caa a22 4500 465809308 CHVBK 20180323112111.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF02902623 doi (NATIONALLICENCE)springer-10.1007/BF02902623 On the interactions between nucleons in the valence shells of trans-208Pb nuclei [Elektronische Daten] [G. Mouze, C. Ythier] Summary: A lot of information concerning the interaction laws between nucleons in the valence shells of trans-208Pb nuclei can be obtained from experimental mass tables. The proton-neutron interaction energy can be expressed by $$E_{np} = N_p N_n \varepsilon '_{np} $$ , whereN p N n is the number of n-p couples in the valence shells, and $$\varepsilon '_{np} $$ a weak, nearly constant interaction energy per n-p couple. Two methods are proposed for the calculation ofE np. In even-even nuclei, the integral 2p-2p interaction energy is given by $$E_{2p - 2p} = - \mathcal{N}_p (\mathcal{N}_p - 1)\varepsilon _{2p - 2p} /2$$ , where $$\mathcal{N}_p $$ is the number of proton pairs, and $$\varepsilon _{2p - 2p} $$ a weak, nearly constant interaction energy per 2p-2p couple. A similar relation holds for valence neutron pairs. The energy binding all the valence proton pairs to the208Pb core is $$\mathcal{N}_p \bar \sigma _{2p} $$ , where $$\bar \sigma _{2p} $$ is calculable in a simple way fromZ=84 toZ=92; its value is independent of the number of pairs of nucleons of the other kind in the valence shells. A similar relation holds for valence neutron pairs. Similar laws hold in odd nuclei. The weakness of all these valence shell interaction energies, and the fact that the energy binding an unpaired proton to the208Pb core of odd-Z nuclei decreases rapidly as $$\mathcal{N}_p $$ increases, explain several properties, which are briefly discussed, of trans-208Pb nuclei: repulsion between valence neutrons, feasibility of Oganessian reactions, shell internal energy, and reactivity of the valence nucleons. Società Italiana di Fisica, 1990 21.10 - General and average properties of nuclei nationallicence 25.40 - Nucleon-induced reactions nationallicence Mouze G. Laboratoire de Chimie Atomique, Faculté des Sciences, 06 034, Nice, France aut Ythier C. Laboratoire de Chimie Atomique, Faculté des Sciences, 06 034, Nice, France aut Il Nuovo Cimento A (1965-1970) Società Italiana di Fisica 103/1(1990-01-01), 105-128 103:1<105 1990 103 40763 https://doi.org/10.1007/BF02902623 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02902623 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mouze G. Laboratoire de Chimie Atomique, Faculté des Sciences, 06 034, Nice, France aut NATIONALLICENCE 700 1- Ythier C. Laboratoire de Chimie Atomique, Faculté des Sciences, 06 034, Nice, France aut NATIONALLICENCE 773 0- Il Nuovo Cimento A (1965-1970) Società Italiana di Fisica 103/1(1990-01-01), 105-128 103:1<105 1990 103 40763 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer