VERY HIGH-SPIN STATES IN NUCLEI

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The continuum {gamma}-ray spectrum following neutron emission in a (HI,xn) reaction consists of a high-energy tail, the statistical cascade, and a lower-energy bump, the yrast cascade, which contains most of the intensity and consists mostly of stretched E2 transitions. Thus, a good approximation to the average angular momentum carried by the {gamma}-rays is 2{bar N}{sub {gamma}}. Under favourable conditions, effective moments of inertia can be deduced for states up to the top of the {gamma}-ray cascade. The maximum angular momentum the cascades is probably limited by {alpha}-emission for nuclei with A < 150 and by fission for those with A ... continued below

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40 p.

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Diamond, R.M. April 1, 1977.

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The continuum {gamma}-ray spectrum following neutron emission in a (HI,xn) reaction consists of a high-energy tail, the statistical cascade, and a lower-energy bump, the yrast cascade, which contains most of the intensity and consists mostly of stretched E2 transitions. Thus, a good approximation to the average angular momentum carried by the {gamma}-rays is 2{bar N}{sub {gamma}}. Under favourable conditions, effective moments of inertia can be deduced for states up to the top of the {gamma}-ray cascade. The maximum angular momentum the cascades is probably limited by {alpha}-emission for nuclei with A < 150 and by fission for those with A > 150. Today it is possible to obtain information on nuclei at very high spins, and so see whether there are differences in behaviour from that at low spins. When 100 units of angular momenta are added to a nucleus, we enter a new nuclear regime in which the rotational energy approaches the order of magnitude of the Coulomb and surface energies, and is much larger than pairing and shell effects. As a result, effects on the nuclear shape, on the moments of inertia, even on the modes of decay, might be expected, and there will be an interplay between the single-particle and collective motions to most efficiently carry the angular momentum. The use of heavy ions has made possible the investigation of high-spin states, and there have been three principal classes of studies: (1) Heavy-Ion Coulomb excitation; (2) (Heavy-ion,xn{sub {gamma}}) reactions to study the discrete states up to spin 24-28 {h_bar}; and (3) (Heavy-ion,xn{gamma}) reactions to study the yrast region up to spin 60{h_bar} via continuum {gamma}-rays.

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40 p.

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  • Physics Summer School Meeting, Jindabyne, Australia, February 7-11, 1977

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  • Report No.: LBL-6505
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 991949
  • Archival Resource Key: ark:/67531/metadc1012664

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Office of Scientific & Technical Information Technical Reports

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  • April 1, 1977

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 18, 2017, 12:54 p.m.

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Diamond, R.M. VERY HIGH-SPIN STATES IN NUCLEI, article, April 1, 1977; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1012664/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.