<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow><mml:mn>28</mml:mn></mml:mrow><mml:mrow><mml:mn>68</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>i</mml:mi></mml:mrow><mml:mrow><mml:mn>40</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Magicity versus Superfluidity
O. SorlinInstitut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, FranceS. LeenhardtInstitut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, FranceC. DonzaudInstitut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, FranceJ. DupratInstitut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, FranceF. AzaiezInstitut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, FranceF. NowackiIReS, IN2P3-CNRS, Université Louis Pasteur, BP 28, F-67037 Strasbourg Cedex, FranceH. GraweGSI, Postfach 110552, D-64200 Darmstadt, GermanyZs. DombrádiInstitute of Nuclear Research, H-4001 Debrecen, Pf. 51, HungaryF. AmoriniINFN-Laboratori Nazionali del Sud, via S. Sofia 44, I-95123 Catania, ItalyA. AstierInstitut de Physique Nucléaire Lyon, F-69622 Villeurbanne Cedex, FranceD. BaiborodinNuclear Physics Institute, AS CR, CZ 25068, Rez, Czech RepublicM. BelléguicInstitut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, FranceC. BorceaIFIN-HH, P.O. Box MG-6, ROM-76900 Bucarest-Magurele, RomaniaC. BourgeoisInstitut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, FranceD. M. CullenOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomZ. DlouhýNuclear Physics Institute, AS CR, CZ 25068, Rez, Czech RepublicE. DrăgulescuIFIN-HH, P.O. Box MG-6, ROM-76900 Bucarest-Magurele, RomaniaM. GórskaGSI, Postfach 110552, D-64200 Darmstadt, GermanyS. GrévyLPC, ISMRA, F-14050 Caen Cedex, FranceD. Guillemaud-MuellerInstitut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, FranceG.B. HagemannNBI, University of Copenhagen, Copenhagen, DenmarkB. HerskindNBI, University of Copenhagen, Copenhagen, DenmarkJ. KienerCSNSM, F-91405 Orsay Cedex, FranceR. C. LemmonCRLC, Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United KingdomM. LewitowiczGANIL, BP 5027, F-14076 Caen Cedex, FranceS. M. LukyanovFLNR, JINR, 141980 Dubna, Moscow region, RussiaP. MayetGSI, Postfach 110552, D-64200 Darmstadt, GermanyF. de Oliveira SantosGANIL, BP 5027, F-14076 Caen Cedex, FranceD. PantalicaNuclear Physics Institute, AS CR, CZ 25068, Rez, Czech RepublicYu. É. PenionzhkevichFLNR, JINR, 141980 Dubna, Moscow region, RussiaF. PougheonInstitut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, FranceA. PovesDepartamento de Fisica Teorica, Universidad Autónoma de Madrid, Cantoblanco, ES-28049 Madrid, SpainN. RedonInstitut de Physique Nucléaire Lyon, F-69622 Villeurbanne Cedex, FranceM. G. Saint‐LaurentGANIL, BP 5027, F-14076 Caen Cedex, FranceJ.A. ScarpaciInstitut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, FranceG. SlettenNBI, University of Copenhagen, Copenhagen, DenmarkM. StănoiuGANIL, BP 5027, F-14076 Caen Cedex, FranceO. TarasovFLNR, JINR, 141980 Dubna, Moscow region, RussiaCh. TheisenCEA-Saclay, DAPNIA-SPhN, F-91191 Gif sur Yvette Cedex, France
2002lv
ABI
Аннотация
The neutron-rich ${}^{66,68}\mathrm{Ni}$ have been produced at GANIL via interactions of a $65.9A\mathrm{MeV}$ ${}^{70}\mathrm{Zn}$ beam with a ${}^{58}\mathrm{Ni}$ target. Their reduced transition probability $B({E2;0}_{1}^{+}\ensuremath{\rightarrow}{2}^{+})$ has been measured for the first time by Coulomb excitation in a ${}^{208}\mathrm{Pb}$ target at intermediate energy. The $B(E2)$ value for ${}^{68}{\mathrm{Ni}}_{40}$ is unexpectedly small. An analysis in terms of large scale shell model calculations stresses the importance of proton core excitations to reproduce the $B(E2)$ values and indicates the erosion of the $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}40$ harmonic-oscillator subshell by neutron-pair scattering.
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