Energy systematics of the lg/sub 9/2/ neutron hole state and isospin dependence of the nuclear potential
Journal Article
·
· Nucl. Phys., A, v. 246, no. 1, pp. 21-28
OSTI ID:4197205
- Research Organization:
- Tohoku Univ., Sendai (Japan). Dept. of Physics); (Aoyama Gakuin Univ., Tokyo (Japan). Coll. of Science and Engineering); (Faculty of Medicine, Ju
- NSA Number:
- NSA-32-029791
- OSTI ID:
- 4197205
- Journal Information:
- Nucl. Phys., A, v. 246, no. 1, pp. 21-28, Other Information: Orig. Receipt Date: 31-DEC-75; Bib. Info. Source: NL (Netherlands (sent to DOE from))
- Country of Publication:
- Netherlands
- Language:
- English
Similar Records
Systematics of energies of particle-hole states in the 2s-1d and 1f/sub 7/2/ shells
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.
Systematics of isospin character of transitions to the 2[sub 1][sup +] and 3[sub 1][sup [minus]] states in [sup 90,92,94,96]Zr
Journal Article
·
Mon Oct 28 00:00:00 EST 1974
· Phys. Lett., B, v. 52, no. 4, pp. 401-406
·
OSTI ID:4197205
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.
Journal Article
·
Tue Jan 01 00:00:00 EST 2019
· Physics Letters B
·
OSTI ID:4197205
+10 more
Systematics of isospin character of transitions to the 2[sub 1][sup +] and 3[sub 1][sup [minus]] states in [sup 90,92,94,96]Zr
Journal Article
·
Mon Feb 01 00:00:00 EST 1993
· Physical Review, C (Nuclear Physics); (United States)
·
OSTI ID:4197205
+7 more
Related Subjects
N68751* -Physics (Nuclear
Experimental)-Nuclear Properties & Reactions
90 <= A <= 149-Nuclear Reactions & Scattering
642805*
*PROTON REACTIONS- PICKUP REACTIONS
ANTIMONY 120- ANTIMONY 121
ANTIMONY 120- ANTIMONY 123
BINDING ENERGY
CADMIUM 109- CADMIUM 110
CADMIUM 112- CADMIUM 113
CADMIUM 113- CADMIUM 114
CADMIUM 115- CADMIUM 116
DEUTERONS
ENERGY LEVELS
ISOSPIN
LEAST SQUARE FIT
MEV RANGE 10-100
ONE-NUCLEON TRANSFER REACTIONS
SCHROEDINGER EQUATION
SPECTRA
SPHERICAL CONFIGURATION
TELLURIUM 127- TELLURIUM 128
WOODS-SAXON POTENTIAL MOLYBDENUM 95- MOLYBDENUM 96
Experimental)-Nuclear Properties & Reactions
90 <= A <= 149-Nuclear Reactions & Scattering
642805*
*PROTON REACTIONS- PICKUP REACTIONS
ANTIMONY 120- ANTIMONY 121
ANTIMONY 120- ANTIMONY 123
BINDING ENERGY
CADMIUM 109- CADMIUM 110
CADMIUM 112- CADMIUM 113
CADMIUM 113- CADMIUM 114
CADMIUM 115- CADMIUM 116
DEUTERONS
ENERGY LEVELS
ISOSPIN
LEAST SQUARE FIT
MEV RANGE 10-100
ONE-NUCLEON TRANSFER REACTIONS
SCHROEDINGER EQUATION
SPECTRA
SPHERICAL CONFIGURATION
TELLURIUM 127- TELLURIUM 128
WOODS-SAXON POTENTIAL MOLYBDENUM 95- MOLYBDENUM 96