1. Multinucleon transfer reactions in the 40Ar+208Pb
and 36S+208Pb systems
F. Haas, S. Courtin et al., IPHC, Strasbourg
R. Chapman et al., University of Paisley
S. Szilner et al, RBI, Zagreb
L. Corradi, A. Stefanini et al., LNL, Legnaro

2. Our collaborations with LNL
Early steps:
Entrance-channel effects in the 58Ni+60Ni fusion reaction
GASP experiment, at/below the Coulomb barrier (CB). Measurement of spin distributions
Collab. A. Stefanini, D. Ackermann.
S. C. et al. Acta Phys.Pol. B30, 1549 (1999) , S.C. et al. Nucl.Phys. A724, 125 (2003)
S.C. et al. 55. Nucl.Phys. A722, 190 (2003).
Collaboration very active since then (A. Stefanini et al.)
Fusion below CB/ down to deep subbarrier energies : from enhancement of fusion
at CB to fusion hindrance effects at deep subbarrier energies (supported by the LEA)
15 publications, recently 40,48Ca + 40,48Ca (down to 20 mb)
… N-rich nuclei, transfer reactions …

3. Multinucleon transfer reactions
Deep inelastic à la Broda
(J. Phys. G 32 (2006) R151)
E > ECB
‘damped collisions, dissipative collisions, quasi-fission, multi-particle transfer’
Choice target and projectile, N-rich regions (out of reach for fusion-evaporation).
Thick targets / Doppler effect / T > 1ps
Complex spectra (several binary reaction channels), high spins
Challenging experiments
Structure of the projectile-like fragments on heavy targets, N/Z

4. First experiments Clean spectra, Doppler corrected …
Strasbourg / Paisley
Deep inelastic, 37Cl (234 MeV) + 160Gd (thick)
EUROBALL IV / Vivitron
N-rich isotopes of Dy (high spin states) and N-rich Cl and S isotopes
36S (Z = 16, N=20) spectra / double gates / yrast line extended to 6+ /
sdfp SM calc.
1st observation of the yrast sequence
of 41Cl (Z=17, N=24))
X. Liang et al., Phys.Rev. C66, (2002)
X. Liang et al., Eur.Phys.J. A 10, 41 (2001)
Clean spectra, Doppler corrected …

5. LNL After the Euroball campaign PRISMA CLARA W = 80 msr (x,y,t) MCP
(x’,y’,t’) MWPPAC
MCP – PPAC: TOF
(DE,E) IC
Z, A, q, clean identification of the fragments
(velocity)
25 Compton-suppressed Ge Clovers
e = 3% for single 1 MeV g

6. Structure of N-rich S, Si, P, Cl isotopesAl
36S (215 MeV) + 208Pb
Prisma (grazing – 56°) + Clara
208Pb (300 mg.cm-2), C backing
Detection of projectile-like fragments
in Prisma : Na (Z=11) to Mn (Z = 25)
X. Liang et al., Phys.Rev. C 74, (2006)

7. 36S + 208Pb
Mass spectra
N=20
Z.M. Wang et al., Phys.Rev. C 83, (2011)
D. O’Donnel et al., Phys.Rev. C 81, (2010)
Z.M. Wang et al., Phys.Rev. C 81, (2010)
Z.M. Wang et al., Phys.Rev. C 81, (2010)
A. Hodsdon et al., Phys.Rev. C 75, (2007)
X. Liang et al., Phys.Rev. C 74, (2006)

8. 36S + 208Pb 38Cl (Z=17,N=21)/ sdpf SM calc. ‘Poves-Nowacki int.’
Experimental
Shell Model
Experimental
38Cl (Z=17,N=21)/ sdpf SM calc. ‘Poves-Nowacki int.’
D. O’Donnell et al., Phys.Rev. C 81, (2010)
Yrast sequence of 36Si (Z=14, N=22) extended/ sdpf SM calc.
Near spherical, X. Liang et al., Phys.Rev. C 74, (2006)
Experimental
Shell Model
37P (Z=15, N=22) (previous exp. revisited)
1 g-ray known previously / sdpf SM calc. Improved ‘Poves-Nowacki int.’ A. Hodsdon et al., Phys.Rev. C 75, (2007)
Experimental
Shell Model
33Si (Z=14, N=19) : intruder negative parity band / 1w PSDPF int. SM calc.
Z.M. Wang et al., Phys.Rev. C 81, (2010)

