Статья

Population of hyperdeformed structures in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Dy</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>152</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>from proton-gamma coincidence experiments

G. ViestiINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyM. LunardonINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyD. BazzaccoINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyR. BurchINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyD. FabrisINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyS. LunardiINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyN. H. MedinaINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyG. NebbiaINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyC. Rossi-AlvarezINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyG. de AngelisINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyM. De PoliINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyE. FiorettoINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyG. PreteINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyJ. RicoINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyP. SpolaoreINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyG. VedovatoINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyA. BrondiINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyG. La RanaINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyR. MoroINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, ItalyE. VardaciINFN and Dipartimento di Fisica dell’Universitá di Padova, I-35131 Padova, Italy

1995lv

ABI

Аннотация

The ridge structure with \ensuremath{\Delta}${\mathit{E}}_{\ensuremath{\gamma}}$=\ifmmode\pm\else\textpm\fi{}30 keV, recently observed in the reaction 187 MeV $^{37}\mathrm{Cl}$${+}^{120}$Sn and attributed to a hyperdeformed nuclear shape, has been confirmed in a new proton-\ensuremath{\gamma} coincidence experiment and assigned to the $^{152}\mathrm{Dy}$ nucleus. Estimates of the cross section for the population of the 30 keV ridge and for the associated entry states have been obtained. The proton spectra in coincidence with \ensuremath{\gamma} rays of different Dy isotopes show effects related to the exit channel and to the angular momentum but they are scarcely sensitive to the selection of different shapes (oblate, normal deformed prolate, superdeformed) in the same residual nucleus $^{152}\mathrm{Dy}$. The energy of the protons in coincidence with the \ensuremath{\Delta}${\mathit{E}}_{\ensuremath{\gamma}}$=\ifmmode\pm\else\textpm\fi{}30 keV ridge is however larger than expected. This effect is discussed in the framework of the fission-evaporation competition.

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Идентификаторы

DOI: 10.1103/physrevc.51.2385

Цитирования и источники

Цитирований: 3Использованных источников: 0

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