Study of proton capture resonant state of ^{15}O at 7556 keV

Abstract

The slowest reaction in the CNO cycle 14 N(p,γ) 15 O has been studied by populating the E lab p =278 keV (E r c.m. =259 keV) proton capture resonant state of 15 O at 7556 keV. The strength of the resonance (ωγ) has been determined from the experimental data. The level lifetime of the sub-threshold resonant state at Ex=6792 keV, as well as the lifetimes of the 5181 keV and 6172 keV states, have been measured using the Doppler shift attenuation method (DSAM). The structural properties of the nucleus 15 O, such as, the level energies, transition strengths, level lifetimes, and spectroscopic factors, have been calculated theoretically by using the large basis shell model, which agrees reasonably well with the present as well as the previous experimental data.

Characterization study of NaI(Tl) γ-summing spectrometer

“…The author has studied the resonance reaction of 14 N(p,𝛾) 15 O at 𝐸 𝑙𝑎𝑏 = 278 keV. This reaction has several consequences in nuclear astrophysics -from neutrino production in our Sun, to age estimates of globular clusters in our Galaxy [33]. The cross-section for the reaction drops to nanobarn to picobarn range when we move from the resonance energy.…”