質量数30-40,100領域の高スピン変形状態の研究
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1 質量数 30-40,100 領域の高スピン 変形状態の研究 井手口栄治東大 CNS
2 Outline 重イオンビームを用いて行ってきた高スピン状態のこれまでの研究と今後の計画 質量数 100 領域の高スピン状態 107 In の高スピン状態の研究 質量数 領域の高スピン状態 40 Ca の高スピン状態 今後の研究計画 A~110 領域の高スピン状態 A~30-40 領域の高スピン状態
3 107 In の高スピン状態
4 Collaborators B.Cederwall A,E.Ganioglu A,F,B.Hadinia A,K.Lagergren A, T.Bäck A,S.Eeckhaudt B,T.Grahn B,P.Greenlees B, A.Johnson A,D.T.Joss C,R.Julin B,S.Juutinen B, H.Kettunen B,M.Leino B,A.-P.Leppanen B,P.Nieminen B, M.Nyman B,J.Pakarinen B,E.S.Paul D,P.Rahkila B, C.Scholey B,J.Uusitalo B,R.Wadsworth E,D.R.Wiseman D, R.Wyss A A. Department of Physics, Royal Institute of Technology, Sweden B. Department of Physics, University of Jyväskylä, Finland C. CCLRC Daresbury Laboratory, UK D. Oliver Lodge Laboratory, University of Liverpool, UK E. Department of Physics, University of York, UK F. Department of Physics, Faculty of Science, Istanbul University,
5 質量数 ~100 Z~50 領域の原子核 基底状態近傍は単一粒子励起 高スピン準位 M1バンド πg -1 9/2 νg 7/2 Multi particle-hole excitation Intruder バンド πh 11/2 の寄与 ( 変形 高スピン ) Smooth band termination 108 Sn, 109 Sb, In 同位体での高スピン状態はあまり良く知られていない Z<50 核 ( 107 In) で πh 11/2 intruder orbital の寄与は? in-beam γ 線分光による 107 In の高スピン状態の探索
6 Experimental Setup University of Jyväskylä JUROGAM 43 Ge+BGO + RITU Gas filled Ion Sep. +GREAT spectrometer GREAT: Double sided Si strip Si PIN photodiode array Double sided planar Ge Segmented Clover Ge
7 Study of 107 In (Z=49, N=58) Reaction : 52 Cr(187MeV) + 58 Ni( μg/cm 2 ) B. Hadinia et al. PRC70, (2004) Xe 109 Xe 110 Xe 111 Xe 112 Xe 107 I 108 I 109 I 110 I 111 I 103 Te 104 Te 105 Te 106 Te 107 Te 108 Te 109 Te 110 Te 102 Sb Sb 104 Sb 105 Sb 106 Sb 107 Sb 108 Sb 109 Sb Sn Sn Sn 103 Sn 104 Sn 105 Sn 106 Sn 107 Sn 108 Sn In 99 In In 101 In 102 In 103 In 104 In 105 In 106 In 107 In Cd 98 Cd 99 Cd Cd 101 Cd 102 Cd 103 Cd 104 Cd 105 Cd 106 Cd Ag 97 Ag 98 Ag 99 Ag Ag 101 Ag 102 Ag 103 Ag 104 Ag 105 Ag Pd 96 Pd 97 Pd 98 Pd 99 Pd Pd 101 Pd 102 Pd 103 Pd 104 Pd Ni( 52 Cr, 3p) 107 In 99.9%< ε + β 90%< ε + β99.9% 0.1% α < 10% 10% 0 ε + β9% 10% 9 α 0% 0.1% 10 ε + β% 90%< α 99.9 % 99.9%< α 99.9%< p + α
8 107 In level scheme S.K. Tandel et al. PRC58, 3738 (1998)
9 A rotational band in 107 In (1972) Sum of 514,823,1053,1386,1573,1786 kev gate
10 Linking transitions
11 角度分布
12 Total Routhian Surface Calculation A conf. (+,+1/2) B conf.(+,-1/2) E conf.(-,-1/2)
13 J (1),J (2) moment of inertia Exp. and TRS calc. Kinematical J (1) 2 = h 2 de( I) 2 d( I ) 1 = h I ω J Dynamical 1 = h 2 d E( I 2 di ( 2) ) 2 1 = h di dω
14 40 Ca の高スピン状態
15 Collaborators E. Ideguchi A, D. G. Sarantites B, W. Reviol B, C. J. Chiara B, M. Devlin B, F. Lerma B, R.V. F. Janssens C, M. P. Carpenter C, T. Lauritsen C, C. J. Lister C,P. Reiter C,D. Seweryniak C, C. Baktash D, A. Galindo-Uribarri D, D. Rudolph E, A. Axelsson F, M. Weiszflog F, D. R. LaFosse G, J. N. Wilson B, H. Madokoro H A. CNS, the University of Tokyo B. Chemistry Department, Washington University C. Physics Division, Argonne National Laboratory D. Physics Division, Oak Ridge National Laboratory E. Department of Physics, Lund University F. The Svedberg Laboratory and Department of Radiation Science, Uppsala University, G. Department of Physics and Astronomy, SUNY-Stony Brook H. The Institute of Physical and Chemical Research (RIKEN)
