1. 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

2. 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

3. 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.,

4. 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

5. 24Ne @ 114 MeV + Pb or U target Vamos+Exogam Ibeam ~106
125 MeV + 208Pb target
coming experiment
Prisma + Clara

6. 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: MeV/A + 208Pb (10.9 mg/cm2)
24Ne5+ , Ibeam ~ pps
beam on target for 7 days
setup: Vamos + EXOGAM
45°
EXOGAM 11 detectors
(2 without Compton shield)
Typical count rates:
Ions: 30/min  Total Ion counts: 7*24*60*30 =
 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

7. 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)

8. 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 
to get to O  ~ 107
N.B: to have gamma info. Need to go to 108