94 research outputs found
Systematic decay studies of even-even ^Nd, ^Gd, ^Hg and ^Pb isotopes
The alpha and cluster decay properties of the ^Nd, ^Gd,
^Hg and ^Pb even-even isotopes in the two mass regions A =
130-158 and A = 180-198 are analysed using the Coulomb and Proximity Potential
Model. On examining the clusters at corresponding points in the cold valleys
(points with same A_2) of the various isotopes of a particular nucleus we find
that at certain mass numbers of the parent nuclei, the clusters emitted are
getting shifted to the next lower atomic number. It is interesting to see that
the change in clusters appears at those isotopes where a change in shape is
occurring correspondingly. Such a change of clusters with shape change is
studied for the first time in cluster decay. The alpha decay half lives of
these nuclei are computed and these are compared with the available
experimental alpha decay data. It is seen that the two are in good agreement.
On making a comparison of the alpha half lives of the normal deformed and super
deformed nuclei, it can be seen that the normal deformed ^Nd, ^Hg
and ^Pb nuclei are found to be better alpha emitters than the super
deformed (in excited state) ^Nd, ^Hg and ^Pb nuclei. The
cluster decay studies reveal that as the atomic number of the parent nuclei
increases the N \neq Z cluster emissions become equally or more probable than
the N=Z emissions. On the whole the alpha and cluster emissions are more
probable from the parents in the heavier mass region (A=180-198) than from the
parents in the lighter mass region (A= 130-158). The effect of quadrupole
({\beta}_2) and hexadecapole ({\beta}_4) deformations of parent and fragments
on half life times are also studied.Comment: 42 pages,19 figure
O elemento popular na obra de Jorge Amado
Pesquisa cientĂfica apoiada pelo CNPq/PIBIC de agosto de 2012 a julho de 2013, que se dedicou ao estudo dos quatro primeiros romances publicados de Jorge Amado: O PaĂs do Carnaval (1931), Cacau (1933), Suor (1934) e JubiabĂĄ (1935). Com o intuito de obter sentidos para o termo âpopularâ, amplamente relacionado ao autor e Ă s suas obras, tal investigação embasou-se em crĂticos contemporĂąneos e em crĂticas da dĂ©cada de trinta publicadas no Boletim de Ariel. TambĂ©m foi utilizado o mĂ©todo de compreensĂŁo de obras apresentado por Umberto Eco nas conferĂȘncias Norton de 1993, para abarcar, a partir de conceitos como o de leitor-modelo, por quem e como Jorge Amado era lido, e se esse leitor-empĂrico difere daquele que os seus romances, denominados Ă s vezes como panfletĂĄrios, buscavam
Does the Constitution Provide More Ballot Access Protection for Presidential Elections Than for U.S. House Elections?
Both the U.S. Constitution and The Federalist Papers suggest that voters ought to have more freedom to vote for the candidate of their choice for the U.S. House of Representatives than they do for the President or the U.S. Senate. Yet, strangely, for the last thirty-three years, the U.S. Supreme Court and lower courts have ruled that the Constitution gives voters more freedom to vote for the candidate of their choice in presidential elections than in congressional elections. Also, state legislatures, which have been writing ballot access laws since 1888, have passed laws that make it easier for minor-party and independent candidates to get on the ballot for President than for the U.S. House. As a result, voters in virtually every state invariably have far more choices on their general election ballots for the President than they do for the House. This Article argues that the right of a voter to vote for someone other than a Democrat or a Republican for the House is just as important as a voterâs right to do so for President, and that courts should grant more ballot access protection to minor-party and independent candidates for the House
Observation of a decoupled band in 123 Cs
The methods of in-beam Îł -ray spectroscopy have been used to study 123 Cs produced by the 115 In( 12 C, 4 n ) reaction. Five coincident stretched E 2 transitions, previously assigned in the literature to 123 Ba, have been identified as members of a decoupled band in 123 Cs.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/45822/1/10050_2005_Article_BF01422105.pd
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