1987 Fiscal Year Final Research Report Summary
Study of Charmed and Beauty Particie Decays in High Enersy Hadronic Interactions
| Project/Area Number |
60460019
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
核・宇宙線・素粒子
|
|---|
| Research Institution | Osaka City University |
|---|
Principal Investigator |
TERANAKA Masahiko Assciate Professor Faculty of Science, Osaka City University, 理学部, 助教授 (50046934)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
OKABE Hisataka Chief Researcher Osaka Prefecture Institute of Scientific Education, 主任研究員 (10132945)
OKUSAWA Tohru Lecturer Faculty of Science, Osaka City University, 理学部, 講師 (60047397)
KUSUMOTO Osamu Professor Faculty of Science, Osaka City University, 理学部, 教授 (00046749)
|
|---|
| Project Period (FY) |
1985 – 1987
|
| Keywords | Decay Time / 重いフレーバー |
|---|
| Research Abstract |
Two exposure runs of nuclear photographic emuision were carried out at Fermi National Accerelator Laboratory. Emulsion target were combined with electronic counter spectrometer The development of emuision and the data aquisition were finished.
The present results are obtained from these experiments as follows.
RUN 1 Emulsion stacks of 30 iitres were exposed to 800 GeV proton beams, and 5.4x10^66 events of proton-nucleus interactions were recorded in MT by means of much triggering. These events are selected by the impact distances betweed primary interaction vertex and track of triggering muon and/or hadron track associated with decay event. In presnt stage, about 120 events with Charm decay candidates are found in the seiected interactions. The ratio of the candidates rate to the selected one is 1/25. The finding candidates becomes about 50 events per one month through the developements of measuring equipmemt and computer programing. After about one half year, it is possible to anaiyse the pair production mechanism os Charmed particles.
RUN 2 Emuision stacks of 47 litres were exposed to 650 GeV negative pion beams, and 9.6x10^66 events were recorded by means of muon triggering.
In order to obtain higher quality of counter data, the following points were made better than RUN 1: One layer of couters and thickness of Fe absorber added into muon triggering eqipment. In the silicon solid detector, the accuracy of position detemination increased as two times. The emulsion tape, which moves rapidly to beam, was used for high scanning eficiency of candidate detection.
It is expected to find considerable number of Beauty particle decays from scanning in RUN 1 and 2.
|
