Study of compression modes in 56Ni using an active targetBagchi, S., 2015, [Groningen]: University of Groningen. 134 p.
Research output: Thesis › Thesis fully internal (DIV) › Academic
The Isoscalar Giant Monopole Resonance and the Isoscalar Giant Dipole Resonance are important in studying the nuclear incompressibility in finite nuclei. Nuclear incompressibility is a key input to the equation of state of nuclear matter which is in turn useful in understanding some astrophysical phenomena such as masses of neutron stars and supernovae explosions. Because Nickel-56 is unstable, we performed the experiment in inverse kinematics. However, performing experiments with exotic beams is still a challenge, as beams of exotic nuclei have relatively low intensities. Hence, to get a reasonable yield, a thick target is needed. This, however, degrades the energy resolution and very low-energy particles will not come out of the target. A good alternative is to use an active target, such as MAYA at GANIL, in which the target can itself be used for detection and its thickness can be increased without a severe loss of energy resolution. Due to low-detection threshold in MAYA, detection of very low-energy particles is also possible. Inelastic scattering of the secondary Nickel-56 beam at an energy of 50 MeV/u with helium gas occurs within the detector volume. The nucleus of helium atom (also known as alpha particle) has spin and isospin both equal to zero. Therefore, it is an ideal probe to excite isoscalar resonances. The tracks of the low-energy recoil alpha particles have been measured, yielding their scattering angles, ranges and energies which then lead to the excitation energy of Nickel-56. In this thesis, results obtained from this analysis are shown.
|Qualification||Doctor of Philosophy|
|Place of Publication||[Groningen]|
|Publication status||Published - 2015|
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