Quest for chirality in 107Ag

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Presentation transcript:

Quest for chirality in 107Ag 第十三届全国核结构研讨会赤峰 2010.7.25-31 Quest for chirality in 107Ag He Chuangye

outline Introduction Experiment and results Discussion conclusion

Introduction Cs, La, Pr, Pm, Eu. Odd-odd nuclei 134Pr, 2006, D. Tonev Lifetime measurement Not typical chiral bands Cs, La, Pr, Pm, Eu. Odd-odd nuclei More than 20 expmples in A~130 mass region

Good candidate of chirality? Introduction 2006Y, 106Ag 11B+100Mo CIAE A~110 mass region Odd-odd Tc,Rh,Ag 6 examples pgg/2nh11/2 Hole state: pg9/2 Joshi P et al., PRL, 2007, 98: 102501 Not good chiral bands 107Ag Intreasting case Good candidate of chirality?

Previous experimental results of 107Ag Dan Jerrestam et al., 94Zr(17O,1p3n)107Ag, Nucl.Phys.A 577 (1994) 786-812 @ 80 MeV Company Logo

Experiment details of 107Ag 100Mo(11B,4n)107Ag CIAE, HI-13 Tandem accelerator 100Mo→1.57mg/cm2， Au →8.03mg/cm2 Palladium, beryllium Beam energy :60 MeV

Gamma Detection Array in CIAE: 10 HPGe-BGOs, 2 planar and 1 Clover detector www.themegallery.com Company Logo

Experimental results---Total Projection 2×108 - events E-E and DCO ratio matrix 865 Total projection 107Ag 1062 1095 1307 Gate by 312keV 312 Company Logo

Experimental results ---Intensity and DCO ratio Total efficency Efficency at 37° Efficency at 90°

New level scheme of 107Ag

105Ag 107Ag Discussion PHYSICAL REVIEW C 76, 024307 (2007) Company Logo

Discussion--- woods saxon nilsson diagram proton neutron Company Logo

Discussion 105Ag TAC: ε2~0.19 γ~24° A. Y. Deo et al., Phys.Rev.C 73, 034313 (2006) 105Rh TRS J. A. Alcántara-Núñez et al., Phys.Rev.C 69, 024317 (2004)

Discussion Identical or similar 104Rh: PRL.92(2004),032501 Alignment 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 Band 3 and band 4 in 107Ag are suggested as chiral bands Near degneracy level energy S(I) smooth changing with I Band 3 and band 4 in 107Ag are suggested as chiral bands Staggering in B(M1)/B(E2) 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

Thank You ! Happy New Year!

PHYSICAL REVIEW C 76, 024307 (2007) www.themegallery.com 105Ag PHYSICAL REVIEW C 76, 024307 (2007)

T. Koike, K. Starosta, and I. Hamamoto, www.themegallery.com +1 -1 I+4 I+3 I+2 I+1 I T. Koike, K. Starosta, and I. Hamamoto, Phys. Rev. Lett. 93, 172502 (2004) Company Logo