Energy levels of 56Ni and 60Zn from (3He, n) reactions

Winsborrow, R.P.J.; Macefield, B.E.F.

doi:10.1016/0375-9474(72)90529-5

Cited by 23 publications

(7 citation statements)

References 29 publications

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“…Measurements, including those of Greenfield et al (1972), Pougheon et al (1972), Winsborrow & Macefield (1972), Evers et al (1974), Alford et al (1975), Weber et al (1979), Schubank et al (1989), Boucenna et al (1990), de Angelis et al (1998), andSvensson et al (1999), have found numerous 60 Zn levels above the proton threshold (S p = 5105 keV) (Wang et al 2021). Based on the latest information, we have done a careful reassessment of the excitation energies derived from nucleon transfer reactions.…”

Section: Energy Levelsmentioning

confidence: 99%

“…Based on the latest information, we have done a careful reassessment of the excitation energies derived from nucleon transfer reactions. These include 58 Ni( 3 He,n) 60 Zn (Greenfield et al 1972;Winsborrow & Macefield 1972;Evers et al 1974;Alford et al 1975), 58 Ni( 12 C, 10 Be) 60 Zn (Weber et al 1979;Boucenna et al 1990), and 58 Ni( 16 O, 14 C) 60 Zn (Pougheon et al 1972).…”

Section: Energy Levelsmentioning

confidence: 99%

“…The adjustments are mostly higher than 10 keV and agree with the uncertainties presented in each paper. Winsborrow & Macefield (1972) ( 58 Ni( 3 He,n) 60 Zn) reported energy levels with large uncertainties, approximately 0.2 MeV for each energy level. Two of the adjusted energy levels, E x = 6.886 and 7.476 MeV, have approximately the same values as the levels of E x = 6.923 and 7.469 MeV measured by Boucenna et al (1990) andde Angelis et al (1998), respectively.…”

Section: Energy Levelsmentioning

confidence: 99%

“…The spin parities of the states in 60 Zn have also been studied in the previous measurements, mostly focusing on low-lying states (Greenfield et al 1972;Pougheon et al 1972;Winsborrow & Macefield 1972;Evers et al 1974;Kamermans et al 1974;Alford et al 1975;Weber et al 1979;Schubank et al 1989;Boucenna et al 1990;de Angelis et al 1998;Svensson et al 1999;Mazzocchi et al 2001). For high energy states above the proton threshold, only a few studies have been conducted on each energy state, but there are frequent discrepancies in those measurements.…”

Section: Spinsmentioning

confidence: 99%

“…In this study, the strength of the NiCu cycle in the temperature range relevant to XRBs was estimated using experimental data from previous measurements. The nuclear properties of the compound nucleus 60 Zn were assessed using the published data (Greenfield et al 1972;Pougheon et al 1972;Winsborrow & Macefield 1972;Evers et al 1974;Alford et al 1975;Weber et al 1979;Schubank et al 1989;Boucenna et al 1990;de Angelis et al 1998;Svensson et al 1999;Mazzocchi et al 2001). A Monte Carlo technique was implemented to determine the 59 Cu(p,α) 56 Ni and 59 Cu(p,γ) 60 Zn thermonuclear reaction rates and their uncertainties from the uncertainties of the nuclear properties.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of the NiCu Cycle Strength and Its Impact on Type I X-Ray Bursts

