Three-body Photodisintegration of 3He Measured with CLAS PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Three-body Photodisintegration of 3He Measured with CLAS PDF full book. Access full book title Three-body Photodisintegration of 3He Measured with CLAS by Silvia Niccolai. Download full books in PDF and EPUB format.
Author: Silvia Niccolai
Publisher:
ISBN:
Category :
Languages : en
Pages : 446
Get Book Here
Book Description
Author: Silvia Niccolai
Publisher:
ISBN:
Category :
Languages : en
Pages : 446
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Get Book Here
Book Description
The three-body photodisintegration of 3He has been measured with the CLAS detector at Jefferson Lab, using tagged photons of energies between 0.35 GeV and 1.55 GeV. The large acceptance of the spectrometer allowed us for the first time to cover a wide momentum and angular range for the two outgoing protons. Three kinematic regions dominated by either two- or three-body contributions have been distinguished and analyzed. The measured cross sections have been compared with results of a theoretical model, which, in certain kinematic ranges, have been found to be in reasonable agreement with the data.
![Photodisintegration of 3H and 3He. [Threshold to 25 MeV]. PDF](https://books.google.com/books/content/images/frontcover/fk9oAQAACAAJ?fife=w80-h100)
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The photoneutron cross sections for 3H and 3He have been measured from threshold to approx. 25 MeV with monoenergetic photons from the annihilation in flight of fast positrons at the LLL Electron-Positron Linear Accelerator facility. These reactions include the two-body breakup of 3H and the three-body breakup of both 3H and 3He; these measurements for 3H are the first to span the energy region across the peaks of the cross sections. An efficient BF3-tube-and-paraffin neutron detector and high-pressure gaseous samples of several moles each (the activity of the 3H sample was approx. 200,000 Ci) were employed in these measurements. Measurements on 16O and 2H also were performed to verify the absolute cross-section scale. The results, when compared with each other and with results for the two-body breakup cross section for 3He from the literature, show that the two-body breakup cross sections for 3H and 3He have nearly the same shape, but the one for 3He lies lower in magnitude; the three-body breakup cross section for 3He lies higher in magnitude and is broader in the peak region and also rises less sharply from threshold than that for 3H; and these measured differences between the cross sections for the breakup modes largely compensate in their sum, so that the total photon absorption cross sections for 3H and 3He are nearly the same in both size and shape at energies near and above their peaks. Theoretical results from the literature disagree with the experimental results to a certain extent over the entire photon-energy region for which the photoneutron cross sections were measured. 50 figures, 7 tables.
![Measurements of the two-body photodisintegration of 3He [He] in the D [Delta] (1236) resonance region PDF](https://books.google.com/books/content/images/frontcover/xz5ZtwAACAAJ?fife=w80-h100)
Author: Physikalisches Institut (Bonn)
Publisher:
ISBN:
Category :
Languages : de
Pages : 14
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 784
Get Book Here
Book Description
Author: Martin Karlsson
Publisher:
ISBN: 9789162863852
Category :
Languages : en
Pages : 135
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 254
Get Book Here
Book Description
We have measured the three-body photobreakup of 3He with the tagged photon beam and the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility, in the photon energy range between 0.35 GeV and 1.55 GeV. This measurement constitutes a wide-ranging survey of two- and three-body processes in the gamma3He → ppn reaction channel, thanks to the high statistics and large kinematic coverage obtained with the CLAS. Total and partially integrated differential cross sections for the full ppn data set and for selected kinematics were extracted and are compared to theoretical predictions of Laget (up to 1.0 GeV). At low photon energies, the calculations are generally in fair agreement with the data. The comparison shows evidence of strong contributions of three-body absorption mechanisms, especially in the star kinematics, a symmetric configuration of the three final-state nucleons. Mostly the effects of two-body absorption mechanisms are se en, as expected, in the pp-pair-breakup kinematics, where the neutron does not participate in the reaction. The quasi-two-body breakup shows angular distributions consistent with preliminary gamma3He → pd results, extracted from our experiment. The ratio of cross sections for the star configuration and for the two-body kinematics, shows a maximum for three-body effects at a photon energy of about 0.5 GeV, corresponding to a reduced photon wavelength of 0.4 fm. The 4pi-integrated cross section is in excellent agreement with previous experimental results from DAPHNE up to 800 MeV; no previous results have been obtained above this energy.
Author: Silvia Niccolai
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
We have measured the three-body photobreakup of {sup 3}He with the tagged photon beam and the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility, in the photon energy range between 0.35 GeV and 1.55 GeV. This measurement constitutes a wide-ranging survey of two- and three-body processes in the gamma{sup 3}He {yields} ppn reaction channel, thanks to the high statistics and large kinematic coverage obtained with the CLAS. Total and partially integrated differential cross sections for the full ppn data set and for selected kinematics were extracted and are compared to theoretical predictions of Laget (up to 1.0 GeV). At low photon energies, the calculations are generally in fair agreement with the data. The comparison shows evidence of strong contributions of three-body absorption mechanisms, especially in the star kinematics, a symmetric configuration of the three final-state nucleons. Mostly the effects of two-body absorption mechanisms are se en, as expected, in the pp-pair-breakup kinematics, where the neutron does not participate in the reaction. The quasi-two-body breakup shows angular distributions consistent with preliminary gamma{sup 3}He --> pd results, extracted from our experiment. The ratio of cross sections for the star configuration and for the two-body kinematics, shows a maximum for three-body effects at a photon energy of about 0.5 GeV, corresponding to a reduced photon wavelength of 0.4 fm. The 4pi-integrated cross section is in excellent agreement with previous experimental results from DAPHNE up to 800 MeV; no previous results have been obtained above this energy.
Author: Takaharu Otsuka
Publisher: World Scientific
ISBN: 9814548138
Category :
Languages : en
Pages : 406
Get Book Here
Book Description
This is the proceedings of the symposium on Frontiers of Nuclear Structure Physics which was held from March 2-5, 1994, in honor of Akito Arima. Nuclear structure physics is approaching a new era owing to various recent developments such as radioactive nuclear beams, multiple gamma-ray detectors, massive parallel computers, etc. In the near future RHIC, CEBAF and other facilities will further extend the horizons of the field and this meeting offered a look at these exciting possibilities ahead. Topics discussed included (i) new trends in shell model, (ii) electroweak interactions in nuclei, (iii) unstable nuclei, (iv) Interacting Boson Model, (v) proton-neutron degrees of freedom in nuclear collectivity, (vi) quarks in hadrons and nuclei, (vii) nuclear astrophysics, (viii) nuclear and atomic clusters.
Author: National Science Foundation (U.S.)
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 476
Get Book Here
Book Description
