TY - JOUR
T1 - Nuclear moments of the low-lying isomeric 1+ state of 34Al
T2 - Investigation on the neutron 1p1h excitation across N = 20 in the island of inversion
AU - Xu, Z. Y.
AU - Heylen, H.
AU - Asahi, K.
AU - Boulay, F.
AU - Daugas, J. M.
AU - de Groote, R. P.
AU - Gins, W.
AU - Kamalou, O.
AU - Koszorús,
AU - Lykiardopoulou, M.
AU - Mertzimekis, T. J.
AU - Neyens, G.
AU - Nishibata, H.
AU - Otsuka, T.
AU - Orset, R.
AU - Poves, A.
AU - Sato, T.
AU - Stodel, C.
AU - Thomas, J. C.
AU - Tsunoda, N.
AU - Utsuno, Y.
AU - Vandebrouck, M.
AU - Yang, X. F.
N1 - Funding Information:
The authors thank the GANIL staff for their support during the preparation and running of the experiment. This work was partly supported by the European Union's Horizon 2020 research and innovation programme under grant agreement No. 654002 , by the FWO-Vlaanderen , by the IAP programme of the Belgium Science Policy under Grants No. P6/23 and No. P7/12 , by the Nupnet network SARFEN ( PRI-PIMMNUP-2011-1361 ), by MINECO (Spain) grant FPA2014-57196 , by programa Severo Ochoa SEV-2016-0597 , by Grants-in-Aid for Scientific Research ( 23244049 , 15K05090 ), by the HPCI Strategic Program ( hp140210 , hp150224 ), by MEXT and JICFuS as a priority issue (Elucidation of the fundamental laws and evolution of the universe) to be tackled by using Post “K” Computer ( hp160211 ), by the CNS-RIKEN joint project for large-scale nuclear structure calculations. The experiment was carried out under Experimental Program E650.
Publisher Copyright:
© 2018 The Author(s)
PY - 2018/7/10
Y1 - 2018/7/10
N2 - 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.
AB - 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.
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U2 - 10.1016/j.physletb.2018.06.009
DO - 10.1016/j.physletb.2018.06.009
M3 - Article
AN - SCOPUS:85048392832
SN - 0370-2693
VL - 782
SP - 619
EP - 626
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -