Production cross sections of {sub 105}{sup 261}Ha from the {sup 250}Cf({sup 15}N,4n) and {sup 243}Am({sup 22}Ne,4n) reactions

Journal Article · Tue Dec 01 00:00:00 EST 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.58.3413· OSTI ID:670249

Lane, M R; Gregorich, K E; Lee, D M; Wierczinski, B; McGrath, C A; Hendricks, M B; Shaughnessy, D A; Strellis, D A; Sylwester, E R; Wilk, P A; Hoffman, D C ^[1]

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1. Nuclear Science Division, Lawrence Berkeley National Laboratory, MS 70A-3307, Berkeley, California 94720 (United States)

We have measured the production cross section of 1.8-s {sup 261}Ha from two different reactions. It was produced in the {sup 250}Cf({sup 15}N,4n) reaction at 84 MeV and in the {sup 243}Am({sup 22}Ne,4n) reaction at 116 MeV. Our rotating wheel system with a special parent-daughter stepping mode was used to detect {alpha}-{alpha} correlations between {sup 261}Ha and {sup 257}Lr. We measured 13 and 9 correlations in the two reactions, respectively. Assuming a 100{percent} {alpha} branch, we have determined the production cross section of {sup 261}Ha to be 0.51{plus_minus}0.20thinspnb in the {sup 250}Cf({sup 15}N,4n) reaction at 84 MeV, and 0.25{plus_minus}0.11thinspnb in the {sup 243}Am({sup 22}Ne,4n) reaction at 116 MeV. Based on the number of fission events observed in the latter reaction, we have been able to set an upper limit of 18{percent} for the spontaneous fission branch of {sup 261}Ha. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 670249
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 58; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALPHA DECAY
AMERICIUM 243 TARGET
CALIFORNIUM 250 TARGET
CROSS SECTIONS
HEAVY NUCLEI
LAWRENCE BERKELEY LABORATORY
LAWRENCIUM 257
MEV RANGE 10-100
MEV RANGE 100-1000
NEON 22
NUCLEAR DECAY
SPONTANEOUS FISSION