明人“传奇”称名的观念基础及其渊源

A chemically selective laser ion source has been used in a $\beta$-decay study of heavy Ag isotopes into even-even Cd nuclides. Gamma-spectroscopic techniques in time-resolving event-by-event and multiscaling modes have permitted the identification of the first 2$^+$ and 4$^+$ levels in $^{126}$Cd$_{78}$, $^{128}$Cd$_{80}$, and tentatively the 2$^+$ state in $^{130}$Cd$_{82}$. From a comparison of these new states in $_{48}$Cd with the $E(2^+)$ and $E(4^+)/E(2^+)$ level systematics of $_{46}$Pd and $_{52}$Te isotopes and several recent model predictions, possible evidence for a weakening of the spherical $N=82$ neutron-shell below double-magic $^{132}$Sn is obtained

Search for beta-delayed charged particles from the halo nucleus sup 1 sup 4 Be

In a search for beta-delayed charged particles from sup 1 sup 4 Be we have obtained an upper limit on beta-delayed alpha particles, B(beta alpha)<1.2x10 sup - sup 4 , and found evidence for beta-delayed tritons at intensity of 6x10 sup - sup 5 <B(beta t)<4x10 sup - sup 4 (both at 95% confidence level). By adding information on the beta-delayed neutron branches from direct measurements at low neutron energy and indirect detection via recoiling nuclei at high energy, and by including also information from earlier experiments, we deduce the beta strength distribution from sup 1 sup 4 Be. This differs significantly from shell-model calculations at high excitation energy