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Journal Articles

High accuracy, high resolution $$^{235}$$U(n,f) cross section from n_TOF (CERN) from 18 meV to 10 keV

Mastromarco, M.*; Amaducci, S.*; Colonna, N.*; Kimura, Atsushi; 118 of others*

European Physical Journal A, 58(8), p.147_1 - 147_13, 2022/08

 Times Cited Count:0 Percentile:0.02(Physics, Nuclear)

no abstracts in English

Journal Articles

Status and perspectives of the neutron time-of-flight facility n_TOF at CERN

Chiaveri, E.*; Aberle, O.*; Alcayne, V.*; Kimura, Atsushi; 124 of others*

EPJ Web of Conferences, 239, p.17001_1 - 17001_8, 2020/09

 Times Cited Count:3 Percentile:92.15

Journal Articles

Monte Carlo simulations and n-p differential scattering data measured with Proton Recoil Telescopes

Terranova, N.*; Aberle, O.*; Alcayne, V.*; Kimura, Atsushi; 125 of others*

EPJ Web of Conferences, 239, p.01024_1 - 01024_5, 2020/09

 Times Cited Count:2 Percentile:92.15

Journal Articles

Setup for the measurement of the $$^{235}$$U(n, f) cross section relative to n-p scattering up to 1 GeV

Manna, A.*; Aberle, O.*; Alcayne, V.*; Kimura, Atsushi; 125 of others*

EPJ Web of Conferences, 239, p.01008_1 - 01008_5, 2020/09

 Times Cited Count:3 Percentile:96.13

Journal Articles

Measurement of the $$^{235}$$U(n, f) cross section relative to the $$^{6}$$Li(n, t) and $$^{10}$$B(n, $$alpha$$) standards from thermal to 170 keV neutron energy range at n_TOF

Amaducci, S.*; Harada, Hideo; Kimura, Atsushi; 118 of others*

European Physical Journal A, 55(7), p.120_1 - 120_19, 2019/07

 Times Cited Count:16 Percentile:89.06(Physics, Nuclear)

The $$^{235}$$U(n, f) cross section was measured at n_TOF relative to $$^{6}$$Li(n, t) and $$^{10}$$B(n, $$alpha$$), in a wide energy range (25 meV$$sim$$170 keV) with 1.5% systematic uncertainty, making use of a stack of six samples and six silicon detectors placed in the neutron beam. The present results indicate that the cross section in the 9$$sim$$18 keV neutron energy range is indeed overestimated by almost 5% in the recently released evaluated data files ENDF/B-VIII.0 and JEFF3.3. Furthermore, these new high-resolution data confirm the existence of resonance-like structures in the keV neutron energy region. From the present data, a value of 249.7$$pm$$1.4(stat)$$pm$$0.94(syst) b eV has been extracted for the cross section integral between 7.8 and 11 eV, confirming the value of 247.5$$pm$$3 b eV recently established as a standard.

Journal Articles

Measurement of $$^{73}$$Ge(n,$$gamma$$) cross sections and implications for stellar nucleosynthesis

Lederer-Woods, C.*; Battino, U.*; Ferreira, P.*; Gawlik, A.*; Kimura, Atsushi; n_TOF Collaboration*; 128 of others*

Physics Letters B, 790, p.458 - 465, 2019/03

 Times Cited Count:7 Percentile:62.36(Astronomy & Astrophysics)

Journal Articles

Cross section measurements of $$^{155,157}$$Gd(n,$$gamma$$) induced by thermal and epithermal neutrons

Mastromarco, M.*; Manna, A.*; Aberle, O.*; Andrzejewski, J.*; Harada, Hideo; Kimura, Atsushi; n_TOF Collaboration*; 116 of others*

European Physical Journal A, 55(1), p.9_1 - 9_20, 2019/01

 Times Cited Count:21 Percentile:93.2(Physics, Nuclear)

Journal Articles

First ionization potentials of Fm, Md, No, and Lr; Verification of filling-up of 5f electrons and confirmation of the actinide series

Sato, Tetsuya; Asai, Masato; Borschevsky, A.*; Beerwerth, R.*; Kaneya, Yusuke*; Makii, Hiroyuki; Mitsukai, Akina*; Nagame, Yuichiro; Osa, Akihiko; Toyoshima, Atsushi; et al.

Journal of the American Chemical Society, 140(44), p.14609 - 14613, 2018/11

 Times Cited Count:26 Percentile:74.05(Chemistry, Multidisciplinary)

The first ionization potential (IP$$_1$$) yields information on valence electronic structure of an atom. IP$$_1$$ values of heavy actinides beyond einsteinium (Es, Z = 99), however, have not been determined experimentally so far due to the difficulty in obtaining these elements on scales of more than one atom at a time. Recently, we successfully measured IP$$_1$$ of lawrencium (Lr, Z = 103) using a surface ionization method. The result suggests that Lr has a loosely-bound electron in the outermost orbital. In contrast to Lr, nobelium (No, Z = 102) is expected to have the highest IP$$_1$$ among the actinide elements owing to its full-filled 5f and the 7s orbitals. In the present study, we have successfully determined IP$$_1$$ values of No as well as fermium (Fm, Z = 100) and mendelevium (Md, Z = 101) using the surface ionization method. The obtained results indicate that the IP$$_1$$ value of heavy actinoids would increase monotonically with filling electrons up in the 5f orbital like heavy lanthanoids.

Journal Articles

$$^7$$Be(n,p)$$^7$$Li reaction and the cosmological lithium problem; Measurement of the cross section in a wide energy range at n_TOF at CERN

Damone, L.*; Barbagallo, M.*; Mastromarco, M.*; Cosentino, L.*; Harada, Hideo; Kimura, Atsushi; n_TOF Collaboration*; 152 of others*

Physical Review Letters, 121(4), p.042701_1 - 042701_7, 2018/07

 Times Cited Count:44 Percentile:92.64(Physics, Multidisciplinary)

Journal Articles

Experimental setup and procedure for the measurement of the $$^7$$Be(n,p)$$^7$$Li reaction at n_TOF

Barbagallo, M.*; Andrzejewski, J.*; Mastromarco, M.*; Perkowski, J.*; Damone, L. A.*; Gawlik, A.*; Kimura, Atsushi; n_TOF Collaboration*; 122 of others*

Nuclear Instruments and Methods in Physics Research A, 887, p.27 - 33, 2018/04

 Times Cited Count:13 Percentile:85.26(Instruments & Instrumentation)

Journal Articles

Radiative neutron capture on $$^{242}$$Pu in the resonance region at the CERN n_TOF-EAR1 facility

Lerendegui-Marco, J.*; Guerrero, C.*; Mendoza, E.*; Quesada, J. M.*; Eberhardt, K.*; Junghans, A. R.*; Kimura, Atsushi; n_TOF Collaboration*; 126 of others*

Physical Review C, 97(2), p.024605_1 - 024605_21, 2018/02

 Times Cited Count:15 Percentile:80.99(Physics, Nuclear)

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