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FRIB Workshop/Nov.2008
ωh2
2∑ irωh3
1
3Yri∑
⟩⟨=
2rm
KE AGMR h ⟩⟨
+=
2
2527
3
7
rm
KE
FA
ISGDR
εh
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
112Sn
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
From EGMR and EISGDR to K∞
><=
2
2
rm
KE AGMR
h
342
2
31 −−
∞ +⎟⎠
⎞⎜⎝
⎛ −++= AZK
AZNKAKKK cousymsurA
However, the available GMR data can lead to a wide range of values for K∞ (100--500 MeV!)So, "microscopic approach":
Select "suitable" effective interactions.
Calculate the GMR strength distributions in an RPA approach
Compare with the experimental EGMR and EISGDR
K∞
FRIB Workshop/Nov.2008
This number is consistent with both GMR and ISGDR Data and with non-relativistic and relativistic calculations
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
Excitation energy spectra at 0 deg
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
112 114 116 118 120 122 12414
15
16
17
This work Colo Piekarewicz Texas A& M
m1/m0 (MeV)
A
Why are tins so “Fluffy”?
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
K = -500 (50)
FRIB Workshop/Nov.2008
Data from H. Sagawa et al., Phys. Rev. C 76, 034327 (2007)Data from H. Sagawa et al., Phys. Rev. C 76, 034327 (2007)
FRIB Workshop/Nov.2008
G. Colo’s talk on Saturday
FRIB Workshop/Nov.2008
G. Colo’s talk on Saturday
FRIB Workshop/Nov.2008
Towards very neutron-rich nuclei
K
Kcore and Kskin
“soft GMR” akin to pigmy GDR’s.
Need inverse reactions2H, 4He, or 6Li targetsbeams of 35-100 MeV/A
First experiment performed at
GANIL
56Ni + 2H, with active target MAYA
FRIB Workshop/Nov.2008
MAYA
Drift
chamberMoving flap
Si wall
CsI wall
Diamond
Ionization
chamber
Au foil
MAYA @ GANIL
FRIB Workshop/Nov.2008
d break-up
# co
unts
/MeV
C. Monrozeau et al., Phys. Rev. Lett. 100, 042501 (2008)
58Ni (d, d’)
MAYA @ GANIL
FRIB Workshop/Nov.2008
Analysis with Gaussian fits
FRIB Workshop/Nov.2008
Multipole Decomposition Analysis
FRIB Workshop/Nov.2008
FRIB Workshop/Nov.2008
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