Pairing correlations in 206Pb+ 118Sn transfer reactions

doctoral thesis

• Title (english): Korelacije sparivanja nukleona u reakcijama prijenosa 206Pb+ 118Sn
• Author: Josipa Diklić
• Mentor: Suzana Szilner (mentor)
• Committee member: Matko Milin (predsjednik povjerenstva)
• Committee member: Tamara Nikšić (član povjerenstva)
• Committee member: Suzana Szilner (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2024-02-09, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics
• Universal decimal classification (UDC): 53 - Physics

Abstract

The 206Pb+ 118Sn reaction was measured by employing the new generation spectrometer PRISMA which makes it possible to measure the heavy-ion transfer reaction with high efficiency and good ion identification even at very low bombing energies. The measurements have been performed at the INFN-LNL accelerator complex, by using the heavy 206Pb ion beam, at three different bombarding energies and by detecting the lighter reaction fragments in PRISMA at different angles and magnetic settings. The most important results of this experiment can be categorized into two main groups. The study of the dynamics, where at the highest measured energy the transition from quasi-elastic to deep inelastic regimes was followed. The second group of results concerns the search for the signatures of the nucleon-nucleon correlations. The dynamics was studied through the behavior of the differential and total cross sections, the energy distributions for different transfer channels, and their comparison with the theoretical calculations. In particular, from the dependence of the Q-value distributions on the scattering angle, the evolution from the quasi-elastic to the deep inelastic regime was evidenced. Nucleon-nucleon correlations were studied by the construction of the transfer probabilities as a function of the distances of the closest approach. The probabilities of different one-nucleon transfer channels have been compared with those of the two-nucleon transfers. By comparing their absolute values the enhancement factors have been extracted. The results were also compared with the GRAZING code calculations.

Abstract (croatian)

Reakcije koje proučavamo u ovom doktoratu nazivaju se reakcijama prijenosa mnogo nukleona (MNT). One uključujući razmjenu jednog, dva ili više nukleona između jezgre projektila i jezgre mete. MNT reakcije nalaze se između kvazi-elastičnog i duboko neelastičnog režima, u smislu trajanja reakcije, gubitka kinetičke energije i broja razmijenjenih cestica. Ovakve reakcije posebno su zanimljive iz dva razloga. Prvi razlog je zato što ove reakcije pružaju uvid u dinamiku same reakcije i kako se ona razvija od kvazi-elastičnog do duboko neelastičnog režima. Drugi razlog je mogućnost istovremenog promatranja raznih kanala prijenosa nukleona, što nam daje mogućnost proučavanja korelacije među nukleonima. Upravo su za te dvije teme vezani i glavni rezultati ovog doktorata. Sustav koji je promatran u ovom doktoratu je 206Pb+118Sn. Takav sustav ima otvorene kanale ogoljavanja i pobiranja neutrona, kao i ogoljavanja i pobiranje protona s dodatnim prijenosima neutrona na višim energijama. Zbog toga je dobar kandidat za proučavanje kako dinamike reakcije tako i korelacija među nukleonima. Za identifikaciju produkata reakcije korišten je magnetski spektrometar PRISMA na postrojenju INFN-LNL u Italiji. PRISMA je namještena da detektira lakše partnere u reakciji (produkte reakcije sličnih meti). Eksperiment je rađen na tri energije snopa (E_lab = 1200 MeV, 1090 MeV i 1035 MeV), od iznad barijere do ispod nje, a PRISMA je postavljen na dva različita kuta detekcije (θ_lab = 35° i 25°) kako bi se proučavale široke kutne raspodjele. Sama PRISMA ima kutnu prihvatljivost od oko 10°, što nam je omogućilo da na energiji poviše barijere (1200 MeV) promatramo razvoj reakcije na širokom rasponu kuteva od 20°. Tri različite energije snopa, a posebno najniža energija omogućili su nam da promatramo korelacije među neutronima.

• Keywords: the 206Pb+ 118Sn system; heavy-ion collisions; multinucleon transfer reactions; magnetic spectrometer; nucleon-nucleon correlations; differential and total cross sections
• Keywords (english): Rad ne sadrži ključne riječi na drugom jeziku.
• Language: english
• URN:NBN: urn:nbn:hr:217:823040
• Promotion: 2024
• Project: Number: IP-2018-01-1257; Title: Zemljovid atomskih jezgara - neutronski bogata strana; Acronym: NeRiS-Land; Leader: Suzana Szilner; Jurisdiction: Croatia; Funder: Hrvatska zaklada za znanost; Funding stream: Research Projects
• Study programme: Title: Doctoral study; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti u području prirodnih znanosti (doktor/doktorica znanosti u području prirodnih znanosti)
• Type of resource: Text
• Extent: 144 str.
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2024-09-09
• Created on: 2024-05-23 13:03:01