Structure ofGe78from theGe

Enhancement of and low excitation of the second state near in Ge isotopes

“…[6] published in 1987. A notable irregularity at N = 40 was observed in the (p, t) and (t, p) reaction cross sections [7,8,9], which is characterized by a drastic drop of the second 0 + excitation energy in 72 Ge. This is an unusually low excited 0 + state, showing a similar character as that of typical doubly-closed-shell nuclei.…”

Implications of the GALLEX source experiment for the solar neutrino problem

“…The theoretical considerations come from evidence [6,7] that the behavior of N ∼ 40 Ge isotopes under changes in the neutron number is spectacularly nonlinear due to the interplay of coexisting spherical and deformed bands. Near N=40 it is possible to produce energetically favored, highly deformed neutron configurations in which a pair of neutrons occupies a Nilsson orbital based on the 1g 9/2 spherical shell.…”

“…The 25% uncertainty results from empirical tests [11,20] of the IAS/Fermi proportionality [21]]. Finally, the 7 Be cross section has the large uncertainty associated with the freedom in BGT(5/2 − ) and BGT(3/2 − ), parameters for which we lack even best values. leading to more stringent constraints on φ( 7 Be).…”

“…Level scheme for71 Ge showing the excited states that contribute to absorption of pp,7 Be, 51 Cr, and 8 B neutrinos. Constraints imposed on BGT(5/2 − ) and BGT(3/2 − ) by Krofcheck et al[12] (small shaded region), by the present reanalysis of the (p,n) results (area enclosed by the dashed lines), and by the 51 Cr source experiment (diagonal lines).…”

“…One motivation for the present study is to consider the role of excited states in 71 Ge in the capture of 51 Cr and 7 Be neutrinos. Electron capture on 51 Cr produces two line sources of neutrinos of energy 746 keV (90%) and 431 keV (10%).…”