"Identifying neutron rich nuclei using projectile fragmentation at GSI"
Michael Bunce, University of Surrey
(id #124)
Seminar: NoPoster: Yes
Invited talk: No
Identifying neutron rich nuclei using projectile fragmentation at GSI
M Bunce1, M Bowry1, S Pietri2, J Kurcewicz2, Zs Podolyák1, P H Regan1, F Farinon2, H Geissel2,
C Nociforo2, A Prochazka2, J Gerl2, I Kojouharov2, H Schaffner2, N Kurz2, E T Gregor2,
A M Denis Bacelar3, A M Bruce3, G F Farrelly1, N Alkhomashi1, N Al-Dahan1 et al.
1 University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
2 GSI, Planckstrasse 1, D - 64291 Darmstadt, Germany
3 University of Brighton, Brighton BN2 4GJ, United Kingdom
The work presented in this abstract was carried out at Helmholtz Centre for Heavy Ion Research (GSI, Germany). The beam used to create the isotopes of interest was produced using the SIS-18 synchrotron which delivers the beam particles to the target at an energy of ~1 GeV/u. A high intensity (~2x109 particles per spill) primary beam of 238U was incident on a 1.6 g/cm2 9Be target producing a radioactive beam of neutron rich nuclei for investigation. The radionuclide of interest is selected via passing the radioactive beam through the fragment separator (FRS). The FRS consists of four large dipole magnets and a number of quadrupole magnets which are used for particle selection and focussing of the beam onto the detectors for investigation. After passing through the FRS the the ions are implanted into a passive stopper. The stopper is surrounded by 15 High Purity Germanium (HPGe) detectors (RISING array) which are used to observe the gamma-rays emitted from the de-exciting isomeric states in the implanted nuclei. The aim of this experiment was to observe a large variety of neutron rich isotopes in the region of A=200. The experimental setting presented is a calibration setting optimised for 205Pb, with nuclei ranging from Rn to Au observed.
One of the central goals of nuclear physics is to understand how nuclear structure evolves and to create accurate theoretical models of the structure of nuclei. For this to occur the models must be tested by surveying the chart of nuclide's to establish their validity. A region of particular interest is nuclide's that lay on or close to closed shells (e.g. N=126). By investigating the neutron rich nuclide's far from beta stability but near a closed shell theoretical models can be tested for these previously unknown nuclei.
The experimental procedures used to create the nuclei of interest and techniques used to identify them are presented with preliminary results shown.
M Bunce1, M Bowry1, S Pietri2, J Kurcewicz2, Zs Podolyák1, P H Regan1, F Farinon2, H Geissel2,
C Nociforo2, A Prochazka2, J Gerl2, I Kojouharov2, H Schaffner2, N Kurz2, E T Gregor2,
A M Denis Bacelar3, A M Bruce3, G F Farrelly1, N Alkhomashi1, N Al-Dahan1 et al.
1 University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
2 GSI, Planckstrasse 1, D - 64291 Darmstadt, Germany
3 University of Brighton, Brighton BN2 4GJ, United Kingdom
The work presented in this abstract was carried out at Helmholtz Centre for Heavy Ion Research (GSI, Germany). The beam used to create the isotopes of interest was produced using the SIS-18 synchrotron which delivers the beam particles to the target at an energy of ~1 GeV/u. A high intensity (~2x109 particles per spill) primary beam of 238U was incident on a 1.6 g/cm2 9Be target producing a radioactive beam of neutron rich nuclei for investigation. The radionuclide of interest is selected via passing the radioactive beam through the fragment separator (FRS). The FRS consists of four large dipole magnets and a number of quadrupole magnets which are used for particle selection and focussing of the beam onto the detectors for investigation. After passing through the FRS the the ions are implanted into a passive stopper. The stopper is surrounded by 15 High Purity Germanium (HPGe) detectors (RISING array) which are used to observe the gamma-rays emitted from the de-exciting isomeric states in the implanted nuclei. The aim of this experiment was to observe a large variety of neutron rich isotopes in the region of A=200. The experimental setting presented is a calibration setting optimised for 205Pb, with nuclei ranging from Rn to Au observed.
One of the central goals of nuclear physics is to understand how nuclear structure evolves and to create accurate theoretical models of the structure of nuclei. For this to occur the models must be tested by surveying the chart of nuclide's to establish their validity. A region of particular interest is nuclide's that lay on or close to closed shells (e.g. N=126). By investigating the neutron rich nuclide's far from beta stability but near a closed shell theoretical models can be tested for these previously unknown nuclei.
The experimental procedures used to create the nuclei of interest and techniques used to identify them are presented with preliminary results shown.
