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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：64.66(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.
island of inversion; First study of low-lying bound excited states in 
V and 
VElekes, Z.*; Juh
sz, M. M.*; Sohler, D.*; Sieja, K.*; Yoshida, Kazuki; Ogata, Kazuyuki*; Doornenbal, P.*; Obertelli, A.*; Achouri, N. L.*; Baba, Hidetada*; et al.
Physical Review C, 106(6), p.064321_1 - 064321_10, 2022/12
Times Cited Count：2 Percentile：49.92(Physics, Nuclear)The low-lying level structure of V and V was investigated for the first time. The neutron knockout reaction and inelastic proton scattering were applied for V while the neutron knock-out reaction provided the data for V. Four and five new transitions were determined for V and V, respectively. Based on the comparison to our shell-model calculations using the Lenzi-Nowacki-Poves-Sieja (LNPS) interaction, three of the observed rays for each isotope could be placed in the level scheme and assigned to the decay of the first 11/2
and 9/2 levels. The (
,
) excitation cross sections for V were analyzed by the coupled-channels formalism assuming quadrupole plus hexadecapole deformations. Due to the role of the hexadecapole deformation, V could not be unambiguously placed on the island of inversion.
neutron orbital and the 
shell closure in 
CaEnciu, M.*; Liu, H. N.*; Obertelli, A.*; Doornenbal, P.*; Nowacki, F.*; Ogata, Kazuyuki*; Poves, A.*; Yoshida, Kazuki; Achouri, N. L.*; Baba, Hidetada*; et al.
Physical Review Letters, 129(26), p.262501_1 - 262501_7, 2022/12
Times Cited Count：5 Percentile：65.23(Physics, Multidisciplinary)The one-neutron knockout from Ca was performed at 
230 MeV/nucleon combined with prompt spectroscopy. The momentum distributions corresponding to the removal of 
and 
neutrons were measured. The cross sections are consistent with a shell closure at the neutron number , found as strong as at 
and 
in Ca isotopes from the same observables. The analysis of the momentum distributions leads to a difference of the root-mean-square radii of the neutron 
and orbitals of 0.61(23) fm, in agreement with the modified-shell-model prediction of 0.7 fm suggesting that the large root-mean-square radius of the orbital in neutron-rich Ca isotopes is responsible for the unexpected linear increase of the charge radius with the neutron number.
Ca; Spectroscopy of 
K, Ca, and 
CaKoiwai, Takuma*; Wimmer, K.*; Doornenbal, P.*; Obertelli, A.*; Barbieri, C.*; Duguet, T.*; Holt, J. D.*; Miyagi, Takayuki*; Navrtil, P.*; Ogata, Kazuyuki*; et al.
Physics Letters B, 827, p.136953_1 - 136953_7, 2022/04
Times Cited Count：4 Percentile：74.12(Astronomy & Astrophysics)no abstracts in English
Cl isotopesLinh, B. D.*; Corsi, A.*; Gillibert, A.*; Obertelli, A.*; Doornenbal, P.*; Barbieri, C.*; Chen, S.*; Chung, L. X.*; Duguet, T.*; G
mez-Ramos, M.*; et al.
Physical Review C, 104(4), p.044331_1 - 044331_16, 2021/10
Times Cited Count：6 Percentile：63.69(Physics, Nuclear)no abstracts in English
Ca from direct reactionsBrowne, F.*; Chen, S.*; Doornenbal, P.*; Obertelli, A.*; Ogata, Kazuyuki*; Utsuno, Yutaka; Yoshida, Kazuki; Achouri, N. L.*; Baba, Hidetada*; Calvet, D.*; et al.
Physical Review Letters, 126(25), p.252501_1 - 252501_7, 2021/06
Times Cited Count：10 Percentile：74.2(Physics, Multidisciplinary)Direct proton-knockout reactions of Sc were studied at the RIKEN Radioactive Isotope Beam Factory. Populated states of Ca were investigated through -ray and invariant-mass spectroscopy. Level energies were calculated from the nuclear shell model employing a phenomenological inter-nucleon interaction. Theoretical cross sections to states were calculated from distorted-wave impulse approximation estimates multiplied by the shell model spectroscopic factors. Despite the calculations showing a significant amplitude of excited neutron configurations in the ground-state of Sc, valence proton removals populated predominantly the ground-state of Ca. This counter-intuitive result is attributed to pairing effects leading to a dominance of the ground-state spectroscopic factor. Owing to the ubiquity of the pairing interaction, this argument should be generally applicable to direct knockout reactions from odd-even to even-even nuclei.