Kim

Chae

Cha

et al. 2022

ApJ

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Type I X-ray bursts (XRBs) are powered by thermonuclear burning on proton-rich unstable nuclides. The construction of burst models with accurate knowledge of nuclear physics is required to properly interpret burst observations. Numerous studies that have investigated the sensitivities of burst models to nuclear inputs have commonly extracted the strength of the NiCu cycle in the rp process, determined by the 59Cu(p,α)56Ni and 59Cu(p,γ)60Zn thermonuclear reaction rates, as critical in the determination of reaction flow in the burst. In this study, the strength of the cycle at the XRB temperature range was estimated based on published experimental data. The nuclear properties of the compound nucleus 60Zn were evaluated for the 59Cu(p,α)56Ni and 59Cu(p,γ)60Zn reaction rate calculations. Monte Carlo rate calculations were conducted to include the large uncertainties of nuclear properties in the calculations. In the current work, a weak NiCu cycle is expected, whereas the rates adopted by the previous studies suggest a strong NiCu cycle. Model simulations were performed with the new rates to assess the impact on Type I XRBs. The results show that the estimated cycle strength does not strongly influence the model predictions of the burst light curve or synthesized abundances.

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Section: Energy Levelsmentioning

confidence: 99%

Section: Energy Levelsmentioning

confidence: 99%

Section: Energy Levelsmentioning

confidence: 99%

Section: Spinsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Estimation of the NiCu Cycle Strength and Its Impact on Type I X-Ray Bursts

Kim

Chae

Cha

et al. 2022

ApJ

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Investigation of gamma-ray transitions in56Ni

1975

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Abstract. Angular correlation measurements for the S4Fe(3He, n 7)S6Ni reaction were performed at E~He = 12.5 MeV. Method II of Litherland and Ferguson was used to determine the multipole mixing ratio of the 7-radiation and the spins of the excited levels at 3925 and'3956 keV. As the most probable spin assignments we deduced 4 + (3925 keV) and 0* (1, 2) (3956keV). The mixing ratio found for the 1225 keV transition from 4 + ~2 + is (5(M3/E2)= +0.21 +0.23 -0.16" This result is compared with a shell model calculation. !. IntroductionThe nucleus 5~, 9 28N128 has mainly been investigated by the (p,t) reaction on SSNi [1,2] and the (3He, n) reaction on 54Fe [-3-5]. For both reactions the experimental results concerning spin values and parities of the excited states agree in most cases. Exceptions have been found in the excitation region of 3.95, 5.4 and 6.4 MeV. For the excitation region of 3.95 MeV a spin value J==4 + resulted from the triton angular distributions and a spin value of J"= 0 + from the neutron angular distributions. In a former study [6] we found, that there exist two levels at 3925 and 3956 keV in this excitation region. In order to get some information about the spins of these levels we measured the gammaray angular distributions for the transitions from these levels to the first excited state at 2700 keV. !1. Experimental Procedure and Evaluation of DataThe 54Fe(3He, n)56Ni reaction was used to populate the 5~states. The 3He-beam of 12.5 MeV was supplied by the EN-Tandem Van de Graaff accelerator from the Max-Planck-Institut ftir Kernphysik, Heidelberg. The 3He-ions bombarded electroplated selfsupporting S4Fe-targets (2 mg/cm 2, 96~o S~Fe). Gamma-rays were detected in a Ge(Li) detector with an active volume of about 45 cm 3. The neutron detection system consisted of a 10.2 cmQ x 7.5 cm NE 213 liquid scintillator coupled to an XP 1041 photomultiplier tube which was followed by a standard pulse-shape discrimination circuit. We further used a time of flight selection, start and stop signals for the time of flight spectrum being given by the neutron and the Ge(Li) detector respectively. The neutron detector was placed at 0 ~ with respect to the beam axis while the Ge(Li) detector was positioned at five different angles between 0~. = 90 ~ and 0~, = 150 ~ The gamma-ray angular distribution measurement was supplemented by a Jz-7 coincidence experiment, for which the neutron detector was fixed at 0,=30 ~ to the beam axis. Every run (including five angles) was started with a new target, At the end of every run the target activity amounted to 25~o of the single counting rate. Changing the target with every run should not influence the angular distribution, because differences between targets, such as thickness and degree of oxidation, should have influenced all five angles in the same way. Even the relative intensities of the peaks should not be touched by the change of the targets, as the particles have a mean energy loss of about 0.5 MeV, and therefore the cross section is averaged over a wide range of energy...

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