Mass and charge distributions in the very asymmetric thermal neutron induced fission of the odd-Z nucleus Am-242m

Date

1999-10-25

Author

Tsekhanovich, I
Denschlag, HO
Davi, M
Buyukmumcu, Z
Wostheinrich, M
Gonnenwein, F
Oberstedt, S
Faust, HR

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

149
views

0
downloads

Yields of light fission products (A = 68, 70-84, 87, 88, 94, 96, 98, 102 and 106-108), their kinetic energies and nuclear charge distributions (A = 71-84, 87 and 88) in the thermal neutron induced fission of the odd-Z nucleus Am-242m(Z = 95) were measured using the mass-separator Lohengrin at the Institute Laue-Langevin in Grenoble (France). The mass yield curve shows a fine structure at A = 70, probably due to shell and/or odd-even effects affecting also the nuclear charge distribution. The analysis of isotopic chain yields gives evidence for a very low excitation energy of the lightest fission fragments observed. A preferential formation of fragments with even Z is found for this odd-Z compound nucleus, Calculated values for the local odd-even effect are comparable with those for the neighbouring even-Z fissile nuclides and increase from 13% to 30% with increasing asymmetry of the mass split (A(L) = 84 to 68 and Z(L) = 35 to 28). The neutron odd-even effect shows a similar but less pronounced behaviour.

Subject Keywords

Nuclear fission, Am-242m(n(th), f), Fission yields, Nuclear charge distribution, Odd-even effects

URI

https://hdl.handle.net/11511/68486

Journal

NUCLEAR PHYSICS A

DOI

https://doi.org/10.1016/s0375-9474(99)00338-3

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Mass and charge distributions in the very asymmetric mass region of the neutron induced fission of Np-238 Tsekhanovich, I; Denschlag, HO; Davi, M; Buyukmumcu, Z; Gonnenwein, F; Oberstedt, S; Faust, HR (2001-06-04) The mass-separator Lohengrin was used to measure the yields of the light fission products with A = 74-85 and their nuclear charge and kinetic energy distributions from the odd-Z compound nucleus Np-239* formed by double capture of thermal neutrons. The mass yield distribution reveals an influence of the fragment shell with N = 50 affecting also the nuclear charge and kinetic energy distributions. An odd-even effect for protons is found in the very asymmetric mass division, increasing from 4% to 35% with inc...
Antineutrino charm production and pentaquark search in the chorus experiment Köse, Umut; Güler, Ali Murat; Department of Physics (2006) During the years between 1994 and 1997, the emulsion target of the CHORUS experiment was exposed to the wide band neutrino beam of the CERN SPS of 27 GeV average energy collecting about 106 neutrino interactions. A measurement of induced charm production and search for anticharmed pentaquark ( 0 c ) have been performed by using the presence of a 6% component in the beam. By requiring a positive muon charge as determined by the CHORUS muon spectrometer, 46 -induced charm events were observed with ...
Measurements of D-0 production and of decay branching fractions in neutrino-nucleon scattering Onengut, G; et. al. (Elsevier BV, 2005-05-05) During the years 1994-1997, the emulsion target of the CHORUS detector was exposed to the wide-band neutrino beam of the CERN SPS of 27 GeV average neutrino energy. In total about 100 000 charged-current neutrino interactions were located in the nuclear emulsion target and fully reconstructed. From this sample of events which was based on the data acquired by new automatic scanning systems, 1048 charged-current interactions with a Do in the final state were selected by a pattern recognition program and conf...
Electroluminescence from Er-doped Si-rich silicon nitride light emitting diodes Yerci, Selçuk; DAL NEGRO, Luca (2010-08-23) Electrical devices based on Erbium (Er) doping of silicon nitride have been fabricated by reactive cosputtering and intense, room temperature Er electroluminescence was observed in the visible (527, 550, and 660 nm) and near-infrared (980 and 1535 nm) spectral ranges at low injection voltages (< 5 V EL turn on). The electrical transport mechanism in these devices was investigated and the excitation cross section for the 1535 nm Er emission was measured under electrical pumping, resulting in a value (1.2x10(...
Nanohardness measurements of heavy ion irradiated coarse- and nanocrystalline-grained tungsten at room and high temperature El-Atwani, O.; Weaver, J. S.; Esquivel, E.; Efe, Mert; Chancey, M. R.; Wang, Y. Q.; Maloy, S. A.; Mara, N. (Elsevier BV, 2018-10-01) Heavy ion irradiation was performed on coarse and nanocrystalline-grained tungsten (CGW and NGW, respectively) at room temperature (RT) and 1050 K from 0.25 to 4 dpa to simulate radiation damage for fusion energy applications. TEM and nanohardness measurements of irradiated samples were made to quantify the radiation tolerance of these two candidate materials. In this case, TEM is used to quantify the defect morphology at low dpa values and determine the barrier strength coefficients of the different defect...

Citation Formats

I. Tsekhanovich et al., “Mass and charge distributions in the very asymmetric thermal neutron induced fission of the odd-Z nucleus Am-242m,” NUCLEAR PHYSICS A, pp. 217–239, 1999, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68486.