J. D. Sherman

A study of 64Cu, 66Cu, 68Cu and 70Cu by (t, 3He) reactions

Abstract Levels in 64,66,68,70 Cu that are populated in the 64,66,68,70 Zn (t, 3 He) reactions at 24 MeV triton energy have been studied. Mass excesses for the lowest states observed in 68 Cu and 70 Cu are found to be −65576±20 keV and −62982±20 keV, respectively. A multiplet of states, populated with large intensities, is observed to move systematically towards decreasing excitation energy as the neutron number approaches 40. It is concluded that this multiplet has a π p 3 2 ν g 9 2 configuration.

Possible hexadecapole vibrations in 190, 192Os

Abstract The low-lying level structures of 190 Os and 192 Os have been investigated by the (t, α) proton pick-up reaction with 15 MeV tritons. In both nuclides this reaction strongly excites the I , K π = 4,4 + levels which were previously interpreted as two-phonon γ-vibrational states. The large two-quasiproton amplitude which seens to be implied by these results is inconsistent with the two-phonon description. However, the cross sections for these states are correctly predicted when the levels are assumed to be hexadecapole vibrations.

Structure of 88Kr derived from the 86Kr(t, p)88Kr reaction

Abstract The 86Kr(t, p)88Kr has been used to measure the previously unknown 88Kr level spectrum. Comparison of the proton angular distributions to DWBA predictions leads to Jπ assignments for many observed levels.

Analyzing Power for the 90Zr(% MathType!MTEF!2!1!+-% feaagCart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaacbaGab8hDay% aalaaaaa!3704!,α)89Y and 206,208pb(% MathType!MTEF!2!1!+-% feaagCart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaacbaGab8hDay% aalaaaaa!3704!,α)205,207Tℓ Reactions at 17 MeV

Recent installation of a polarized triton source1) at the Los Alamos Scientific Laboratory’s Van de Graaff accelerator has permitted the measvrement of the total spin value of proton hole states by means of the (,α) reaction. This study has been carried out on targets of 90Zr, 206pb, and 208Pb using a 17 MeV beam of polarized tritons with an intensity of 30–50 nA on target. the reaction products were detected in a Q3D spectrometer using a one-meter-long helical proportional chamber in the focal plane.2) The energy resolution of these experiments was 60 keV for the 90Zr case (a 500 μg/cm2 target), 20 keV for 206Pb (150 μg/cm2), and 18 keV for 208Pb (125 μg/cm2). The Q3D was operated at a solid angle of 14.2 msr, which resulted in exposure times of ~ 10 min. per angle for the 90Zr target to ~ 1 hour for the 206Pb target. Results at 10 angles were obtained for the 90Zr and 208Pb targets, and at four angles for the 206Pb target.