The structure of giant resonances in calcium and titanium isotopes. N.G.Goncharova, Iu.A.Skorodumina Skobelzyn Institute of Nuclear Physics, Moscow State.

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Presentation transcript:

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 )

Matrix elements of Hamiltonian

P.Plauger, E.Kashy, Nucl.Phys.A152(1970)609

Number of basic configurations

E1 form factors

46 Ti Isospin factors in excitation and decay

48 Ti Isospin factors in excitation and decay

50 Ti Isospin factors in excitation and decay

E1 form factors at photopoint in 46 Ti

R.E.Pywell, M.N.Thompson ea,Nucl.Phys. A 318 ( 1979)461

E1 form factors at photopoint in 48 Ti

R.Sutton, M.N.Thompson et al, Nucl.Phys. A 339( 1980) Ti(γ,n)

E1 form factors in 50 Ti

50 Ti(γ,n) R.E.Pywell, M.N.Thompson R.A.Hicks, Nucl.Phys. A325(1979).116

Spectroscopy of 40 Ca(d,t) at E p =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-40 q = 1.8 Fm -1

The maximal energies of projectiles in the pick-up reactions and occupation of 1d 5/2 subshell

Spectroscopy of 48 Ca

G.J O’Keefe., M.N Thompson. et al, Nucl.Phys. A469(1987)239

Mean weighted energies for T branches and isospin splitting Bull.RAS,Physics,75(2011) Bull.RAS,Physics,76(2012)

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) 274

Behavior of form factors