EXPERIMENTAL STUDY OF THE FIRST EXCITED STATE OF $sup 9$Be. (in French)
Journal Article
·
· Nucl. Phys. A169: No. 3, 521-39 (1971).
OSTI ID:4713582
- Research Organization:
- CRN-CNRS, Strasbourg
- NSA Number:
- NSA-25-045939
- OSTI ID:
- 4713582
- Journal Information:
- Nucl. Phys. A169: No. 3, 521-39 (1971)., Other Information: Orig. Receipt Date: 31-DEC-71
- Country of Publication:
- Country unknown/Code not available
- Language:
- French
Similar Records
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.
EXPERIMENTAL STUDIES OF THE ELECTROMAGNETIC TRANSITIONS FROM THE FIRST EXCITED STATES IN Hf$sup 177$, Lu$sup 175$ AND Lu$sup 17$$sup 7$
THE MECHANISM OF THE REACTION Be$sup 9$(Li$sup 6$,2$alpha$)Li$sup 7$ (FIRST EXCITED STATE)
Journal Article
·
Tue Jan 01 00:00:00 EST 2019
· Physics Letters B
·
OSTI ID:4713582
+10 more
EXPERIMENTAL STUDIES OF THE ELECTROMAGNETIC TRANSITIONS FROM THE FIRST EXCITED STATES IN Hf$sup 177$, Lu$sup 175$ AND Lu$sup 17$$sup 7$
Journal Article
·
Tue Jan 01 00:00:00 EST 1963
· Arkiv Fysik
·
OSTI ID:4713582
THE MECHANISM OF THE REACTION Be$sup 9$(Li$sup 6$,2$alpha$)Li$sup 7$ (FIRST EXCITED STATE)
Journal Article
·
Sun Oct 01 00:00:00 EDT 1961
· Journal de Physique et le Radium (France) Changed to J. Phys. (Orsay, Fr.)
·
OSTI ID:4713582
Related Subjects
N36330* -Physics (Nuclear)-Nuclear Properties & Reactions
6 <= A <= 19-Energy Levels & Transitions
N36355 -Physics (Nuclear)-Nuclear Properties & Reactions
6 <= A <= 19-Nuclear Reactions & Scattering-Deuterons & Tritons
N36356 -Physics (Nuclear)-Nuclear Properties & Reactions
6 <= A <= 19-Nuclear Reactions & Scattering-Helium-3 & Helium-4
ALPHA BEAMS- ALPHA PARTICLES- ALPHA SPECTRA- INELASTIC SCATTERING- MEV RANGE 01-10
ALPHA PARTICLES- ALPHA SPECTRA- BORON 10- ELASTIC SCATTERING- MEV RANGE 01-10- - NUCLEAR REACTIONS- SPECTRA- TRITON BEAMS- TRITONS
BERYLLIUM 9 ENERGY LEVELS- LEVEL WIDTHS- PARITY- SPIN
TRITONS/scattering by boron-10 at 1 to 3.2 MeV
triton spectra from elastic
(E)
BORON ISOTOPES B-10/triton elastic scattering at 1 to 3.2 MeV
triton spectra from
(E)
BERYLLIUM ISOTOPES Be-9/energy level from boron-10 (t
$alpha$) reactions and $alpha$ inelastic scattering
spin-parity assignment and width for first-excited
(E)
ALPHA PARTICLES/scattering by beryllium-9 at 5 to 12.5 MeV
$alpha$ spectra from
(E)
TRITONS/reactions (t
$alpha$) with boron-10 at 1 to 3.2 MeV
$alpha$ spectra from
(E)
BERYLLIUM ISOTOPES Be-9/alpha inelastic scattering at 5 to 12.5 MeV
$alpha$ spectra from
(E)
BORON ISOTOPES B-10/triton reactions (t
$alpha$) at 1 to 3.2 MeV
$alpha$ spectra from
6 <= A <= 19-Energy Levels & Transitions
N36355 -Physics (Nuclear)-Nuclear Properties & Reactions
6 <= A <= 19-Nuclear Reactions & Scattering-Deuterons & Tritons
N36356 -Physics (Nuclear)-Nuclear Properties & Reactions
6 <= A <= 19-Nuclear Reactions & Scattering-Helium-3 & Helium-4
ALPHA BEAMS- ALPHA PARTICLES- ALPHA SPECTRA- INELASTIC SCATTERING- MEV RANGE 01-10
ALPHA PARTICLES- ALPHA SPECTRA- BORON 10- ELASTIC SCATTERING- MEV RANGE 01-10- - NUCLEAR REACTIONS- SPECTRA- TRITON BEAMS- TRITONS
BERYLLIUM 9 ENERGY LEVELS- LEVEL WIDTHS- PARITY- SPIN
TRITONS/scattering by boron-10 at 1 to 3.2 MeV
triton spectra from elastic
(E)
BORON ISOTOPES B-10/triton elastic scattering at 1 to 3.2 MeV
triton spectra from
(E)
BERYLLIUM ISOTOPES Be-9/energy level from boron-10 (t
$alpha$) reactions and $alpha$ inelastic scattering
spin-parity assignment and width for first-excited
(E)
ALPHA PARTICLES/scattering by beryllium-9 at 5 to 12.5 MeV
$alpha$ spectra from
(E)
TRITONS/reactions (t
$alpha$) with boron-10 at 1 to 3.2 MeV
$alpha$ spectra from
(E)
BERYLLIUM ISOTOPES Be-9/alpha inelastic scattering at 5 to 12.5 MeV
$alpha$ spectra from
(E)
BORON ISOTOPES B-10/triton reactions (t
$alpha$) at 1 to 3.2 MeV
$alpha$ spectra from