The structure of giant resonances in calcium and titanium isotopes. N.G.Goncharova, Iu.A.Skorodumina...
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Transcript of The structure of giant resonances in calcium and titanium isotopes. N.G.Goncharova, Iu.A.Skorodumina...
The structure of giant resonances in calcium and titanium isotopes.
N.G.Goncharova, Iu.A.Skorodumina
Skobelzyn Institute of Nuclear Physics,
Moscow State University
Origins of multipole resonances fragmentation?
E1 in Titanium Isotopes
Particle Core Coupling Shell Model (PCC SM )
'
'
( ),,
( ),1( ' ' ') ( ) : ,J j
i i iJ j
i iAJ T C J E T nlj J T
'
' '
( ), ',
( ),1( ' ' ') ( ' ' ') : ,J j
f f fJ j
A f fJ T J E T n l j J T
ii
i
SÑ
S
Matrix elements of Hamiltonian
( ' )ij j c ij ijH E E V
(1) (2)
' ' ' '' '' ''1 2( )( ) : ( )( )
ij f f
f f
V J V J
J ET j J V J E T j J
int 12 1 2 0 1 1 2 0 1 2 1 1 2 1 2( ) ( ) ( )V r g r r f f g g
48 47pT(p,d) Ti;E 35MeV
46 45pT(p,d) Ti;E 35MeV
P.Plauger, E.Kashy, Nucl.Phys.A152(1970)609
ii
i
SÑ
S
50 49pTi(p,d) Ti; E 45 MeV
ii
i
SÑ
S
Number of basic configurations
E1 form factors
, ,
' ',,,
' '
2 2 1 ( );
( ) ( , , , , ).
T T T
i f
fi
T
J J Jf f T TM i i T f TM i i TM f i
i j j
J T jJT jJTM f i i f i f i f i f
J T
J T M B J TM j O j J Z j j
Z j j C f J J j j T T
20Г 2 ( )i i imk P k S
1/2 1/21 1, (2 1) (2 1) 0
i f
elE SN CM i f i T f T f f E i iF q f f J T TM T T M J T T J T
228
( ) ( )Td F q
46TiIsospin factors in excitation and decay
48TiIsospin factors in excitation and decay
50TiIsospin factors in excitation and decay
E1 form factors at photopoint in 46Ti
R.E.Pywell, M.N.Thompson ea ,Nucl.Phys. A318 (1979)461
E1 form factors at photopoint in 48Ti
R.Sutton, M.N.Thompson et al , Nucl.Phys. A 339(1980)125
48Ti(γ,n)
E1 form factors in 50Ti
50Ti(γ,n)
R.E.Pywell, M.N.Thompson R.A.Hicks, Nucl.Phys. A325(1979).116
Spectroscopy of 40Ca(d,t) at Ep=52 MeV
P. Doll, G.J. Wagner, K.T. Knopfle, Nucl.Phys. A263(1976) 210
E1 in 40 Ca
A.Veyssiere et al., Nucl. Phys.A227(1972)513
M6 in Ca-40q = 1.8 Fm-1
5/2 7/21d 1f
The maximal energies of projectiles in the pick-up reactions and occupation of 1d5/2 subshell
Spectroscopy of 48Ca
G.J O’Keefe., M.N Thompson. et al, Nucl.Phys. A469(1987)239
Mean weighted energies for T< and T>
branches and isospin splitting
Bull.RAS,Physics,75(2011)1540-1543Bull.RAS,Physics,76(2012)1085-1088
SUMMARY
1.The calculations of the E1 strengths in calcium and titanium isotopes have shown that one of the main origins of resonances’ fragmentation is the energy spread of final nuclei states. This factor could be taken into account in PCCSM.
• 2.For the realistic description of the nuclei disintegration due to interactions with electromagnetic fields spectroscopic information on direct reactions should be obtained with energy of projectiles at least on 15 MeV higher than the maximum energy of the photon.
The structure of pigmy resonances = a problem
T. Hartmann et al, Phys. Rev. Lett.,.85 (2000) 27448Ca(e,e ')
Behavior of form factors E1