Nuclear moments of the low-lying isomeric 1+ state of 34Al: Investigation on the neutron 1p1h excitation across N = 20 in the island of inversion

Nuclear moments of the low-lying isomeric 1+ state of 34Al: Investigation on the neutron 1p1h excitation across N = 20 in the island of inversion

The nuclear g factor and quadrupole moment (Qs) have been measured for the low-lying isomeric 1+ state of 34Al, using the β-detected nuclear magnetic resonance (β-NMR) and quadrupole resonance (β-NQR) methods. Spin-polarized 34Al isotopes were produced in a one-neutron pickup reaction induced by a 3...

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Main Authors: Z.Y. Xu, H. Heylen, K. Asahi, F. Boulay, J.M. Daugas, R.P. de Groote, W. Gins, O. Kamalou, Á. Koszorús, M. Lykiardopoulou, T.J. Mertzimekis, G. Neyens, H. Nishibata, T. Otsuka, R. Orset, A. Poves, T. Sato, C. Stodel, J.C. Thomas, N. Tsunoda, Y. Utsuno, M. Vandebrouck, X.F. Yang
Format: Article
Language:English
Published: Elsevier 2018-07-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S037026931830457X
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author Z.Y. Xu
H. Heylen
K. Asahi
F. Boulay
J.M. Daugas
R.P. de Groote
W. Gins
O. Kamalou
Á. Koszorús
M. Lykiardopoulou
T.J. Mertzimekis
G. Neyens
H. Nishibata
T. Otsuka
R. Orset
A. Poves
T. Sato
C. Stodel
J.C. Thomas
N. Tsunoda
Y. Utsuno
M. Vandebrouck
X.F. Yang
spellingShingle Z.Y. Xu
H. Heylen
K. Asahi
F. Boulay
J.M. Daugas
R.P. de Groote
W. Gins
O. Kamalou
Á. Koszorús
M. Lykiardopoulou
T.J. Mertzimekis
G. Neyens
H. Nishibata
T. Otsuka
R. Orset
A. Poves
T. Sato
C. Stodel
J.C. Thomas
N. Tsunoda
Y. Utsuno
M. Vandebrouck
X.F. Yang
Nuclear moments of the low-lying isomeric 1+ state of 34Al: Investigation on the neutron 1p1h excitation across N = 20 in the island of inversion
Physics Letters B
author_facet Z.Y. Xu
H. Heylen
K. Asahi
F. Boulay
J.M. Daugas
R.P. de Groote
W. Gins
O. Kamalou
Á. Koszorús
M. Lykiardopoulou
T.J. Mertzimekis
G. Neyens
H. Nishibata
T. Otsuka
R. Orset
A. Poves
T. Sato
C. Stodel
J.C. Thomas
N. Tsunoda
Y. Utsuno
M. Vandebrouck
X.F. Yang
author_sort Z.Y. Xu
title Nuclear moments of the low-lying isomeric 1+ state of 34Al: Investigation on the neutron 1p1h excitation across N = 20 in the island of inversion
title_short Nuclear moments of the low-lying isomeric 1+ state of 34Al: Investigation on the neutron 1p1h excitation across N = 20 in the island of inversion
title_full Nuclear moments of the low-lying isomeric 1+ state of 34Al: Investigation on the neutron 1p1h excitation across N = 20 in the island of inversion
title_fullStr Nuclear moments of the low-lying isomeric 1+ state of 34Al: Investigation on the neutron 1p1h excitation across N = 20 in the island of inversion
title_full_unstemmed Nuclear moments of the low-lying isomeric 1+ state of 34Al: Investigation on the neutron 1p1h excitation across N = 20 in the island of inversion
title_sort nuclear moments of the low-lying isomeric 1+ state of 34al: investigation on the neutron 1p1h excitation across n = 20 in the island of inversion
publisher Elsevier
series Physics Letters B
issn 0370-2693
publishDate 2018-07-01
description The nuclear g factor and quadrupole moment (Qs) have been measured for the low-lying isomeric 1+ state of 34Al, using the β-detected nuclear magnetic resonance (β-NMR) and quadrupole resonance (β-NQR) methods. Spin-polarized 34Al isotopes were produced in a one-neutron pickup reaction induced by a 36S beam on a 9Be target at a kinetic energy of 77.5 MeV/nucleon, and were collected with the LISE fragment separator at GANIL. The measured g factor (|g| in a range of 1.757±0.014) and quadrupole moment (|Qs|=38(5) mb) are in good agreement with shell-model calculations using effective interactions. The similarity between the g factor of 34mAl and that of 32Al confirms a dominant neutron 2p1h configuration π(d5/2)−1⊗ν(d3/2)−1(f7/2)2 of 34mAl. In addition, the enhanced quadrupole moment of 34mAl relative to that of 32Al suggests that the neutron 1p1h excitation across the N=20 shell gap introduces extra nucleon–nucleon correlation and deformation. Keywords: β-NMR/NQR, g factor, Quadrupole moment, 34mAl
