A1 Journal article (refereed)
Transition probabilities in 31P and 31S : A test for isospin symmetry (2021)
Tonev, D., de Angelis, G., Deloncle, I., Goutev, N., De Gregorio, G., Pavlov, P., Pantaleev, I.L., Iliev, S., Yavahchova, M.S., Bizzeti, P.G., Demerdjiev, A., Dimitrov, D.T., Farnea, E., Gadea, A., Geleva, E., He, C.Y., Laftchiev, H., Lenzi, S.M., Lunardi, S., . . . Wirth, H.-F. (2021). Transition probabilities in 31P and 31S : A test for isospin symmetry. Physics Letters B, 821, Article 136603. https://doi.org/10.1016/j.physletb.2021.136603
JYU authors or editors
Publication details
All authors or editors: Tonev, D.; de Angelis, G.; Deloncle, I.; Goutev, N.; De Gregorio, G.; Pavlov, P.; Pantaleev, I.L.; Iliev, S.; Yavahchova, M.S.; Bizzeti, P.G.; et al.
Journal or series: Physics Letters B
ISSN: 0370-2693
eISSN: 1873-2445
Publication year: 2021
Volume: 821
Article number: 136603
Publisher: Elsevier
Publication country: Netherlands
Publication language: English
DOI: https://doi.org/10.1016/j.physletb.2021.136603
Publication open access: Openly available
Publication channel open access: Open Access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/77833
Abstract
Excited states in the mirror nuclei 31P and 31S were populated in the 1p and 1n exit channels of the reaction 20Ne + 12C, at a beam energy of 33 MeV. The 20Ne beam was delivered for the first time by the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. Angular correlations of coincident γ-rays and Doppler-shift attenuation lifetime measurements were performed using the multi-detector array GASP in conjunction with the EUCLIDES charged particle detector. In the observed B(E1) strengths, the isoscalar component, amounting to 24% of the isovector one, provides strong evidence for breaking of the isospin symmetry in the mass region. Self-consistent beyond mean field calculations using Equation of Motion method based on a chiral potential and including two- and three-body forces reproduce well the experimental B(E1) strengths, reinforcing our conclusion. Coherent mixing from higher-lying states involving the Giant Isovector Monopole Resonance accounts well for the effect observed. The breaking of the isospin symmetry originates from the violation of the charge symmetry of the two- and three-body parts of the potential, only related to the Coulomb interaction.
Keywords: nuclear physics
Free keywords: mirror nuclei; lifetime measurements; transition probabilities; isospin symmetry; microscopic multiphonon model
Contributing organizations
Ministry reporting: Yes
Reporting Year: 2021
JUFO rating: 2