Investigation of short-lived PT and PB {alpha} emitters near the proton drip line

Conference · Fri Nov 01 04:00:00 EST 1996

OSTI ID:406065

Bingham, C R; Wauters, J; Zimmerman, B E ^[1]

---

1. Tennessee Univ., Knoxville, TN (United States); and others

In a series of experiments at the Argonne ATLAS Accelerator Facility, several {alpha} emitters near the proton drip line were produced with fusion evaporation reactions, separated from the beam and dispersed in M/Q with a recoil mass spectrometer, and implanted and studied in a double-sided silicon strip detector. In {sup 78}Kr bombardments of {sup 92}Mo and {sup 96}Ru, the new isotopes {sup 166}Pt and {sup 167}Pt were identified via their {alpha}-decay properties and more accurate half-lives were measured for {sup 169}Pt and {sup 170}Pt. The light isotopes of lead, {sup 180}Pb, {sup 182}Pb, and {sup 184}Pb were produced in Mo bombardments of Zr target nuclei. The {alpha}-decay energies and half-lives of the new isotopes are as follows: (1) {sup 166}Pt, E{sub {alpha}} = 7110(15) keV, T{sub 1/2} = 0.3(1) ms; and (2) {sup 167}Pt, E{sub {alpha}} = 6988(10) keV, T{sub 1/2} = 0. 7(2) ms. Also, the half-life of {sup 168}Pt, which was previously unknown, was determined to be 2.0(4) ms and that of {sup 170}Pt was observed to be 14.7(5) ms. The tentative {alpha}-decay energies and half-lives of the even Pb isotopes are: (1) {sup 184}Pb, E{sub {alpha}} = 6625(10) keV, T{sub 1/2} =500(25) ms; (2) {sup 182}Pb, E{sub {alpha}} = 6895(10) keV, T{sub 1/2} = 62(5) ms; and (3) {sup 180}Pb, E{sub {alpha}} = 7250(15) keV, T{sub 1/2} = 5.8 {sup +2.8}{sub -1.4} ms. The a-decay rates for these Pt and Pb nuclides are compared with earlier measurements and systematic trends of the reduced widths with neutron number are discussed.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC05-96OR22464; FG02-96ER40983; FG05-88ER40418; FG05-88ER40407; FG05-84ER40159; W-31109-ENG-38
• OSTI ID: 406065
• Report Number(s): CONF-961110--7; ON: DE97000321
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALPHA DECAY
HALF-LIFE
HEAVY ION REACTIONS
KRYPTON 78
LEAD 180
LEAD 182
LEAD 184
MOLYBDENUM 92 REACTIONS
MOLYBDENUM 92 TARGET
PLATINUM 168
PLATINUM 170
PLATINUM ISOTOPES
RUTHENIUM 96 TARGET
ZIRCONIUM 90 TARGET