Probing the pairing interaction through two-neutron transfer reactions

Journal Article · Tue Mar 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.034613· OSTI ID:21499507

Pllumbi, E ^[1]; Grasso, M; Beaumel, D; Khan, E; Margueron, J; Wiele, J van de ^[2]

---

1. Dipartimento di Fisica, University of Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa (Italy)
2. Institut de Physique Nucleaire, IN2P3-CNRS, Universite Paris-Sud, F-91406 Orsay Cedex (France)

Cross sections for (p,t) two-neutron transfer reactions are calculated in the one-step zero-range distorted-wave Born approximation for the tin isotopes {sup 124}Sn and {sup 136}Sn and for incident proton energies from 15 to 35 MeV. Microscopic quasiparticle random-phase approximation form factors are provided for the reaction calculation and phenomenological optical potentials are used in both the entrance and the exit channels. Three different surface/volume mixings of a zero-range density-dependent pairing interaction are employed in the microscopic calculations and the sensitivity of the cross sections to the different mixings is analyzed. Since absolute cross sections cannot be obtained within our model, we compare the positions of the diffraction minima and the shapes of the angular distributions. No differences are found in the position of the diffraction minima for the reaction {sup 124}Sn(p,t){sup 122}Sn. On the other side, the angular distributions obtained for the reaction {sup 136}Sn(p,t){sup 134}Sn with surface and mixed interactions differ at large angles for some values of the incident proton energy. For this reaction, we compare the ratios of the cross sections associated to the ground state and the first excited state transitions. Differences among the three different theoretical predictions are found and they are more important at the incident proton energy of 15 MeV. As a conclusion, we indicate (p,t) two-neutron transfer reactions with very neutron-rich Sn isotopes and at proton energies around 15 MeV as good experimental cases where the surface/volume mixing of the pairing interaction may be probed.

• OSTI ID: 21499507
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 83; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
APPROXIMATIONS
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BORN APPROXIMATION
CALCULATION METHODS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COHERENT SCATTERING
CROSS SECTIONS
DIFFRACTION
DIMENSIONLESS NUMBERS
DIRECT REACTIONS
DISTRIBUTION
DWBA
ELEMENTARY PARTICLES
ENERGY RANGE
EVEN-EVEN NUCLEI
FERMIONS
FORECASTING
FORM FACTORS
HADRON REACTIONS
HADRONS
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MEV RANGE
MEV RANGE 10-100
MILLISECONDS LIVING RADIOISOTOPES
NEUTRON TRANSFER
NEUTRON-RICH ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PAIRING INTERACTIONS
PARTICLE PROPERTIES
PROTON REACTIONS
PROTONS
RADIOISOTOPES
RANDOM PHASE APPROXIMATION
SCATTERING
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
TARGETS
TIN 122
TIN 124 TARGET
TIN 134
TIN 136
TIN ISOTOPES
TRANSFER REACTIONS
TRITONS