The force, power and energy of the 100-meter sprint (2009)
At the 2008 Summer Olympics in Beijing, Jamaican athlete Usain Bolt broke the world record for the 100 m sprint. Just one year later, at the 2009 World Championships in Athletics in Berlin he broke...
Universality of super Borromean four and five-body systems (2009)
Yamashita, M. T., Fedorov, D. V., Jensen, A. S.
We compute binding energies and root mean square radii for weakly bound N=4 and 5 identical bosons. Ground and first excited states appear below the threshold for binding the system with N-1...
Neutron$-^{19}$C scattering near an Efimov state (2008)
Yamashita, M. T., Frederico, T., Tomio, Lauro
The low-energy neutron$-^{19}$C scattering in a neutron-neutron-core model is studied with large scattering lengths near the conditions for the appearance of an Efimov state. We show that the real...
Trajectory of virtual, bound and resonant Efimov states (2007)
Yamashita, M. T., Frederico, T., Tomio, L.
The pole trajectory of Efimov states for a three-body $\alpha\alpha\beta$ system with $\alpha\alpha$ unbound and $\alpha\beta$ bound is calculated using a zero-range Dirac-$\delta$ potential. It is...
Comment on "Efimov States and their Fano Resonances in a Neutron-Rich Nucleus" (2007)
Yamashita, M. T., Frederico, T., Tomio, L.
By introducing a mass asymmetry in a non-Borromean three-body system, without changing the energy relations, the virtual state pole cannot move from the negative real axis of the complex energy plane...
Trajectory of neutron$-$neutron$-^{18}C$ excited three-body state (2007)
Yamashita, M. T., Frederico, T., Tomio, Lauro
The trajectory of the first excited Efimov state is investigated by using a renormalized zero-range three-body model for a system with two bound and one virtual two-body subsystems. The approach is...
Three-boson recombination at ultralow temperatures (2006)
Yamashita, M. T., Frederico, T., Tomio, Lauro
The effects of trimer continuum resonances are considered in the three-body recombination rate of a Bose system at finite energies for large and negative two-body scattering lengths ($a$). The...
Understanding the tsunami with a simple model (2006)
In this paper, we use the approximation of shallow water waves (Margaritondo G 2005 Eur. J. Phys. 26 401) to understand the behaviour of a tsunami in a variable depth. We deduce the shallow water...
Four-boson scale near a Feshbach resonance (2006)
Yamashita, M. T., Tomio, Lauro, Delfino, A., Frederico, T.
We show that an independent four-body momentum scale $\mu_{(4)}$ drives the tetramer binding energy for fixed trimer energy (or three-body scale $\mu_{(3)}$) and large scattering length ($a$). The...
Structure of exotic three-body systems (2005)
Frederico, T., Yamashita, M. T., Delfino, A., Tomio, Lauro
The classification of large halos formed by two identical particles and a core is systematically addressed according to interparticle distances. The root-mean-square distances between the...
A unified model for the long and high jump (2005)
A simple model based on the maximum energy that an athlete can produce in a small time interval is used to describe the high and long jump. Conservation of angular momentum is used to explain why an...
Neutron-neutron correlation in the halo dissociation of light exotic nuclei (2005)
Yamashita, M. T., Frederico, T., Tomio, Lauro
We present model results for the two-halo-neutron correlation functions, $C_{nn}$, for the dissociation process of light exotic nuclei modelled as two neutrons and a core. A minimum is predicted for...
A doorway to Borromean halo nuclei: the Samba configuration (2005)
Yamashita, M. T., Frederico, T., Hussein, M. S.
We exploit the possibility of new configurations in three-body halo nuclei - Samba type - (the neutron-core form a bound system) as a doorway to Borromean systems. The nuclei $^{12}$Be, $^{15}$B,...
Radii in weakly-bound light halo nuclei (2004)
Yamashita, M. T., Tomio, Lauro, Frederico, T.
A systematic study of the root-mean-square distance between the constituents of weakly-bound nuclei consisting of two halo neutrons and a core is performed using a renormalized zero-range model. The...
Triatomic continuum resonances for large negative scattering lengths (2003)
Bringas, F., Yamashita, M. T., Frederico, T.
We study triatomic systems in the regime of large negative scattering lengths which may be more favorable for the formation of condensed trimers in trapped ultracold monoatomic gases as the...
Tomio, Lauro, Filho, Victo S., Yamashita, M. T., Gammal, A., Frederico, T.
The three-body recombination coefficient of a trapped ultracold atomic system, together with the corresponding two-body scattering length $a$, allow us to predict the energy $E_3$ of the shallow...
Radii of weakly bound three-body systems: halo nuclei and molecules (2003)
Yamashita, M. T., Frederico, T., Tomio, Lauro
A renormalized three-body model with zero-range potential is used to estimate the mean-square radii of three-body halo nuclei and molecular systems. The halo nuclei ($^6$He, $^{11}$Li, $^{14}$Be and...
Scaling predictions for radii of weakly bound triatomic molecules (2003)
Yamashita, M. T., Tomio, Lauro, Frederico, T.
The mean-square radii of the molecules $^4$He$_3$, $^4$He$_2-^6$Li, $^4$He$_2-^7$Li and $^4$He$_2-^{23}$Na are calculated using a three-body model with contact interactions. They are obtained from a...
Scaling limit of virtual states of triatomic systems (2002)
Yamashita, M. T., Frederico, T., Delfino, A., Tomio, Lauro
For a system with three identical atoms, the dependence of the $s-$wave virtual state energy on the weakly bound dimer and trimer binding energies is calculated in a form of a universal scaling...
Weakly bound atomic trimers in ultracold traps (2002)
Yamashita, M. T., Frederico, T., Tomio, Lauro, Delfino, A.
The experimental three-atom recombination coefficients of the atomic states $^{23}$Na$|F=1,m_F=-1>$, $^{87}$Rb$|F=1,m_F=-1>$ and $^{85}$Rb$|F=2,m_F=-2>$, together with the corresponding two-body...