url http://www.sciencedirect.com/science/article/pii/S037026931830457X
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spelling doaj-287ec6abe8e14988bc0e58b600e972c72020-11-24T20:59:26ZengElsevierPhysics Letters B0370-26932018-07-01782619626Nuclear moments of the low-lying isomeric 1+ state of 34Al: Investigation on the neutron 1p1h excitation across N = 20 in the island of inversionZ.Y. Xu0H. Heylen1K. Asahi2F. Boulay3J.M. Daugas4R.P. de Groote5W. Gins6O. Kamalou7Á. Koszorús8M. Lykiardopoulou9T.J. Mertzimekis10G. Neyens11H. Nishibata12T. Otsuka13R. Orset14A. Poves15T. Sato16C. Stodel17J.C. Thomas18N. Tsunoda19Y. Utsuno20M. Vandebrouck21X.F. Yang22KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, 3001 Leuven, Belgium; Corresponding author.KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, 3001 Leuven, Belgium; Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland; Max-Planck-Institut fur Kernphysik, D-69117 Heidelberg, Germany; Corresponding author.RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, JapanCEA, DAM, DIF, F-91297 Arpajon Cedex, FranceCEA, DAM, DIF, F-91297 Arpajon Cedex, FranceKU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, 3001 Leuven, BelgiumKU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, 3001 Leuven, BelgiumGANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, F-14076 Caen Cedex 5, FranceKU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, 3001 Leuven, BelgiumDepartment of Physics, University of Athens, Zografou Campus, GR-15784, Athens, GreeceDepartment of Physics, University of Athens, Zografou Campus, GR-15784, Athens, GreeceKU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, 3001 Leuven, Belgium; Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland; Corresponding author.RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, JapanCenter for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan; Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, 48824, USA; KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, 3001 Leuven, BelgiumCEA, DAM, DIF, F-91297 Arpajon Cedex, FranceDepartamento de Física Teórica and IFT, UAM-CSIC, Universidad Autónoma de Madrid, E-28049 Madrid, SpainRIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, JapanGANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, F-14076 Caen Cedex 5, FranceGANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, F-14076 Caen Cedex 5, FranceCenter for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, JapanAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan; Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, JapanGANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, F-14076 Caen Cedex 5, France; Irfu, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceKU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, 3001 Leuven, BelgiumThe nuclear g factor and quadrupole moment (Qs) have been measured for the low-lying isomeric 1+ state of 34Al, using the β-detected nuclear magnetic resonance (β-NMR) and quadrupole resonance (β-NQR) methods. Spin-polarized 34Al isotopes were produced in a one-neutron pickup reaction induced by a 36S beam on a 9Be target at a kinetic energy of 77.5 MeV/nucleon, and were collected with the LISE fragment separator at GANIL. The measured g factor (|g| in a range of 1.757±0.014) and quadrupole moment (|Qs|=38(5) mb) are in good agreement with shell-model calculations using effective interactions. The similarity between the g factor of 34mAl and that of 32Al confirms a dominant neutron 2p1h configuration π(d5/2)−1⊗ν(d3/2)−1(f7/2)2 of 34mAl. In addition, the enhanced quadrupole moment of 34mAl relative to that of 32Al suggests that the neutron 1p1h excitation across the N=20 shell gap introduces extra nucleon–nucleon correlation and deformation. Keywords: β-NMR/NQR, g factor, Quadrupole moment, 34mAlhttp://www.sciencedirect.com/science/article/pii/S037026931830457X

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