E. Sahin, G. de Angelis Breaking of the Isospin Symmetry and CED in the A 70 mass region: the T z...
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Transcript of E. Sahin, G. de Angelis Breaking of the Isospin Symmetry and CED in the A 70 mass region: the T z...
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E. Sahin, G. de Angelis
Breaking of the Isospin Symmetry and CED in the A70 mass region: the T
z=-1 70Kr
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N~Z A=70 Nuclei: 70Se, 70Br, 70KrCharacteristic features can be extracted through CED?
Strong Collective Effects (Np=Nn) (Shape co-existence)Nuclear Isospin Symmetry
A=70 isobaric nuclei has an unusual behavior of the CED, a negative tendency with increasing spin.
Strong Collective Effects (Np=Nn)
Shape co-existence
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Coulomb Energy Difference (CED)
But in reality, Isospin non-conserving interactions with Coulomb force break the isospin symmetry!!
A plot of CED with increasing angular momentum will be a good tool to study the collective properties of the nuclei N/=Z
D.D. Warner et al.,Nature Physics 2, 311 (2006)
M.A. Bentley, S. Lenzi, Prog.Part.Nucl.Phys. (2006)
Tz>=Tz<+1CED(Jπ)=E
Jπ(T
z<)-E
Jπ(T
z>)
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Negatif CED values in A=70 isobars
CED(2+)=-11 keV
CED(4+)=-36 keV
CED(6+)=-37 keV
Tz< Tz>70Br:G.de Angelis Eur. Phys.J.A.12,51 (2001)
N. Singh et al., Phys.Rev.C75, 061301 (2007)
Coulomb Energy Difference (CED)
70Se:J. Ljungvall et al., PRL 100, 102502 (2008)
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Excited Vampire Predictions Microscopic description of mirror nuclei in the A=70 mass region
Shape coexistence and mixing
70/29
p/o o/p
81/18
95/4
84/16
Mixing ratios
A.Petrovici Nuc.Phy. A 728, 396 (2003)70Br:G.de Angelis Eur.Phys.J.A.12,51 (2001)
Isospin symmetric G-matrix(A) + Coulomb Interaction between valence protons
70Se:J. Ljungvall et al., PRL 100, 102502 (2008)
Exp. data 66As: G. de Angelis (to be submitted)
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Excited Vampire Predictions
Vampire Calculations:
First minimum is predominantly prolate in 70BrFirst minimum is predominantly oblate in 70Se
A.Petrovici Nuc.Phy. A 728, 396 (2003)
59/41
p/o o/p
58/41
80/20
64/36
Mixing ratios
59/41
64/36
39/61
57/42
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Excited Vampire Predictions
The Coulomb interaction is included for the valence protons
The mirror nuclei 70Se-70Kr have different shapes in their ground state
The comparison of the microscopic structure of the mirror nuclei 70Se and 70Kr
A.Petrovici private comm.
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Excited Vampire Predictions
B(E2) Values B(E2) Values ee22fmfm44
Ji J
f
70Kr 70Se
2+ 0+ 603 492
4+ + 864 713
6+ + 933 779
342 Exp.J. Ljungvall et al.
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Experiment1neutron-knockout reaction: 71Kr + 9Be →70Kr
71Kr 9Be70Kr
1neutronTarget
56Fe
Identification of the 2+→0+ transition : 71Kr + 9Be → 70Kr Lifetime measurement : 71Kr + 56Fe → 70Kr
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Beam Production
LISE++ calculations: LISE++ calculations: Primary beam78Kr 1.3x1010 pps
Be target5000 mg/cm2
Secondary beam 71Kr ~ 100 pps at 170 MeV/u
Be target1000 mg/cm2
AGATA
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Identification of the 2+ → 0+ transition
71Kr on 9Be targetd
target=1 g/cm2
Ibeam
=100 pps=2 mb (for 1n knock-out) =20% (1 MeV) N=200 day-1
1-2 days of beamtime
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Lifetime determination
71Kr on 56Fe targetd
target=700 mg/cm2
Ibeam
=100 pps=2.7 mb (for 1n knock-out) =20% (1 MeV) N=35 day-1
2+
0+
950
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955 keV
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