Nuclear Structure Studies at Beihang University (Collaboration with - PowerPoint PPT Presentation

Nuclear Structure Studies at Beihang University (Collaboration with RCNP) Isao Tanihata School of Physics and Nuclear Energy Engineering Beihang University and International Research Center for Nuclei and Particles in Cosmos 15 年 11 月 12 日木曜日

School of Physics and Nuclear Energy Engineering Physics Subjects at Beihang 12 C+ 12 C elastic scattering and an effect of repulsive ✦ three-body interaction ✦ Study of tensor forces in nuclei ✦ Spectroscopy at RIBF ✦ Determination of proton distribution radii of neutron rich nuclei ✦ Charge exchange reaction of neutron-rich C isotopes 15 年 11 月 12 日木曜日

Study of Repulsive three-body interactions 12 C+ 12 C Optical potential with phenomenological repulsive three-body interactions in heavy-ion collision (G.L. Zhang G.) T. Furumoto, Y. Sakuragi, and Y. Yamamoto, Phys. Rev. C 82 (2010) 044612. 15 年 11 月 12 日木曜日

12 C+ 12 C Optical potential with phenomenological repulsive three-body interactions T. Furumoto, Y. Sakuragi, and Y. Yamamoto, Phys. Rev. C 82 (2010) 044612. 15 年 11 月 12 日木曜日

The result at 100 A MeV The angular distribution is better reproduced by the introduction of three-body repulsion. without TBI CEG07b model with TBI Multi-Pomeron exchange potential with TBI W.W. Qu, G.L. Zhang, S. Terashima,... T. Furumoto, Y. Yamamoto, H. Sakuragi et al., Phys. Lett. B 751 (2015) 1. 15 年 11 月 12 日木曜日

Effects of Tensor Forces in Nuclei (S. Terashima G.) Please refer to the talk of S. Terashima 5 15 年 11 月 12 日木曜日

Pd 128 H. Watanabe et. al., Spectroscopy of neutron rich nuclei Seniority isomer Phys. Rev. Lett. 111, 46 82 152501 (2013) at RIBF (H. Watanabe G) Delayed coin. with 128 Pd ions (Δt=0.15-25 μs) γ-γ coincidence with a gate on 1311 keV 128 Pd 82 15 年 11 月 12 日木曜日

Pd 128 H. Watanabe et. al., Seniority isomer Phys. Rev. Lett. 111, 46 82 152501 (2013) Delayed coin. with 128 Pd ions (Δt=0.15-25 μs) γ-γ coincidence with a gate on 1311 keV 128 Pd 82 15 年 11 月 12 日木曜日

Pd 128 H. Watanabe et. al., Seniority isomer Phys. Rev. Lett. 111, 46 82 152501 (2013) Delayed coin. with 128 Pd ions (Δt=0.15-25 μs) γ-γ coincidence with a gate on 1311 keV A.Jungclaus et al., PRL 99, 128 Pd 82 130 Cd 82 132501 (2007) 15 年 11 月 12 日木曜日

Pd 128 H. Watanabe et. al., Seniority isomer Phys. Rev. Lett. 111, 46 82 152501 (2013) Delayed coin. with 128 Pd ions (Δt=0.15-25 μs) γ-γ coincidence with a gate on 1311 keV B(E2;8 + →6 + ) Seniority ( ν ) scheme A.Jungclaus et al., PRL 99, 128 Pd 82 130 Cd 82 132501 (2007) 15 年 11 月 12 日木曜日

Pd 128 H. Watanabe et. al., Seniority isomer Phys. Rev. Lett. 111, 46 82 152501 (2013) Delayed coin. with 128 Pd ions (Δt=0.15-25 μs) γ-γ coincidence with a gate on 1311 keV B(E2;8 + →6 + ) Seniority ( ν ) scheme A.Jungclaus et al., PRL 99, 128 Pd 82 130 Cd 82 132501 (2007) Good ν =2 in the well isolated π g 9/2 subshell Robust shell closure at N=82 15 年 11 月 12 日木曜日

Pd Decay schemes of the (10+) isomer and the ground state 126 46 80 H. Watanabe et. al., PRL 113, 042502 (2014) Long-lived isomer ✦ E x = 2406 keV 126 Pd 80 ✦ T 1/2 = 23.0(8) ms ✦ J π = (10 + ) 7 - : ν (h 11/2 -1 d 3/2 -1 ) R int = 26(8) % 10 + : ν (h 11/2 ) -2 B(E3) = 0.07(2) W.u. 126 Ag 79 T 1/2 average ★ 20.4(13) ms ★ 25.1(10) ms ★ 48.6(8) ms 15 年 11 月 12 日木曜日

Measurement of charge changing First CCCS Experiment at ETF ��������� cross sections(CCCS) and proton radii ① Low energy site in general of neutron rich nuclei (B.-H. Sun G.) ② Atomic physics & nuclear astrophysics ③ SHANS - Spectrometer for Heavy Atom and Nuclear Structure ④ Heavy ion irradiation exp. site ⑤ RIBLL1 – 1st Radioactive Ion Beam Line in Lanzhou 10 ECR ⑥ ETF – External Target Facility ⑦ CSRe – Experimental Ring ⑧ PISA ⑨ Tumor therapy site 8 10 micro-beam 15 年 11 月 12 日木曜日

