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Newson, H.W.; Williamson, R. M.; Jones, K. W.; Gibbons, John H.; Marshak, H.

doi:10.1103/physrev.108.1294

Cited by 92 publications

(20 citation statements)

References 13 publications

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“…The best fits are obtained by minimizing These results are essentially the same as those found by Newson et al (1957) from fitting (J'pn/k and (J'pp' values only. Since E1 is small we refer to the Z-state as the threshold state, or the 18'9 MeV state of 8 Be.…”

Section: One-level R Matrix Fit To Datasupporting

confidence: 62%

“…There is appreciable (10%) isospin mixing in the 18·9 MeV T level of 8Be, and its FWHM as observed in different reactions is expected to vary from about 20 to 200 keV, for good energy resolution. It may be noted that such values of the FWHM are consistent with a partial proton width rp = 2Pp yip of about 0·4 MeV, so that there is no inherent contradiction in the width values quoted by Newson et al (1957) and by Arnold et al (1974).…”

Section: Discussionsupporting

confidence: 52%

“…The significance of terms of O(k2) may be seen by comparing the analysis of Newson et al (1957) with the scattering length approximation. The cross section used by Newson et al O(k) or 0(1)() (unless hi = 0); therefore their inclusion in 0 2 -of terms of higher order in I)( is unjustified.…”

Section: Comments On Use Of Scattering Length Approximationmentioning

confidence: 99%

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2- States of 8Be

Barker¹

1977

Aust. J. Phys.

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The cross sections for several reactions populating sBe in the region of the 7Be+n threshold show rapid changes, which have been attributed to a 2-threshold state. An analysis of these data using R matrix theory shows that there is considerable isospin mixing in the threshold state, implying another 2 -state nearby. A two-level R matrix approximation provides a good fit to all the relevant data, with parameters consistent with shell model calculations and with properties of sLi. Proper account must be taken of the neutron threshold in order to explain the isospin mixing. The threshold state is expected to show different widths in different reactions.

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Section: One-level R Matrix Fit To Datasupporting

confidence: 62%

Section: Discussionsupporting

confidence: 52%

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2- States of 8Be

Barker¹

1977

Aust. J. Phys.

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“…As suggested in Ref. [25], the shape of the cross section near threshold can be reproduced by the Breit-Wigner single-resonance formula reduced to…”

Section: Resultsmentioning

confidence: 77%

“…There are three available measurements of the reaction cross section near threshold [18,25,26] 7 Li(p,n) 7 Be reaction cross section derived from the energy spectrum (close square with error bars) normalized to Macklin and Gibbons [18] and to Newson et al [25] scaled to Macklin and Gibbons. Sekharan et al [26] data are also plotted.…”

Section: Resultsmentioning

confidence: 99%

Excitation function shape and neutron spectrum of theLi7(p,n)Be7reaction near threshold

et al. 2016

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The forward-emitted low energy tail of the neutron spectrum generated by the 7 Li(p,n) 7 Be reaction on a thick target at a proton energy of 1893.6 keV was measured by time-of-flight spectroscopy. The measurement was performed at BELINA (Beam Line for Nuclear Astrophysics) of the Laboratori Nazionali di Legnaro. Using the reaction kinematics and the proton on lithium stopping power the shape of the excitation function is calculated from the measured neutron spectrum. Good agreement with two reported measurements was found. Our data, along with the previous measurements, are well reproduced by the Breit-Wigner single-resonance formula for s-wave particles. The differential yield of the reaction is calculated and the widely used neutron spectrum at a proton energy of 1912 keV was reproduced. Possible causes regarding part of the 6.5% discrepancy between the 197 Au(n,γ ) cross section measured at this energy by Ratynski and Kappeler [Phys. Rev. C 37, 595 (1988)] and the one obtained using the Evaluated Nuclear Data File version B-VII.1 are given.

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Thermally Stimulated Conductivity of Irradiated KBr

Taylor

1970

Physica Status Solidi (b)

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The thermally stimulated conductivity of KBr crystals irradiated a t 10 "K with monoenergetic neutrons and y-rays was studied over the temperature range 10 to 300 OK. The peak spectrum below 70 OK was associated with the annihilation of lattice defects created by the irradiation, while the higher temperature peaks were interpreted as due to the depopulation of impurity traps. The annealing kinetics of the low-temperature peak were consistent with defect annihilation processes controlled by the migration of the Br-interstitials. Neutron bombardment enhanced significantly the low-temperature peaks above the level established by background y-rags.Die thermisch stimulierte Leitfiihigkeit von KBr-Kristallen, die bei 10 " K mit monoenergetischen Neutronen und y-Strahlen bestrahlt wurden, wurde im Temperaturbereich von 10 bis 300 " K untersucht. Die Maxima im Spektrum unterhalb 70 O K wurden mit der Annihilation von Gitterdefekten, die durch Bestrahlung hervorgerufen wurden. verknupft, wihrend die Maxima bei hoheren Temperaturen der Entleerung von Verunreinigungshaftstellen zugeordnet wurden. Die Ausheilkinetik der Maxima bei niedrigen Temperaturen ist mit einem VernichtungsprozeD der Defekte konsistent, der durch Wanderung der BrZwischengitterdefekte gesteuert wird. NeutronenbeschuLi hebt die Maxima bei niedrigen Temperaturen betrachtlich aus dem durch die y-Strahlen verursachten Untergrund heraus.

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Li7(p, n), (p, p

Cited by 92 publications

References 13 publications

2- States of 8Be

2- States of 8Be

Excitation function shape and neutron spectrum of theLi7(p,n)Be7reaction near threshold

Thermally Stimulated Conductivity of Irradiated KBr

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