Abstract
The reaction network in the neutron-deficient part of the nuclear chart around A ≈ 100 contains several nuclei of importance to astrophysical processes, such as the p–process. This work reports on the results from recent experimental studies of the radiative proton–capture reactions 112,114Cd(p, γ)113,115 In. Experimental cross sections for the reactions have been measured for proton beam energies residing inside the respective Gamow windows for each reaction, using isotopically enriched 112Cd and 114Cd targets. Two different techniques, the in–beam γ–ray spectroscopy and the activation method have been implemented, where the latter is considered mandatory to account for the presence of low–lying isomers in 113In (E ≈ 392 keV, t1/2 ≈ 100 min), and 115In (E ≈ 336 keV, t1/2 ≈ 4.5 h). Following the measurement of the cross sections, the astrophysical S factors have been subsequently
Highlights
The origin of a group of 35 neutron–deficient nuclides, spanning from 74Se to 196Hg, commonly referred to as p nuclei, has been a long–standing puzzle in nuclear astrophysics
Such is the aim of this work, which reports on cross section measurements of the radiative proton–capture reactions with 112,114Cd, for energies inside the astrophysical important Gamow window [1] (1.6–4.8 MeV for both reactions [3])
Enriched (99.7%) 112Cd and 114Cd targets were used for the study of the radiative proton–capture reactions 112,114Cd(p, γ)113,115In, using two different techniques, namely, in–beam γ–spectroscopy and the activation method [3, 8, 9], where the latter was deemed necessary to account for the presence of low–lying isomers in 113,115In [6]
Summary
The origin of a group of 35 neutron–deficient nuclides, spanning from 74Se to 196Hg, commonly referred to as p nuclei, has been a long–standing puzzle in nuclear astrophysics. Experimental input is critical in the attempt to constrain the model parameters, and better understand the driving mechanisms behind the p–process Such is the aim of this work, which reports on cross section measurements of the radiative proton–capture reactions with 112,114Cd, for energies inside the astrophysical important Gamow window [1] (1.6–4.8 MeV for both reactions [3]). These reactions lead to the production of 113In, nowadays widely accepted not to be a “pure” p nucleus, having non–negligible s– and r–process components [4], and the slightly heavier 115In, a nucleus studied for its medical applications [5]
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