First CCCS Experiment at ETF ��������� ① Low energy site in general ② Atomic physics & nuclear astrophysics ③ SHANS - Spectrometer for Heavy Atom and Nuclear Structure ④ Heavy ion irradiation exp. site ⑤ RIBLL1 – 1st Radioactive Ion Beam Line in Lanzhou 10 ECR ⑥ ETF – External Target Facility ⑦ CSRe – Experimental Ring ⑧ PISA ⑨ Tumor therapy site 8 10 micro-beam 15 年 11 月 12 日木曜日

Experiment setup Slow extraction from CSRm RIBLL2&(F0*F2)&+&ET& Primary beam: 18O at 400 A MeV 18 O +CCCS Target: C(15 mm), Pb(3mm) + TOF-B ρ -dE for PID of RIBs +Plastic, Si for Z-identification +Beam tracking with MWPCs ! � N !" ! ! !! = 1 ! !" Γ � 1 ! !" N !"# ! ! Γ N !"# � N !" B.H. Sun(spokesperson) I. Tanihata (co-spokesperson) Experiment&@&IMP:&~&Jan.&24*28&2015 9 15 年 11 月 12 日木曜日

CCCS measurements (Step 1) 4 different B ρ setting during ~ 4 days beam time colour coded from ADNDT99(2013)69 Setting @ 2014.01.20 ★ : Identified in this work 10 New experiment scheduled around Jan. 2016 at IMP 15 年 11 月 12 日木曜日

Sample data from 16 N setting Particle identification spectrum Z-identification after target 16 N on C target 1800 16 N 2500 1600 2000 15 N 14 C dE (a.u.) 1400 1500 Si1 13 C 12 B 1200 1000 1000 11 B 500 800 0 120 121 122 123 124 125 126 127 128 129 130 0 500 1000 1500 2000 2500 TOF (ns) Si2 + above plastic scintillator is used for dE + Pileup rejection by: (1) Pile-up detection circuit. (2) Veto scintillator (3) Multi-hit TDC B.H. Sun, et al. Z 11 15 年 11 月 12 日木曜日

High performance detector development Ultra-high precision detector development for mass measurements and else.. (NSFC ����5���5��� ����.��.�������5��/������������5.�����50������������5�������������1� key project) ���.���.����.�/���1.������5������.�����������.5.�0���/��.�.����1�5��.���.)���� 500 MeV/u Fe at HIMAC TDC � TAC+ADC � J.W. Zhao, B.H. Sun, et al. (�����//.�.5���������1.��/������.���50����������5��.�������5����5����������� ��.��5��.�.����.5��� a-ray B.H. Sun, et al. I. Tanihata, et al. ! 1 12 15 年 11 月 12 日木曜日

Ultra-high precision detector development ����5���5��� ����.��.�������5��/������������5.�����50������������5�������������1� ���.���.����.�/���1.������5������.�����������.5.�0���/��.�.����1�5��.���.)���� 500 MeV/u Fe at HIMAC TDC � TAC+ADC � J.W. Zhao, B.H. Sun, et al. (�����//.�.5���������1.��/������.���50����������5��.�������5����5����������� ��.��5��.�.����.5��� a-ray B.H. Sun, et al. I. Tanihata, et al. ! 1 12 15 年 11 月 12 日木曜日

Charge Exchange Reactions of Neutron Rich Nuclei (GSI coll. G.) New subject! (p, n), ( 3 He,t) reactions (charge exchange: Cex) at intermediate energy have been used to study Fermi and Gamow-Teller strength complementary with β -decay measurements. Cex reactions of neutron rich nuclei will give information on Fermi and Gamow-Teller strength for nuclei far from the stability line. 13 15 年 11 月 12 日木曜日

Relation between Cex cross section ( σ ) and β -decay strength ( B (GT), B (F)) σ = ˆ σ i F i ( q , ω ) B ( i ) σ F ~ 1/10 σ GT Unit cross section form factor=1 ( q, ω )= (0,0) 2 (GT) = K 2 B (F) + G A G V ft R = ( G A /G V ) 2 = 1.56 ± 0.2 and K/(G V ) 2 = 6163 ± 4 s. (p,n) β -decay measurement become difficult β decay and (p,n) Tadeucchi et al., Nucl. Phys. 469 (1987) 125. 14 M. Sasano et al., Phys. Rev. C 79 (2009) 024602. 15 年 11 月 12 日木曜日

Experiment with C isotopes ( A =12-19) A C + p -> A ’ N inclusive at 0 degrees A C + p -> A +1 N A C + p -> A N + n A C + p -> A N * + n -> A-x N + n + x n A C + p -> A N * + n -> A-y (7-y) + n + y p 15 15 年 11 月 12 日木曜日

Experiment with C isotopes ( A =12-19) A C + p -> A ’ N inclusive at 0 degrees A C + p -> A +1 N A C + p -> A N + n A C + p -> A N * + n -> A-x N + n + x n A C + p -> A N * + n -> A-y (7-y) + n + y p 15 15 年 11 月 12 日木曜日

Energetics of Transitions A-1 M - M =0.782 MeV n C+n H A-1 C+p S (C) n S (N) p A C A-1 N+n Q β S (N) n S n : neutron separation energy S p : proton separation energy S n < S p for neutron rich nuclei A N For R-process nuclei: S n ~ 1-2 MeV The window of Cex reaction is almost the same as β -decay window. 16 15 年 11 月 12 日木曜日

Measurements Fig. 2 Experimental setup. Sci: plastic scintillation detector, TPC: time-projection chamber, MUSIC: multi-sampling ion chamber. 17 15 年 11 月 12 日木曜日