[
    {
        "id": "thesis:9286",
        "collection": "thesis",
        "collection_id": "9286",
        "cite_using_url": "https://resolver.caltech.edu/CaltechTHESIS:11232015-105123847",
        "primary_object_url": {
            "basename": "Davids_cn_1967.pdf",
            "content": "final",
            "filesize": 18019735,
            "license": "other",
            "mime_type": "application/pdf",
            "url": "/9286/1/Davids_cn_1967.pdf",
            "version": "v2.0.0"
        },
        "type": "thesis",
        "title": "An Experimental Study of a Stellar Neutron Source: \u00b9\u00b3C(\u03b1, n) \u00b9\u2076O",
        "author": [
            {
                "family_name": "Davids",
                "given_name": "Cary Nathan",
                "clpid": "Davids-C-N"
            }
        ],
        "thesis_advisor": [
            {
                "family_name": "Fowler",
                "given_name": "William A.",
                "clpid": "Fowler-W-A"
            }
        ],
        "thesis_committee": [
            {
                "family_name": "Unknown",
                "given_name": "Unknown"
            }
        ],
        "local_group": [
            {
                "literal": "div_pma"
            }
        ],
        "abstract": "<p>Described in this thesis are measurements made of the thick-target neutron yield from the reaction <sup>13</sup>C(\u03b1, n)<sup>16</sup>O.  The yield was determined for laboratory bombarding energies between 0.475 and 0.700 MeV, using a stilbene crystal neutron detector and pulse-shape discrimination to eliminate gamma rays.  Stellar temperatures between 2.5 and 4.5 x 10<sup>8</sup> <sup>o</sup>K are involved in this energy region.  From the neutron yield was extracted the astrophysical cross-section factor S(E), which was found to fit a linear function: S(E) = [(5.48 \u00b1 1.77) + (12.05 \u00b1 3.91)E] x 10<sup>5</sup> MeV-barns, center-of-mass system.  The stellar rate of the <sup>13</sup>C(\u03b1, n)<sup>16</sup>O reaction if calculated, and discussed with reference to helium burning and neutron production in the core of a giant star. </p>\r\n<p>Results are also presented of measurements carried out on the reaction <sup>9</sup>Be(\u03b1, n)<sup>12</sup>C, taken with a thin Be target.  The bombarding energy-range covered was from 0.340 to 0.680 MeV, with excitation curves for the ground- and first excited-state neutrons being reported.  Some angular distributions were also measured.  Resonances were found at bombarding energies of E<sub>LAB</sub> = 0.520 MeV (E<sub>CM</sub> = 0.360 MeV, \u0393 ~ 55 keV CM, \u03c9\u03b3 = 3.79 eV CM) and E<sub>LAB</sub> = 0.600 MeV (E<sub>CM</sub> = 0.415 MeV, \u0393 \u02c2 4 keV CM, \u03c9\u03b3 = 0.88 eV CM).  The astrophysical rate of the <sup>9</sup>Be(\u03b1, n)<sup>12</sup>C reaction due to these resonances is calculated. </p>\r\n",
        "doi": "10.7907/1S8V-K872",
        "publication_date": "1967",
        "thesis_type": "phd",
        "thesis_year": "1967"
    }
]