Ar by the (,2) reactionJuhsz, M. M.*; Elekes, Z.*; Sohler, D.*; Utsuno, Yutaka; Yoshida, Kazuki; Otsuka, Takaharu*; Ogata, Kazuyuki*; Doornenbal, P.*; Obertelli, A.*; Baba, Hidetada*; et al.
Physics Letters B, 814, p.136108_1 - 136108_8, 2021/03
Times Cited Count：5 Percentile：63.69(Astronomy & Astrophysics)The nuclear structure of Ar was studied by the (,2) reaction using -ray spectroscopy for the bound and unbound states. Comparing the results to our shell-model calculations, two bound and six unbound states were established. The low cross sections populating the two bound states of Ar could be interpreted as a clear signature for the presence of significant sub-shell closures at neutron numbers 32 and 34 in argon isotopes.
= 32 shell closure below calcium; Low-lying structure of 
ArCort
s, M. L.*; Rodriguez, W.*; Doornenbal, P.*; Obertelli, A.*; Holt, J. D.*; Menndez, J.*; Ogata, Kazuyuki*; Schwenk, A.*; Shimizu, Noritaka*; Simonis, J.*; et al.
Physical Review C, 102(6), p.064320_1 - 064320_9, 2020/12
Times Cited Count：11 Percentile：78.75(Physics, Nuclear)Low-lying excited states in the = 32 isotope Ar were investigated by in-beam -ray spectroscopy following proton- and neutron-knockout, multinucleon removal, and proton inelastic scattering at the RIKEN Radioactive Isotope Beam Factory. The energies of the two previously reported transitions have been confirmed, and five additional states are presented for the first time, including a candidate for a 3 state. The level scheme built using coincidences was compared to shell-model calculations in the 
model space and to 
predictions based on chiral two- and three-nucleon interactions. Theoretical proton- and neutron-knockout cross sections suggest that two of the new transitions correspond to 2
states, while the previously proposed 4
state could also correspond to a 2 state.
Singh, H.*; Ray, D.*; Kumar, S.*; Takata, Shinichi; Aswal, V. K.*; Seto, Hideki
Physical Review E, 102(6), p.062601_1 - 062601_11, 2020/12
Times Cited Count：10 Percentile：73.47(Physics, Fluids & Plasmas) = 40 isotones towards Ca; First spectroscopy of 
TiCorts, M. L.*; Rodriguez, W.*; Doornenbal, P.*; Obertelli, A.*; Holt, J. D.*; Lenzi, S. M.*; Menndez, J.*; Nowacki, F.*; Ogata, Kazuyuki*; Poves, A.*; et al.
Physics Letters B, 800, p.135071_1 - 135071_7, 2020/01
Times Cited Count：31 Percentile：96.48(Astronomy & Astrophysics)Excited states in the = 40 isotone Ti were populated via the 
V(,
)Ti reaction at 200 MeV/nucleon at the Radioactive Isotope Beam Factory and studied using -ray spectroscopy. The energies of the 
and 
transitions, observed here for the first time, indicate a deformed Ti ground state. These energies are increased compared to the neighboring 
Cr and 
Fe isotones, suggesting a small decrease of quadrupole collectivity. The present measurement is well reproduced by large-scale shell-model calculations based on effective interactions, while ab initio and beyond mean-field calculations do not yet reproduce our findings.
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：49 Percentile：92.61(Physics, Multidisciplinary)no abstracts in English
Wang, H.*; Otsu, Hideaki*; Chiga, Nobuyuki*; Kawase, Shoichiro*; Takeuchi, Satoshi*; Sumikama, Toshiyuki*; Koyama, Shumpei*; Sakurai, Hiroyoshi*; Watanabe, Yukinobu*; Nakayama, Shinsuke; et al.
