贺创业-原子能院-年终总结模板.ppt

Company Logo Company LOGO Quest for chirality in 107Ag He Chuangye 第十三届全国核结构研讨会 赤峰 2010.7.25-31 outline Introduction Experiment and results Discussion conclusion 134Pr, 2006, D. Tonev Lifetime measurement Not typical chiral bands Cs, La, Pr, Pm, Eu. Odd-odd nuclei More than 20 expmplesin A~130 mass region Introduction Introduction 2006Y, 106Ag 11B+100Mo CIAE Joshi P et al., PRL, 2007, 98: 102501 Not good chiral bands 107Ag Intreasting case Good candidate of chirality? Previous experimental results of 107Ag Company Logo Dan Jerrestam et al., 94Zr(17O,1p3n)107Ag, Nucl.Phys.A 577 (1994) 786-812 @ 80 MeV 100Mo(11B,4n)107Ag CIAE, HI-13 Tandem accelerator 100Mo→1.57mg/cm2， Au →8.03mg/cm2 Experiment details of 107Ag Beam energy :60 MeV Company Logo Gamma Detection Array in CIAE: 10 HPGe-BGOs, 2 planar and 1 Clover detector Experimental results---Total Projection Company Logo Total projection Gate by 312keV 2×108 ?-? events E?-E? and DCO ratio matrix 865 1062 1095 1307 312 107Ag Experimental results ---Intensity and DCO ratio Total efficency Efficency at 37° Efficency at 90° New level scheme of 107Ag Discussion Company Logo PHYSICAL REVIEW C 76, 024307 (2007) 105Ag 107Ag Discussion--- woods saxon nilsson diagram Company Logo proton neutron Discussion 105Ag TAC: ε2~0.19 γ~24° A. Y. Deo et al., Phys.Rev.C 73, 034313 (2006) 105Rh TRS J. A. Alcántara-Nú?ez et al., Phys.Rev.C 69, 024317 (2004) Discussion 104Rh: PRL.92(2004),032501 Near degeneracy level energy S(I) smooth changing with spin； staggering in the B(M1)/B(E2) ratios Identical or similar Alignment Moment of inertia Discussion Discussion Near degneracy level energy S(I) smooth changing with I Staggering in B(M1)/B(E2) Band 3 and band 4 in 107Ag are suggested as chiral bands Similar aligned angular momenta Close in moment of inertia Conclusion A new level scheme of 107Ag are established Band 3 and band 4 are suggested as chiral bands Happy New Year! PHYSICAL REVIEW C 76