Single-particle behaviour in fast neutron (n, 2n) reactions

Chatterjee, Sourav; Chatterjee, A.

doi:10.1016/0375-9474(69)90750-7

Cited by 33 publications

(9 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although we measured only cross section for excited iso- 6 We do not include in the Table 7 mer in 117 Sn, it is possible to evaluate the value of σ g cross section for this reaction because semi-empirical formulae predict total (n, 2n) cross sections (σ g = σ tot − σ m ). The predictions of σ tot for the 118 Sn(n, 2n) 117 Sn reaction are (except that of [54]) all between 1330 and 1630 mb [26,52,53,55,58,73,74]. The mean value of total cross section is centered around (1464 ± 104) mb excluding the result of Ref.…”

Section: Sn(n 2n) 117 Sn Reactionmentioning

confidence: 99%

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Běták¹,

Mikołajczak²,

Staniszewska³

et al. 2005

Radiochimica Acta

View full text Add to dashboard Cite

Activation cross sections / Ge detector / Neutron-induced reactions / γ -ray spectroscopy / Tin region / Neutron generatorSummary. We measured activation cross sections via γ -ray spectroscopy using high-purity germanium detectors for 16 reactions induced by (14.4 ± 0.2) MeV neutrons on isotopes of tin. The cross sections are: σ( 112 Sn(n, 2n) 111 Sn) = (1104 ± 43) mb, σ( 112 Sn(n, p) 112m In) = (33.6 ± 2.1) mb, σ( 112 Sn(n, p) 112g In) = (42.7 ± 3.1) mb, σ( 114 Sn(n, 2n) 113 Sn) = (1270 ± 115) mb, σ( 114 Sn(n, p) 114m2 In) = (20.5 ± 1.1) mb, σ( 115 Sn(n, p) 115m In) = (35.2 ± 2.6) mb, σ( 116 Sn(n, p) 116m2 In) = (11.1 ± 0.5) mb, σ( 117 Sn(n, n p) 116m2 In) = (1.35 ± 0.11) mb, σ( 117 Sn(n, p) 117m In) = (4.5 ± 0.4) mb, σ( 117 Sn(n, p) 117g In) = (12.8 ± 0.7) mb, σ( 117 Sn(n, n ) 117m Sn) = (246 ± 21) mb, σ( 118 Sn(n, 2n) 117m Sn) = (816 ± 70) mb, σ( 118 Sn(n, α) 115g Cd) = (1.26 ± 0.16) mb, σ( 120 Sn(n, α) 117m Cd) = (0.27 ± 0.04) mb, σ( 120 Sn(n, α) 117g Cd) = (0.29 ± 0.06) mb and σ( 124 Sn(n, 2n) 123m Sn) = (590 ± 26) mb.Two 112 Sn targets enriched to 62.5% and 84%, respectively, were used for these measurements in addition to the natural tin. The cross sections were compared with experimental data found in the literature, with published empirical formulae and with model calculations including also the pre-equilibrium contribution. For reactions which do not involve protons from below the closed Z = 50 shell, the agreement to the data is reasonable, it is somewhat weaker for the (n, p) reactions and still worse in the case of (n, α), where, however, the pre-equilibrium component is not described properly by the models included so far. The possibility of production of 111 Sn → 111 In generator system is considered.

show abstract

Section: Sn(n 2n) 117 Sn Reactionmentioning

confidence: 99%

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Běták¹,

Mikołajczak²,

Staniszewska³

et al. 2005

Radiochimica Acta

View full text Add to dashboard Cite

show abstract

“…and Bacilhs spp. (Archibald, 1976;Chatterjee, 1969;Coyette & Ghuysen, 1968; Givan e t al., 1982 ;Glaser e t al., 1966 ;Schleifer & Steber, 1974;Young, 1967). Exceptions are the reports of…”

Section: Introductionmentioning

confidence: 99%

“…and Bacilhs spp. (Archibald, 1976;Chatterjee, 1969; Coyette & Ghuysen, 1968; Givan e t al., 1982 ; Glaser e t al., 1966 ;Schleifer & Steber, 1974;Young, 1967 D-galactose and N-acetylglucosamine (Fiedler et al, 1984 ;Fiedler & Ruhland, 1987; Kamisango etal., 1983;Knox & Wicken, 1973 ; Ullmann & Cameron, 1969 Busse, 1990;Loessner, 1991). Propagating strains are given in parentheses.…”

mentioning

confidence: 99%

Bacteriophage receptors on Listeria monocytogenes cells are the N-acetylglucosamine and rhamnose substituents of teichoic acids or the peptidoglycan itself

