Letter

The European Physical Journal A - Hadrons and Nuclei

, Volume 22, Issue 1, pp 5-8

Observation of bound excited states in 15B

  • M. StanoiuAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS
  • , M. BelleguicAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS
  • , Zs. DombrádiAffiliated withInstitute of Nuclear Research Email author 
  • , D. SohlerAffiliated withInstitute of Nuclear Research
  • , F. AzaiezAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS
  • , B. A. BrownAffiliated withNSCL, Michigan State University
  • , M. J. Lopez-JimenezAffiliated withGANIL
  • , M. G. Saint-LaurentAffiliated withGANIL
  • , O. SorlinAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS
    • , Yu.-E PenionzhkevichAffiliated withFLNR, JINR
    • , N. L. AchouriAffiliated withLaboratoire de Physique Corpusculaire
    • , J. C. AngéliqueAffiliated withLaboratoire de Physique Corpusculaire
    • , C. BorceaAffiliated withIFIN-HH
    • , C. BourgeoisAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS
    • , J. M. DaugasAffiliated withGANIL
    • , F. De Oliveira-SantosAffiliated withGANIL
    • , Z. DlouhyAffiliated withNuclear Physics Institute, AS CR
    • , C. DonzaudAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS
    • , J. DupratAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS
    • , S. GrévyAffiliated withLaboratoire de Physique Corpusculaire
    • , D. Guillemaud-MuellerAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS
    • , S. LeenhardtAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS
    • , M. LewitowiczAffiliated withGANIL
    • , S. M. LukyanovAffiliated withFLNR, JINR
    • , W. MittigAffiliated withGANIL
    • , M. G. PorquetAffiliated withCSNSM, IN2P3-CNRS and Université Paris-Sud
    • , F. PougheonAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS
    • , P. Roussel-ChomazAffiliated withGANIL
    • , H. SavajolsAffiliated withGANIL
    • , Y. SobolevAffiliated withFLNR, JINR
    • , C. StodelAffiliated withGANIL
    • , J. TimárAffiliated withInstitute of Nuclear Research

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Abstract.

The structure of the A/Z = 3 nucleus 15B has been investigated using the in-beam \(\gamma\)-spectroscopy technique with a fragmentation reaction of a 36S beam on a 9Be target at 77.5 \({\rm MeV}\cdot A\). The fragments were identified and selected by their energy loss and time of flight using the SPEG spectrograph. \(\gamma\)-ray energies and intensities have been measured in coincidence with the projectile-like fragments. From this information as well as from the \(\gamma\gamma\)-coincidence relationships a level scheme is proposed for 15B up to the neutron separation energy. The experimental results have been interpreted using shell model calculations in the psd valence space. Effects of the weakly bound nature of the valence neutrons have been observed.