γ-ray decay from neutron-bound and unbound states in 95Mo and a novel technique for spin determination
Journal Article
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· Physical Review C
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- iThemba LABS, Somerset West (South Africa)
- Charles Univ., Prague (Czech Republic)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
- Univ. of Richmond, Richmond, VA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Univ. of California, Berkeley, CA (United States)
- Univ. of Oslo, Oslo (Norway)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Wisconsin-La Crosse, La Crosse, WI (United States)
- Florida State Univ., Tallahassee, FL (United States)
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC05-00OR22725; AC52-07NA27344; AC02-05CH11231
- OSTI ID:
- 1266017
- Alternate ID(s):
- OSTI ID: 1236537; OSTI ID: 1379229; OSTI ID: 1474373
- Report Number(s):
- LLNL-JRNL-678755; KB0401022; ERKBP06
- Journal Information:
- Physical Review C, Vol. 93, Issue 2; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Cited by: 5 works
Citation information provided by
Web of Science
Web of Science
Low-energy enhancement and fluctuations of γ -ray strength functions in 56,57 Fe: test of the Brink–Axel hypothesis
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journal | April 2017 |
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Most theoretical approaches used in nuclear astrophysics to model the nucleosynthesis of heavy elements incorporate the so-called statistical model in order to describe the excitation and decay properties of atomic nuclei. One of the basic assumptions of this model is the validity of the Brink–Axel hypothesis and the related concept of so-called photon strength functions to describe γ-ray transition probabilities. We present a novel experimental approach that allows for the first time to experimentally determine the photon strength function simultaneously in two independent ways by a unique combination of quasi-monochromatic photon beams and a newly implemented γ–γ coincidence setup. This technique does not assume a priori the validity of the Brink–Axel hypothesis and sets a benchmark in terms of the detection sensitivity for measuring decay properties of photo-excited states below the neutron separation energy. The data for the spherical off-shell nucleus 128Te were obtained for γ-ray beam-energy settings between 3 MeV and 9 MeV in steps of 130 keV for the lower beam energies and in steps of up to 280 keV for the highest beam settings. We present a quantitative analysis on the consistency of the derived photon strength function with the Brink–Axel hypothesis. The data clearly demonstrate a discrepancy of up to a factor of two between the photon strength functions extracted from the photoabsorption and photon emission process, respectively. In addition, we observe that the photon strength functions are not independent of the excitation energy, as usually assumed. Thus, we conclude, that the Brink–Axel hypothesis is not strictly fulfilled in the excitation-energy region below the neutron separation threshold (Sn = 8.78 MeV) for the studied case of 128Te.
Strong γ-ray emission from neutron unbound states populated in β-decay: Impact on (n,γ) cross-section estimates
Enhanced -Ray Emission from Neutron Unbound States Populated in Decay
Journal Article
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Tue Jan 01 00:00:00 EST 2019
· Physics Letters B
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OSTI ID:1266017
+10 more
Strong γ-ray emission from neutron unbound states populated in β-decay: Impact on (n,γ) cross-section estimates
Journal Article
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Wed Sep 13 00:00:00 EDT 2017
· EPJ Web of Conferences
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OSTI ID:1266017
+59 more
Enhanced -Ray Emission from Neutron Unbound States Populated in Decay
Journal Article
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Sat Aug 01 00:00:00 EDT 2015
· Physical Review Letters
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OSTI ID:1266017
+35 more