Higher spin states in neutron rich nuclei
1992; Mexican Society of Physics; Volume: 38; Linguagem: Inglês
ISSN
2683-2224
AutoresShujun Zhu, Xin Zhao, J. H. Hamilton, A. V. Ramayya, W.C. Ma, L.K. Peker, J. Kormicki, Xuhai Hong, W.B. Gao, J. K. Deng, I.Y. Lee, Noah R. Johnson, F. K. McGowan, C. E. Bemis, J. D. Cole, R. Aryaeinejad, G. M. Ter‐Akopian, Yu. Ts. Oganessian,
Tópico(s)Nuclear physics research studies
ResumoNuclei on the neutron rich side of beta stability have long been of interest for nuclear structure studies because they probe different regions of the single particle spectrum and different shell gap combinations for both spherical and deformed shapes. However, such nuclei have been a difficult challenge experimentally. Much information has been gained about the properties of neutron rich nuclei at low spin from the study of radioactive isotopes produced in neutron induced, and more recently, proton induced fission of uranium. Such studies have been made possible by the use of isotope separators on line to reactors and more recently to low energy proton accelerators. However, to test many of the theoretical predictions of nuclear models one needs information about the higher spin states in nuclei in addition to their low spin states populated in radioactive decays. Higher spin states in neutron rich nuclei have been an even more difficult challenge than the lower spin states accessible through decay studies. One cannot reach the higher spin states in these nuclei by heavy ion fusion evaporation in reactions as carried out extensively for proton rich nuclei. Many years ago prompt spontaneous fission studies were used to suggest for the first timemore » that {sup 98}Sr and {sup 100}Zr had unusually large ground state of deformations. The availability of higher efficiency multi-detector arrays of Compton suppressed Ge detectors has brought on a renewed interest in studies of the prompt gamma rays of the fragments from spontaneous and induced fission. Groups at Argonne, Daresbury, and a Vanderbilt-Oak Ridge-Idaho-Dubna collaboration have carried out several such studies from spontaneous and heavy-ion induced fission which have revealed new insights into our knowledge of neutron rich nuclei. This paper is primarily a review of these studies, including recent, unpublished results.« less
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