16
17
18 High-spin states in 40 Ca 1α 2α J.L. Wood et al, Phys. Rep. 215 (1992)101
19 SD band in 40 Ca 20 Ne + 28 Si 2α + 40 Ca ATLAS accelerator at ANL Beam: 20 Ne 84MeV (80MeV after Ta foil) Target: 0.45 mg/cm 228 Si on 1mg/cm 2 Ta Gammasphere (101Ge) + Microball (95 CsI(Tl)) ε(p)=60%, ε(α)=47%
20 25
21 known excited states of 40 Ca 3737 J.L.Wood et al., Phy.Rep.215(1992)101
22 3 0+
23 A: B:
24
25 Cranked Relativistic Mean Field Calculation (preliminary results) Negative parity band : odd number of particle in f 7/2 orbital Signature α= 0 band (A, B) [200]1/2 α=-1/2 [321]3/2 α=-1/2 : conf.1 [200]1/2 α= +1/2 [321]3/2 α= +1/2 : conf.2 Signature α= 1 band (C) [200]1/2 α=-1/2 [321]3/2 α= +1/2 : conf. 3 [200]1/2 α= +1/2 [321]3/2 α=-1/2 : conf. 4 π3 3 υ3 2, π3 3 υ3 4
26 CRMF: π3 3 υ3 4 configuration
27 CRMF: π3 3 υ3 2 configuration
28 Level scheme of 40 Ca is extended to 17 - at 23.5MeV Three negative parity bands in 40 Ca Angular distribution Spin assignments Residual Doppler shift analysis Qt(band A) = 0.90 ± 0.17eb, β 2 = 0.32 ± 0.06 Qt(band C) = 0.53 ± 0.13eb, β 2 = 0.20 ± 0.05 Cranked Relativistic Mean Field calculation in progress π3 3 ν3 2, π3 3 ν3 4 configurations
29 今後の研究計画 A~110 領域の高スピン状態 高スピンの極限 変形の極限 A~30-40 領域の高スピン状態 未開拓の SD 領域
30 A~110 領域の高スピン状態の研究 R.R.Chasman PRC64,024311(2001) Predicted New SD region Cranked Strutinsky calculations Z=40~54 N=56~68
31 Limit of deformation 2 2 x 1 Q0 = ZR 10 2/3 5 x 2 2 eb x : major-to-minor axis ratio x = 2 2:1deformation Q 2 / 5ZR 0 = R = 1.2A 1/3 fm R.M.Clark et al., Phys. Rev. Lett. 87, (2001)
32 1/2[431] 3/2[431] i 13/2 intruder orbital s 1/2 2d 3/2 1h 11/2 2d 5/2 Es.p. (h ) 7/2[503] 1/2[660] 1/2[400] 3/2[402] 3/2[761] 3/2[642] 5/2[402] 7/2[404] 7/2[633] 3/2[521] 11/2[615] 1/2[640] 1/2[770] 3/2[651] 3/2[532] 5/2[523] 7/2[514] 7/2[633] 5/2[642] 3/2[651] 9/2[505] 13/2[606] 1/2[660] 1/2[400] 1/2[651] 11/2[505] 5/2[642] 1/2[411] 9/2[514] 3/2[402] 1/2[530] 7/2[404] 5/2[402] 1/2[550] 3/2[541] 5/2[532] 1/2[411] 1/2[411] 7/2[523] 7/2[523] 9/2[514] 1/2[420] 3/2[411] 3/2[411] 3/2[411] 5/2[413] 3/2[422] g 7/2 3/2[422] 5/2[413] 1/2[420] 1/2[431] 7/2[404] 50 3/2[541] 5/2[303] 1g 9/2 3/2[301] /2[651] 1/2[660] 1/2[541] 3/2[541] 1/2[550] 11/2[505] 5/2[532] 1/2[301] 5/2[303] 1/2[541] 1/2[301] 5/2[532] i 13/2 proton Intruder Occupied in 108 Cd 3/2[301] 9/2[404] 1/2[301] 7/2[413] 1/2[440] 1/2[301] 5/2[422] 5/2[422] 1/2[550] 3/2[431] 7/2[413] C-T. Lee et al., PRC 65, (2002)
33 A~110 の高スピン原子核の生成 100 Ru: 96 Zr( 13 C, α5n) 106 Pd: 96 Zr( 13 C, 3n), 96 Zr( 18 O, α4n) 110 Cd: 96 Zr( 22 Ne, α4n) 114 Sn: 100 Mo( 22 Ne, α4n) 118 Te: 100 Mo( 22 Ne, 4n) 122 Xe: 110 Pd( 18 O, 6n)
34 A~40 領域の超変形状態の探索 40 Ca I > 16ħ Backbending around 20ħ? 36 S (Z=16, N=20), 32 S(Z=N=16) 40 Ar (Z=18, N=22) 36 Ar (Z=18, N=18) Ribeamを用いた高スピン分光 50 Ti(Z=22,N=28), 48 Ca(Z=20,N=28) C.E. Svensson et al., PRL85,2693 (2000)
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2010 KEK (Japan) (Japan) (Japan) Cheoun, Myun -ki Soongsil (Korea) Ryu,, Chung-Yoe Soongsil (Korea) 1. S.Reddy, M.Prakash and J.M. Lattimer, P.R.D58 #013009 (1998) Magnetar : ~ 10 15 G ~ 10 17 19 G (?)
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