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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, Università and INFN sezione di Padova M.Trotta, INFN Napoli 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

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H He Li Be B C N O F Ne Na Mg 31 F 24 O H.Sakurai et al., Phys. Lett. 448B (1999) 180 M.Fauerbach et al., Phys.Rev.C53 (1996) 647 Search for the n-dripline… 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 Test of accurate shell model calculations in light nuclei 24 O 23 O

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

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

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Oxygen isotopes Experimental info for N = 15 and 16 Search for first excited state Recoil shadow technique with CLARA No evidence for excited states… M. Stanoiu et al., Phys. Rev. C69, (2004). GANIL exp A. Brown et al., 400 = 8.8 ns ? S n = 2.7 MeV S n = 3.7(4) MeV

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

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

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Proposed Prisma + Clara MeV Pb/U target MeV Pb target Beam time request: 7 days of 26 Mg With possibly 2 days of 18 O Future proposal: MeV Pb target (LOI)

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

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

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Courtesy of A.Gadea

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

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Complementary to in-beam spectroscopy with fragmentation reactions 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

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MeV + Pb or U target MeV Pb target Vamos+Exogam Proposed joint experiments: Prisma + Clara Stable and radioactive beams to study similar nuclei comparison of cross sections and reaction mechnisms I beam ~10 6

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