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Total Cross Section Measurements for ³He (³He,2p) ⁴He at Low Energies


Dwarakanath, Mirmira Ramarao (1969) Total Cross Section Measurements for ³He (³He,2p) ⁴He at Low Energies. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/NX19-PN03.


Precise measurements of the total reaction cross section for 3He(3He,2p)4He He have been made in the range of center-of-mass energies between 1100 keV and 80 keV. A differentially pumped gas target modified to operate with a limited quantity of the target gas was employed to minimize the uncertainties in the primary energy and energy straggle. Beam integration inside the target gas was carried out by a calorimetric device which measures the total energy spent in a heat sink rather than the total charge in a Faraday cup. Proton energy spectra have been obtained using a counter telescope consisting of a gas proportional counter and a surface barrier detector and angular distributions of these protons have been measured at seven bombarding energies. Cross section factors, S(E), have been calculated from the total cross sections and fitted to a linear function of energy over different ranges of energy. For Ecm < 500 keV

S(Ecm) = S0 + S1 Ecm

where S0 = (5.0 +0.6-0.4) MeV - barns and S1 = (-1.8 ± 0.5) barns.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Fowler, William A.
Thesis Committee:
  • Unknown, Unknown
Defense Date:25 May 1968
Funding AgencyGrant Number
Office of Naval ResearchUNSPECIFIED
Record Number:CaltechTHESIS:10282015-092157211
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9253
Deposited By: Benjamin Perez
Deposited On:28 Oct 2015 17:53
Last Modified:26 Apr 2024 23:08

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