6533b7d6fe1ef96bd1265de6
RESEARCH PRODUCT
Is Seniority a Partial Dynamic Symmetry in the First $\nu g_{9/2}$ Shell?
Takaharu OtsukaToshiyuki SumikamaRyo TaniuchiGiuseppe LorussoZsolt PodolyakR. AvigoR. AvigoIstván KutiG. De AngelisShunji NishimuraA. I. MoralesA. I. MoralesA. I. MoralesNunzio ItacoP. A. SöderströmD. R. NapoliA. GottardoYusuke TsunodaN. BlasiStephen RiceZena PatelP. Van IsackerRin YokoyamaI. KojouharovG. BenzoniV. Modamio-hoybjorJinguang WuZs. DombradiF. BrowneF. L. Bello GarroteT. IsobeJan TaproggeJan TaproggeE. SahinE. SahinS. LalkovskiSatoru MomiyamaL. CoraggioN. KurzHiroyoshi SakuraiTsuyoshi MiyazakiP. DoornenbalOliver WielandM. YalcinkayaB. MelonAyumi YagiR. DaidoF. CameraF. CameraR. OrlandiR. OrlandiP. H. ReganP. H. ReganY. F. FangA. GarganoHirofumi WatanabeK. MatsuiH. SchaffnerD. MengoniD. MengoniF. C. L. CrespiF. C. L. CrespiM. C. DelattreJ. J. Valiente-dobónA. BraccoA. BraccoH. BabaZs. VajtaDóra SohlerS. CerutiS. CerutiMegumi NiikuraZhengyu XuAlison BruceL. Sinclairsubject
Nuclear and High Energy PhysicsNuclear Theory[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]Hadron[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciences29.30.Kv23.40.-sNuclear physics21.60.Cs0103 physical sciencesNeutronSeniority[ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex]010306 general physicsNuclear Experiment[ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th]Spin-½Physics010308 nuclear & particles physics23.20.LvFermionQuantum numberlcsh:QC1-999Atomic physicsNucleonlcsh:PhysicsRadioactive decaydescription
The low-lying structures of the midshell νg9/2 Ni isotopes 72Ni and 74Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei 72Co and 74Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the (81+) states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For 74Ni, the internal de-excitation pattern of the newly observed (62+) state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near 78Ni. The low-lying structures of the midshell νg9/2 Ni isotopes 72Ni and 74Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei 72Co and 74Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the (81+) states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For 74Ni, the internal de-excitation pattern of the newly observed (62+) state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near 78Ni. ispartof: Physics Letters B vol:781 pages:706-712 status: published
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-06-01 |