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N=14 and 16 shell gaps in neutron-rich oxygen isotopes

Result description

In-beam gamma-ray spectroscopy using fragmentation reactions of both stable and radioactive beams has been performed in order to study the structure of excited states in neutron-rich oxygen isotopes with masses ranging from A=20 to 24. For the produced fragments, gamma-ray energies, intensities, an gamma-gamma coincidences have been measured. Based on this information new level schemes are proposed for (21,22)O up to the neutron separation energy. The nonobservation of any gamma-decay branch from (23)Oand (24)O suggests that their excited states lie above the neutron decay thresholds. From this, as vell as from the level schemes proposed for (21)O and (22)O, the size of the N=14 and 16 shell gaps in oxygen isotopes is discussed in the light of shell-model calculations.

Keywords

shell gapsneutron-rich nucleioxygen isotopes

The result's identifiers

Alternative languages

  • Result language

    angličtina

  • Original language name

    N=14 and 16 shell gaps in neutron-rich oxygen isotopes

  • Original language description

    In-beam gamma-ray spectroscopy using fragmentation reactions of both stable and radioactive beams has been performed in order to study the structure of excited states in neutron-rich oxygen isotopes with masses ranging from A=20 to 24. For the produced fragments, gamma-ray energies, intensities, an gamma-gamma coincidences have been measured. Based on this information new level schemes are proposed for (21,22)O up to the neutron separation energy. The nonobservation of any gamma-decay branch from (23)Oand (24)O suggests that their excited states lie above the neutron decay thresholds. From this, as vell as from the level schemes proposed for (21)O and (22)O, the size of the N=14 and 16 shell gaps in oxygen isotopes is discussed in the light of shell-model calculations.

  • Czech name

    Mezery ve slupkách N=14 a 16 v neutronobohatých izotopech kyslíku

  • Czech description

    Užitím gama spektroskopie na svazku byly studovány excitované stavy neutrono- bohatých izotopů kyslíku s hmotovými čísly od A=20 do A=24. Byla navržena nová schémata hladin pro (21,22)O a diskutovány mezery mezi hladinami N=14 a 16.

Classification

  • Type

    Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    BG - Nuclear, atomic and molecular physics, accelerators

  • OECD FORD branch

Result continuities

Others

  • Publication year

    2004

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Physical Review

  • ISSN

    0556-2813

  • e-ISSN

  • Volume of the periodical

    -

  • Issue of the periodical within the volume

    69

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    1

  • Pages from-to

    034312

  • UT code for WoS article

  • EID of the result in the Scopus database

Basic information

Result type

Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

Jx

CEP

BG - Nuclear, atomic and molecular physics, accelerators

Year of implementation

2004