June 29, 2015 to July 3, 2015
Europe/Rome timezone

The nuclear contact: From nucleus photodisintegration to nucleons momentum distributions

Jun 30, 2015, 6:00 PM
Room PS1 (Building E, Polo Fibonacci, Pisa)

Room PS1

Building E, Polo Fibonacci, Pisa

Talk Few-Body Physics Working Group Parallel Session 4 - Few-Body Physics WG


Betzalel Bazak (Racah Institute of Physics, The Hebrew University of Jerusalem)


Recently, Tan suggested that the properties of universal quantum gases depend on a new characteristic quantity, called the contact. The contact describes the probability of two particles coming close to each other, i.e. it is a measure of the number of close particle pairs in the system. Utilizing the contact, this theory predicts the energy, pressure and other properties of the system. It was proven right in a series of ultracold atomic experiments. We generalize Tan's contact to nuclear systems, introducing the various nuclear contacts, taking into account all possible pair configurations. The leading neutron-proton contact is then evaluated from medium energy photodisintegration experiments. To this end, the Levinger quasi-deuteron model of nuclear photodisintegration is reformulated, and the bridge between the Levinger constant and the contact is established. Using experimental evaluations of Levinger's constant the value of the neutron-proton contact in finite nuclei and in symmetric nuclear matter is extracted, and compared to the universal theory. Utilizing the contact, a new asymptotic connection between the one-nucleon and two-nucleon momentum distributions, describing the two-body short-range correlations in nuclei, is obtained. Using available numerical data, we extract few connections between the different contacts and verify their relations to the momentum distributions.

Primary author

Betzalel Bazak (Racah Institute of Physics, The Hebrew University of Jerusalem)


Prof. Nir Barnea (Racah institute of Physics, The Hebrew University) Mr Ronen Weiss (Racah institute of Physics, The Hebrew University)

Presentation materials