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Title: Coulomb energy differences in isobaric multiplets

Abstract

By comparing the excitation energies of analogue states in isobaric multiplets, several nuclear structure properties can be studied as a function of the angular momentum up to high spin states. In particular, the mirror nuclei 35Ar and 35Cl show large differences between the excitation energies of analogue negative-parity states at high spin, confirming the important contribution of the relativistic electromagnetic spin-orbit interaction to the Coulomb energy. The single-particle character of the configuration of these states is reproduced with very good accuracy by shell model calculations in the sd and pf shells valence space. In addition, evidence of isospin mixing is deduced from the El transitions linking positive and negative parity states.

Authors:
; ; ; ; ; ; ; ;  [1];  [2]; ; ; ; ; ;  [3]; ; ;  [4]; more »;  [5];  [6] « less
  1. Dipartimento di Fisica dell' Universita, Padova (Italy)
  2. (Italy)
  3. INFN, Laboratori Nazionali di Legnaro, Legnaro (Italy)
  4. National Institute for Physics and Nuclear Engineering, Bucharest (Romania)
  5. Dipartimento di Fisica dell' Universita, Florence (Italy)
  6. (Italy) (and others)
Publication Date:
OSTI Identifier:
21054803
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 884; Journal Issue: 1; Conference: 6. Latin American symposium on nuclear physics and applications, Iguazu (Argentina), 3-7 Oct 2005; Other Information: DOI: 10.1063/1.2710569; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ARGON 35; ARGON 38; CHLORINE 35; COULOMB ENERGY; E1-TRANSITIONS; EXCITATION; HIGH SPIN STATES; ISOSPIN; L-S COUPLING; MIRROR NUCLEI; MULTIPLETS; NUCLEAR STRUCTURE; PARITY; RELATIVISTIC RANGE; SHELL MODELS; SPIN

Citation Formats

Lenzi, S. M., Farnea, E., Bazzacco, D., Brandolini, F., Lunardi, S., Mason, P., Menegazzo, R., Nespolo, M., Ur, C. A., INFN, Padova, Della Vedova, F., Marginean, N., Napoli, D. R., De Angelis, G., Axiotis, M., Gadea, A., Ionescu-Bujor, M., Bucurescu, D., Iordachescu, A., Bizzeti-Sona, A. M., Bizzeti, P. G., and INFN, Florence. Coulomb energy differences in isobaric multiplets. United States: N. p., 2007. Web. doi:10.1063/1.2710569.
Lenzi, S. M., Farnea, E., Bazzacco, D., Brandolini, F., Lunardi, S., Mason, P., Menegazzo, R., Nespolo, M., Ur, C. A., INFN, Padova, Della Vedova, F., Marginean, N., Napoli, D. R., De Angelis, G., Axiotis, M., Gadea, A., Ionescu-Bujor, M., Bucurescu, D., Iordachescu, A., Bizzeti-Sona, A. M., Bizzeti, P. G., & INFN, Florence. Coulomb energy differences in isobaric multiplets. United States. doi:10.1063/1.2710569.
Lenzi, S. M., Farnea, E., Bazzacco, D., Brandolini, F., Lunardi, S., Mason, P., Menegazzo, R., Nespolo, M., Ur, C. A., INFN, Padova, Della Vedova, F., Marginean, N., Napoli, D. R., De Angelis, G., Axiotis, M., Gadea, A., Ionescu-Bujor, M., Bucurescu, D., Iordachescu, A., Bizzeti-Sona, A. M., Bizzeti, P. G., and INFN, Florence. Mon . "Coulomb energy differences in isobaric multiplets". United States. doi:10.1063/1.2710569.
@article{osti_21054803,
title = {Coulomb energy differences in isobaric multiplets},
author = {Lenzi, S. M. and Farnea, E. and Bazzacco, D. and Brandolini, F. and Lunardi, S. and Mason, P. and Menegazzo, R. and Nespolo, M. and Ur, C. A. and INFN, Padova and Della Vedova, F. and Marginean, N. and Napoli, D. R. and De Angelis, G. and Axiotis, M. and Gadea, A. and Ionescu-Bujor, M. and Bucurescu, D. and Iordachescu, A. and Bizzeti-Sona, A. M. and Bizzeti, P. G. and INFN, Florence},
abstractNote = {By comparing the excitation energies of analogue states in isobaric multiplets, several nuclear structure properties can be studied as a function of the angular momentum up to high spin states. In particular, the mirror nuclei 35Ar and 35Cl show large differences between the excitation energies of analogue negative-parity states at high spin, confirming the important contribution of the relativistic electromagnetic spin-orbit interaction to the Coulomb energy. The single-particle character of the configuration of these states is reproduced with very good accuracy by shell model calculations in the sd and pf shells valence space. In addition, evidence of isospin mixing is deduced from the El transitions linking positive and negative parity states.},
doi = {10.1063/1.2710569},
journal = {AIP Conference Proceedings},
number = 1,
volume = 884,
place = {United States},
year = {Mon Feb 12 00:00:00 EST 2007},
month = {Mon Feb 12 00:00:00 EST 2007}
}
  • Examination of fundamental symmetries is one of the key aspirations in physics research. In nuclear physics, the most fundamental of these is the exchange symmetry between neutrons and protons. The approximate charge symmetry and charge independence of the nuclear force results in striking symmetries in nuclear behavior between isobaric analogue states (IAS) - states of the same isospin quantum number in a set of nuclei of the same total number of nucleons (an isobaric multiplet). The Coulomb force breaks this symmetry and is the dominating factor in producing the large shifts in absolute binding energy between IAS. Until recently, progressmore » in understanding these energy shifts in detail was broadly restricted to the lowest energy states for a given isospin (e.g. the difference in ground state masses of a pair of mirror nuclei). However, the recent advances in spectroscopic techniques - especially the development of large gamma-ray spectrometers - has resulted in a wealth of information on IAS at high excitation energy and high angular momentum. The very small differences in excitation energy between the IAS can be interpreted, principally, in terms of Coulomb effects. The analysis of these Coulomb differences has been shown to be a remarkably sensitive probe of nuclear structure effects as well as providing stringent tests of state-of-the-art shell-model calculations. In this review, some of the latest results and their interpretation are presented.« less
  • An order of magnitude estimate is made of Coulomb energy differences for the A = 14 isobaric spin triplet and the sensitivity of the difference to correlations in the assumed nuclear wave function. The Coulomb energy difference effects on the charge dependence of nuclear (short range) forces are discussed. (R.E.U.)
  • Effects of CIB (charge independence breaking) and CSB (charge symmetry breaking) interactions on the Coulomb displacement energies of isobaric analog states are investigated for [sup 48]Ca, [sup 90]Zr, and [sup 208]Pb. The mass number dependence of the Coulomb energy anomalies is well explained when we employ CIB and CSB interactions which reproduce the differences of the scattering lengths as well as those of the effective ranges of low energy nucleon-nucleon scattering.