Coulomb-nuclear interference with {sup 6}Li: Isospin character of the 2{sub 1}{sup +} excitation in {sup 70,72,74}Ge

Journal Article · Tue Feb 01 00:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.024303· OSTI ID:20695930

Barbosa, M D.L.; Borello-Lewin, T; Horodynski-Matsushigue, L B; Duarte, J L.M.; Rodrigues, C L; Rodrigues, M R.D. ^[1]; Ukita, G M ^[1]

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1. Instituto de Fisica, Universidade de Sao Paulo, C.P. 66318, 05315-970, Sao Paulo, SP (Brazil)

Ratios of B(E2) to B(IS2), that is, of the reduced quadrupole transition probabilities related, respectively, to charge and mass were extracted through Coulomb-nuclear interference (CNI) for the excitation of the 2{sub 1}{sup +} states in {sup 70,72,74}Ge, with a relative accuracy of less than 4%. For this purpose, the CNI angular distributions associated with the inelastic scattering of 28-MeV incident {sup 6}Li ions accelerated by the Sao Paulo Pelletron, and momentum analyzed by the Enge magnetic spectrograph were interpreted within the DWBA-DOMP approach (distorted wave approximation for the scattering process and deformed optical model for the structure representation) with global {sup 6}Li optical parameters. The present CNI results demonstrate an abrupt change in the B(E2)/B(IS2) ratio for {sup 74}Ge: although for {sup 70,72}Ge, values of the order of 1.0 or slightly higher were obtained, this ratio is 0.66 (7) for {sup 74}Ge. The heavier Ge isotope is thus one of the few nuclei that, so far, have been shown to present clear mixed symmetry components in their ground-state band.

• OSTI ID: 20695930
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 71, Issue 2; Other Information: DOI: 10.1103/PhysRevC.71.024303; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
COULOMB FIELD
DISTORTED WAVE THEORY
DWBA
E2-TRANSITIONS
EXCITATION
EXCITED STATES
GERMANIUM 70
GERMANIUM 72
GERMANIUM 74
GROUND STATES
INELASTIC SCATTERING
INTERFERENCE
ISOSPIN
LITHIUM 6
LITHIUM 6 REACTIONS
MEV RANGE
OPTICAL MODELS
PELLETRON ACCELERATORS
PROBABILITY