Nuclear Data Sheets for A = 26

Basunia, M. S.; Hurst, A. M.

doi:10.1016/j.nds.2016.04.001

Cited by 72 publications

(131 citation statements)

References 321 publications

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“…As can be seen in Table I, we are in good agreement up to E x = 7.8 MeV with the values given in Ref. [15], where precise E x values with an accuracy better than 1 keV are provided. The derived E x values are also in good agreement up to 9 MeV with those listed in Ref.…”

Section: A Excitation Energysupporting

confidence: 90%

“…[15] (the first column of Table I). The E x values of higher excited states were determined with the help of kinematic calculations from their peak positions in the 0.5…”

Section: A Excitation Energymentioning

confidence: 99%

“…[5,13,14]) and thus, we can assume that these transitions have the same B(GT) values. Since absolute B(GT) values can be obtained from 26 Si β decay, we use the β-decay B(GT) values up to 2.74 MeV [15] for the derivation of the unit GT cross sectionσ GT . The B(GT) values for the transitions to higher excited states can be derived using the close proportionality given in Eq.…”

mentioning

confidence: 99%

“…States excited with L = 0 are indicated by their E x values, where the values up to 8 MeV are taken from Ref. [15]. The states excited with L 1 and discussed in the text are indicated by italic characters.…”

mentioning

confidence: 99%

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High-resolution study ofTz=+1→0Gamow-Teller transitions in theMg26(He

Win¹,

Fujita²,

Oo³

et al. 2017

Phys. Rev. C

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In order to study the T z = +1 → 0 Gamow-Teller (GT) transitions in the mass A = 26 system, a chargeexchange reaction 26 Mg( 3 He,t) 26 Al was performed at an incident energy of 140 MeV/nucleon and scattering angle at and near 0• , where T z is the z component of isospin T defined by (N − Z)/2. In this (p,n)-type reaction, it is expected that GT states with T = 0, 1, and 2 are excited. An energy resolution of E = 23 keV allowed us to study many discrete states. Most of the prominent states showed 0• -peaked angular distributions, which suggested that they are the states excited by L = 0 GT transitions. Candidates of GT states were studied up to an excitation energy E x = 18.5 MeV. The reduced GT transition strengths, B(GT), were derived assuming the proportionality between cross sections and B(GT) values. Standard B(GT) values were obtained form the 26 Si β decay, where the mirror symmetry of T z = ±1 → 0 GT transitions was assumed. The GT strength, as a whole, is divided in two energy regions: the region of up to 8.5 MeV and the higher-energy region of 8.5-12.8 MeV, where the strength in the latter region distributed like a resonance. The obtained GT strength distribution is compared with the results of random phase approximation calculations. The T = 2 GT states are expected in the region E x 13.5 MeV. By comparing with the results of (n,p)-type 26 Mg(d, 2 He) 26 Na and 26 Mg(t, 3 He) 26 Na reactions, the isospin symmetry of T = 2 GT states is discussed. Owing to the high-energy resolution, we could study the decay widths for the states in the E x > 9 MeV region. The T = 2 state at 13.592 MeV is not noticeably wider than the experimental energy resolution. The narrow width of the state is explained in terms of isospin selection rules.

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Section: A Excitation Energysupporting

confidence: 90%

“…[15] (the first column of Table I). The E x values of higher excited states were determined with the help of kinematic calculations from their peak positions in the 0.5…”

Section: A Excitation Energymentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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High-resolution study ofTz=+1→0Gamow-Teller transitions in theMg26(He

Win¹,

Fujita²,

Oo³

et al. 2017

Phys. Rev. C

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“…This effect was attributed to the large radial extension of certain orbits that probe the continuum [6]. Studies of the N = 17 odd-odd isotones toward the neutron drip line (from Z = 13 to Z = 9) have suggested, making use of a tentative assignment of the unbound J = 3 state in 26 F [3,7,8], a gradual reduction of the effective proton-neutron interaction with increasing neutron-to-proton asymmetry [9], rather than an abrupt change at the drip line.…”

Section: Introductionmentioning

confidence: 99%

Effective proton-neutron interaction near the drip line from unbound states in F25,26

Vandebrouck¹,

Lepailleur²,

Sorlin³

et al. 2017

Phys. Rev. C

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Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The 26 F nucleus, composed of a deeply bound π 0d 5/2 proton and an unbound ν0d 3/2 neutron on top of an 24 O core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a J π = 1 1 + − 4 1 + multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The J π = 1 1 + , 2 1 + , 4 1 + bound states have been determined, and only a clear identification of the J π = 3 1 + is missing. Purpose: We wish to complete the study of the J π = 1 1 + − 4 1 + multiplet in 26 F, by studying the energy and width of the J π = 3 1 + unbound state. The method was first validated by the study of unbound states in 25 F, for which resonances were already observed in a previous experiment. Method: Radioactive beams of 26 Ne and 27 Ne, produced at about 440A MeV by the fragment separator at the GSI facility were used to populate unbound states in 25 F and 26 F via one-proton knockout reactions on a CH 2 target, located at the object focal point of the R 3 B/LAND setup. The detection of emitted γ rays and neutrons, added to the reconstruction of the momentum vector of the A − 1 nuclei, allowed the determination of the energy of three unbound states in 25 F and two in 26 F. Results: Based on its width and decay properties, the first unbound state in 25 F, at the relative energy of 49(9) keV, is proposed to be a J π = 1/2 − arising from a p 1/2 proton-hole state. In 26 F, the first resonance at 323(33) keV is proposed to be the J π = 3 1 + member of the J π = 1 1 + − 4 1 + multiplet. Energies of observed states in 25,26 F have been compared to calculations using the independent-particle shell model, a phenomenological shell model, and the ab initio valence-space in-medium similarity renormalization group method. Conclusions: The deduced effective proton-neutron interaction is weakened by about 30-40% in comparison to the models, pointing to the need for implementing the role of the continuum in theoretical descriptions or to a wrong determination of the atomic mass of 26 F.

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Radioactive heat production of six geologically important nuclides

Ruedas

2017

Geochem Geophys Geosyst

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Heat production rates for the geologically important nuclides 26Al, 40K, 60Fe, 232Th, 235U, and 238U are calculated on the basis of recent data on atomic and nuclear properties. The revised data differ by several percent from some older values but indicate that more recent analyses converge toward values with an accuracy sufficient for all common geoscience applications, although some possibilities for improvement still remain, especially in the case of 40K and with regard to the determination of half‐lives. A Python script is provided for calculating heat production (https://github.com/trg818/radheat).

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Nuclear Data Sheets for A = 26

Cited by 72 publications

References 321 publications

High-resolution study ofTz=+1→0Gamow-Teller transitions in theMg26(He

High-resolution study ofTz=+1→0Gamow-Teller transitions in theMg26(He

Effective proton-neutron interaction near the drip line from unbound states in F25,26

Radioactive heat production of six geologically important nuclides

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