Advances in Nuclear Physics Research at RIKEN's RIBF Facility

Cutting-edge research at RIKEN's Radioactive Isotope Beam Factory (RIBF) in collaboration with the University of Tokyo, focusing on gamma-ray spectroscopy setups, in-beam experiments, and detector arrays like DALI2. The experiments involve studying reaction channels, Doppler shift effects, and exploring isotopes in the context of nuclear structure and collectivity. Key findings include observations in 32Ne, 31Na, 33Na, and more nuclei, shedding light on the landscape of nuclear physics research.

• Nuclear Physics
• RIKEN
• RIBF
• Gamma-ray Spectroscopy
• Isotope Research

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1. Sep 24. 2012 RIBF RIBF CNS, Univ. of Tokyo MATSUSHITA Masafumi

3. -ray Spectroscopy Setup at RIBF Experiments by means of in-beam ray spectroscopy.

4. -ray Spectroscopy Setup at BigRIPS / ZDS PID of projectile particles PID of ejectile particles Observables: velocity emission angle -ray energy Determine reaction channel and correct Doppler shift effects.

5. DALI2 for RIBF Experiments Detector Array for Low Intensity radiation Standard specification Arrangement Hedgehog like Size (cm3) 4.5 x 8 x 16 # of Detectors 160 Volume ~ 90 liter # of Layers 16 Angular resolution ~ 8 degree Energy resolution ( ~0.6) 10% @ 1MeV 20% @1MeV (24%@1MeV ( ~0.3)) Efficiency ( ~0.6) Timing resolution ~ 2.5ns (FWHM) -ray energy Emission angle of ray For Doppler-shift corrections Ref. S.Takeuchi et al., RIKEN Accel. Prog. Rep. 36(2003)148 Ex.) S.Takeuchi et al., PRC 79, 054319 (2009)

6. In-beam -ray spectroscopy at RIBF 2008 DayOne 32Ne, 31,33Na H. Scheit, P. Doornenbal PRL 103:032501, 2009./PRC 81:041305, 2010. Test with U (0.3-0.6 pnA) ~132Sn H. Wang, N. Aoi 2009 2010 48Ca campaign 38,40,42Si A>36Mg F isotopes ~Al, P 33Mg 40Mg test S. Takeuchi, M.Matsushita submitted to PRL P. Doornenbal, H. Scheit in preparation P. Doornenbal D. Steppenbeck D. Bazin P. Fallon in preparation in preparation 2011 U beam campaign 78Ni ~132Sn K. Yoneda, D. Steppenbeck H. Wang, N. Aoi 2012 124Xe and 70Zn beam campaign 10xSn 54Ca A. Obertelli, P. Doornenbal D. Steppenbeck, S. Takeuchi

7. Landscape on and around Island of inversion Deformed (R42) Large collectivity (B(E2)) Large collectivity (Ex(2+))

8. 2+state in 32Ne - DayONE experiment (2008) -

9. 2+state in 32Ne - DayONE experiment (2008) -

10. Landscape on and around Island of inversion Deformed (R42) Large collectivity (B(E2)) Large collectivity (Ex(2+))

11. Spectroscopy of 36,38Mg P.Doornenbal et al

12. Landscape on and around Island of inversion Deformed (R42) Large collectivity (B(E2)) Large collectivity (Ex(2+))

13. What we know about 42Si Inconsistent results between two-proton removal reactions, 44S 42Si S.Takeuchi, M.M et al., submitted to PRL. NSCL case A substantial Z=14 subshell closure J.Fridmann et al., Phys. Rev. C 74, 034313 (2006) Z=14 A GANIL case Well-deformed oblate rotor B.Bastin et al., Phys. Rev. Lett. 99, 022503 (2007). ? R(4/2) (4+) ? Ex (MeV) 2+ N Re-visit 42Si to confirm the 2+excitation energy Determine the location of the 4+state in 42Si (and other Si isotopes)

14. 42Si : 2+peak with high statistics GANIL exp. : 770(19) keV B.Bastin et al., Phys. Rev. Lett. 99, 022503 (2007). 44S + C 42Si + + X We confirmed line observed at GANIL. ray (2+ 0+): 742(8) keV new lines: 1431(11) keV 2032(9) keV 2357(15) keV *Widths are fixed to simulated values.

15. 42Si : 2+peak with high statistics 44S + C 42Si + + X 4+ 2239 keV 2+ 742 keV g.s. 42Si *Widths are fixed to simulated values. Excited state at 2173(14) keV has been tentatively assigned to the 4+state from present study.

16. Other isotopes : 38,40Si 40Si 38Si

17. Other isotopes : 38,40Si 2524 keV 4+ 2355 keV 4+ 2239 keV 1614 keV 2+ 1071 keV 985 keV 2+ g.s. g.s. 40Si 38Si Ex(4+)/Ex(2+) = 2.09 Ex(4+)/Ex(2+) = 2.56

18. Systematic in Si isotopes Present exp. Low 2+excitation energy R(4/2) = 2.93: well deformed Development of deformation toward N=28 indicate disappearance of N=28 -- without tensor force with tensor force T.Otsuka et al., NPA 805 (2008) 127c Y.Utsuno et al., arXiv/1201.4077 (2012)

19. Landscape on and around Island of inversion Deformed (R42) Large collectivity (B(E2)) Large collectivity (Ex(2+))

20. Collaborators RIKEN: S.TAKEUCHI, N.AOI, P.DOORNENBAL, J.LEE, L.KUOANG, H.SCHEIT, D.STEPPENBECK, H.WANG, T.MOTOBAYASHI, H.SAKURAI, H.BABA, M.TAKECHI, Y.TOGANO, K.YONEDA, M.MATSUSHITA N.KOBAYASHI, G.LEE, Y.KONDO, T.NAKAMURA, T.SAKO, K.TAKAHASHI S.GO, E.IDEGUCHI, S.MICHIMASA, S.OTA, S.SHIMOURA R.GERNHAEUSER, C.HINKE, R.KRUCKEN, K.STEIGER C.HOFFMAN L.CACERES T.L.BLEIS S.GREVY, A.MATTA H.CRAWFORD, P.FALLON, M.PETRI, J.GIBELIN D.BAZIN, R.WINKLER R.HUGHES D.JENKINS TITech: CNS: TU M nchen: ANL: GANIL: Frankfurt/GSI: IN2P3: LBNL: LPC CAEN: NSCL: RICHMOND: YORK: THANK YOU FOR YOUR ATTENTION