for the LNL-Ganil collaboration

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Presentation transcript:

for the LNL-Ganil collaboration Probing the structure of neutron-rich O and Ne isotopes using in-beam g spectroscopy with deep-inelastic collision at LNL and Ganil G. Benzoni for the LNL-Ganil collaboration Ne,F,O isotopes around N=14 and 16

Università degli Studi and INFN sezione di Milano Collaboration Università degli Studi and INFN sezione di Milano LNL, Laboratori Nazionali di Legnaro Università and INFN sezione di Padova Università di Camerino and INFN Perugia INFN sezione di Genova The Niewodniczanski Institute, Krakow Institut de Physique Nucleaire, Orsay IRES Strasbourg GANIL, Caen IPN, Lyon

Test of accurate shell model calculations in light nuclei Knowledge of the n drip line is limited to the lightest nuclei, up to O 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 Nuclear structure of nuclei going towards the n drip line Test of accurate shell model calculations in light nuclei Example: A. Brown et al., http://www.nscl.msu.edu/~brown

cross section measurements g spectroscopy Ne-O-F Report of the E421S experiment (spokeperson F.Azaiez): aim of the experiment H He Li Be B C N O F Ne Na Mg 24Ne Deep Inelastic Collision reaction with light exotic beam Population of exotic Ne-F-O isotopes cross section measurements g spectroscopy Ne-O-F

24Ne @ 114 MeV + Pb or U target Vamos+Exogam Ibeam ~106 22Ne @ 125 MeV + 208Pb target LOI @LNL coming experiment Prisma + Clara

Report of the E421S experiment: Experimental details List of EXOGAM det. used SO1 (ESS03FR) SO2 (ESS05UK) SO3 (ESS06UK) SO4 (ESS07UK) SO5 (ESS11UK) SO7 (ESS12UK) SO11 (ESS08UK) ORTEC3 (ESS13UK) ORTEC4 (ESS09UK) ORTEC5 (ESS10UK) ORTEC6 (ESS04FR) reaction: 24Ne @ 7.923 MeV/A + 208Pb (10.9 mg/cm2) 24Ne5+ , Ibeam ~ 1.5 . 105 pps beam on target for 7 days setup: Vamos + EXOGAM Vamos @ 45° EXOGAM 11 detectors (2 without Compton shield) Typical count rates: Ions: 30/min  Total Ion counts: 7*24*60*30 = 302400  cross section determination is feasible Ion-gamma coincidence 70/h Total Ion-gamma coinc. 7*24*70 = 11760 only spectroscopy of inelastic ch. Beam stable Vamos very reliable Exogam stable Good local support

Analysis in progress Report of the E421S experiment: very preliminary spectra ID-plot E DE (a.u) Ne F O Na E (a.u.) 3 days of statistics (~ 1/2) Working on mass separation Analysis in progress Conditions: Si-gamma coincidence Prompt gamma peaks calculated v/c Ne (inelastic)

Report of the E421S experiment: future F Ne 24Ne ~ 500 mb 26Ne ~ 80 mb (2n pick up) 23F ~ 20 mb (1p removal) Calculations by G.Pollarolo Beam intensity required to study weaker channels to get to more exotic Ne isotopes  ~ 106 to get to F  5.106 to get to O  ~ 107 N.B: to have gamma info. Need to go to 108