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… Show more
“…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.…”
The high-spin structure of the nucleus 104 Pd was studied through the 96 Zr( 13 C,5n) reaction at incident energies of 51 and 58 MeV, using the Euroball IV γ -ray spectrometer in conjunction with the DIAMANT charged-particle array. Several new medium-and high-spin bands were revealed. The already known positive-parity yrast and the negative-parity cascades were extended up to E x ∼ 13, ∼ 11, and ∼ 9 MeV with I π = (26 + ), I π = (23 − ), and (20 − ), respectively. The deduced band structures were compared with Woods-Saxon total Routhian surface (TRS) calculations. In addition, non-yrast low-lying positive-parity bands were identified, which were assigned to soft γ -vibrational excitations.
“…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.…”
The high-spin structure of the nucleus 104 Pd was studied through the 96 Zr( 13 C,5n) reaction at incident energies of 51 and 58 MeV, using the Euroball IV γ -ray spectrometer in conjunction with the DIAMANT charged-particle array. Several new medium-and high-spin bands were revealed. The already known positive-parity yrast and the negative-parity cascades were extended up to E x ∼ 13, ∼ 11, and ∼ 9 MeV with I π = (26 + ), I π = (23 − ), and (20 − ), respectively. The deduced band structures were compared with Woods-Saxon total Routhian surface (TRS) calculations. In addition, non-yrast low-lying positive-parity bands were identified, which were assigned to soft γ -vibrational excitations.
“…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.…”
Progresses of the chirality in atomic nuclei are reviewed, in particular, the recently proposed collective Hamiltonian based on tilted axis cranking approach to describe chiral vibration and rotation modes, and the experimental achievements for chirality and multiple chiral doublets, i.e., in 106 Ag, 133 Ce and 103 Rh. The first experimental evidences of multiple chiral doublet bands with distinct and identical configuration found in 133 Ce and 103 Rh are discussed in detail.
“…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.…”
Section: Discussionmentioning
confidence: 99%
“…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].…”
The excited states in 107 Ag were populated through the heavy-ion fusion evaporation reaction 100 Mo ( 11 B, 4n) 107 Ag at a beam energy of 46 MeV. Lifetimes of high-spin states in 107 Ag have been measured through the Doppler shift attenuation method. The deduced B(M1) values, gradually decreasing with increasing spin, clearly demonstrate that both the yrast positive-parity band and the yrast negative-parity band in 107 Ag are magnetic rotation bands. Furthermore, experimental deduced B(M1) values for the yrast positive-parity band are compared with the predictions of the particle rotor model. The approximate agreement between theoretical calculations and experimental results further confirms the mechanism of magnetic rotation for the yrast positive-parity band. In addition, a systematic investigation shows the evolution of the magnetic rotation mechanism in the A ≈ 110 mass region.
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