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Ogata, Kazuyuki*; Yoshida, Kazuki; Chazono, Yoshiki*
Computer Physics Communications, 297, p.109058_1 - 109058_16, 2024/04
Times Cited Count：0PIKOE is a Fortran 90 program that calculates triple- and quadruple-differential cross sections, vector analyzing powers, and momentum distributions of reaction residues, for proton-induced nucleon knockout reactions in normal and inverse kinematics. The distorted-wave impulse approximation is adopted, and the distorted waves are calculated quantum mechanically. Kinematics of the reaction particles are treated in a relativistic manner, which gives the proper asymptotics of the three-body scattering wave in the plane-wave limit.
Ca cast doubt on a doubly magic 
CaChen, S.*; Browne, F.*; Doornenbal, P.*; Lee, J.*; Obertelli, A.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; Chazono, Yoshiki*; Hagen, G.*; Holt, J. D.*; et al.
Physics Letters B, 843, p.138025_1 - 138025_7, 2023/08
Times Cited Count：1 Percentile：0.02(Astronomy & Astrophysics)Gamma decays were observed in 
Ca and 
Ca following quasi-free one-proton knockout reactions from 
Sc. For Ca, a 
ray transition was measured to be 1456(12) keV, while for Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the 
decays. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for 
level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the N = 34 shell. Its constituents, the 
and 
orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic Ca and potentially drives the dripline of Ca isotopes to 
Ca or even beyond.
knockout reactionsEdagawa, Tomoatsu*; Yoshida, Kazuki; Chazono, Yoshiki*; Ogata, Kazuyuki*
Physical Review C, 107(5), p.054603_1 - 054603_7, 2023/05
Times Cited Count：2 Percentile：85.93(Physics, Nuclear)The effective polarization of the residual nucleus in the proton-induced knockout reaction is investigated within the distorted wave impulse approximation framework. The strong absorption of the emitted particle results in strong selectivity on the reaction "position" depending on the third component of the single-particle orbital angular momentum of the particle inside a nucleus, hence on the spin direction of the reaction residue.
Chazono, Yoshiki*; Yoshida, Kazuki; Ogata, Kazuyuki*
Physical Review C, 106(6), p.064613_1 - 064613_10, 2022/12
Times Cited Count：1 Percentile：33.4(Physics, Nuclear)As a new cluster phenomenon in nuclei, a deuteron like pn cluster is in our interest. The traditional alpha cluster state can be probed by the knockout reaction analysis assuming the alpha particle is inert because the alpha particle is tightly bound. On the other hand, since deuteron is fragile, deuteron cannot be treated as an inert particle in describing the reaction. In this work, we treated the breakup and reformation of the deuteron (p-n pair) by describing the p, n, and the reaction residue in the final channel as a three body scattering state using the continuum discretized coupled channels method. We showed that the interference between the deuteron ground state and the breakup states are strong and has to be included in the deuteron knockout reaction analysis.
Chazono, Yoshiki*; Yoshida, Kenichi*; Yoshida, Kazuki; Ogata, Kazuyuki*
Physical Review C, 103(2), p.024609_1 - 024609_7, 2021/02
Times Cited Count：2 Percentile：34.88(Physics, Nuclear)The isoscalar 
pair is expected to emerge in nuclei. We aim to clarify the correspondence between the pairing strength in many-body calculation and the cross section of proton-induced deuteron knockout (
, 
) reaction on 
O. The radial wave function of the isoscalar pair with respect to the center of O is calculated with the energy density functional (EDF) approach and is implemented in the distorted wave impulse approximation framework. The pairing strength 
in the EDF calculation is varied and the corresponding change in the cross section is investigated. A clear dependence of the cross section is found. The nuclear distortion is found to make the dependence stronger. Because of the clear -coross section correspondence, the (, ) reaction will be a promising probe for the isoscalar pair in nuclei. For quantitative discussion, further modification of the description of the reaction process will be necessary.
energy splitting in odd-K isotopes towards 
Sun, Y. L.*; Obertelli, A.*; Doornenbal, P.*; Barbieri, C.*; Chazono, Yoshiki*; Duguet, T.*; Liu, H. N.*; Navr
til, P.*; Nowacki, F.*; Ogata, Kazuyuki*; et al.
Physics Letters B, 802, p.135215_1 - 135215_7, 2020/03
Times Cited Count：26 Percentile：94.54(Astronomy & Astrophysics)no abstracts in English
Ca corroborates arising 
neutron magic numberChen, S.*; Lee, J.*; Doornenbal, P.*; Obertelli, A.*; Barbieri, C.*; Chazono, Yoshiki*; Navrtil, P.*; Ogata, Kazuyuki*; Otsuka, Takaharu*; Raimondi, F.*; et al.
Physical Review Letters, 123(14), p.142501_1 - 142501_7, 2019/10
Times Cited Count：47 Percentile：92.65(Physics, Multidisciplinary)no abstracts in English
