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Akaishi, Takaya; Hashimoto, Tadashi; Tanida, Kiyoshi; 35 of others*
Physics Letters B, 845(10), p.138128_1 - 138128_4, 2023/10
Chen, 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
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.
Wang, H.*; Yasuda, Masahiro*; Kondo, Yosuke*; Nakamura, Takashi*; Tostevin, J. A.*; Ogata, Kazuyuki*; Otsuka, Takaharu*; Poves, A.*; Shimizu, Noritaka*; Yoshida, Kazuki; et al.
Physics Letters B, 843, p.138038_1 - 138038_9, 2023/08
Detailed -ray spectroscopy of the exotic neon isotope
Ne has been performed using the one-neutron removal reaction from
Ne. Based on an analysis of parallel momentum distributions, a level scheme with spin-parity assignments has been constructed for
Ne and the negative-parity states are identified for the first time. The measured partial cross sections and momentum distributions reveal a significant intruder p-wave strength providing evidence of the breakdown of the N = 20 and N = 28 shell gaps. Only a weak, possible f-wave strength was observed to bound final states. Large-scale shell-model calculations with different effective interactions do not reproduce the large p-wave and small f-wave strength observed experimentally, indicating an ongoing challenge for a complete theoretical description of the transition into the island of inversion along the Ne isotopic chain.
Xia, C.-J.*; Maruyama, Toshiki; Yasutake, Nobutoshi*; Tatsumi, Toshitaka*; Zhang, Y.-X.*
Physics Letters B, 839, p.137769_1 - 137769_5, 2023/04
Times Cited Count:1 Percentile:83.96(Astronomy & Astrophysics)Revel, A.*; Wu, J.*; Iwasaki, Hironori*; Ash, J.*; Bazin, D.*; Brown, B. A.*; Chen, J.*; Elder, R.*; Farris, P.*; Gade, A.*; et al.
Physics Letters B, 838, p.137704_1 - 137704_7, 2023/03
no abstracts in English
Aikawa, Shu*; Hashimoto, Tadashi; Tanida, Kiyoshi; 73 of others*
Physics Letters B, 837, p.137637_1 - 137637_8, 2023/02
Times Cited Count:0 Percentile:0.02(Astronomy & Astrophysics)Huang, H.*; Zhang, W. Q.*; Andreyev, A. N.; Liu, Z.*; Seweryniak, D.*; Li, Z. H.*; Guo, C. Y.*; Barzakh, A. E.*; Van Duppen, P.*; Andel, B.*; et al.
Physics Letters B, 833, p.137345_1 - 137345_8, 2022/10
Times Cited Count:0 Percentile:0.02(Astronomy & Astrophysics)Zhang, W. Q.*; Andreyev, A. N.; Liu, Z.*; Seweryniak, D.*; Huang, H.*; Li, Z. H.*; Li, J. G.*; Guo, C. Y.*; 34 of others*
Physics Letters B, 829, p.137129_1 - 137129_7, 2022/06
Times Cited Count:3 Percentile:81.11(Astronomy & Astrophysics)Koiwai, 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:2 Percentile:69.47(Astronomy & Astrophysics)no abstracts in English
Meng, Q.*; Harada, Masayasu*; Hiyama, Emiko; Hosaka, Atsushi; Oka, Makoto
Physics Letters B, 824, p.136800_1 - 136800_5, 2022/01
Times Cited Count:10 Percentile:97.75(Astronomy & Astrophysics)Spectrum of the doubly heavy tetraquarks, , is studied in a constituent quark model. Four-body problem is solved in a variational method where the real scaling technique is used to identify resonant states above the fall-apart decay thresholds. In addition to the two bound states that were reported in the previous study we have found several narrow resonant states above the
and
thresholds. Their structures are studied and are interpreted by the quark dynamics. A narrow resonance with spin-parity
is found to be a mixed state of a compact tetraquark and a
scattering state. This is driven by a strong color Coulombic attraction between the
quarks. Negative-parity excited resonances with
,
and
form a triplet under the heavy-quark spin symmetry. It turns out that they share a similar structure to the
-mode of a singly heavy baryon as a result of the strongly attractive correlation for the doubly heavy diquark.
