Spectroscopy of Na 28: Shell evolution toward the drip line

A. Lepailleur, K. Wimmer, A. Mutschler, O. Sorlin, J. C. Thomas, V. Bader, C. Bancroft, D. Barofsky, B. Bastin, T. Baugher, D. Bazin, V. Bildstein, C. Borcea, R. Borcea, B. A. Brown, L. Caceres, A. Gade, L. Gaudefroy, S. Grévy, G. F. GrinyerH. Iwasaki, E. Khan, T. Kröll, C. Langer, A. Lemasson, O. Llidoo, J. Lloyd, E. Lunderberg, F. Negoita, F. De Oliveira Santos, G. Perdikakis, F. Recchia, T. Redpath, T. Roger, F. Rotaru, S. Saenz, M. G. Saint-Laurent, D. Smalley, D. Sohler, M. Stanoiu, S. R. Stroberg, M. Vandebrouck, D. Weisshaar, A. Westerberg

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Excited states have been studied in Na28 using the β-decay of implanted Ne28 ions at the Grand Accélérateur National d'Ions Lourds/LISE as well as the in-beam γ-ray spectroscopy at the National Superconducting Cyclotron Laboratory/S800 facility. New states of positive (Jπ=3+,4+) and negative (Jπ=1 - 5-) parity are proposed. The former arise from the coupling between 0d5/2 protons and 0d3/2 neutrons, while the latter are attributable to couplings of 0d5/2 protons with 1p3/2 or 0f7/2 neutrons. While the relative energies between the Jπ=1+-4+ states are well reproduced with the USDA interaction in the N=17 isotones, a progressive shift in the ground-state binding energy (by about 500 keV) is observed between F26 and Al30. This points to a possible change in the proton-neutron 0d5/2-0d3/2 effective interaction when moving from stability to the drip line. The presence of Jπ=1 - 4- negative-parity states around 1.5 MeV as well as of a candidate for a Jπ=5- state around 2.5 MeV give further support to the collapse of the N=20 gap and to the inversion between the neutron 0f7/2 and 1p3/2 levels below Z=12. These features are discussed in the framework of shell-model and energy-density-functional calculations, leading to predicted negative-parity states in the low-energy spectra of the F26 and O25 nuclei.

Original languageEnglish
Article number054309
JournalPhysical Review C - Nuclear Physics
Volume92
Issue number5
DOIs
Publication statusPublished - Nov 16 2015

Fingerprint

neutrons
parity
spectroscopy
protons
cyclotrons
rays
ions
energy spectra
flux density
binding energy
interactions
inversions
nuclei
ground state
shift
decay
excitation
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Lepailleur, A., Wimmer, K., Mutschler, A., Sorlin, O., Thomas, J. C., Bader, V., ... Westerberg, A. (2015). Spectroscopy of Na 28: Shell evolution toward the drip line. Physical Review C - Nuclear Physics, 92(5), [054309]. https://doi.org/10.1103/PhysRevC.92.054309

Spectroscopy of Na 28 : Shell evolution toward the drip line. / Lepailleur, A.; Wimmer, K.; Mutschler, A.; Sorlin, O.; Thomas, J. C.; Bader, V.; Bancroft, C.; Barofsky, D.; Bastin, B.; Baugher, T.; Bazin, D.; Bildstein, V.; Borcea, C.; Borcea, R.; Brown, B. A.; Caceres, L.; Gade, A.; Gaudefroy, L.; Grévy, S.; Grinyer, G. F.; Iwasaki, H.; Khan, E.; Kröll, T.; Langer, C.; Lemasson, A.; Llidoo, O.; Lloyd, J.; Lunderberg, E.; Negoita, F.; De Oliveira Santos, F.; Perdikakis, G.; Recchia, F.; Redpath, T.; Roger, T.; Rotaru, F.; Saenz, S.; Saint-Laurent, M. G.; Smalley, D.; Sohler, D.; Stanoiu, M.; Stroberg, S. R.; Vandebrouck, M.; Weisshaar, D.; Westerberg, A.

In: Physical Review C - Nuclear Physics, Vol. 92, No. 5, 054309, 16.11.2015.

