scholarly journals Neutron capture cross sections of the Zr isotopes: probing neutron exposure and neutron flux in Red Giants

2010 ◽  
Author(s):  
Giuseppe Tagliente ◽  
U. Abbondanno ◽  
G. Aerts ◽  
H. Álvarez-Pol ◽  
F. Alvarez-Velarde ◽  
...  
Keyword(s):  
Neutron Flux ◽  
Cross Sections ◽  
Neutron Capture ◽  
Red Giants ◽  
Capture Cross ◽  
Neutron Exposure ◽  
Capture Cross Sections

scholarly journals Galactic Ba Enrichment from TP-AGB Stars

1993 ◽  
Vol 155 ◽  
pp. 580-580
Author(s):  
C. M. Raiteri ◽  
M. Busso ◽  
F. Matteucci ◽  
R. Gallino
Keyword(s):  
Cross Sections ◽  
Neutron Capture ◽  
Nuclear Physics ◽  
Asymptotic Giant Branch ◽  
Agb Stars ◽  
Capture Cross ◽  
Strong Indication ◽  
Low Mass ◽  
Neutron Exposure ◽  
Capture Cross Sections

The production of the bulk of barium has long been ascribed to the main component of the s-process, whose astrophysical site has been envisaged in the convective He shell of Thermally Pulsing Asymptotic Giant Branch (TP-AGB) stars of low mass (1–3 M⊙; see Käppeler et al. 1990). The main neutron source is the 13C(α, n)16O reaction, operating at the thermal energy of kT = 12keV. We have calculated neutron captures in such environment with an updated nuclear physics, adopting the neutron capture cross sections of Beer, Voß, & Winters (1992) together with their temperature-dependence. Stellar models producing a mean neutron exposure of τ0 ≃ 0.30 mb−1 are able to reproduce the solar distribution of the s-abundances satisfactory, but the Ba isotopes show some overproduction. Such a strong indication suggests a revision of the Ba cross sections (see Gallino, Raiteri, & Busso 1992). Once that a suitable choice of σn, γ(Ba) is made, it is found that a r-contribution to solar Ba of the order of 10% can be expected.

PILE NEUTRON CAPTURE CROSS SECTIONS OF Co60* (10.5 MIN.) AND Co60 (5.25 YR.)

1953 ◽  
Vol 31 (6) ◽  
pp. 903-910 ◽  
Author(s):  
F. Brown ◽  
J. L. Wolfson ◽  
L. Yaffe
Keyword(s):  
Neutron Flux ◽  
Cross Sections ◽  
Neutron Capture ◽  
Half Life ◽  
Capture Cross ◽  
High Neutron ◽  
Capture Cross Sections

Activity of approximately 105 min. half-life has been detected in samples of Co59 irradiated at high neutron fluxes in the NRX reactor. By a study of the yield as a function of neutron flux and time of irradiation this activity was demonstrated to be due to Co61 (105 min.) formed by neutron capture in Co60. The pile neutron capture cross sections were found to be 95 ± 45 barns and 6.0 ± 1.4 barns for the Co60* (10.5 min.) and Co60 (5.25 yr.) isomers respectively.

THERMAL NEUTRON CAPTURE CROSS-SECTION OF Na23 AND Mn55

1953 ◽  
Vol 31 (3) ◽  
pp. 204-206 ◽  
Author(s):  
Rosalie M. Bartholomew ◽  
R. C. Hawkings ◽  
W. F. Merritt ◽  
L. Yaffe
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Cross Sections ◽  
Neutron Capture ◽  
Half Life ◽  
Capture Cross Section ◽  
Thermal Neutron Capture ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
Capture Cross Sections

The thermal neutron capture cross sections of Na23 and Mn55 have been determined using the activation method. The values are 0.53 ± 0.03 and 12.7 ± 0.3 barns respectively with respect to σAul97 = 93 barns. These agree well with recent pile oscillator results. The half-life for Mn56 is found to be 2.576 ± 0.002 hr.

Neutron capture cross-sections by comparative γ-activation

1986 ◽  
Vol 13 (5) ◽  
pp. 287-288 ◽  
Author(s):  
H.S. Sahota ◽  
V.K. Mittal ◽  
N.P.S. Sidhu
Keyword(s):  
Cross Sections ◽  
Neutron Capture ◽  
Capture Cross ◽  
Capture Cross Sections

scholarly journals Determining neutron capture cross sections via the surrogate reaction technique

2007 ◽  
Vol 75 (5) ◽  
Author(s):  
C. Forssén ◽  
F. S. Dietrich ◽  
J. Escher ◽  
R. D. Hoffman ◽  
K. Kelley
Keyword(s):  
Cross Sections ◽  
Neutron Capture ◽  
Capture Cross ◽  
Capture Cross Sections

scholarly journals Precise Measurements of Neutron Capture Cross Sections for LLFPs and MAs

2014 ◽  
pp. 39-46
Author(s):  
S. Nakamura ◽  
A. Kimura ◽  
M. Ohta ◽  
T. Fujii ◽  
S. Fukutani ◽  
...  
Keyword(s):  
Cross Sections ◽  
Neutron Capture ◽  
Capture Cross ◽  
Capture Cross Sections
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