  A prime question in the formation and early evolution of the Solar system
studies is to discern the source(s) of short-lived now extinct nuclides and to
determine the ab-initio isotopic composition of our Solar System (ref. 1). The
proposed genesis of a short-lived now extinct radionuclide,10Be, by spallation
reactions of carbon and oxygen led to the hypothesis of enhanced irradiation in
the early Solar system (ref. 2-8). An alternative scenario of production of
10Be (t1/2 =1.386 +- 0.016 million years (ref.9)) by neutrino process in a low
mass star (11.8Msun) core collapse supernova has been recently suggested (ref.
10) that can explain the observed abundance of 10Be in the early Solar System.
Here, we report well resolved excesses in 7Li/6Li of up to ~21.5 percent in a
Type B1 Ca,-Al rich inclusion (CAI) from the Efremovka meteorite that correlate
with 9Be/6Li, suggestive of in situ decay of 7Be. The in situ decay of 7Be,
with characteristic half-life of 53.12+- 0.07 days (ref. 11) to 7Li, entails
multiple episodes of enhanced irradiation in the ESS. The short half-life of
7Be limits its production by interaction of Solar energetic particles with the
nebular gas and solids and provides constraints on genealogy and chronology of
CAIs. Irradiation of precursor solids/gas of CAIs of Solar composition by a
superflare (Lx=10 exp(32) erg/sec) during the terminal phase of class I or II
of pre-main sequence stages of the Sun cogently explains the isotopic
properties, distinctive petrographic features, and diffusivity constraints in
the CAI.