Research output: Contribution to journalArticle

Lepailleur, A, Wimmer, K, Mutschler, A, Sorlin, O, Thomas, JC, Bader, V, Bancroft, C, Barofsky, D, Bastin, B, Baugher, T, Bazin, D, Bildstein, V, Borcea, C, Borcea, R, Brown, BA, Caceres, L, Gade, A, Gaudefroy, L, Grévy, S, Grinyer, GF, Iwasaki, H, Khan, E, Kröll, T, Langer, C, Lemasson, A, Llidoo, O, Lloyd, J, Lunderberg, E, Negoita, F, De Oliveira Santos, F, Perdikakis, G, Recchia, F, Redpath, T, Roger, T, Rotaru, F, Saenz, S, Saint-Laurent, MG, Smalley, D, Sohler, D, Stanoiu, M, Stroberg, SR, Vandebrouck, M, Weisshaar, D & Westerberg, A 2015, 'Spectroscopy of Na 28: Shell evolution toward the drip line', Physical Review C - Nuclear Physics, vol. 92, no. 5, 054309. https://doi.org/10.1103/PhysRevC.92.054309
Lepailleur A, Wimmer K, Mutschler A, Sorlin O, Thomas JC, Bader V et al. Spectroscopy of Na 28: Shell evolution toward the drip line. Physical Review C - Nuclear Physics. 2015 Nov 16;92(5). 054309. https://doi.org/10.1103/PhysRevC.92.054309
Lepailleur, A. ; Wimmer, K. ; Mutschler, A. ; Sorlin, O. ; Thomas, J. C. ; Bader, V. ; Bancroft, C. ; Barofsky, D. ; Bastin, B. ; Baugher, T. ; Bazin, D. ; Bildstein, V. ; Borcea, C. ; Borcea, R. ; Brown, B. A. ; Caceres, L. ; Gade, A. ; Gaudefroy, L. ; Grévy, S. ; Grinyer, G. F. ; Iwasaki, H. ; Khan, E. ; Kröll, T. ; Langer, C. ; Lemasson, A. ; Llidoo, O. ; Lloyd, J. ; Lunderberg, E. ; Negoita, F. ; De Oliveira Santos, F. ; Perdikakis, G. ; Recchia, F. ; Redpath, T. ; Roger, T. ; Rotaru, F. ; Saenz, S. ; Saint-Laurent, M. G. ; Smalley, D. ; Sohler, D. ; Stanoiu, M. ; Stroberg, S. R. ; Vandebrouck, M. ; Weisshaar, D. ; Westerberg, A. / Spectroscopy of Na 28 : Shell evolution toward the drip line. In: Physical Review C - Nuclear Physics. 2015 ; Vol. 92, No. 5.
@article{797814d68b774b24b26720a52d6387ff,
title = "Spectroscopy of Na 28: Shell evolution toward the drip line",
abstract = "Excited states have been studied in Na28 using the β-decay of implanted Ne28 ions at the Grand Acc{\'e}l{\'e}rateur National d'Ions Lourds/LISE as well as the in-beam γ-ray spectroscopy at the National Superconducting Cyclotron Laboratory/S800 facility. New states of positive (Jπ=3+,4+) and negative (Jπ=1 - 5-) parity are proposed. The former arise from the coupling between 0d5/2 protons and 0d3/2 neutrons, while the latter are attributable to couplings of 0d5/2 protons with 1p3/2 or 0f7/2 neutrons. While the relative energies between the Jπ=1+-4+ states are well reproduced with the USDA interaction in the N=17 isotones, a progressive shift in the ground-state binding energy (by about 500 keV) is observed between F26 and Al30. This points to a possible change in the proton-neutron 0d5/2-0d3/2 effective interaction when moving from stability to the drip line. The presence of Jπ=1 - 4- negative-parity states around 1.5 MeV as well as of a candidate for a Jπ=5- state around 2.5 MeV give further support to the collapse of the N=20 gap and to the inversion between the neutron 0f7/2 and 1p3/2 levels below Z=12. These features are discussed in the framework of shell-model and energy-density-functional calculations, leading to predicted negative-parity states in the low-energy spectra of the F26 and O25 nuclei.",
author = "A. Lepailleur and K. Wimmer and A. Mutschler and O. Sorlin and Thomas, {J. C.} and V. Bader and C. Bancroft and D. Barofsky and B. Bastin and T. Baugher and D. Bazin and V. Bildstein and C. Borcea and R. Borcea and Brown, {B. A.} and L. Caceres and A. Gade and L. Gaudefroy and S. Gr{\'e}vy and Grinyer, {G. F.} and H. Iwasaki and E. Khan and T. Kr{\"o}ll and C. Langer and A. Lemasson and O. Llidoo and J. Lloyd and E. Lunderberg and F. Negoita and {De Oliveira Santos}, F. and G. Perdikakis and F. Recchia and T. Redpath and T. Roger and F. Rotaru and S. Saenz and Saint-Laurent, {M. G.} and D. Smalley and D. Sohler and M. Stanoiu and Stroberg, {S. R.} and M. Vandebrouck and D. Weisshaar and A. Westerberg",
year = "2015",
month = "11",
day = "16",
doi = "10.1103/PhysRevC.92.054309",
language = "English",
volume = "92",
journal = "Physical Review C - Nuclear Physics",
issn = "0556-2813",
publisher = "American Physical Society",
number = "5",

}

TY - JOUR

T1 - Spectroscopy of Na 28

T2 - Shell evolution toward the drip line

AU - Lepailleur, A.

