Measurement of the inelastic scattering cross section in the 1.8 to 3.7 MeV energy range with monoenergetic photon beams
- Duke Univ., Durham, NC (United States). Dept. of Physics; Triangle Universities Nuclear Lab., Durham, NC (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division
For the first time the excitation cross section of $$^{115}\mathrm{In}$$ to its first excited state at 336.24 keV has been measured with monoenergetic photon beams at 15 energies between 1.8 and 3.7 MeV. The measurements were performed at the High-Intensity Gamma-ray Source ($$\mathrm{HI}{\gamma}\mathrm{S}$$) facility with natural In targets and incident photon fluxes ranging from $$0.7\times{}{10}^{7}{\gamma}/({\mathrm{cm}}^{2}{s})$$ to $$3.2\times{}{10}^{7}{\gamma}/({\mathrm{cm}}^{2}{s})$$. The inelastic scattering cross section was obtained from the yield of the 336.24 keV deexcitation $${\gamma}$$ rays. The cross-section values varied between < 0.05 and 28.7 $${\mu}\mathrm{b}$$ at 1.8 and 3.7 MeV, respectively. Compared to standard photon inelastic scattering cross-section data in this energy range of medium-mass nuclei, these extremely small values are not completely unexpected, given the nature of the low-lying nuclear levels of $$^{115}\mathrm{In}$$. Model calculations, however, overestimate the measured cross-section data by approximately one order of magnitude. Using different choices for the $$E1 {\gamma}$$-ray strength function, the data can be well described. Finally, the data are important for improving our knowledge of the level scheme of $$^{115}\mathrm{In}$$, especially spin and parity assignments of already known states.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Duke Univ., Durham, NC (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- AC52-07NA27344; FG02-97ER41033
- OSTI ID:
- 1529175
- Alternate ID(s):
- OSTI ID: 1484685; OSTI ID: 1484826
- Report Number(s):
- LLNL-JRNL-759602; PRVCAN; 947977
- Journal Information:
- Physical Review C, Vol. 98, Issue 6; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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