Communications Physics (Internet), 2(1), p.78_1 - 78_6, 2019/07
Times Cited Count：8 Percentile：55.71(Physics, Multidisciplinary)Searching for effective pathways for the production of proton- and neutron-rich isotopes through an optimal combination of reaction mechanism and energy is one of the main driving forces behind experimental and theoretical nuclear reaction studies as well as for practical applications in nuclear transmutation of radioactive waste. We report on a study on incomplete fusion induced by deuteron, which contains one proton and one neutron with a weak binding energy and is easily broken up. This reaction study was achieved by measuring directly the cross sections for both proton and deuteron for 
Pd at 50 MeV/u via inverse kinematics technique. The results provide direct experimental evidence for the onset of a cross-section enhancement at high energy, indicating the potential of incomplete fusion induced by loosely-bound nuclei for creating proton-rich isotopes and nuclear transmutation of radioactive waste.
Ne by proton knockout reactionsMurray, I.*; MacCormick, M.*; Bazin, D.*; Doornenbal, P.*; Aoi, Nori*; Baba, Hidetada*; Crawford, H. L.*; Fallon, P.*; Li, K.*; Lee, J.*; et al.
Physical Review C, 99(1), p.011302_1 - 011302_7, 2019/01
Times Cited Count：17 Percentile：85.25(Physics, Nuclear)no abstracts in English
Wray, L. A.*; Huang, S.-W.*; Jarrige, I.*; Ikeuchi, Kazuhiko*; Ishii, Kenji; Li, J.*; Qiu, Z. Q.*; Hussain, Z.*; Chuang, Y.-D.*
Frontiers in Physics (Internet), 3, p.32_1 - 32_11, 2015/05
Times Cited Count：4
,
) spectra at energies below 50 MeV in Monte Carlo simulation by intra-nuclear cascade code with distorted wave born approximationHashimoto, Shintaro; Iwamoto, Yosuke; Sato, Tatsuhiko; Niita, Koji*; Boudard, A.*; Cugnon, J.*; David, J.-C.*; Leray, S.*; Mancusi, D.*
Nuclear Instruments and Methods in Physics Research B, 333, p.27 - 41, 2014/08
Times Cited Count：23 Percentile：86.14(Instruments & Instrumentation)Recently, accelerator-based neutron sources have been considered for scientific research and medical applications, where deuteron-induced reactions of Li, Be, or C targets at low (
50 MeV) incident energies are essential to produce high-intensity neutron beams. Description of the reactions in simulations of particle transport are required to estimate dose distributions. In this study, we developed a new method that combines the Intra-Nuclear Cascade of Li
ge (INCL) and Distorted Wave Born Approximation (DWBA), and incorporated it into the Particle and Heavy Ion Transport code System (PHITS). A proton-stripping process and transitions between discrete states of nuclei are considered in the method by INCL and DWBA, respectively. We applied the method to reproduce neutron spectra in the reactions on thin and thick targets. Results obtained by PHITS with the method successfully agreed with experimental data, which were not reproduced by the old model.
Hashimoto, Shintaro; Iwamoto, Yosuke; Sato, Tatsuhiko; Niita, Koji*; Boudard, A.*; Cugnon, J.*; David, J.-C.*; Leray, S.*; Mancusi, D.*
Progress in Nuclear Science and Technology (Internet), 4, p.418 - 421, 2014/04
There is a growing interest in the use of accelerator-based neutron sources for scientific and medical applications. For neutron source design, computer codes that can evaluate neutron yields are indispensable; PHITS (Particle and Heavy Ion Transport code System) is one of suitable candidates. In this study, we proposed a new nuclear reaction model based on INCL coupled with the DWBA calculation for an accurate calculation of neutron yields. The DWBA calculation describes discrete peaks in neutron spectra. Although these peaks are not the major part of neutron sources, the estimation of their contributions is necessary, since neutrons from the peaks have high energies close to those of the incident particle. We will present the calculation method of our approach and results for proton and deuteron induced reactions on Li, Be, and C targets at incident energies from 10 to 100 MeV.
Titarenko, Yu. E.*; Batyaev, V. F.*; Butko, M. A.*; Dikarev, D. V.*; Florya, S. N.*; Pavlov, K. V.*; Titarenko, A. Yu.*; Tikhonov, R. S.*; Zhivun, V. M.*; Ignatyuk, A. V.*; et al.