9. sd nuclei and the Shell Model
For the description of the positive parity sd states, the remarkable success
obtained by the ‘Universal SD’ interaction of Wildenthal and Brown
16O core, nucleus in the sd shell, a 0w interaction
For the description of the negative parity sd states, no interaction existed to
describe these states throughout the sd shell. Such an interaction has been built in
Strasbourg.
4He core, nucleons in the p, sd and fp shells with one jump possible between the p
and sd shell or between the sd and fp shell.
This is a full 1w interaction

10. The new 1w PSDPF interaction
Building blocks :
the 0w CK (Cohen-Kurath) interaction for the p shell
the 0w USDB interaction (Brown) for the sd shell
the 0w SDPF interaction (Nowacki-Poves) for the sdpf shells
the two body cross matrix elements p → sd and sd → pf were obtained through
a fitting procedure on negative parity states at the beginning and end of sd (Antoine)
More details in :
M. Bouhelal et al, Acta Physica Pol. B 40 (2009) 639
M. Bouhelal et al, Eur. Phys. J. A 42 (2009) 529.
M. Bouhelal et al, Nucl. Phys. A 864 (2011) 113.
Not only the energy spectra but also the electromagnetic transitions (Nathan)
M1, E2 for transitions + → + or - → -
E1, M2, E3 for transitions + → -

11. Applications of the PSDPF interaction
the negative parity and deformed bands in the Ne and Na isotopes
the ‘collective’ 3- states throughout
in the second half of the shell, the long lived negative parity states from the deep
inelastic reactions
the negative parity intruder states in the N = 20 isotones 34Si, 35P
and 36S : energy spectra and electromagnetic transitions
In general, the evolution in energy of the 0p, 1p-1h, 2p-2h, 3p-3h ... states as a
function of Z and N for sd nuclei.

12. Chart of sd nuclei with known negative parity states

13. Results from the Prisma+Clara experiment
36S on 208Pb and PSDPF (1 ħw) SM calculations
11/2-
5241
9/2-
5089
9/2-
4892
5379
5153
7/2-
4754
7/2-
4186
4971
4839
3976
4293
4254
p above d5/2
n hole in 1d3/2
n in f7/2
4790
3335
4379
2553
34Si
35P
36S

14. 40Ar + 208Pb @ LNL 40Ar (255 MeV/ALPI) + 208Pb (300mg.cm-2)
54°
Neutron-rich Ar(Z=18) and K(Z=19) isotopes
41Ar (+1n)
11/2-, new
40Ar 2+ x 1n in f7/2
42Ar (Z=18, N=24) (+2n)
2+, 11/2-, Argon isotopes
S. Szilner et al., Phys. Rev. C 84, (2011)

15. 36S + 208Pb @ LNL Lifetimes t > 1 ps RDDS method 34Si 35P 36S
11/2- ps
9/2- ps
9/2- ps ps ps
7/2- ps
7/2- ps
4971 ps fs ps ps ps fs fs
t > 1 ps
RDDS method ps
34Si
35P
36S

16. AgataD - Prisma + Plunger, June 2011
36S + LNL
AgataD - Prisma + Plunger, June 2011
Experimental conditions as close as possible to the Prisma-Clara experiment
Agata
208Pb, Nb backing + Nb degrader
Nb chosen after in beam tests
AgataD –
1st exp. with 5 clusters
59° (±6°)
The Köln Plunger

17. 36S + 208Pb @ LNL AgataD - Prisma + Plunger
Z=16
Z=17
Z=15
+1p,±xn
N=20
Z=14
0p,±xn
-1p,±xn
q=15+
q=14+
q=13+
q=12+
-2p,±xn
Z = 16
A. Goasduff et al.

18. Preliminary 3290 keV Results, lifetimes, next LEA meeting …
A. Goasduff et al.
Results, lifetimes, next LEA meeting …

19. Next …
Fusion reactions far below CB, influence of the neutron excess / LNL electrostatic deflector
Multinucleon transfers / pairing :
PRISMA
Structure (of N-rich …)
Galileo (Ge Clusters / Gasp detectors), C. Ur et al.
F. Haas, S. Courtin et al., IPHC, Strasbourg
R. Chapman et al., University of Paisley
S. Szilner et al, RBI, Zagreb
L. Corradi, A. Stefanini et al., LNL, Legnaro

20. AgataD / Counting rate tests for Plunger experiments