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Probing the structure of neutron-rich N=12-16 F,O,Ne isotopes using deep-inelastic collisions

Probing the structure of neutron-rich N=12-16 F,O,Ne isotopes using deep-inelastic collisions. G. Benzoni. G. Benzoni, A. Bracco, S. Leoni, N.Blasi, F. Camera, F. Crespi, B. Million, O. Wieland, Università degli Studi and INFN sezione di Milano

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Probing the structure of neutron-rich N=12-16 F,O,Ne isotopes using deep-inelastic collisions

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  1. Probing the structure of neutron-rich N=12-16 F,O,Ne isotopes using deep-inelastic collisions G. Benzoni G. Benzoni, A. Bracco, S. Leoni, N.Blasi, F. Camera, F. Crespi, B. Million, O. Wieland, Università degli Studi and INFN sezione di Milano G. De Angelis, A. Gadea-Raga, D. Napoli, A. Stefanini, L. Corradi, E. Fioretto, J.J. Valiente-Dobon, N. Marginean LNL, Laboratori Nazionali di Legnaro S. Lunardi, S.M. Lenzi,D. Bazzacco, E. Farnea, G. Montagnoli, C. Ur, S.Beghini, F.Scarlassara, Universitàand INFN sezione di Padova M.Trotta, INFNNapoli G. Lobianco, C. Petrache, Università di Camerino and INFN Perugia A.Zucchiatti, M.Castoldi, INFN sezione di Genova A. Maj, M. Kmiecik, K. Mazurek, J. Styczen, W. Meczynski, K. Zuber, The Niewodniczanski Institute, Krakow F.Azaiez, F. Ibrahim, D. Verrey, M. Stanoiu, Ch. Bourgeois, Institut de Physique Nucleaire,Orsay G. DuLove, D. Curien, Ch. Beck, IRES Strasbourg H. Savajols, M. Rejmund, A. Navin, G. DeFrance, GANIL, Caen N. Redon, M. Meryer, O. Stezowski IPN, Lyon

  2. Mg Na Ne F 31F O 24O N C B Be Li He H Search for the n-dripline… H.Sakurai et al., Phys. Lett. 448B (1999) 180 23O 24O • location of n drip line between F and O is not understood  N=16 for O and N=22 for F • role played by 1 and 2 p outside shell closure Z=8 M.Fauerbach et al., Phys.Rev.C53 (1996) 647 Test of accurate shell model calculations in light nuclei

  3. Mg Na Ne F 31F O 24O N C Aim of the project: Population of n-rich Ne, F and O nuclei 26Mg @ 130 MeV + 208Pb/U target Information on reaction dynamics in light nuclei • Outline : current status of • O isotopes • F isotopes • Ne isotopes

  4. 3710 ± 90 4852 ? 1710 SM exp 3199 Oxygen isotopes 20O MSU exp Experimental info for N = 12 and 14 E. Tryggestad et al., Phys. Lett. B541, 52-58(2002). GANIL exp Need to firmly establish these transitions M. Stanoiu et al., Phys. Rev. C69, 034312 (2004).

  5. Sn = 2.7 MeV  400 t = 8.8 ns ? Sn = 3.7(4) MeV Oxygen isotopes Experimental info for N = 15 and 16 M. Stanoiu et al., Phys. Rev. C69, 034312 (2004). GANIL exp No evidence for excited states… Search for first excited state  Recoil shadow technique with CLARA A. Brown et al., http://www.nscl.msu.edu/~brown

  6. Z.Elekes et al. PLB599(2004)17 F isotopes: N = 16 27F 26F 25F Need to firmly establish these transitions M.Belleguic et al. NPA682(2001)136c

  7. Ne isotopes : Isle of inversion and n gap evolution from N=20 to N=14 (16) GANIL exp Courtesy of F.Azaiez

  8. Proposed experiment @ Prisma + Clara • 26Mg @ 130 MeV + 208Pb/U target • 18O @ 110 MeV + 208Pb target Beam time request: 7 days of 26Mg With possibly 2 days of 18O Future proposal: 22Ne @ 125 MeV + 208Pb target (LOI)

  9. More details on the proposal • grazing angle: 80°  angle of Prisma • Prisma efficiency @ grazing angle: 3-5 % • 60-70% efficiency at focal plane • cfr. 24Mg+24Mg experiment (F.Hass) • 24 to 25 Clovers setup Clara • efficiency ~ 3 % • Peak/Total ~ 50% • Position  = 104°– 156° • FWHM ~ 10 keV @ 1.3 MeV and v/c = 10%  30000 p-g coincidences in weakest channels in 7 days ( ~1000 p-g-g coincidences)

  10. E*1 E*2 Measurement of the gamma decay from pygmy resonance using netron transfer reaction at 15 MeV/u (d,p) in inverse kinematics Gamma-ray particle coincidence , difference technique obtain also the level density, important information for calculations of reaction rates in the r-process BeforeAfter For more neutron rich nuclei this yield is expected to be much larger A. Voinov et al, PRC (2002)

  11. Courtesy of A.Gadea

  12. Coaxial HPGe + BGO in add back HPGe for High Energy gamma rays Euroball Cluster in Add Back (no BGO) B.Million et al NIM A452(2000)422

  13. high lying states in Ne, F, and O isotopes • n-odd isotopes in particular…known less accurately • Information on reaction mechanism with light n-rich nuclei • complete distributions of production yields in order to study the N/Z equilibration process in deep inelastic reactions induced by neutron-rich beams Complementary to in-beam g spectroscopy with fragmentation reactions

  14. Proposed joint experiments: 22Ne @ 125 MeV + 208Pb target Prisma + Clara 24Ne @ 114 MeV + Pb or U target Vamos+Exogam Ibeam~106 Stableandradioactivebeams to study similar nuclei comparison of cross sections and reaction mechnisms

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