scholarly journals Comment on Recent Results for 40Ca Giant Resonances obtained from the 40Ca(3He, 3He')40Ca ?36 Ar +a Reaction

1979 ◽  
Vol 32 (3) ◽  
pp. 279
Author(s):  
D Branford
Keyword(s):  
Inelastic Scattering ◽  
Excitation Function ◽  
Ground State ◽  
Giant Dipole Resonance ◽  
Giant Resonance ◽  
Resonance Excitation ◽  
Giant Resonances ◽  
Resonance States ◽  
Dipole Resonance ◽  
Reaction Proceeds

Yamagata et at. (1978) have recently made measurements on 40Ca giant resonance states using the 3He inelastic scattering reaction. It is shown here that the 3He spectrum obtained in coincidence with 0( particles leading to the 36 Ar ground state is similar in shape to the previously reported 36 Ar(O(, l'o)40Ca giant dipole resonance excitation function. The assignments of JX = 0+ and 3- (tentative) made to the 14�2 and 16�7 MeV states of 40Ca respectively are reconsidered. It is concluded that the (3He, 3He') data could be explained by assuming that the reaction proceeds through JX = 1 - giant dipole states.

DOUBLE GIANT RESONANCES

1994 ◽  
Vol 03 (01) ◽  
pp. 39-99 ◽  
Author(s):  
SHAUL MORDECHAI ◽  
C. FRED MOORE
Keyword(s):  
Giant Dipole Resonance ◽  
National Laboratory ◽  
Heavy Ion ◽  
Resonance Excitation ◽  
Giant Resonances ◽  
Los Alamos National Laboratory ◽  
Double Charge Exchange ◽  
Dipole Resonance ◽  
Isobaric Analog ◽  
Double Charge

A long-standing issue in nuclear structure is whether double giant resonances do exist. Exotic excitations like the double giant-dipole were predicted for many years but not observed experimentally until recently. Several experiments have been carried out at Los Alamos National Laboratory and other laboratories to search for these new collective modes of the nucleus. The results discover the existence of two previously unobserved types of double giant resonances. This work presents a review of the pion double charge exchange data and the analysis which support the existence of two such exotic vibrational nuclear modes: the giant dipole resonance built on the isobaric analog state and the double isovector giant-dipole resonance. Excitation of multiphonon states also becomes a very likely process in relativistic heavy-ion reactions where a direct identification of the double giant-dipole resonance has been reported recently.

scholarly journals Coulomb excitation of the giant dipole resonance in light-ion inelastic scattering fromPb208

1981 ◽  
Vol 24 (5) ◽  
pp. 2179-2187 ◽  
Author(s):  
T. Izumoto ◽  
Y. -W. Lui ◽  
D. H. Youngblood ◽  
T. Udagawa ◽  
T. Tamura
Keyword(s):  
Inelastic Scattering ◽  
Giant Dipole Resonance ◽  
Coulomb Excitation ◽  
Dipole Resonance

The inelastic scattering of protons by magnesium, aluminium and other light elements

1950 ◽  
Vol 201 (1066) ◽  
pp. 348-365 ◽  
Keyword(s):  
Angular Distribution ◽  
Energy Spectrum ◽  
Inelastic Scattering ◽  
Excitation Function ◽  
Ground State ◽  
Proportional Counter ◽  
Complex Structure ◽  
Theoretical Discussion ◽  
Light Elements ◽  
Mev Protons

The energy spectrum of 4.5 MeV protons scattered by some light elements was determined by using a proportional counter in conjunction with absorbing foils. Magnesium gave groups attributed to levels at 1.36 ± 0.03 and 1.82 ± 0.04 MeV respectively above the ground state, the former being almost certainly associated with 24 Mg. The angular distribution and excitation function of this group were examined in some detail. The proton groups from aluminium corresponded to levels at about 1 and 2.15 ± 0.05 MeV respectively above the ground state. The lower level has a complex structure and probably consists of two levels at about 0.80 and 0.97 ± 0.02 MeV, the amplitudes of the corresponding proton groups showing a marked angular dependence. No inelastically scattered protons were observed from carbon, oxygen, or copper, while beryllium gave a group consistent with the existence of a metastable state in 9 Be at 2.39 ± 0.05 MeV above the ground state. A short theoretical discussion of the mechanism of the process is given which suggests that inelastic scattering is predominantly a ( p, p ) process involving formation of a compound nucleus.

Theory of multiple giant dipole resonance excitation

1999 ◽  
Vol 60 (1) ◽  
Author(s):  
B. V. Carlson ◽  
M. S. Hussein ◽  
A. F. R. de Toledo Piza ◽  
L. F. Canto
Keyword(s):  
Giant Dipole Resonance ◽  
Resonance Excitation ◽  
Dipole Resonance

scholarly journals Scaling of the giant dipole resonance widths in hot rotating nuclei from the ground state values

2008 ◽  
Vol 78 (6) ◽  
Author(s):  
Srijit Bhattacharya ◽  
Deepak Pandit ◽  
S. Mukhopadhyay ◽  
Surajit Pal ◽  
S. R. Banerjee
Keyword(s):  
Ground State ◽  
Giant Dipole Resonance ◽  
Dipole Resonance ◽  
Rotating Nuclei

GIANT RESONANCES IN EXOTIC SPHERICAL NUCLEI WITHIN THE HF+RPA APPROACH

2004 ◽  
Vol 13 (01) ◽  
pp. 175-179 ◽  
Author(s):  
S. PERU ◽  
J. F. BERGER
Keyword(s):  
Giant Dipole Resonance ◽  
Resonance Energy ◽  
Exotic Nuclei ◽  
Giant Resonances ◽  
Dipole Resonance ◽  
Spherical Nuclei

The energies and characteristics of giant resonances obtained from HF+RPA calculations with the Gogny force are derived in three doubly magic exotic nuclei. The results show a lowering of the monopole resonance energy compared to systematic values in stable nuclei, in particular in 78 Ni . The Isovector Giant Dipole Resonance (IVGDR) in the two tin isotopes appears splitted into two major peaks.

Fine structure in the photoneutron spectra from praseodymium-141 and lead

1970 ◽  
Vol 48 (8) ◽  
pp. 950-953 ◽  
Author(s):  
K. G. McNeill ◽  
J. W. Jury ◽  
J. S. Hewitt
Keyword(s):  
Fine Structure ◽  
Excited State ◽  
Energy Spectrum ◽  
Cross Section ◽  
Ground State ◽  
Giant Dipole Resonance ◽  
Daughter Nucleus ◽  
State Transitions ◽  
Dipole Resonance ◽  
Section Curve

Careful measurements of the energy spectrum of photoneutrons ejected from praseodymium and from natural lead show that there are peaks on top of the expected smooth spectrum. Comparison with the recent cross-section studies, which indicate structure on the giant dipole resonance for these nuclei, shows agreement between the energies of the peaks found in the present work and the energies En = E−Qi where E corresponds to a peak in the cross-section curve and Qi is the threshold for producing a given state in the daughter nucleus. Only ground state transitions (for Pr) or ground state and the first two excited state transitions (for Pb) need be invoked.

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