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Nuclear Theory·nucl-th

Wednesday·September 6, 2017

8 papers—6 primary·2 cross-listed

All8Primary6Cross-lists2
  1. 01

    Double Gamow-Teller transitions and its relation to neutrinoless decay

    Noritaka Shimizu🇯🇵 · Javier Menéndez🇯🇵 · Kentaro Yako🇯🇵

    We study the double Gamow-Teller (DGT) strength distribution of Ca with state-of-the-art large-scale nuclear shell model calculations. Our analysis shows that the centroid energy of the DGT giant resonance depends mostly on the isovector pairing interaction, while the resonance width is more sensitive to isoscalar pairing. Pairing correlations are also key in neutrinoless () decay. We find a simple relation between the centroid energy and width of the Ca DGT giant resonance and %the value of the decay nuclear matrix element. More generally, we observe a very good linear correlation between the DGT transition to the ground state of the final nucleus and the decay matrix element. The correlation, which originates on the dominant short-range character of both transitions, extends to heavier systems including several emitters, and also holds in energy-density functional results. Our findings suggest that DGT experiments can be a very valuable tool to obtain information on the value of decay nuclear matrix elements.

    nucl-thhep-exhep-phnucl-exPRL(2018)·103 citations
  2. 02

    Identifying Inconsistencies in Fission Product Yield Evaluations with Prompt Neutron Emission

    Patrick Jaffke

    We present a self-consistency analysis of fission product yield evaluations. Anomalous yields are determined using a series of simple conservation checks and comparing charge distributions with common parameterizations. The total prompt neutron multiplicity as a function of product mass is derived directly from the independent fission product yields using average charge conservation. This method is checked against Monte Carlo simulations of the de-excitation of the fission fragments in a Hauser-Feshbach statistical decay framework. The derived is compared with experimental data, when available, and used to compare the prompt neutron multiplicity for the various evaluations. Differences in for each evaluation are investigated and possible sources are identified. We also identify fission reactions that are inconsistent with prompt neutron data and propose possible solutions to remedy the observed inconsistencies.

    nucl-thphysics.app-phNucl.Sci.Eng.(2018)·6 citations
  4. 04

    Two-proton capture on the Se nucleus with a new self-consistent cluster model

    D. Hove · E. Garrido · A.S. Jensen · P. Sarriguren · H.O.U. Fynbo · D.V. Fedorov · N.T. Zinner

    We investigate the two-proton capture reaction of the prominent rapid proton capture waiting point nucleus, Se, that produces the borromean nucleus Kr (Se). We apply a recently formulated general model where the core nucleus, Se, is treated in the mean-field approximation and the three-body problem of the two valence protons and the core is solved exactly. The same Skyrme interaction is used to find core-nucleon and core valence-proton interactions. We calculate electromagnetic two-proton dissociation and capture cross sections, and derive the temperature dependent capture rates. We vary the unknown resonance energy without changing any of the structures computed self-consistently for both core and valence particles. We find rates increasing quickly with temperature below ~GK after which we find rates varying by less than a factor of two independent of resonance energy. The capture mechanism is sequential through the proton-core resonance, but the continuum background contributes significantly.

    nucl-thastro-ph.SRPLB(2018)·3 citations
  5. 05

    The tightly bound nuclei in the liquid drop model

    N R Sree Harsha

    In this paper, we shall maximise the binding energy per nucleon function in the semi-empirical mass formula of the liquid drop model of the atomic nuclei to analytically prove that the mean binding energy per nucleon curve has local extrema at A = 58.6960, Z = 26.3908 and at A = 62.0178, Z = 27.7506. The Lagrange method of multipliers is used to arrive at these results, while we have let the values of A and Z take continuous fractional values. The shell model that shows why 62Ni is the most tightly bound nucleus is outlined. A brief account on stellar nucleosynthesis is presented to show why 56Fe is more abundant than 62Ni and 58Fe. We believe that the analytical proof presented in this paper can be a useful tool to the instructors to introduce the nucleus with the highest mean binding energy per nucleon.

    nucl-thEur.J.Phys.(2018)·1 citation
  6. 06

    Measures of azimuthal correlations in relativistic heavy ion collisions

    G.L. Li🇨🇳 · C.B. Yang🇨🇳 · D.M. Zhou🇨🇳

    Based on the initial state geometrical symmetry for collisions between two identical heavy ions at high energy, the general form for the one- and two-particle azimuthal distributions is deduced. Relation between these distributions and the usual flow parameters is discussed. New measures for the azimuthal correlations are suggested. Some numerical results on the values of the measures are shown from an event generator for Au+Au collisions with different colliding centralities at 200 GeV.

    nucl-thJ.Phys.G(2018)·1 citation

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first authorsco-authorsvia INSPIRE