Spectroscopy of F26 to Probe Proton-Neutron Forces Close to the Drip Line

Lepailleur, A.; Sorlin, O.; Caceres, L.; Bastin, B.; Borcea, C.; Borcea, R.; Brown, B. A.; Gaudefroy, L.; Grévy, S.; Grinyer, G. F.; Hagen, G.; Hjorth-Jensen, M.; Jansen, G. R.; Llidoo, O.; Negoita, F.; de Oliveira, F.; Porquet, M. -G.; Rotaru, F.; Saint-Laurent, M. -G.; Sohler, D.; Stanoiu, M.; Thomas, J. C.

doi:10.1103/physrevlett.110.082502

Spectroscopy of ${}^{26}F$ to Probe Proton-Neutron Forces Close to the Drip Line

Journal Article · Tue Feb 19 00:00:00 EST 2013 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.110.082502· OSTI ID:1565064

Lepailleur, A. ^[1]; Sorlin, O. ^[1]; Caceres, L. ^[1]; Bastin, B. ^[1]; Borcea, C. ^[2]; Borcea, R. ^[2]; Brown, B. A. ^[3]; Gaudefroy, L. ^[4]; Grévy, S. ^[5]; Grinyer, G. F. ^[1]; Hagen, G. ^[6]; Hjorth-Jensen, M. ^[7]; Jansen, G. R. ^[6]; Llidoo, O. ^[1]; Negoita, F. ^[2]; de Oliveira, F. ^[1]; Porquet, M. -G. ^[8]; Rotaru, F. ^[2]; Saint-Laurent, M. -G. ^[1]; Sohler, D. ^[9] more »

Centre National de la Recherche Scientifique (CNRS), Caen (France). Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), Grand Accelerateur National d'Ions Lourds (GANIL)
Horia Hulubei National Inst. of Physics and Nuclear Engineering, Bucharest-Magurele (Romania)
Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy, and National Superconducting Cyclotron Lab.
Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
Centre National de la Recherche Scientifique (CNRS)(France). Inst. National de Physique Nucleaire et de Physique des Particules (IN2P3), Centre d‘Études Nucléaires de Bordeaux Gradignan (UMR)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy, and National Superconducting Cyclotron Lab.; Univ. of Oslo (Norway). Dept. of Physics and Center of Mathematics for Applications
Centre National de la Recherche Scientifique (CNRS), Orsay (France). Inst. National de Physique Nucleaire et de Physique des Particules (IN2P3), Centre de Sciences Nucleaires et de Sciences de la Matiere (CSNSM)
Inst. of Nuclear Research of the Hungarian Academy of Sciences, Debrecen (Hungary)

A long-lived $$J^π = 4^+_1$$ isomer, $$T_{1/2} = 2.2(1) ms$$, has been discovered at 643.4(1) keV in the weakly bound$$^{26}_9F$$ nucleus. It was populated at Grand Accélérateur National d’Ions Lourds in the fragmentation of a $$^{36}S$$ beam. It decays by an internal transition to the $$J^π = 1^+_1$$ ground state [82(14)%], by $$β$$ decay to $$^{26}Ne$$, or $$β$$-delayed neutron emission to $$^{25}Ne$$. From the $$β$$-decay studies of the $$J^π = 1^+_1$$ and $$J^π = 4^+_1$$ states, new excited states have been discovered in $$^{25, 26}Ne$$. Gathering the measured binding energies of the $$J^π = 1^+_1 - 4^+_1$$ multiplet in $$^{26}_9F$$, we find that the proton-neutron $$π0d_{5/2}ν0d_{3/2}$$ effective force used in shell-model calculations should be reduced to properly account for the weak binding of $$^{26}_9F$$. Microscopic coupled cluster theory calculations using interactions derived from chiral effective field theory are in very good agreement with the energy of the low-lying $$1^+_1, 2^+_1, 4^+_1$$ states in $$^{26} F$$. Including three-body forces and coupling to the continuum effects improve the agreement between experiment and theory as compared to the use of two-body forces only.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; FG02-96ER40963; SC0008499

OSTI ID:: 1565064

Alternate ID(s):: OSTI ID: 1102302
OSTI ID: 22502772

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 110; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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