Isospin dependence in the odd-even staggering of nuclear binding energies.
نویسندگان
چکیده
The FRS-ESR facility at GSI provides unique conditions for precision measurements of large areas on the nuclear mass surface in a single experiment. Values for masses of 604 neutron-deficient nuclides (30 < or = Z < or = 92) were obtained with a typical uncertainty of 30 microu. The masses of 114 nuclides were determined for the first time. The odd-even staggering (OES) of nuclear masses was systematically investigated for isotopic chains between the proton shell closures at Z = 50 and Z = 82. The results were compared with predictions of modern nuclear models. The comparison revealed that the measured trend of OES is not reproduced by the theories fitted to masses only. The spectral pairing gaps extracted from models adjusted to both masses, and density related observables of nuclei agree better with the experimental data.
منابع مشابه
The Odd-Even Z Isospin Anomaly In The Yields From High-Energy Reactions
The expression "odd-even Z isospin anomaly" – introduced by L. B. Yang et al. [1] in 1999 – indicates the experimental evidence that the elemental even-odd effect decreases with increasing neutron-richness of the system. Since 1999, the analysis of experimental production cross-sections of final products of several nuclear reactions at very different energies confirmed the existence of this eff...
متن کاملمحاسبه و بررسی سیستماتیکی پارامتر چگالی ترازهای هسته‌ای
The knowledge of nuclear reaction rates is important for studying energy production and nucleosynthesis, especially in reactions including nuclei far from stability line, which are not accessible experimentally so far and thus it is necessary to be able to predict reaction cross sections in low excitation energies. Nuclear level density is one of the important key quantities in many nuclear phy...
متن کاملar X iv : n uc l - th / 0 40 70 86 v 1 2 3 Ju l 2 00 4 Staggering behavior of 0 + state energies in the Sp ( 4 ) pairing model
We explore, within the framework of an algebraic sp(4) shell model, discrete approximations to various derivatives of the energies of the lowest isovector-paired 0 states of atomic nuclei in the 40 ≤ A ≤ 100 mass range. The results show that the symplectic model can be used to successfully interpret fine structure effects driven by the proton-neutron (pn) and like-particle isovector pairing int...
متن کاملar X iv : n uc l - th / 0 60 70 62 v 1 2 7 Ju l 2 00 6 Spin projection in the shell model Monte Carlo method and the spin distribution of nuclear level densities
We introduce spin projection methods in the shell model Monte Carlo approach and apply them to calculate the spin distribution of level densities for iron-region nuclei using the complete (pf+g9/2)shell. We compare the calculated distributions with the spin-cutoff model and extract an energydependent moment of inertia. For even-even nuclei and at low excitation energies, we observe a significan...
متن کاملSpin projection in the shell model monte carlo method and the spin distribution of nuclear level densities.
We introduce spin projection methods in the shell model Monte Carlo approach and apply them to calculate the spin distribution of level densities for iron-region nuclei using the complete (pf + g9/2) shell. We compare the calculated distributions with the spin-cutoff model and extract an energy-dependent moment of inertia. For even-even nuclei and at low excitation energies, we observe a signif...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 95 4 شماره
صفحات -
تاریخ انتشار 2005