TITLE

# New data on (Î³, n), (Î³, 2n), and (Î³, 3n) partial photoneutron reactions

AUTHOR(S)
Varlamov, V. V.; Ishkhanov, B. S.; Orlin, V. N.; Peskov, N. N.; Stepanov, M. E.
PUB. DATE
November 2013
SOURCE
Physics of Atomic Nuclei;Nov2013, Vol. 76 Issue 11, p1403
SOURCE TYPE
DOC. TYPE
Article
ABSTRACT
Systematic discrepancies between the results of various experiments devoted to determining cross sections for total and partial photoneutron reactions are analyzed by using objective criteria of reliability of data in terms of the transitional photoneutron-multiplicity function Fi = Ïƒ( Î³, in)/ Ïƒ( Î³, xn), whose values for i = 1, 2, 3, ... cannot exceed by definition 1.00, 0.50, 0.33, ..., respectively. It was found that the majority of experimental data on the cross sections obtained for ( Î³, n), ( Î³, 2 n), and ( Î³, 3 n) reactions with the aid of methods of photoneutron multiplicity sorting do not meet objective criteria (in particular, F2 > 0.50 for a vast body of data). New data on the cross sections for partial reactions on 181Ta and 208Pb nuclei were obtained within a new experimental-theoretical method that was proposed for the evaluation of cross sections for partial reactions and in which the experimental neutron yield cross section Ïƒexpt( Î³, xn) = Ïƒ( Î³, n) + 2 Ïƒ( Î³, 2 n) + 3 Ïƒ( Î³, 3 n) + ..., which is free from problems associated with determining neutron multiplicities, is used simultaneously with the functions Fitheor calculated within a combined model of photonuclear reactions.
ACCESSION #
91955600

## Related Articles

• Experimental determination of L X-ray fluorescence cross sections for elements with 45 â‰¼ Z â‰¼ 50 at 10 keV. Bonzi, E. V.; Grad, G. B.; Barrea, R. A. // Papers in Physics;2014, Vol. 6, p1

Synchrotron radiation at 10 keV was used to experimentally determine the Ll, LÉ‘, LÎ²I, LÎ²II, LÉ£I and LÉ£II fluorescence cross sections for elements with 45 â‰¼ Z â‰¼ 50, as part of an ongoing investigation at low energies. The measured data were compared with calculated...

• Discrepancy of Cross Sections in pd Breakup Reactions at E = 250 MeV. Kuroita, S.; Sagara, K.; Eguchi, Y.; Yashima, K.; Shishido, T.; Yabe, T.; Dozono, M.; Yamada, Y.; Wakasa, T.; Noro, T.; Matsubara, H.; Zenihiro, J.; Tamii, A.; Okamura, H.; Hatanaka, K.; Saito, T.; Maeda, Y.; Kamada, H.; Tameshige, Y. // Few-Body Systems;May2011, Vol. 50 Issue 1-4, p287

In our previous inclusive experiment on H( p, p) pn at 247 MeV, the measured cross section at forward angles is about twice larger than 3 N calculation with Ï€Ï€ 3NF. Therefore, we have made an exclusive experiment on H( p, p p) n at the same energy. The preliminary data suggest that the...

• Experimental Study of Space Star Anomaly in pd Breakup Around 10 MeV/A. Yabe, T.; Sagara, K.; Kuroita, S.; Ishibashi, K.; Tamura, T.; Eguchi, Y.; Yashima, K.; Sueta, T.; Shimoda, H.; Maeda, Y. // Few-Body Systems;May2011, Vol. 50 Issue 1-4, p291

Cross section of pd breakup at Star configuration (equilateral triangle) was systematically measured at E = 9.5 and 13 MeV/A with varying an angle Î± between the Star plane and the beam axis. At 13 MeV/A, Star anomaly appears only around Space Star ( Î± = 90Â°) configuration. At 9.5 MeV/A,...

• A Rosetta Stone relating conventions in photo-meson partial wave analyses. Sandorfi, A. M.; Dey, B.; Sarantsev, A.; Tiator, L.; Workman, R. // AIP Conference Proceedings;4/16/2012, Vol. 1432 Issue 1, p219

A new generation of complete experiments in pseudoscalar meson photo-production is being pursued at several laboratories. While new data are emerging, there is some confusion regarding definitions of asymmetries and the conventions used in partial wave analyses (PWA). We present expressions for...

• Amplitudes and observables in pp elastic scattering at $\sqrt{s}=7\ \mbox{TeV}$. Kohara, A.; Ferreira, E.; Kodama, T. // European Physical Journal C -- Particles & Fields;Feb2013, Vol. 73 Issue 2, p1

A precise analysis of the pp elastic scattering data at 7 TeV in terms of its amplitudes is performed as an extension of previous studies for lower energies. Slopes B and B of the real and imaginary amplitudes are independent quantities, and a proper expression for the Coulomb phase is used. The...

• Recent Developments in Neutrino/Antineutrino-Nucleus Interactions. Morfín, Jorge G.; Nieves, Juan; Sobczyk, Jan T. // Advances in High Energy Physics;2012, p1

Recent experimental results and developments in the theoretical treatment of neutrino-nucleus interactions in the energy range of 1-10 GeV are discussed. Difficulties in extracting neutrinonucleon cross sections from neutrino-nucleus scattering data are explained and significance of...

• Review of Activities using the Pulsed Neutron Facility and 2.5-GeV Electron Linac at Pohang Accelerator Laboratory. Kim, Guinyun; Lee, Manwoo; Kim, Kyung Sook; Yang, Sungchul; Kim, Eunae; Shvetshov, Valery; Cho, Moo-Hyun; Naik, Haladhara // AIP Conference Proceedings;12/13/2011, Vol. 1412 Issue 1, p39

We report on activities using a pulsed neutron facility consisting of an electron linear accelerator, a water-cooled Ta target with a water moderator, and a 12 m time-of-flight path. It is possible to measure neutron total cross sections in the neutron energy range from 0.01 eV to a few hundred...

• Impact of Thorium Capture Cross Section Uncertainty on the Thorium Utilized ADS Reactivity Calculation. Thanh Mai Vu; Takanori Kitada // Science & Technology of Nuclear Installations;2014, p1

Recently, the researches on fast neutron spectrum system utilized thorium fuel are widely conducted. However, the recent thorium cross section libraries are limited compared to uranium cross section libraries. The impact of thorium cross section uncertainty on thorium fuel utilized accelerator...

• Evidence for Narrow N*(1685) resonance. Kuznetsov, Viacheslav; Polyakov, Maxim V. // AIP Conference Proceedings;10/21/2011, Vol. 1388 Issue 1, p284

Review of experimental observations which indicate the existence of a new narrow N*(1685) resonance is presented.

Share