1996

View full text Add to dashboard Cite

Different approaches were used to examine the function of teichoic acids (TA) as phage receptors among selected Listeria strains, and to identify and characterize specific receptor structures of host cells belonging to different serovars. This included successive removal of cell wall constituents, preparation and purification of TA, and GLC analysis of TA components. Adsorption of Listeria monocytogenes bacteriophages could be inhibited by polyvalent antisera, specific lectins and addition of purified TA. The results confirmed the necessity of TA in general and of rhamnose and glucosamine in particular for adsorption of Listeria phage Al18, which is a temperate Siphovirus (morphotype Bl), attacking predominantly serovars 1/2. Host binding of siphoviral phage A500 (predominantly lysing serovars 4b), was also dependent on cell wall TA. A phage-resistant L. monocytogenes strain was shown to lack glucosamine in its TA. These results support the view that TA substituents may play an important role not only in antigenicity of Listeria cells, but also in specificity of host recognition by two temperate Listeria phages. In contrast, the broad-host-range virulent phage A51 1 (Myovirus, morphotype A l ) uses the listerial peptidoglycan as primary receptor. This corresponds well with the observation that A511 is capable of lysing the majority of L. monocytogenes strains. , 1982;Keogh & Pettingill, 1983; Sijtsma etal., 1988; Valyasevi etal., 1994;Yokokura, 1971). In particular, cell wall teichoic acids (TA) have been found to be important for phage adsorption in Stapblococcas spp. and Bacilhs spp. (Archibald, 1976;Chatterjee, 1969; Coyette & Ghuysen, 1968; Givan e t al., 1982 ; Glaser e t al., 1966 ;Schleifer & Steber, 1974;Young, 1967 D-galactose and N-acetylglucosamine (Fiedler et al., 1984 ;Fiedler & Ruhland, 1987; Kamisango etal., 1983;Knox & Wicken, 1973 ; Ullmann & Cameron, 1969 Busse, 1990;Loessner, 1991). Propagating strains are given in parentheses. Propagation of phages was done according to Loessner & Busse (1990). For adsorption assays, host strains were grown overnight in tryptose broth (Merck) at 30 "C. Cells were washed with SM buffer (Sambrook e t al., l989), resuspended in equal volumes, and titrated. One millilitre volumes of suspensions were used for adsorption assays. KeywordsPreparation of listerial cell walls. Broth cultures (late exponential phase) were inactivated by steaming (100 OC, 10 min), followed by concentration and washing by ultrafiltration (Sartocon module, cellulose acetate, pore size 0.2 pm, Sartorius). Finally, cells were harvested by centrifugation (10 000 g , 15 min), resuspended in SM buffer, and mechanically disrupted by double passage through a French pressure cell (SLM Aminco) at 40000 p.s.i. (276 MPa). Cell walls were prepared by methods similar to those described by Fiedler et al. (1984) and Valyasevi e t al. (1990). Crude cell walls were sedimented by differential centrifugation (1 5 000 g , 30 min), resuspended in SM buffer, and treated with DNase/RNase (3 h) and proteina...

show abstract

“…The aluminium monitor foil in a square shape of area 1 cm 2 and thickness 0.1 mm was placed with each antimony sample. The neutron flux was determined using the standard 27 Al 24 Na reference reaction. During the irradiations, these samples were wrapped in 0.011-mmthick aluminium foil to prevent radioactive contamination from one another and to the surrounding.…”

Section: A Sample Preparationmentioning

confidence: 99%

“…These activated samples emit characteristic γ-rays having a suitable half-life with γ-ray transition probability. The neutron activation cross sections for the selected reactions were calculated relative to the 27 Al 24 Na reference reaction cross section using the following formula, where and are sample and monitor reaction cross sections, C is the γ-ray peak count, λ is the decay constant, ε is the efficiency for the characteristic γ-ray of the radionuclide, is the γ-ray abundance, Wt. is the weight, Abu.…”

Section: A Cross Section Calculationsmentioning

confidence: 99%

Systematic study of the (n, 2n) reaction cross section for ¹²¹Sb and ¹²³Sb isotopes

Singh¹,

Singh²,

Chauhan³

et al. 2022

Chinese Phys. C

View full text Add to dashboard Cite

The cross sections of the 121Sb(n,2n) 120Sbm and 123Sb(n,2n) 122Sb reactions were measured at 12.50, 15.79 and 18.87 MeV neutron energies relative to the standard 27Al(n,α) 24Na monitor reaction using neutron activation and offline γ-ray spectrometry technique. Irradiations of the samples were performed at the BARC-TIFR Pelletron Linac Facility, Mumbai, India. The quasi-monoenergetic neutron was generated via the 7Li(p,n) reaction. Statistical model calculations were performed by nuclear reaction codes TALYS (ver. 1.9) and EMPIRE (ver. 3.2.2) using various input parameters and nuclear level density models. The cross sections of the ground and the isomeric state as well as the isomeric cross section ratio were studied theoretically from reaction threshold to 26 MeV energies. The effect of pre-equilibrium emission is also discussed in detail using different theoretical models. The present measured cross section were discussed and compared with reported experimental data and evaluation data of the JEFF-3.3, ENDF/B-VIII.0, JENDL/AD-2017 and TENDL-2019 libraries. A detailed analysis of the uncertainties in the measured cross section data was performed using the covariance analysis method. Furthermore, a systematic study of the (n,2n) reaction cross section for 121Sb and 123Sb isotopes were also performed within 14-15 MeV neutron energies using various systematic formulae. This work helps to overcome discrepancies in Sb data and illustrate a better understanding of pre-equilibrium emission in (n,2n) reaction channel.

show abstract

Single-particle behaviour in fast neutron (n, 2n) reactions

Cited by 33 publications

References 45 publications

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Bacteriophage receptors on Listeria monocytogenes cells are the N-acetylglucosamine and rhamnose substituents of teichoic acids or the peptidoglycan itself

Systematic study of the (n, 2n) reaction cross section for ¹²¹Sb and ¹²³Sb isotopes

Contact Info

Product

Resources

About

Single-particle behaviour in fast neutron (n, 2n) reactions

Cited by 33 publications

References 45 publications

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched112Sn targets with reference to111In productionviaradioisotope generator112Sn(n, 2n)111Sn →111In

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched112Sn targets with reference to111In productionviaradioisotope generator112Sn(n, 2n)111Sn →111In

Bacteriophage receptors on Listeria monocytogenes cells are the N-acetylglucosamine and rhamnose substituents of teichoic acids or the peptidoglycan itself

Systematic study of the (n, 2n) reaction cross section for 121Sb and 123Sb isotopes

Contact Info

Product

Resources

About

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Systematic study of the (n, 2n) reaction cross section for ¹²¹Sb and ¹²³Sb isotopes