E.Clément Novembre 2011
In-beam and isomer spectroscopy in the third island of inversion at EXOGAM+VAMOSE.Clément (GANIL)
E.Clément Novembre 2011
Presence of core coupled states : Fe-like and Ni-likeD.Pauwels et al., PRC 79 (2009)A.Dijon et al, PRC 83 (2011)
Onset of deformation in Fe isotopesJ.Ljungvall et al., PRC 81 (2010)W.Rother et al., PRL 106 (2011)
Presence of single particle, collective and core-coupled states.I.Stefanescu et al., PRL 100 (2008)
68Ni
69Cu68Cu
67Co
67Ni
70Zn
70Cu
69Ni
66Co 68Co
66Fe
65Mn
65Fe 67Fe
65Co
64Fe
64Mn63Mn
Weakness of the N=40 shell gapM. Bernas et al., PLB 113 (1982)R.Broda et al., PRL 74 (1995)O.Sorlin et al.,PRL 88 (2002)C. Guénaut et al., PRC 75 (2007)
Core polarization O. Perru et al., PRL 96 (2006)
70Ni
E.Clément Novembre 2011
68Ni
69Cu68Cu
67Co
67Ni
70Zn
70Cu
69Ni
66Co 68Co
66Fe
65Mn
70Ni
65Fe
69Co
67Fe
69Cu : p(2p-1h) Single particle state by B(E2) measurement (I.Stefanescu et al., PRL 100 (2008) )
67Co : p(1p-2h)Shape isomer at N=40 : proton intruder state p (p1/2)+1 (D.Pauwels et al . PRC 78 (2008))
68Ni must present a p(2p-2h)intruder state withE(p(2p-2h) )=E(p(2p-1h) )+E(p(1p-2h))
p(2p-2h) intruder states at low energy π-ν residual energy.
0+ state (D.Pauwels et al . PRC 82 (2010))
E.Clément Novembre 2011
238U 6.33 A MeV
70Zn target Sed1
Sed2
11 EXOGAMGe detectors
No Dipole
45°Ionisation chamber (3 pads) + 4 Si detectors
2 Ge Eurogam phase 1
+2 Ge EXOGAM
detectors
VAMOS Spectrometer
MWPC
Q1Q2
coun
ts
∆Z/Z =1.1%
∆M/M=1.2%
Z identification
M identification
E.Clément Novembre 2011
168(1) keV
Prompt
69Cu67Ni69Ni
68Ni Isomer
PRELIMINARY
T1/2=216 +65/-50 nsIsomer
A. Dijon et al, to be submitted very soon …
E.Clément Novembre 2011
Gated on transitions in 67Ni
Gated on transitions in 69Cu
Gated on transitions in 69Ni
Gated on the 168 keV transition
Observed just for Z=28
E.Clément Novembre 2011
168(1) keV
Prompt
69Cu67Ni69Ni
68Ni IsomerT1/2=216 +65/-50 ns
A. Dijon et al, to be submitted very soon …
E.Clément Novembre 2011
168(1) keV
Prompt
69Cu67Ni69Ni
68Ni IsomerT1/2=216 +65/-50 ns
Compatible withsmall B(E2) value
PromptTransitions Half-life
E1 0.1 ps
E2 300 ns
M1 6 ps
M2 20 μs
E.Clément Novembre 2011
0+
0+1
0+3
2+1
4+1
2+2
5-25-
1
0+m2
68Ni
π(f7/2)-2
(1/2-m)
(7/2-)g.s
67Co
491
Shape isomerD.Pauwels et al.,
PRC 78 (2008)
0+g.s
66Fe
2+
B(E2
) =21
W.u
575
π(f7/2)-2
DeformedW.Rother et al., PRL 106 (2011)
Shape Coexistence scenario
Remarkable agreement with the predited position from the p(1p-2h) in 67Co and p(2p-1h) in 69Cu p(2p-2h) state Suggest the microscopical configuration
D. Pauwels et al, PRC 82, 027304 (2010)
* 70Zn(14C,16O)68Ni M. Girod et al PRC 37 (1988), at the Orsay Tandem
π(f7/2)-2 (p3/2)+1
E.Clément Novembre 2011
0+
0+1
2+1
0+m2
8+1
…
g9/2 d5/2p1/2f5/2p3/2f7/2
f7/2 p3/2 f5/2 p1/2
CalculatedGS0+
1
0+2
neutron
proton
Correlation energy : -30.9 MeVQ² = 4520 e²fm4 b ~ 0.4
LSSM – LPNS : F. Nowacki, K. Sieja for A. Dijon et al, to be submitted very soon …
Correlation energy : -7.6 MeVQ² = 899 e²fm4 b ~ 0.18
π(f7/2)-2
Occ
upat
ion
num
ber
Q² = 1579 e²fm4 b ~ 0.24
B(E2)cal= 0.9 W.u Exp : < 1.4 W.u (E0?)
E.Clément Novembre 2011
M. Martini, S. Péru for A. Dijon et al, to be submitted very soon …
68NiHFB-D1S
fully consistent QRPA calculations with D1S interaction
× Not p
rese
nt in th
e
ph-RPA ca
lculatio
ns× N
ot pre
sent i
n the
ph-RPA ca
lculatio
ns
p
p
n
E.Clément Novembre 2011
The solenoid mode in this experiment shows interesting results:Prompt and delayed gamma rays in coincidenceLifetime of isomer
A new isomer has been identified in 68Ni
Interpreted as a 2p-2h proton intruder superdeformed state across the Z=28 major shell closure
In agreement with SM calculations using the recent LPNS interaction In agreement with QRPA calculations
Similar microscopic configuration with 67mCo and 66Fe Shape coexistence in 68Ni
E.Clément Novembre 2011
Collaboration
E.Clément Novembre 2011
E.Clément Novembre 2011
S.M. Lenzi, F.Nowacki, A.Poves and K.Sieja, PRC 82 (2010)
K.Heyde and J.L. Woods, Rev.Mod.Phys (in press)
-3.8 MeV
F.Nowacki and K.Sieja for A. Dijon et al (2011)
Correlation energy : -30.9 MeVQ² = 4520 e²fm4 b ~ 0.4
Correlation energy : -7.6 MeV Q² = 899 e²fm4 b ~ 0.18
D.Pauwels et al., PRC 82 (2010)
E.Clément Novembre 2011
M. Bernas et al PLB B113,(1982)
Remember, at this time the 2+ at 2033 keV was not known : the 2.20(3) MeV state interpreted as a the 2+1
state
M. Girod et al PRC 37 (1988)
A 0+ state ? : Looking at the past …
E.Clément Novembre 2011
A 0+ state ? : Looking at the past …
M. G
irod et al PRC 37 (1988)