Physical Review C, 84(6), p.064612_1 - 064612_19, 2011/11
Times Cited Count：22 Percentile：76.93(Physics, Nuclear)Nuclide production cross sections measured at the Institute for Theoretical and Experimental Physics (ITEP) for the targets of 
Cr, Fe, Ni, 
Nb, 
Ta, W, Pb, and 
Bi irradiated by protons with energies from 40 to 2600 MeV were used to estimate the predictive accuracy of several popular high-energy transport codes. A general agreement of the ITEP data with the data obtained by other groups, including the numerous GSI data measured by the inverse kinematics method was found. Simulations of the measured data were performed with a number of codes. Deviation factors between the calculated and experimental cross sections have been estimated for each target and for the whole energy range covered by our measurements. Further improvements of all tested here codes are recommended. In addition, new measurements at ITEP of nuclide yields from the 
Pb target irradiated by 500-MeV protons are presented.
Titarenko, Yu. E.*; Batyaev, V. F.*; Butko, M. A.*; Dikarev, D. V.*; Florya, S. N.*; Pavlov, K. V.*; Titarenko, A. Yu.*; Tikhonov, R. S.*; Zhivun, V. M.*; Ignatyuk, A. V.*; et al.
LA-UR-11-02704, 31 Pages, 2011/06
Nuclide production cross sections measured at ITEP for the targets of 
Cr, Fe,Ni, Nb, Ta, W, Pb, Bi irradiated by protons with energies from 40 to 2600 MeV were used to estimate the predictive accuracy of several popular high-energy transport codes. A general agreement of the ITEP data with the data obtained by other groups, including the numerous GSI data measured by the inverse kinematics method was found. Simulations of the measured data were performed with the MCNPX (Bertini and ISABEL options), CEM03.02, INCL4.2+ABLA, INCL4.5+ABLA07, PHITS, and CASCADE.07 codes. Deviation factors between the calculated and experimental cross sections have been estimated for each target and for the whole energy range covered by our measurements. Further improvements of all tested here codes are recommended.
Fe and Cr targets irradiated with 0.04- to 2.6-GeV protonsTitarenko, Yu. E.*; Batyaev, V. F.*; Titarenko, A. Yu.*; Butko, M. A.*; Pavlov, K. V.*; Florya, S. N.*; Tikhonov, R. S.*; Zhivun, V. M.*; Ignatyuk, A. V.*; Mashnik, S. G.*; et al.
Physics of Atomic Nuclei, 74(4), p.523 - 536, 2011/04
Times Cited Count：15 Percentile：66.87(Physics, Nuclear)The cross sections for nuclide production in thin Fe and Cr targets irradiated by 0.04 to 2.6 GeV protons are measured by direct spectrometry using two spectrometers with the resolutions of 1.8 and 1.7 keV for the Co 1332 keV line. As a result, 649 yields of radioactive residual product nuclei have been obtained. The 
Al(, 
)
Na reaction has been used as a monitor reaction. The experimental data are compared with the MCNPX (BERTINI, ISABEL), CEM03.02, INCL4.2, INCL4.5, PHITS, and CASCADE07 calculations.
Nb and Ni targets irradiated with 0.04- to 2.6-GeV protonsTitarenko, Yu. E.*; Batyaev, V. F.*; Titarenko, A. Yu.*; Butko, M. A.*; Pavlov, K. V.*; Florya, S. N.*; Tikhonov, R. S.*; Zhivun, V. M.*; Ignatyuk, A. V.*; Mashnik, S. G.*; et al.
Physics of Atomic Nuclei, 74(4), p.537 - 550, 2011/04
Times Cited Count：22 Percentile：76.93(Physics, Nuclear)The cross sections for nuclide production in thin Nb and Ni targets irradiated by 0.04 to 2.6 GeV protons are measured by direct spectrometry using two spectrometers with the resolutions of 1.8 and 1.7 keV for the Co 1332-keV line. As a result, 1112 yields of radioactive residual product nuclei have been obtained. The Al(, )Na reaction has been used as a monitor reaction. The experimental data are compared with the MCNPX (BERTINI, ISABEL), CEM03.02, INCL4.2, INCL4.5, PHITS, and CASCADE07 calculations.
