γ rays from muon capture in natural Ca, Fe, and Ni

Abstract

A significant improvement has been made in the identification of γ rays from muon capture in natural Ca, and to a lesser extent for Fe and Ni. For calcium, capture was observed in 44 Ca and even 42 Ca, as well as the dominant 40 Ca. The (µ − , ν) reaction was clearly observed in 40 Ca, but, as in the past, no clear identification was made in Fe and Ni. The (µ − , νn) reaction was clearly observed in all nuclei, and the γ rays observed correspond better to the (γ, p) reaction than to spectroscopic factors from the (d, 3 He) or (t, α) reactions. Some (µ − , ν2n) and other reactions have been observed at a lower yield.

Spins and Magnetic Moments ofK49andK51: Establishing thePapuga1, Bissell2, Kreim3 et al. 2013Phys. Rev. Lett.

“…+285.6 (7) 51 K 3/2 +302.5 (13) +36.6 (9) 51 K (5/2) +201.6 (9) +24.4 (6) 51 K (7/2) +151.3 (7) +18.3 (4) The magnetic moments are deduced from the A( 2 S 1/2 ) values relative to that of 39 K, for which a very precise measurement of A ref ( 2 S 1/2 ) = 230.8598601 (7) MHz and µ ref = +0.3914662(3) µ N is available from an atomic beam magnetic resonance measurement [30]. The results are presented in Table II.…”

“…The experimentally observed evolution of the 1/2 + and 3/2 + levels is now established up to 51 K. Different effective interactions predict very different energy gaps between the 3/2 + and the first exited 1/2 + level in 51 K. Along with the current results, spectroscopy of the excited states in 51 K is required to further improve the effective interactions in this region. [20,22,[39][40][41] compared with calculated levels (SDPF-NR,SDPF-U and SDPF-MU interactions; details in text). 3/2 + levels are solid black lines and 1/2 + dashed red.…”

Characterization of a Continuous Muon Source for the Non-Destructive and Depth-Selective Elemental Composition Analysis by Muon Induced X- and Gamma-rays

“…The timing resolution of this setup was ∼50 ns and ∼20 ns at 200 keV and 1 MeV, respectively. The energy and efficiency calibrations for this detector setup was done using the standard radioactive sources of 152 Eu, 88 Y, 60 Co and 137 Cs. The target consisted of a three-layered sandwich sample of iron (Fe), titanium (Ti), and copper (Cu) plates and was placed in vacuum.…”

Statistical Neutron Emission Model for Neutrino Nuclear Response

“…The ß + strengths are obtained by measuring prompt [6] and delayed gamma rays [9][10][11] from (μ,xn) reactions with x being the number of the emitted neutrons. So far nuclear gamma rays from MCR were measured to study the nuclear reaction mechanisms [3,4]. The prompt gamma rays originating from bound states are excited byμcapture help the probing of ß + responses at low lying bound states [6,9].…”

“…The neutron emission spectrum by the Time-of-Flight (TOF) measurement [4] [13], shows that the maximum neutron energy are less than 30 MeV and there are small percentage of slow neutrons emitted at higher than 30 MeV range. The ratio of fast neutron to slow neutron are unknown but it was expected to be in the range of 12% to 30%.…”