High-spin structure ofAg105: Search for chiral doublet bands

Abstract

The high-spin structure of the 105 Ag nucleus has been studied by using the 100 Mo( 10 B, 5n) 105 Ag reaction to search for chiral doublet bands based on the three-quasiparticle πg 9/2 ν(h 11/2 ) 2 configuration. The level scheme of 105 Ag has been extended. New bands were found and the placement of the yrast πg 9/2 ν(h 11/2 ) 2 band was corrected. No side band to the yrast πg 9/2 ν(h 11/2 ) 2 band could be found in the present experiment. This observation indicates that the γ -soft shape in the 106 Ag changed to a more γ -rigid axially symmetric shape in the yrast 105 Ag configuration. However, a new pair of bands was observed to show the expected properties of a chiral doublet structure.

High-spin structure of104Pd

“…Mapping the border of chirality in this region, the structure of 105 Ag-the even-even core of which is 104 Pd-has also been investigated. Nevertheless, no chiral sideband to the yrast band could be found [10]. Furthermore, the properties of the chiralcandidate doublet band structure in 106 Ag can be explained in terms of increased gamma softness [11] compared to that observed in 104 Rh.…”

Chirality in atomic nuclei: 2013

“…2(b), the alignments of bands 2 and 3 in 106 Ag are compared with those deduced from neighboring odd-mass nuclei, using bands C and D in 105 Ag of πg −1 9/2 ⊗ ν{g 7/2 , d 5/2 }νh 11/2 configuration. 62 As can be seen, not only the aligned angular momenta of band 2 in 106 Ag, but also those of band 3 are quite well reproduced. The alternative πg −1 9/2 ⊗ νh 3 11/2 configuration assignment for these bands, proposed by Ma et al, 58 can be excluded because its alignment is ≈ 3 larger than those of bands 2 and 3 [see e.g., Fig.…”

Lifetime measurements and magnetic rotation in107Ag

“…Furthermore, the moment for collective rotations in well-deformed nuclei and cannot be associated with magnetic rotation. The observed spins I for the bands with the configuration πg 9/2 ⊗h 11/2 2 in Rh [28,29], Ag [6,8], and In [30][31][32][33] isotopes are also plotted in Fig. 5.…”

“…Magnetic rotational or antimagnetic bands have been identified in Rh, Ag, Cd, In, Sn, and Sb isotopes in the A ≈ 110 mass region where the nuclei involve coupling of one or more proton holes in the high-g 9/2 orbitals with neutrons in the low-g 7/2 , d 5/2 , and h 11/2 orbitals. Magnetic rotational bands are also expected in 107 Ag, in addition to 103−106 Ag [3][4][5][6][7] and 109 Ag [8] in Ag isotopes. The level scheme of 107 Ag has been reported previously [9][10][11].…”