2,968 research outputs found

    Lambda hyperonic effect on the normal driplines

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    A generalized mass formula is used to calculate the neutron and proton drip lines of normal and lambda hypernuclei treating non-strange and strange nuclei on the same footing. Calculations suggest existence of several bound hypernuclei whose normal cores are unbound. Addition of Lambda or, Lambda-Lambda hyperon(s) to a normal nucleus is found to cause shifts of the neutron and proton driplines from their conventional limits.Comment: 6 pages, 4 tables, 0 figur

    Isobaric incompressibility of the isospin asymmetric nuclear matter

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    The isospin dependence of the saturation properties of asymmetric nuclear matter, particularly the incompressibility K(X)=K+KτX2+O(X4)K_\infty (X) = K_\infty + K_\tau X^2 + O(X^4) at saturation density is systematically studied using density dependent M3Y interaction. The KτK_\tau characterizes the isospin dependence of the incompressibility at saturation density ρ0\rho_0. The approximate expression KasyKsym6LK_{asy} \approx K_{sym}-6L is often used for KτK_\tau where LL and KsymK_{sym} represent, respectively, the slope and curvature parameters of the symmetry energy at ρ0\rho_0. It can be expressed accurately as Kτ=Ksym6LQ0KLK_\tau=K_{sym}-6L-\frac{Q_0}{K_\infty}L where Q0Q_0 is the third-order derivative parameter of symmetric nuclear matter at ρ0\rho_0. The results of this addendum to Phys. Rev. C 80, 011305(R) (2009) indicate that the Q0Q_0 contribution to KτK_\tau is not insignificant.Comment: 4 pages including 1 table and 1 figur

    A Mass Formula from Light to Hypernuclei

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    Simultaneous description of ordinary and hypernuclei masses by a single mass formula has been a great challenge in nuclear physics. Hyperon-separation energies of about forty Lambda(Λ\Lambda), three Lambda-Lambda(ΛΛ\Lambda\Lambda), one Sigma(Σ\Sigma) and seven Cascade(Ξ\Xi) hypernuclei have been experimentally found. Many of these nuclei are of light masses. We prescribe a new mass formula, called BWMH, which describes the normal and hypernuclei on the same footing. It is based on the modified-Bethe-Weizs\"acker mass formula (BWM). BWM is basically an extension of the Bethe-Weizs\"acker mass formula (BW) for light nuclei. The parameters of BWM were optimized by fitting about 3000 normal nuclei available recently. The original Bethe-Weizs\"acker mass formula (BW) was designed for medium and heavy mass nuclei and it fails for light nuclei. Two earlier works on hypernuclei based on this BW show some limitations. The BWMH gives improved agreement with the experimental data for the line of stability, one-neutron separation energy versus neutron number spectra of normal nuclei, and the hyperon-separation energies from hypernuclei. The drip lines are modified for addition of a Λ\Lambda hyperon in a normal nucleus.Comment: Presented at the "XXIX Mazurian Lakes Conference on Physics: Nuclear Physics and the Fundamental Processes, Piaski, Poland, August 30 - September 6, 2005." (7 pages, 1 Table, 1 Figure
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