Energy levels of light nuclei A = 16–17

doi:10.1016/0375-9474(77)90415-8

Nuclear Physics A

Volume 281, Issue 1, 25 April 1977, Pages 1-148

https://doi.org/10.1016/0375-9474(77)90415-8 Get rights and content

Abstract

Compilation of energy levels of A = 16 and 17 nuclei, with emphasis on material leading to information about the structure of the A = 16 and 17 systems.

References (7)

F. Ajzenberg-Selove et al.
Nucl. Phys.
(1974)
F. Ajzenberg-Selove
Nucl. Phys.
(1975)
F. Ajzenberg-Selove
Nucl. Phys.
(1976)

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Cited by (197)

Erratum to “Investigation of spatial manifestation of α clusters in 16O via α-transfer reactions” (Nuclear Physics, Section A (2019) 983 (38–52), (S037594741830513X), (10.1016/j.nuclphysa.2018.12.024))
2019, Nuclear Physics A
Investigation of spatial manifestation of α clusters in 16O via α-transfer reactions
2019, Nuclear Physics A
Recently, we have determined surface distributions of α clusters in the ground state of ${}^{20}{Ne}$ from α-transfer cross sections, without investigating the properties of its excited states. In this paper we extend our comprehension of α-cluster structures in excited states of nuclei through reaction studies. In particular we focus on ${}^{16}O$ , for which attention has been paid to advances of structure theory and assignment regarding $4^{+}$ -resonance states. We study the surface manifestation of the α-cluster states in both the ground and excited states of ${}^{16}O$ from the analysis of the α-transfer reaction ${}^{12}C {({}^{6}{Li}, d)}^{16} O$ . The α-transfer reaction is described by the distorted-wave Born approximation. We test two microscopic wave functions as an input of reaction calculations. Then a phenomenological potential model is introduced to clarify the correspondence between cluster-wave functions and transfer-cross sections. Surface peaks of the α-wave function of ${}^{16}O (0^{+})$ are sensitively probed by transfer-cross sections at forward angles, while it remains unclear how we trace the surface behavior of ${}^{16}O (4^{+})$ from the cross sections. From inspection of the cross sections at forward angles, we are able to specify that the α-cluster structure in the $0_{1}^{+}$ and $0_{2}^{+}$ states prominently manifests itself at the radii ∼4 and ∼4.5 fm, respectively. It is remarkable that the $4_{1}^{+}$ state has the ${}^{12}C + α$ -cluster component with the surface peak at the radius ∼4 or outer, whereas the ${}^{12}C + α$ -cluster component in the $4_{2}^{+}$ state is found not to be dominant. The $4_{2}^{+}$ state is difficult to be interpreted by a simple potential model assuming the ${}^{12}C + α$ configuration only.
Measurement of gamma-ray production cross sections for nuclear reactions 14N(d,pγ)15N and 28Si(d,pγ) 29Si
2014, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Citation Excerpt :
Thus our values can be considered as new contribution concerning the 14N(d,p)15N reactions. The fluctuations in the case of p4, p5 and p6 groups support the statement of Ajzenberg-Selove [36] about the resonant structure. Our (d,pγ) results, especially the excitation function of the 4-1 gamma transition, also shows the resonant structure around 1.4 MeV deuteron energy.
In this work the differential cross sections for gamma-ray emission from the ¹⁴N(d,pγ)¹⁵N (Eγ = 1885, 2297, 7299 and 8310 keV) and from the ²⁸Si(d,pγ)²⁹Si (Eγ = 1273, 2028, 2426 and 4934 keV) were measured simultaneously with the ¹⁴N(d,p_4,5,6,7)¹⁵N differential cross sections and ¹⁴N(d,d)¹⁴N elastic scattering cross section using a HPGe detector at 55° and an ion implanted Si detector at 135° with respect to the beam direction in the deuteron energy range 0.65–2.0 MeV. The target was a thin silicon-nitride film. Gamma-ray angular distribution measurements were performed to determine the possible anisotropy of the gamma-ray emission, and the measured cross section values were converted into total gamma-ray producing cross sections for most of the gamma-ray emissions. The average uncertainties of nitrogen and silicon gamma-ray production cross sections are 5% and 12%, respectively and 8% concerning the particle production cross section of ^natN(d,d₀)^natN and ¹⁴N(d,p_4,5,6,7)¹⁵N reactions.
α-particle condensate states in 16O
2010, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
The existence of a rotational band with the $α + {}^{12}C (0_{2}^{+})$ cluster structure, in which three α particles in ¹²C( $0_{2}^{+}$ ) are locally condensed, is demonstrated near the four-α threshold of ¹⁶O in agreement with experiment. This is achieved by studying structure and scattering for the $α + {}^{12}C (0_{2}^{+})$ system in a unified way. A drastic reduction (quenching) of the moment of the inertia of the $0^{+}$ state at 15.1 MeV just above the four-α threshold in ¹⁶O suggests that it could be a candidate for the superfluid state in α-particle condensation.
Energy levels of light nuclei A = 8,9,10
2004, Nuclear Physics A
Microscopic calculations of C2 and C4 form factors in sd-shell nuclei
2003, Nuclear Physics A
Inelastic electron scattering to 2⁺ and 4⁺ states for the even–even N=Z sd-shell nuclei ( $^{20}$ Ne, $^{24}$ Mg, $^{28}$ Si and $^{32}$ S) are discussed taking into account higher energy configurations outside the sd-shell. Higher energy configurations, which are called core polarization effects, are included through a microscopic theory that includes excitations from the core 1s and 1p orbits and also from 2s–1d shell to the higher allowed orbits with 2ℏω excitations. The predictions of C2 and C4 Coulomb form factors are compared with the available experimental data. The calculations based on the Wildenthal interaction for the sd-shell model space and on the modified surface delta interaction for the core-polarization effects. The effect of higher excited configurations is found essential in both the transition strength and momentum transfer dependence of form factors, and gives a remarkably good agreement with the measured data.

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^☆: This work has been supported by the US Energy Research and Development Administration [EY-76-S-02-2785.∗000].

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Nuclear Physics A

Abstract

References (7)

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Cited by (197)

Erratum to “Investigation of spatial manifestation of α clusters in <sup>16</sup>O via α-transfer reactions” (Nuclear Physics, Section A (2019) 983 (38–52), (S037594741830513X), (10.1016/j.nuclphysa.2018.12.024))

Investigation of spatial manifestation of α clusters in <sup>16</sup>O via α-transfer reactions

Measurement of gamma-ray production cross sections for nuclear reactions <sup>14</sup>N(d,pγ)<sup>15</sup>N and <sup>28</sup>Si(d,pγ) <sup>29</sup>Si

α-particle condensate states in <sup>16</sup>O

Energy levels of light nuclei A = 8,9,10

Microscopic calculations of C2 and C4 form factors in sd-shell nuclei

Energy levels of light nuclei A = 16–17☆

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.