1. Quest for chirality in 107Ag
第十三届全国核结构研讨会 赤峰
Quest for chirality in 107Ag
He Chuangye

2. outline
Introduction
Experiment and results
Discussion
conclusion

3. 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

4. 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:
Not good chiral bands
107Ag
Intreasting case
Good candidate of chirality?

5. Previous experimental results of 107Ag
Dan Jerrestam et al., 94Zr(17O,1p3n)107Ag, Nucl.Phys.A 577 (1994)
@ 80 MeV
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6. 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

7. Gamma Detection Array in CIAE: 10 HPGe-BGOs, 2 planar and 1 Clover detector
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8. Experimental results---Total Projection
2×108 - events
E-E and DCO ratio matrix
865
Total projection
107Ag
1062
1095
1307
Gate by 312keV
312
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9. Experimental results ---Intensity and DCO ratio
Total efficency
Efficency at 37°
Efficency at 90°

10. New level scheme of 107Ag

12. 105Ag 107Ag Discussion PHYSICAL REVIEW C 76, 024307 (2007)
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13. Discussion--- woods saxon nilsson diagram
proton
neutron
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14. Discussion 105Ag TAC: ε2~0.19 γ~24° A. Y. Deo et al.,
Phys.Rev.C 73, (2006)
105Rh TRS
J. A. Alcántara-Núñez et al.,
Phys.Rev.C 69,
(2004)

15. 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

16. Discussion

17. 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

18. Conclusion
A new level scheme of 107Ag are established
Band 3 and band 4 are suggested as chiral bands

19. Thank You !
Happy New Year!

20. PHYSICAL REVIEW C 76, (2007)
105Ag
PHYSICAL REVIEW C 76, (2007)

21. T. Koike, K. Starosta, and I. Hamamoto, +1 -1
I+4
I+3
I+2
I+1 I
T. Koike, K. Starosta, and I. Hamamoto,
Phys. Rev. Lett. 93, (2004)
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