Kitamura, Noritaka*; Wimmer, K.*; Poves, A.*; Shimizu, Noritaka*; Tostevin, J. A.*; Bader, V. M.*; Bancroft, C.*; Barofsky, D.*; Baugher, T.*; Bazin, D.*; et al.
Physics Letters B, 822, p.136682_1 - 136682_7, 2021/11
Times Cited Count:4 Percentile:56.39(Astronomy & Astrophysics)no abstracts in English
Tonev, D.*; De Angelis, G.*; Deloncle, I.*; Orlandi, R.; 27 of others*
Physics Letters B, 821, p.136603_1 - 136603_6, 2021/10
Times Cited Count:5 Percentile:74.34(Astronomy & Astrophysics)Pavao, R.*; Gubler, P.; Fernandez-Soler, P.*; Nieves, J.*; Oka, Makoto; Takahashi, Toru*
Physics Letters B, 820, p.136473_1 - 136473_8, 2021/09
Times Cited Count:3 Percentile:56.39(Astronomy & Astrophysics)Iwasaki, Sachio*; Jido, Daisuke*; Oka, Makoto; Suzuki, Kei
Physics Letters B, 820, p.136498_1 - 136498_6, 2021/09
Times Cited Count:1 Percentile:24.48(Astronomy & Astrophysics)We investigate time evolution of -wave charmonium populations under a time-dependent homogeneous magnetic field and evaluate survival probabilities of the low-lying charmonia to the goal of estimating the magnetic field strength at heavy-ion collisions. Our approach implements mixing between different spin eigenstates and transitions to radially excited states. We show that the survival probabilities can change even by an extremely short magnetic field. Furthermore, we find that the survival probabilities depend on the initial spin states. We propose the sum of the survival probabilities over spin partners as an observable insensitive to the initial states. We also find that the sum can be approximately given as a function of
with a duration time
and the maximum strength of the magnetic field
.
Muto, Takumi*; Maruyama, Toshiki; Tatsumi, Toshitaka*
Physics Letters B, 820, p.136587_1 - 136587_6, 2021/09
Times Cited Count:2 Percentile:42.93(Astronomy & Astrophysics)no abstracts in English
Meng, Q.*; Hiyama, Emiko*; Hosaka, Atsushi; Oka, Makoto; Gubler, P.; Can, K. U.*; Takahashi, Toru*; Zong, H. S.*
Physics Letters B, 814, p.136095_1 - 136095_6, 2021/03
Times Cited Count:29 Percentile:98.69(Astronomy & Astrophysics)Juhsz, 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:3 Percentile:56.39(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.
Watanabe, Hiroshi*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Andreyev, A. N.; Hashimoto, Takashi*; Kondev, F. G.*; Lane, G. J.*; Litvinov, Yu. A.*; Liu, J. J.*; Miyatake, Hiroari*; et al.
Physics Letters B, 814, p.136088_1 - 136088_6, 2021/03
Times Cited Count:1 Percentile:24.48(Astronomy & Astrophysics)Song, T.*; Gubler, P.; Hong, J.*; Lee, S. H.*; Morita, Kenji*
Physics Letters B, 813, p.136065_1 - 136065_5, 2021/02
Times Cited Count:2 Percentile:42.93(Astronomy & Astrophysics)Ishikawa, Tsutomu*; Nakayama, Katsumasa*; Suzuki, Kei
Physics Letters B, 809, p.135713_1 - 135713_7, 2020/10
Times Cited Count:8 Percentile:70.75(Astronomy & Astrophysics)We propose a definition of the Casimir energy for free lattice fermions. From this definition, we study the Casimir effects for the massless or massive naive fermion, Wilson fermion, and (Mbius) domain-wall fermion in 1+1 dimensional spacetime with the spatial periodic or antiperiodic boundary condition. For the naive fermion, we find an oscillatory behavior of the Casimir energy, which is caused by the difference between odd and even lattice sizes. For the Wilson fermion, in the small lattice size of
, the Casimir energy agrees very well with that of the continuum theory, which suggests that we can control the discretization artifacts for the Casimir effect measured in lattice simulations. We also investigate the dependence on the parameters tunable in M
bius domain-wall fermions. Our findings will be observed both in condensed matter systems and in lattice simulations with a small size.