Nuclear Theory·nucl-th

Wednesday·March 27, 2019

6 papers—3 primary·3 cross-listed

01
Elastic scattering, inelastic excitation, and 1n pick-up transfer cross sections for $^{10}$ B+ $^{120}$ Sn at energies near the Coulomb barrier
M. A. G. Alvarez · M. Rodríguez-Gallardo · L. R. Gasques · L. C. Chamon · J. R. B. Oliveira · V. Scarduelli · A. S. Freitas · E. S. Rossi Jr. · V. A. B. Zagatto · J. Rangel · J. Lubian · I. Padron
The $^{10}$ B+ $^{120}$ Sn reaction has been systematically studied at laboratory energies around the Coulomb barrier: E $_{LAB} =$ 31.5, 33.5, 35.0, and 37.5 MeV. Cross sections for the elastic scattering and some reaction processes have been measured: excitation to the $1^{+}$ state of $^{10}$ B; excitation to the $2^{+}$ and $3^{-}$ states of $^{120}$ Sn; and the one-neutron pick-up transfer $^{120}$ Sn( $^{10}$ B, $^{11}$ B) $^{119}$ Sn. Coupled reaction channel (CRC) calculations have been performed in the context of the double-folding São Paulo potential. The theoretical calculations result in a good overall description of the experimental angular distributions. The effect on the theoretical elastic-scattering angular distributions of couplings to the inelastic and transfer states (through the CRC calculations) and to the continuum states (through continuum-discretized coupled-channels calculations) has been investigated.
nucl-thPRC(2018)·20 citations
02
Kaonic Nuclear Clusters --- a New Paradigm of Particle and Nuclear Physics ---
Y. Akaishi🇯🇵 · T. Yamazaki🇯🇵
Lambda*=Lambda(1405) plays an essential role in forming kaonic nuclear clusters (KNC). The simplest KNC, K-pp, has the structure Lambda*p=(K-p){I=0}p, where a real kaon migrates between two nucleons, mediating super-strong Lambda*-p$ attraction. Production data of K-pp have been accumulated by DISTO, J-PARC E27 and J-PARC E15 experiments. In the case of K-K-pp, the attractive covalent bond of Lambda*Lambda* is doubly enhanced compared to the Lambda*-p one. As a consequence, a m-th Lambda* multiplet, (Lambda*)m, with m(m-1)/2 bonds becomes more stable than its corresponding neutron aggregate, (n)m, with m=8 ~ 12. This may suggest the possible existence of stable Lambda* matter. The production of K-K-pp by high-energy pp or heavy-ion collisions is awaited as a doorway to so-far unknown Lambda* matter.
nucl-th5 citations
03
Further Theoretical Analysis on the $K^{-}^{3} He \to Λ p n$ Reaction for the $K ˉ N N$ Bound-State Search in the J-PARC E15 Experiment
Takayasu Sekihara (JAEA, Ibaraki)🇯🇵 · Eulogio Oset (Valencia U. & Valencia U., IFIC)🇪🇸 · Angels Ramos (Barcelona U., ECM & ICC, Barcelona U.)🇪🇸
Based on the scenario that a $K ˉ N N$ bound state is generated and it eventually decays into $Λ p$ , we calculate the cross section of the $K^{-}^{3} He \to Λ p n$ reaction, which was recently measured in the J-PARC E15 experiment. We find that the behavior of the calculated differential cross section $d^{2} σ / d M_{Λ p} d q_{Λ p}$ , where $M_{Λ p}$ and $q_{Λ p}$ are the $Λ p$ invariant mass and momentum transfer in the $(K^{-}, n)$ reaction in the laboratory frame, respectively, is consistent with the experiment. Furthermore, we can reproduce almost quantitatively the experimental data of the $Λ p$ invariant mass spectrum in the momentum transfer window $350 MeV / c < q_{Λ p} < 650 MeV / c$ . These facts strongly suggest that the $K ˉ N N$ bound state was indeed generated in the J-PARC E15 experiment.
nucl-thhep-phnucl-exJPS Conf.Proc.(2019)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

Elastic scattering, inelastic excitation, and 1n pick-up transfer cross sections for 10B+120Sn at energies near the Coulomb barrier

Kaonic Nuclear Clusters --- a New Paradigm of Particle and Nuclear Physics ---

Further Theoretical Analysis on the K−3He→Λpn Reaction for the KˉNN Bound-State Search in the J-PARC E15 Experiment

Affiliations

Elastic scattering, inelastic excitation, and 1n pick-up transfer cross sections for $^{10}$ B+ $^{120}$ Sn at energies near the Coulomb barrier

Further Theoretical Analysis on the $K^{-}^{3} He \to Λ p n$ Reaction for the $K ˉ N N$ Bound-State Search in the J-PARC E15 Experiment