Evolution of the one-phonon 2{sup +}{sub 1,ms} mixed-symmetry state in N=80 isotones as a local measure for the proton-neutron interaction.

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Phys. Lett. B

DOI:https://doi.org/10.1016/j.physletb.2009.06.066· OSTI ID:969196

Ahn, T; Coquard, L; Pietralla, N; Rainovski, G; Heyde, K; Costin, A; Janssens, R V. F.; Lister, C J; Carpenter, M; Zhu, S

An inverse kinematics Coulomb excitation experiment was performed to obtain absolute E2 and M1 transition strengths in {sup 134}Xe. The measured transition strengths indicate that the 2{sub 3}{sup +} state of {sup 134}Xe is the dominant fragment of the one-phonon 2{sub 1,ms}{sup +} mixed-symmetry state. Comparing the energy of the 2{sub 1,ms}{sup +} mixed-symmetry state in {sup 134}Xe to that of the 2{sub 1,ms}{sup +} levels in the N=80 isotonic chain indicates that the separation in energy between the fully-symmetric {sub 1}{sup +} state and the {sub 1,ms}{sup +} level increases as a function of the number of proton pairs outside the Z=50 shell closure. This behavior can be understood as resulting from the mixing of the basic components of a two-fluid quantum system. A phenomenological fit based on this concept was performed. It provides the first experimental estimate of the strength of the proton-neutron quadrupole interaction derived from nuclear collective states with symmetric and antisymmetric nature.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; BGNSF; DFG
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 969196
• Report Number(s): ANL/PHY/JA-63256
• Journal Information: Phys. Lett. B, Journal Name: Phys. Lett. B Journal Issue: 1 ; 2009 Vol. 679; ISSN PYLBAJ; ISSN 0370-2693
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHAINS
COULOMB EXCITATION
ISOTONIC NUCLEI
PROTON-NEUTRON INTERACTIONS
PROTONS
QUADRUPOLES