AU - Wimmer, K.

AU - Mutschler, A.

AU - Sorlin, O.

AU - Thomas, J. C.

AU - Bader, V.

AU - Bancroft, C.

AU - Barofsky, D.

AU - Bastin, B.

AU - Baugher, T.

AU - Bazin, D.

AU - Bildstein, V.

AU - Borcea, C.

AU - Borcea, R.

AU - Brown, B. A.

AU - Caceres, L.

AU - Gade, A.

AU - Gaudefroy, L.

AU - Grévy, S.

AU - Grinyer, G. F.

AU - Iwasaki, H.

AU - Khan, E.

AU - Kröll, T.

AU - Langer, C.

AU - Lemasson, A.

AU - Llidoo, O.

AU - Lloyd, J.

AU - Lunderberg, E.

AU - Negoita, F.

AU - De Oliveira Santos, F.

AU - Perdikakis, G.

AU - Recchia, F.

AU - Redpath, T.

AU - Roger, T.

AU - Rotaru, F.

AU - Saenz, S.

AU - Saint-Laurent, M. G.

AU - Smalley, D.

AU - Sohler, D.

AU - Stanoiu, M.

AU - Stroberg, S. R.

AU - Vandebrouck, M.

AU - Weisshaar, D.

AU - Westerberg, A.

PY - 2015/11/16

Y1 - 2015/11/16

N2 - Excited states have been studied in Na28 using the β-decay of implanted Ne28 ions at the Grand Accélérateur National d'Ions Lourds/LISE as well as the in-beam γ-ray spectroscopy at the National Superconducting Cyclotron Laboratory/S800 facility. New states of positive (Jπ=3+,4+) and negative (Jπ=1 - 5-) parity are proposed. The former arise from the coupling between 0d5/2 protons and 0d3/2 neutrons, while the latter are attributable to couplings of 0d5/2 protons with 1p3/2 or 0f7/2 neutrons. While the relative energies between the Jπ=1+-4+ states are well reproduced with the USDA interaction in the N=17 isotones, a progressive shift in the ground-state binding energy (by about 500 keV) is observed between F26 and Al30. This points to a possible change in the proton-neutron 0d5/2-0d3/2 effective interaction when moving from stability to the drip line. The presence of Jπ=1 - 4- negative-parity states around 1.5 MeV as well as of a candidate for a Jπ=5- state around 2.5 MeV give further support to the collapse of the N=20 gap and to the inversion between the neutron 0f7/2 and 1p3/2 levels below Z=12. These features are discussed in the framework of shell-model and energy-density-functional calculations, leading to predicted negative-parity states in the low-energy spectra of the F26 and O25 nuclei.

AB - Excited states have been studied in Na28 using the β-decay of implanted Ne28 ions at the Grand Accélérateur National d'Ions Lourds/LISE as well as the in-beam γ-ray spectroscopy at the National Superconducting Cyclotron Laboratory/S800 facility. New states of positive (Jπ=3+,4+) and negative (Jπ=1 - 5-) parity are proposed. The former arise from the coupling between 0d5/2 protons and 0d3/2 neutrons, while the latter are attributable to couplings of 0d5/2 protons with 1p3/2 or 0f7/2 neutrons. While the relative energies between the Jπ=1+-4+ states are well reproduced with the USDA interaction in the N=17 isotones, a progressive shift in the ground-state binding energy (by about 500 keV) is observed between F26 and Al30. This points to a possible change in the proton-neutron 0d5/2-0d3/2 effective interaction when moving from stability to the drip line. The presence of Jπ=1 - 4- negative-parity states around 1.5 MeV as well as of a candidate for a Jπ=5- state around 2.5 MeV give further support to the collapse of the N=20 gap and to the inversion between the neutron 0f7/2 and 1p3/2 levels below Z=12. These features are discussed in the framework of shell-model and energy-density-functional calculations, leading to predicted negative-parity states in the low-energy spectra of the F26 and O25 nuclei.

UR - http://www.scopus.com/inward/record.url?scp=84948450689&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84948450689&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.92.054309

DO - 10.1103/PhysRevC.92.054309

M3 - Article

AN - SCOPUS:84948450689

VL - 92

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 5

M1 - 054309

ER -