TY - JOUR

T1 - Excitations of the unstable nuclei 48Ni and 49Ni

AU - Kamerdzhiev, S. P.

AU - Tselyaev, V. I.

N1 - Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - The isoscalar E1 and E2 resonances in the proton-rich nuclei 48,49Ni and the {f7/2⊗ 3-} multiplet in 49Ni have been calculated taking into account the single-particle continuum exactly. The analogous calculations for the mirror nuclei 48Ca and 49Sc are presented. The models used are the continuum random-phase approximation (RPA) for 48Ni, 48Ca and the odd RPA for 49Ni, 49Sc, where the latter has been developed recently and describes both single particle and collective excitations of an odd nucleus on a common basis. In all four nuclei, we obtained a distinct splitting of the isoscalar E1 resonance into 1hω and 3hω peaks at about 11 MeV and 30 MeV, respectively. The main part of the isoscalar E1 energy-weighted sum rule (EWSR) is exhausted by the 3hω resonances. The 1hω resonances exhaust about 35% of this EWSR in 48,49Ni and about 22% in 48Ca and 49Sc. All seven {f7/2⊗ 3-} multiplet members in 49Ni are calculated to be in the 6-8 MeV energy region and have noticeable escape widths.

AB - The isoscalar E1 and E2 resonances in the proton-rich nuclei 48,49Ni and the {f7/2⊗ 3-} multiplet in 49Ni have been calculated taking into account the single-particle continuum exactly. The analogous calculations for the mirror nuclei 48Ca and 49Sc are presented. The models used are the continuum random-phase approximation (RPA) for 48Ni, 48Ca and the odd RPA for 49Ni, 49Sc, where the latter has been developed recently and describes both single particle and collective excitations of an odd nucleus on a common basis. In all four nuclei, we obtained a distinct splitting of the isoscalar E1 resonance into 1hω and 3hω peaks at about 11 MeV and 30 MeV, respectively. The main part of the isoscalar E1 energy-weighted sum rule (EWSR) is exhausted by the 3hω resonances. The 1hω resonances exhaust about 35% of this EWSR in 48,49Ni and about 22% in 48Ca and 49Sc. All seven {f7/2⊗ 3-} multiplet members in 49Ni are calculated to be in the 6-8 MeV energy region and have noticeable escape widths.

UR - http://www.scopus.com/inward/record.url?scp=18844465259&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.66.044304

DO - 10.1103/PhysRevC.66.044304

M3 - Article

AN - SCOPUS:18844465259

VL - 66

SP - 443041

EP - 443045

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 4

M1 - 044304

ER -