotopes

- GANIL, Eur. Phys. J.A 20, 95 (04)

- N=8

- N=10

- N=12

- N=14

- B(E2)?

**N=8 gap**
**Z=6 gap**

- 2934

- 4184

- 14C double magic ??

## Excited states in the odd C and O isotopes

- Z.Elekes et al., PLB 614 (05) 174
-   tentative spin assignments

- s1/2

- s1/2

- d5/2

- d5/2

- neutron-dominant collective states??

- d5/2-s1/2-(d3/2)

- N=7

- N=11

- N=9

- N=13

- GANIL, PRC69,034312(2004)

## Delivery of tagged RI-beam

- To RI-beam delivery line & experimental set-ups

- Based on two-stage separator scheme

**Cocktail beam **A, Z, Q mixed

**Tagged beam   **

**Identify RI-beam species Z, A/Q by measuring ********E, B********, TOF ****in an event-by-event mode using beam-line detectors on the 2nd stage.**        Aim at tagging rate up to 1 x 106 pps.

**B******measurement

**TOF& ********E **

- Dispersive focus

- T. Kubo et al.

- total reaction cross section measurement with 2nd stage
-     2ndary target placed at F5