Observation of Three-Quasiparticle Doublet Bands in ¹²³ I: Possible Evidence of Chirality

Abstract

A new band in the odd proton nucleus 123 I is identified via in-beam 𝛾-ray spectroscopy using the 14 N+ 116 Cd reaction. This band shows up as doublets with the previously assigned 𝜋𝑔 7/2 ⊗ (𝜈ℎ 11/2 ) 2 band. Possible configurations of the new band are discussed in the framework of the cranked shell model and the geometrical model. It is argued that the new band might be a chiral partner of the previously known 𝜋𝑔 7/2 ⊗ (𝜈ℎ 11/2 ) 2 band.

New candidate chiral nucleus in the A≈80 mass region: Br473582

“…Based on constrained triaxial covariant density functional theory (CDFT) calculations [2], it has been suggested that multiple chiral doublet (Mχ D) bands can exist in a single nucleus [3][4][5][6][7][8]. To date, the chiral doublet bands, including Mχ D bands, have been reported in more than 40 nuclei in the A ≈ 80 [9,10], 100 [11][12][13][14][15][16][17][18], 130 [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35], and 190 [36][37][38][39][40][41][42] mass regions. For details, see recent reviews [43][44][45][46][47][48][49] or data tables [50].…”

Indication of γ -vibration in 123,125,127I

“…A pair of positive parity three-quasiparticle band was reported in 123,125 I and was suggested to be associated with the πh 11/2 ⊗ ν(g 7/2 /d 5/2 ) 2 configuration but different deformation [101,102]. In the case of 123 I, the observation of these bands was predicted as the possible evidence of chirality [90]. The reduced transition probabilities, B(M1)/B(E2), are very sensitive to the configurations of the states.…”