Spectroscopy in the Z = 49 ^108,110In isotopes: Lifetime measurements in shears bands

TY - JOUR

T1 - Spectroscopy in the Z = 49 108,110In isotopes

T2 - Lifetime measurements in shears bands

AU - Chiara, C. J.

AU - Fossan, D. B.

AU - Janzen, V. P.

AU - Koike, T.

AU - LaFosse, D. R.

AU - Lane, G. J.

AU - Mullins, S. M.

AU - Paul, E. S.

AU - Radford, D. C.

AU - Schnare, H.

AU - Sears, J. M.

AU - Smith, J. F.

AU - Starosta, K.

AU - Vaska, P.

AU - Wadsworth, R.

AU - Ward, D.

AU - Frauendorf, S.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Excited states have been populated in 108In and 110In in complementary backed- and thin-target experiments using the Stony Brook and the 8π Ge-detector arrays. The level schemes for both isotopes have been extended and modified, including the first observation of ΔI = 2 bands in 110In. Lifetimes of states in four ΔI = 1 bands and one ΔI = 2 band have been measured using the Doppler-shift attenuation method. Experimental total angular momenta and reduced transition strengths for the ΔI = 1 bands have been compared with tilted axis cranking predictions for shears bands with configurations involving one proton g9/2 hole and one or three valence quasineutrons from the h11/2 and g7/2/d5/2 orbitals. The ΔI = 2 bands have been compared with principal axis cranking predictions for configurations with two g9/2 proton holes and a g7/2 or d5/2 proton and one-or three-quasineutron configurations involving the h11/2 and g7/2/d5/2 orbitals. In general, there is good overall agreement for both the angular momenta and reduced transition strengths. The ΔI = 1 and ΔI = 2 bands have large J(2)B(E2) ratios as expected for the shears mechanism. The B(M1) strengths deduced for the ΔI = 1 bands show a decreasing trend as a function of spin, which is also a feature of the shears mechanism. Configuration assignments have been made for most observed bands based on comparisons with theory and systematics of neighboring nuclei.

AB - Excited states have been populated in 108In and 110In in complementary backed- and thin-target experiments using the Stony Brook and the 8π Ge-detector arrays. The level schemes for both isotopes have been extended and modified, including the first observation of ΔI = 2 bands in 110In. Lifetimes of states in four ΔI = 1 bands and one ΔI = 2 band have been measured using the Doppler-shift attenuation method. Experimental total angular momenta and reduced transition strengths for the ΔI = 1 bands have been compared with tilted axis cranking predictions for shears bands with configurations involving one proton g9/2 hole and one or three valence quasineutrons from the h11/2 and g7/2/d5/2 orbitals. The ΔI = 2 bands have been compared with principal axis cranking predictions for configurations with two g9/2 proton holes and a g7/2 or d5/2 proton and one-or three-quasineutron configurations involving the h11/2 and g7/2/d5/2 orbitals. In general, there is good overall agreement for both the angular momenta and reduced transition strengths. The ΔI = 1 and ΔI = 2 bands have large J(2)B(E2) ratios as expected for the shears mechanism. The B(M1) strengths deduced for the ΔI = 1 bands show a decreasing trend as a function of spin, which is also a feature of the shears mechanism. Configuration assignments have been made for most observed bands based on comparisons with theory and systematics of neighboring nuclei.

UR - http://www.scopus.com/inward/record.url?scp=17044461679&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.64.054314

DO - 10.1103/PhysRevC.64.054314

M3 - Article

AN - SCOPUS:17044461679

SN - 0556-2813

VL - 64

SP - 543141

EP - 5431430

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 5

M1 - 054314

ER -