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- W940050579 abstract "A kutatomunka egy megfelelően kivalasztott magreakcio vizsgalatanak segitsegevel kivant kovetkeztetni a neutron-gazdag atommagok Coulomb-felbomlasi folyamatainak reszleteire. A Michigan-i Allami Egyetemen levő Nemzeti Szupravezető Ciklotron Laboratorium K-1200 gyorsitoja mellett kiserletet hajtottunk vegre 70 es 40 MeV/u energiaju radioaktiv 8Li nyalabbal olom es szen celtargyakon, amelyben a bombazo reszecske 7Li-re es neutronra valo felbomlasat figyeltuk meg. A 7Li fragmentumot magnessel teritettuk az erre a celra kifejlesztett iondetektor-rendszerbe, a neutronokat a repulesi-idő technikaval detektaltuk. A tobb bonyolult reszfeladat megoldasa utan minden megfigyelt bomlasra meghataroztuk a felbomlo 8Li izotop, valamint a felhasadaskor keletkezett neutron es 7Li ion impulzusat. A szen targeten vegrehajtott kiserlet lehetőve tette, hogy a Coulomb- es a nuklearis felbomlast mindket bombazo energianal az olomtargettel mert adatoknal elvalasszuk. Az eredmenyekből a 8Li Coulomb-felbomlasa hataskeresztmetszetet meghataroztuk a bomlasi energia fuggvenyeben. Az előzetes eredmenyek szerint a 8Li felbomlasi hataskeresztmetszete osszhangban van a 7Li(n,?)8Li inverz reakcio korabban kiserletileg meghatarozott hataskeresztmetszetevel. Kiserleti eredmenyeink lehetőve teszik a 8Li Coulomb-felbomlasanak utkozesi parameter szerinti vizsgalatat es a felbomlasi folyamatoknak a ket kulonboző bombazo energianal valo osszehasonlitasat. Az eredmenyek veglegesitese es publikalasa folyamatban van. | The research work focused on the details of Coulomb-breakup processes of neutron-rich nuclei by means of the investigation of a selected nuclear reaction. Experiments have been performed on lead and carbon targets with 8Li beams of 70 and 40 MeV/u energies at the K-1200 cyclotron of NSCL at Michigan State University. The breakup of 8Li ions into neutrons and 7Li ions was observed. The 7Li fragments were deflected by a sweeper magnet into a detector system. The neutrons from the breakup processes were detected by time-of-flight technique. The evaluation of the experimental data required the development of several sophisticated methods. In the analysis of the data the momenta of the incoming 8Li ion and that of both decay products, the 7Li and the neutron were determined for each detected event. The use of the data for the carbon target made it possible to separate the Coulomb and nuclear part of the decay in the case of the lead target. The cross sections for the neutron breakup of 8Li were determined as the function of the decay energy. According to the preliminary results, the breakup cross section of 8Li is in accordance with the experimentally determined cross section of the inverse reaction 7Li(n,?)8Li. The results of the measurements make it possible to investigate the Coulomb-breakup of 8Li as a function of the impact parameter and the comparison of the breakup processes at the two bombarding energy. The publications of the results are in progress." @default.
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- W940050579 date "2011-01-01" @default.
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- W940050579 title "Neutron-gazdag atommagok Coulomb-felbomlási folyamatai dinamikájának vizsgálata = Investigation of the dynamics of Coulomb-breakup of neutron-rich nuclei" @default.
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