Resonant photoexcitation of isomers. 115Inm as a test case

The115In(γ, γ′) reaction as a test of the quasi-particle phonon model with complex configurations in odd-mass nuclei

“…3 Literature [18] QPM (1-phonon) Thus, the QPM leads to a somewhat different interpretation compared to the UM [7] calculations described in [6]. There, the B (M1) strength came solely from spinflip transitions and no significant B(E2) strength appeared (which, however, might be due to a systematic shortcoming of the UM, see [6]).…”

“…3 Literature [18] QPM (1-phonon) Thus, the QPM leads to a somewhat different interpretation compared to the UM [7] calculations described in [6]. There, the B (M1) strength came solely from spinflip transitions and no significant B(E2) strength appeared (which, however, might be due to a systematic shortcoming of the UM, see [6]). At low excitation energies the QPM results show a dominance of In the investigated energy range, ~,B(M1)~0.8p 2 according to the QPM results with the strength mainly concentrated in three transitions at Ex= 1.99, 2.25 and 3.21 MeV which have B(M1)=0.13, 0.45 and 0.11/~ 2, respectively.…”

“…The present work on a15In was motivated by systematic studies of the photoexcitation of spin isomers [4,5] which typically show a few intermediate states with large cross sections. It was demonstrated in [6] for the example of llSIn that the combination of nuclear resonance fluorescence data with photoactivation results yields important insight into the structure of the intermediate levels.…”

Laser-Driven Radiation Therapy

“…Since hitherto no γ beams with sufficiently small bandwidth were available to exploit resonant excitation, there are obviously no such measured cross-sections. Presently, we can only estimate a lower bound using the averaged cross-sections measured at bremsstrahlung facilities a;b);data (2010);Neumann (1991). For cases where no measured cross-sections are available, we interpolate experimental cross-sections of the same reaction…”

“…One may expect that this energy dependence would become even more pronounced if the reactions were excited with a primary beam of smaller bandwidth that populates more selectively states which decay mainly to the isomeric level of interest. Also photoexcitation (γ, γ ′ ) experiments with bremsstrahlung beams were performed on a series of stable targets and showed strong population of isomeric levels b);Neumann (1991). The observed energy dependence of the isomer activation yields indicates that few gateway states are responsible for efficiently populating the isomers.…”