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Nuclear Theory·nucl-th

Thursday·March 19, 2015

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    [Submitted on 18 Mar 2015]

    Nucleon-nucleon resonances at intermediate energies using a complex energy formalism

    G. Papadimitriou🇺🇸 · J.P. Vary🇺🇸

    We apply our method of complex scaling, valid for a general class of potentials, in a search for nucleon-nucleon S-matrix poles up to 2 GeV laboratory kinetic energy. We find that the realistic potentials JISP16, constructed from inverse scattering, and chiral field theory potentials NLO and NLO support resonances in energy regions well above their fit regions. In some cases these resonances have widths that are narrow when compared with the real part of the S-matrix pole.

    Comments:
    7 pages, 5 figures, 2 Tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1503.05277 [pdf]
    PLB(2015)·9 citations
  2. 02

    [Submitted on 18 Mar 2015]

    Signature of nonexponential nuclear decay

    A Ray · A K Sikdar · A De

    Precision tests of decay law of radioactive nuclei have not so far found any deviation from the exponential decay law at early time, as predicted by quantum mechanics. In this paper, we show that the quantum decoherence time (i.e. the timescale of nonexponential decay) of the quasifission or fission process should be of the order of attosecond considering the atom of the fissioning nucleus as a quantum detector. Hence, the observed decay timescale of the quasifission or fission process of even highly excited (EX greater than 50 MeV) transuranium and uraniumlike complexes should be rather long (of the order of attosecond) in spite of their very fast exponential decay timescale (of the order of zeptosecond) as measured by the nuclear techniques. Recent controversy regarding the observation of very long (of the order of attosecond ) and very short (of the order of zeptosecond ) quasifission or fission timescales for similar systems at similar excitation energies as obtained by direct techniques (crystal blocking, X ray fission fragment) and nuclear techniques could be interpreted as evidence for nonexponential decays in nuclear systems

    Comments:
    17 pages, 1 figure
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1503.05346 [pdf]
    0 citations

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first authorsco-authorsvia INSPIRE